Abstract:
An apparatus for controlling home communication receives first battery information on a first battery of an electric vehicle, receives second battery information on a second battery of a home power storage device, and receives power policy information from a power supply facility. The apparatus for controlling home communication decides available options for charging the first battery on the basis of the first battery information, the second battery information, and the power policy information. The apparatus for controlling home communication comprises a step of controlling the charging of the first battery according to the available options.

Description:
BACKGROUND 
       [0001]    The present disclosure relates to a home communication control device and an operating method thereof, and particularly, to a device and method for controlling charging or discharging of an electric vehicle and a home power storage device. 
         [0002]    In order to control global warming through the G20 and G8 countries, a smart grid solution and real-time use of an electric vehicle are suggested to reduce CO2. 
         [0003]    An electronic vehicle includes at least one electric motor using an electrical energy of a rechargeable battery. This rechargeable battery may be connected to an electric outlet in order for recharging. In general, it takes a few hours to charge a battery of an electric vehicle. During this process, a user may want to obtain several information. 
         [0004]    Moreover, electric grids may have a time interval at which an electrical demand exceeds a limitation. In order to prevent this, constructing a power plant additionally may rather disturb the reduction of CO2. Accordingly, adaptively coping with the demand of electricity by using a large capacity battery of an electric vehicle is required. 
         [0005]    For this, users, electric vehicles, and electric power supply facilities may need to exchange information. To this end, various communication techniques may be used. 
         [0006]    A wireless home area network (W-HAN), a wireless personal area network (W-PAN), and a wireless frequency transceiver perform communication through a wireless frequency in a short distance area between devices. A Zigbee transceiver may be used as an example. Zigbee is a standard protocol designed for wireless frequency communication in a short distance area. The Zigbee transceiver establishes a mesh network on the basis of IEEE 802.15.4. 
         [0007]    A wireless local area network (WLAN) transceiver performs communication through a wireless frequency between devices away from each other by more than 10 m. A Wi-Fi device may be used as an example. The Wi-Fi device follows the IEEE 802.11 standards. 
         [0008]    A power line communication (PLC) technique may be used to establish a network between devices through a power line. This technique is limited to an area of up to 100 m. 
         [0009]    A wide area network (WAN) is a communication network covering a wide area. The Transmission Control Protocol/Internet Protocol (TCP/IP), that is, a standard protocol, may be used as an example. Additionally, a CDMA or GSM network may be used as an example of a wireless broadband network. 
         [0010]    In order to adaptively cope with the demand of electricity by using a high capacity battery of an electric vehicle, demands for exchanging information between users, electric vehicles, and electric power supply facilities are emerging. 
       SUMMARY 
       [0011]    Embodiments provide a device, system, and method for adaptively coping with the demand of electricity by exchanging various information between power use subjects such as users, electric vehicles, and electric power supply facilities. 
         [0012]    In one embodiment, provided is an operating method of a home communication control device installed at home and controlling charging of an electric vehicle. The method includes: receiving first battery information on a first battery of the electric vehicle; receiving second battery information on a second battery of a home power storage device; receiving power policy information from a power supply facility; determining an available option for charging of the first battery on the basis of the first battery information, the second battery information, and the power policy information; and controlling the charging of the first battery according to the available option. 
         [0013]    In another embodiment, provided is an operating method of a home communication control device installed at home and controlling discharging of an electric vehicle. The method includes: receiving first battery information on a first battery of the electric vehicle; receiving second battery information on a second battery of a home power storage device; receiving power policy information from a power supply facility; determining an available option for discharging of the first battery on the basis of the first battery information, the second battery information, and the power policy information; and controlling the discharging of the first battery according to the available option. 
         [0014]    In further another embodiment, provided is an operating method of a home communication control device installed at home and controlling charging of a home power storage device. The method includes: receiving first battery information on a first battery of an electric vehicle; receiving second battery information on a second battery of the home power storage device; receiving power policy information from a power supply facility; determining an available option for charging of the second battery on the basis of the first battery information, the second battery information, and the power policy information; and controlling the charging of the second battery according to the available option. 
         [0015]    In still further another embodiment, provided is an operating method of a home communication control device installed at home and controlling discharging of a home power storage device. The method includes: receiving first battery information on a first battery of an electric vehicle; receiving second battery information on a second battery of the home power storage device; receiving power policy information from a power supply facility; determining an available option for discharging of the second battery on the basis of the first battery information, the second battery information, and the power policy information; and controlling the discharging of the second battery according to the available option. 
         [0016]    In still further another embodiment, provided is an operating method of a home communication control device installed at home The method includes: receiving first battery information on a first battery of an electric vehicle; receiving second battery information on a second battery of a home power storage device; receiving power policy information from a power supply facility; determining at least one recommendation power control content on the basis of the first battery information, the second battery information, and the power policy information; and controlling at least one of the first battery and the second battery according to a control content selected from the at least one recommendation power control content. 
         [0017]    In still further another embodiment, provided is an operating method of a home communication control device installed at home. The method includes: receiving scheduling information of an electric vehicle; receiving power policy information from a power supply facility; determining at least one recommendation power control content on the basis of the scheduling information of the electric vehicle and the power policy information; and controlling at least one of a first battery and a second battery according to a control content selected from the at least one recommendation power control content. 
         [0018]    The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]      FIG. 1  is a block diagram of a network topology according to an embodiment of the present invention. 
           [0020]      FIG. 2  is a block diagram illustrating an EVSE according to an embodiment of the present invention. 
           [0021]      FIG. 3  is a block diagram illustrating a home communication control device according to an embodiment of the present invention. 
           [0022]      FIG. 4  is a block diagram of an HPS according to an embodiment of the present invention. 
           [0023]      FIG. 5  is a block diagram of an UTD according to an embodiment of the present invention. 
           [0024]      FIG. 6  is a view illustrating an EV according to an embodiment of the present invention. 
           [0025]      FIG. 7  is the first part of a ladder diagram illustrating a charging method of an EV according to an embodiment of the present invention. 
           [0026]      FIG. 8  is the rear part of a ladder diagram illustrating a charging method of an EV according to an embodiment of the present invention. 
           [0027]      FIG. 9  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0028]      FIG. 10  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0029]      FIG. 11  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0030]      FIG. 12  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0031]      FIG. 13  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0032]      FIG. 14  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0033]      FIG. 15  is the first part of a ladder diagram illustrating a discharging method of an EV according to an embodiment of the present invention. 
           [0034]      FIG. 16  is the rear part of a ladder diagram illustrating a discharging method of an EV according to an embodiment of the present invention. 
           [0035]      FIG. 17  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0036]      FIG. 18  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0037]      FIG. 19  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0038]      FIG. 20  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0039]      FIG. 21  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0040]      FIG. 22  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
           [0041]      FIG. 23  is the first part of a ladder diagram illustrating a charging method of an HPS according to an embodiment of the present invention. 
           [0042]      FIG. 24  is the rear part of a ladder diagram illustrating a charging method of an HPS according to an embodiment of the present invention. 
           [0043]      FIG. 25  is the first part of a ladder diagram illustrating a discharging method of an HPS according to an embodiment of the present invention. 
           [0044]      FIG. 26  is the rear part of a ladder diagram illustrating a discharging method of an HPS according to an embodiment of the present invention. 
           [0045]      FIG. 27  is a ladder diagram illustrating a charging/discharging recommendation method according to an embodiment of the present invention. 
           [0046]      FIG. 28  is the first part of a ladder diagram illustrating a time scheduling method according to an embodiment of the present invention.  FIG. 29  is the rear part of a ladder diagram illustrating a time scheduling method according to an embodiment of the present invention. 
           [0047]      FIG. 30  is a ladder diagram illustrating an interruption information providing method according to an embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0048]    Hereinafter, a mobile terminal relating to the present invention is described in more detail with reference to the drawings. The suffixes “module” and “unit” for components used in the description below are assigned or mixed in consideration of easiness in writing the specification and, do not have distinctive meanings or roles by themselves. 
         [0049]    Especially, an electric power source in the specification represents an electric power transmitter and an electric power sink represents an electric power receiver. 
         [0050]    Then, a network topology according to an embodiment of the present invention will be described with reference to  FIG. 1 . 
         [0051]      FIG. 1  is a block diagram of a network topology according to an embodiment of the present invention. 
         [0052]    As shown in  FIG. 1 , the network topology includes an electric vehicle  100 , an electric vehicle power supply device  200 , a home communication control device  300 , a home power storage device  400 , a user terminal device  500 , and a power supply facility  600 . 
         [0053]    For convenience of description, the following abbreviations are used together. An electric vehicle is referred to as its acronym, that is, an EV. Additionally, an electric power supplying device is referred to as an EVSE, that is, the acronym of electric vehicle supply equipment. A home communication control device is referred to as an HCCS, that is, the acronym of a home communication control system. A home power storage device is referred to as an HPS, that is, the acronym of a home power storage. A user terminal device is referred to as its acronym, that is, an UTD. 
         [0054]    Then, an EVSE according to an embodiment of the present invention will be described with reference to  FIG. 2 . 
         [0055]      FIG. 2  is a block diagram illustrating an EVSE according to an embodiment of the present invention. 
         [0056]    The EVSE  200  is used to charge the EV  100  by receiving electricity from the HPS  400  and the power supply facility  600  or discharge the EV  100  by supplying the electricity of the EV  100  to the HPS  400  and the power supply facility  600 . 
         [0057]    As shown in  FIG. 2 , the EVSE  200  includes a display unit  210 , a control unit  220 , at least one communication module  230 , and a charging/discharging point  250 . The at least one communication module  230  may include at least one of a wired internet interface unit, a wireless wide area network (WWAN) transceiver, a wireless home area network (WHAN) transceiver, a power line communication (PLC) module, and a wireless local area network (WLAN) transceiver. The control unit  220  displays a charging status, a discharging status, a notification message, and a charging interruption message on the display unit  210 . The control unit  220  may communicate with the EV  100 , the HCCS  300 , the HPS  400 , the UTD  500 , and the power supply facility  600  through the at least one communication module  230 . The charging/discharging point  250  may correspond to an SAE J1772 outlet. 
         [0058]    Then, an HCCS according to an embodiment of the present invention will be described with reference to  FIG. 3 . 
         [0059]      FIG. 3  is a block diagram of an HCCS according to an embodiment of the present invention. 
         [0060]    The HCCS  300  is installed at home and includes a display unit  310 , a control unit  320 , and at least one communication module  330 . The control unit  320  displays a system status such as a processing status and a communication status on the display unit  310 . The control unit  320  may communicate with the EV  100 , the EVSE  200 , the HPS  400 , the UTD  500 , and the power supply facility  600  through the at least one communication module  330 . The control unit  320  may perform charging management, discharging management, scheduling, and price comparison. The at least one communication module  330  may include at least one of a wired internet interface unit, a WWAN transceiver, a WHAN transceiver, a PLC module, and a WLAN transceiver. 
         [0061]    Then, the HPS  400  according to an embodiment of the present invention will be described with reference to  FIG. 4 . 
         [0062]      FIG. 4  is a block diagram of an HPS according to an embodiment of the present invention. 
         [0063]    The HPS  400  includes a display unit  410 , a control unit  420 , at least one communication module  430 , and a battery  440 . The control unit  420  may communicate with the EV  100 , the EVSE  200 , the HCCS  300 , the UTD  500 , and the power supply facility  600  through the at least one communication module  430 . The control unit  420  controls charging and discharging of the battery  440 . Especially, the control unit  420  may charge the battery  440  with a power from the power supply facility  600  at an off time at which energy consumption is less and may discharge a power from the battery  440  to the power supply facility  600  at a peak time at which energy consumption is greater. Additionally, the control unit  420  discharges the power of the battery  440  into the EV  100  and charges the battery  400  with the power of the EV  100 . The at least one communication module  430  may include at least one of a wired internet interface unit, a WWAN transceiver, a WHAN transceiver, a PLC module, and a WLAN transceiver. 
         [0064]    Then, the UTD  500  according to an embodiment of the present invention will be described with reference to  FIG. 5 . 
         [0065]      FIG. 5  is a block diagram of an UTD according to an embodiment of the present invention. 
         [0066]    The UTD  500  includes a display unit  510 , a control unit  520 , and at least one communication module  530 . The control unit  520  displays information on billing, pricing, and timing on the display unit  510 . The control unit  520  may communicate with the EV  100 , the EVSE  200 , the HCCS  300 , the HPS  400 , and the power supply facility  600  through the at least one communication module  530 . The at least one communication module  530  may include at least one of a wired internet interface unit, a WWAN transceiver, a WHAN transceiver, a PLC module, and a WLAN transceiver. 
         [0067]    Then, the EV  100  according to an embodiment of the present invention will be described with reference to  FIG. 6 . 
         [0068]      FIG. 6  is a view illustrating an EV according to an embodiment of the present invention. 
         [0069]    As shown in  FIG. 6 , the EV  100  includes a measurement device  120  such as an end user measurement device (EUMD), a battery  140 , and a charging/discharging point  150 . The measurement device  120  measures a status of the battery  140 . The charging/discharging point  150  may correspond to an SAE J1772 inlet. The charging/discharging point  150  is connected to the charging/discharging point  250  by a user. 
         [0070]    Then, a method of charging an EV according to an embodiment of the present invention will be described with reference to  FIGS. 7 to 14 . 
         [0071]      FIG. 7  is the first part of a ladder diagram illustrating a charging method of an EV according to an embodiment of the present invention. 
         [0072]    If detecting the charging of the EV  100  is necessary, the HCCS  300  transmits an EV charging recommendation message to the UTD  500  in operation S 101 . At this point, the EV charging recommendation message may include information on the reason that the charging of the EV  100  is necessary. 
         [0073]    Upon the receipt of the EV charging recommendation message, the UTD  500  displays that the charging of the EV  100  is necessary in operation S 102 . Referring to  FIG. 9 , a screen displayed at this point is described. 
         [0074]      FIG. 9  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0075]    As shown in  FIG. 9 , upon the receipt of the EV charging recommendation message, the UTD  500  may display that the charging of the EV  100  is necessary and the reason for this. Additionally, the UTD  500  may display an accept button for accepting the charging recommendation of the EV  100  and a reject button for rejecting the charging recommendation of the EV  100 . 
         [0076]    When the reject button is selected, the UTD  500  transmits a charging recommendation rejection message to the HCCS  300  and a procedure for charging the EV  100  stops. 
         [0077]    When the accept button is selected, the UTD  500  transmits a charging acceptance message to the HCCS  300  and a procedure for charging the EV  100  continues. 
         [0078]    Again,  FIG. 7  is described. 
         [0079]    When the charging of the EV  100  is accepted by a user, the UTD  500  transmits an EV charging acceptance message to the HCCS  300  in operation S 103  and as shown in  FIG. 10 , displays a standby screen. 
         [0080]      FIG. 10  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0081]    As shown in  FIG. 10 , after transmitting the EV charging acceptance message to the HCCS  300 , the UTD  500  may display a standby screen including a messages such as “checking that the EV  100  is connected to the EVSE  200 ” and “wait for one moment”. 
         [0082]    Again,  FIG. 7  is described. 
         [0083]    Upon the receipt of the EV charging acceptance message from the UTD  500 , the HCCS  300  transmits an EV connection confirmation request message to the EVSE  200  to query whether the EV  100  is connected to the EVSE  200  in operation S 105 . 
         [0084]    Upon the receipt of the EV connection confirmation request message, the EVSE  200  checks whether the EV  100  is connected to the EVSE  200  and transmits an EV connection confirmation result message including information on an EV connection confirmation result to the HCCS  300  in operation S 107 . At this point, the EV connection confirmation result may include information on whether the EV  100  is connected to the EVSE  200 . 
         [0085]    Upon the receipt of the EV connection confirmation result message from the EVSE  200 , the HCCS  300  transmits an EV charging query message to the UTD  500  in operation S 109 . The EV charging query message may include information on whether the EV  100  is connected to the EVSE  200 . 
         [0086]    Upon the receipt of then EV charging query message from the HCCS  300 , the UTD  500  displays to a user a screen for querying whether to proceed to charge the EV  100  in operation  5110 . Referring to  FIG. 11 , a screen displayed at this point is described. 
         [0087]      FIG. 11  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0088]    As shown in  FIG. 11 , upon the receipt of the EV charging query message, the UTD  500  may display information on whether the EV  100  is connected to the EVSE  200  to a user in addition to the content for querying whether to proceed to charge the EV  100 . Additionally, the UTD  500  may display a confirm button for confirming EV charging and a reject button for rejecting EV charging. 
         [0089]    When the reject button is selected, the UTD  500  transmits a charging rejection message to the HCCS  300  and a procedure for charging the EV  100  stops. 
         [0090]    When the confirm button is selected, the UTD  500  transmits a charging confirmation message to the HCCS  300  and a procedure for charging the EV  100  continues. 
         [0091]    Again,  FIG. 7  is described. 
         [0092]    When the charging of the EV  100  is accepted by a user, the UTD  500  transmits an EV charging confirmation message to the HCCS  300  in operation S 111 . 
         [0093]    Upon the receipt of the EV charging confirmation message, the HCCS  300  transmits an EV battery information request message to the EVSE  200  in operation S 113 . 
         [0094]    Upon the receipt of the EV battery information request message from the HCCS  300 , the EVSE  200  collects information on the battery  140  of the EV  100  in operation S 115 . The EVSE  200  may collect information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. The information on the battery  140  of the EV  100  may include part or all of the total capacity of the battery  140 , the remaining power amount in the battery  140 , a power amount necessary for fully charging the battery  140 , a current SOC of the battery  140 , and an average cost spent for charging the battery  140 . Especially, the current SOC of the battery  140  may be expressed as a percentage. 
         [0095]    The EVSE  200  transmits an EV battery information response message to the HCCS  300  in operation S 118 . At this point, the EV battery information response message may include information on the battery  140  of the EV  100 . 
         [0096]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation S 119 . 
         [0097]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the battery  440  to the HCCS  300  in operation S 121 . At this point, the information on the battery  440  of the HPS  400  may include part or all of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0098]    Moreover, the HCCS  300  transmits a power policy request message to the power supply facility  600  in operation S 123 . 
         [0099]    Upon the receipt of the power policy request message from the HCCS  300 , the power supply facility  600  transmits a power policy response message including information on a power policy to the HCCS  300  in operation S 125 . At this point, the information on a power policy may include at least one of information on a power sale available time slot, information on a power sale price, information on a power purchase available time slot, and information on a power purchase price. The power sale available time zone is a time zone in which the power supply facility  600  is capable of selling power to the outside; the power sale price is a price at which the power supply facility  600  sells power to the outside; the power purchase available time zone is a time zone in which the power supply facility  600  is capable of purchasing power from the outside; and the power purchase price is a price at which the power supply facility  600  purchases power from the outside. 
         [0100]    The HCCS  300  determines the best available option by using the collected information in operation S 127 . At this point, the collected information may include at least one of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , and information on a power policy. 
         [0101]    At this point, since an electric power sink is defined as the EV  100 , the best available option may include a best electric power source, a best charging time slot, and a best charging amount. 
         [0102]    The HCCS  300  may determine one of the HPS  400  and the power supply facility  600  as the best electric power source. 
         [0103]    As described below, the HCCS  300  may determine a best electric power source, a best charging time slot, and a best charging amount in operation S 923  and operation S 1135 . 
         [0104]    Then, a method of charging the EV  100  according to an embodiment of the present invention will be described with reference to  FIG. 8 . 
         [0105]      FIG. 8  is the rear part of a ladder diagram illustrating a charging method of an EV according to an embodiment of the present invention. 
         [0106]    The HCCS  300  sets a power transfer connection between the EV  100  and a power source in operation S 131 . If the power source is the HPS  400 , the HCCS  300  may transmit a connection setting control message to the EV  100 , the EVSE  200 , and the HPS  400  and may then set a connection between the EV  100  and the HPS  400 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a connection setting control message to the EV  100 , the EVSE  200 , and the power supply facility  600  and may then set a connection between the EV  100  and the power supply facility  600 . At this point, the connection setting control message may include information on the above-mentioned best available option. 
         [0107]    If a connection is set between the EV  100  and the power source, the HCCS  300  transmits a charging permission request message to the UTD  500  and then requests a charging permission from the UTD  500  in operation S 135 . At this point, the charging permission request message may include part or all of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , information on a power policy of the power supply facility  600 , information on a determined power source, and information on whether the EV  100  is successfully connected to the power source. 
         [0108]    Upon the receipt of the charging permission request message from the HCCS  300 , the UTD  500  displays a screen for requesting a charging permission to a user in operation S 136 . Referring to  FIG. 12 , a screen displayed at this point is described. 
         [0109]      FIG. 12  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0110]    Upon the receipt of then EV charging permission message, the UTD  500  displays a screen as shown in  FIG. 12 . At this point, the screen may include information on a determined power source, charging costs, contents for querying how much power is charged to the EV  100 , and contents for querying a user so as to determine whether to permit the charging of the EV  100 . Additionally, the UTD  500  may display an accept button for permitting EV charging and a reject button for rejecting EV charging. 
         [0111]    When the reject button is selected, the UTD  500  transmits a charging rejection message to the HCCS  300  and a procedure for charging the EV  100  stops. 
         [0112]    When the confirm button is selected, the UTD  500  transmits a charging permission message to the HCCS  300  and a procedure for charging the EV  100  continues. 
         [0113]    When the charging of the EV  100  is accepted by a user, the UTD  500  transmits the charging permission message to the HCCS  300  in operation S 137 . At this point, the charging permission message may include information on how much power is charged to the EV  100 . 
         [0114]    Upon the receipt of the charging permission message from the UTD  500 , the HCCS  300  controls starting the charging of the EV  100  according to a permitted charging amount in the charging permission message in operation S 140 . If the power source is the HPS  400 , the HCCS  300  may transmit a charging start control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may then allow the EV  100  to be charged by using the power of the HPS  400 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a charging start control message to part or all of the EV  100 , the EVSE  200 , and the power supply facility  600  and may then allow the EV  100  to be charged by using the power of the power supply facility  600 . At this point, the charging start control message may include part or all of information on the above-mentioned best available option and information on a charging amount in the charging permission message. 
         [0115]    During the charging of the EV  100 , the UTD  500  may transmit a charging information request message to the HCCS  300  in operation S 141 . 
         [0116]    In response to the charging information request message of the UTD  500 , or periodically, or in response to satisfaction of other conditions, the HCCS  300  transmits an EV charging information request message to the EVSE  200  to request information on the charging of the EV  100  from the EVSE  200  in operation S 142 . 
         [0117]    In response to the EV charging information request message of the HCCS  300 , or periodically, or in response to satisfaction of other conditions, the EVSE  200  collects charging information on the battery  140  of the EV  100  in operation S 144 . The EVSE  200  may collect charging information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect charging information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. At this point, the charging information may include part or all of an initial SOC, a current SOC, a charge start time, an estimated charge end time, an actual charge end time, and an EV charging status. The initial SOC represents a charging degree at an initial charging of the battery  140  of the EV  100 . The current SOC represents a charging degree of the battery  140  of the EV  100 . The EV charging status may represent charging in progress or charging completion. 
         [0118]    In response to the charging information request message of the HCCS  300 , in correspondence to the reception of the charging information response message, or periodically, or in correspondence to satisfaction of other conditions, the EVSE  200  transmits a charging information response message to the HCCS  300  in operation S 146 . The charging information response message may include information on the charging of the EV  100 . At this point, the charging information may include part or all of an initial SOC, a current SOC, a charge start time, an estimated charge end time, an actual charge end time, and an EV charging status. 
         [0119]    The EVSE  200  may collect charging information by itself without transmitting a charging information request message to the EV  100 . 
         [0120]    In response to the charging information request message of the UTD  500 , in correspondence to the reception of the charging information response message of the EVSE  200 , or periodically, or in correspondence to satisfaction of other conditions, the HCCS  300  transmits a charging information notification message to the UTD  500  in operation S 147 . The charging information notification message may include information on the charging of the EV  100  and information on a permitted charging amount. At this point, the charging information may include part or all of an initial SOC, a current SOC, a charge start time, an estimated charge end time, an actual charge end time, and an EV charging status. At this point, the EV charging status may represent charging in progress. 
         [0121]    Upon the receipt of the charging information notification message, the UTD  500  displays charging information in operation S 149 . 
         [0122]      FIG. 13  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0123]    As shown in  FIG. 13 , the UTD  500  may display an initial SOC, a permitted charging amount, a current SOC, a charge start time, and an estimated charge end time. 
         [0124]    Moreover, the HCCS  300  checks whether charging is completed on the basis of a charging information response message in operation S 151 . The HCCS  300  may determine whether the charging of the EV  100  is completed on the basis of a current SOC, an actual charge end time, an estimated charge end time, and an EV charging status. 
         [0125]    When the charging is completed, the HCCS  300  controls stopping the charging of the EV  100  in operation S 153 . If the power source is the HPS  400 , the HCCS  300  may transmit a charging stop control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may stop the charging of the EV  100 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a charging stop control message to part or all of the EV  100 , the EVSE  200 , and the power supply facility  600  and may stop the charging of the EV  100 . 
         [0126]    Or, when the charging is completed, the HCCS  300  transmits a charging completion notification message to the UTD  500  in operation S 155 . The charging completion notification message may include information on the charging of the EV  100  and information on a permitted EV charging amount. At this point, the charging information may include part or all of an initial SOC, a current SOC, a charge start time, an estimated charge end time, an actual charge end time, and an EV charging status. At this point, the EV charging status may represent charging completion. 
         [0127]    Upon the receipt of the charging completion notification message, the UTD  500  displays charging completion as shown in  FIG. 12  in operation S 157 . 
         [0128]      FIG. 14  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0129]    Upon the receipt of then EV charging completion notification message, as shown in  FIG. 14 , the UTD  500  may display an EV charging status notifying that the charging of the EV  100  is completed, an initial SOC, a permitted charging amount, a current SOC, a charge start time, and an actual charge end time. 
         [0130]    Then, a method of discharging an EV according to an embodiment of the present invention will be described with reference to  FIGS. 15 to 21 . 
         [0131]      FIG. 15  is the front part of a ladder diagram illustrating a discharging method of an EV according to an embodiment of the present invention. 
         [0132]    If detecting the discharging of the EV  100  is necessary, the HCCS  300  transmits an EV discharging recommendation message to the UTD  500  in operation  5201 . At this point, the EV discharging recommendation message may include information on the reason that the discharging of the EV  100  is necessary. 
         [0133]    Upon the receipt of the EV discharging recommendation message, the UTD  500  displays that the discharging of the EV  100  is necessary in operation  5202 . Referring to  FIG. 16 , a screen displayed at this point is described. 
         [0134]      FIG. 17  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0135]    As shown in  FIG. 17 , upon the receipt of the EV discharging recommendation message, the UTD  500  may display that the discharging of the EV  100  is necessary and the reason for this. Additionally, the UTD  500  may display an accept button for accepting an EV discharging recommendation and a reject button for rejecting an EV discharging recommendation. 
         [0136]    When the reject button is selected, the UTD  500  transmits a discharging recommendation rejection message to the HCCS  300  and a procedure for discharging the EV  100  stops. 
         [0137]    When the accept button is selected, the UTD  500  transmits a discharging acceptance message to the HCCS  300  and a procedure for discharging the EV  100  continues. 
         [0138]    Again,  FIG. 15  is described. 
         [0139]    When the discharging of the EV  100  is accepted by a user, the UTD  500  transmits an EV discharging acceptance message to the HCCS  300  in operation  5203  and as shown in  FIG. 18 , displays a standby screen. 
         [0140]      FIG. 18  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0141]    As shown in  FIG. 18 , after transmitting the EV discharging acceptance message to the HCCS  300 , the UTD  500  may display a standby screen including a messages such as “checking that the EV  100  is connected to the EVSE  200 ” and “wait for one moment”. 
         [0142]    Again,  FIG. 15  is described. 
         [0143]    Upon the receipt of the EV discharging acceptance message from the UTD  500 , the HCCS  300  transmits an EV connection confirmation request message to the EVSE  200  to query whether the EV  100  is connected to the EVSE  200  in operation  5205 . 
         [0144]    Upon the receipt of the EV connection confirmation request message, the EVSE  200  checks whether the EV  100  is connected to the EVSE  200  and transmits an EV connection confirmation result message including information on an EV connection confirmation result to the HCCS  300  in operation  5207 . At this point, the EV connection confirmation result may include information on whether the EV  100  is connected to the EVSE  200 . 
         [0145]    Upon the receipt of the EV connection confirmation result message from the EVSE  200 , the HCCS  300  transmits an EV discharging query message to the UTD  500  in operation  5209 . The EV discharging query message may include information on whether the EV  100  is connected to the EVSE  200 . 
         [0146]    Upon the receipt of then EV discharging query message from the HCCS  300 , the UTD  500  displays to a user a screen for querying whether to proceed to discharge the EV  100  in operation S 210 . Referring to  FIG. 19 , a screen displayed at this point is described. 
         [0147]      FIG. 19  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0148]    As shown in  FIG. 19 , upon the receipt of the EV discharging query message, the UTD  500  may display information on whether the EV  100  is connected to the EVSE  200  to a user in addition to the content for querying whether to proceed to discharge the EV  100 . Additionally, the UTD  500  may display an accept button for confirming EV discharging and a reject button for rejecting EV discharging. 
         [0149]    When the reject button is selected, the UTD  500  transmits a discharging recommendation rejection message to the HCCS  300  and a procedure for discharging the EV  100  stops. 
         [0150]    When the accept button is selected, the UTD  500  transmits a discharging acceptance message to the HCCS  300  and a procedure for discharging the EV  100  continues. 
         [0151]    Again,  FIG. 15  is described. 
         [0152]    When the discharging of the EV  100  is accepted by a user, the UTD  500  transmits an EV discharging confirmation message to the HCCS  300  in operation  5211 . 
         [0153]    Upon the receipt of the EV discharging confirmation message, the HCCS  300  transmits an EV battery information request message to the EVSE  200  in operation  5213 . 
         [0154]    Upon the receipt of the EV battery information request message from the HCCS  300 , the EVSE  200  collects information on the battery  140  of the EV  100  in operation  5215 . The EVSE  200  may collect information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. The information on the battery  140  of the EV  100  may include part or all of the total capacity of the battery  140 , the remaining power amount in the battery  140 , a power amount necessary for fully charging the battery  140 , a current SOC of the battery  140 , and an average cost spent for charging the battery  140 . Especially, the current SOC of the battery  140  may be expressed as a percentage. 
         [0155]    The EVSE  200  transmits an EV battery information response message to the HCCS  300  in operation  5218 . At this point, the EV battery information response message may include information on the battery  140  of the EV  100 . 
         [0156]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation  5219 . 
         [0157]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the battery  440  to the HCCS  300  in operation  5221 . At this point, the information on the battery  440  of the HPS  400  may include part or all of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0158]    Moreover, the HCCS  300  transmits a power policy request message to the power supply facility  600  in operation S 223 . 
         [0159]    Upon the receipt of the power policy request message from the HCCS  300 , the power supply facility  600  transmits a power policy response message including information on a power policy to the HCCS  300  in operation  5225 . At this point, the information on a power policy may include at least one of information on a power sale available time slot, information on a power sale price, information on a power purchase available time slot, and information on a power purchase price. The power sale available time zone is a time zone in which the power supply facility  600  is capable of selling power to the outside; the power sale price is a price at which the power supply facility  600  sells power to the outside; the power purchase available time zone is a time zone in which the power supply facility  600  is capable of purchasing power from the outside; and the power purchase price is a price at which the power supply facility  600  purchases power from the outside. 
         [0160]    The HCCS  300  determines the best available option by using the collected information in operation  5227 . At this point, the collected information may include at least one of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , and information on a power policy. 
         [0161]    At this point, since an electric power sink is defined as the EV  100 , the best available option may include a best electric power sink, a best discharging time slot, and a best discharging amount. 
         [0162]    The HCCS  300  may determine one of the HPS  400  and the power supply facility  600  as the best electric power sink. 
         [0163]    As described below, the HCCS  300  may determine a best electric power sink, a best discharging time slot, and a best discharging amount in operation S 923  and operation S 1135 . 
         [0164]    Then, a discharging method of an EV according to an embodiment of the present invention will be described with reference to  FIG. 16 . 
         [0165]      FIG. 16  is the rear part of a ladder diagram illustrating a discharging method of an EV according to an embodiment of the present invention. 
         [0166]    The HCCS  300  sets a power transfer connection between the EV  100  and a power sink in operation  5231 . If the sink source is the HPS  400 , the HCCS  300  may transmit a connection setting control message to the EV  100 , the EVSE  200 , and the HPS  400  and may then set a connection between the EV  100  and the HPS  400 . If the power sink is the power supply facility  600 , the HCCS  300  may transmit a connection setting control message to the EV  100 , the EVSE  200 , and the power supply facility  600  and may then set a connection between the EV  100  and the power supply facility  600 . At this point, the connection setting control message may include information on the above-mentioned best available option. 
         [0167]    If a connection is set between the EV  100  and the power sink, the HCCS  300  transmits a discharging permission request message to the UTD  500  and then requests a discharging permission from the UTD  500  in operation  5235 . At this point, the discharging permission request message may include at least one of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , information on a power policy of the power supply facility  600 , information on a determined power sink, and information on whether the EV  100  is successfully connected to the power sink. 
         [0168]    Upon the receipt of the discharging permission request message from the HCCS  300 , the UTD  500  displays a screen for requesting a discharging permission to a user in operation  5236 . Referring to  FIG. 19 , a screen displayed at this point is described. 
         [0169]      FIG. 19  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0170]    Upon the receipt of then EV discharging permission message, the UTD  500  displays a screen as shown in  FIG. 19 . At this point, the screen may include information on a determined power sink, discharging costs, contents for querying how much power is discharged from the EV  100 , and contents for querying a user so as to determine whether to permit the discharging of the EV  100 . Additionally, the UTD  500  may display an accept button for permitting EV discharging and a reject button for rejecting EV discharging. 
         [0171]    When the reject button is selected, the UTD  500  transmits a discharging recommendation rejection message to the HCCS  300  and a procedure for discharging the EV  100  stops. 
         [0172]    When the accept button is selected, the UTD  500  transmits a discharging permission message to the HCCS  300  and a procedure for discharging the EV  100  continues. 
         [0173]    When the discharging of the EV  100  is permitted by a user, the UTD  500  transmits the discharging permission message to the HCCS  300  in operation  5237 . At this point, the discharging permission message may include discharging amount information on how much power is discharged from the EV  100 . 
         [0174]    Upon the receipt of the discharging permission message from the UTD  500 , the HCCS  300  controls starting the discharging of the EV  100  according to a permitted discharging amount in the discharging permission message in operation  5240 . If the power sink is the HPS  400 , the HCCS  300  may transmit a discharging start control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may start the discharging of the EV  100 . If the power sink is the power supply facility  600 , the HCCS  300  may transmit a discharging start control message to part or all of the EV  100 , the EVSE  200 , and the power supply facility  600  and may start the discharging of the EV  100 . At this point, the discharging start control message may include part or all of information on the above-mentioned best available option and information on a discharging amount in the discharging permission message. 
         [0175]    During the discharging of the EV  100 , the UTD  500  may transmit a discharging information request message to the HCCS  300  in operation  5241 . 
         [0176]    In response to the discharging information request message of the UTD  500 , or periodically, or in response to satisfaction of other conditions, the HCCS  300  transmits an EV discharging information request message to the EVSE  200  to request information on the discharging of the EV  100  from the EVSE  200  in operation  5242 . 
         [0177]    In response to the EV discharging information request message of the HCCS  300 , or periodically, or in response to satisfaction of other conditions, the EVSE  200  collects discharging information on the battery  140  of the EV  100  in operation  5244 . The EVSE  200  may collect discharging information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect discharging information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. At this point, the discharging information may include part or all of an initial SOC, a current SOC, a discharge start time, an estimated discharge end time, an actual discharge end time, and an EV discharging status. The EV discharging status may represent discharging in progress or discharging completion. 
         [0178]    In response to the discharging information request message of the HCCS  300 , in correspondence to the reception of the discharging information response message, or periodically, or in response to satisfaction of other conditions, the EVSE  200  transmits a discharging information response message to the HCCS  300  in operation  5246 . The discharging information response message may include information on the discharging of the EV  100 . At this point, the discharging information may include an initial SOC, a current SOC, a discharge start time, an estimated discharge end time, an actual discharge end time, and an EV discharging status. 
         [0179]    In response to the discharging information request message of the UTD  500 , in correspondence to the reception of the discharging information response message of the EVSE  200 , or periodically, or in correspondence to satisfaction of other conditions, the HCCS  300  transmits a discharging information notification message to the UTD  500  in operation  5247 . The discharging information notification message may include part or all of information on the discharging of the EV  100  and information on a permitted discharging amount. At this point, the discharging information may include an initial SOC, a current SOC, a discharge start time, an estimated discharge end time, an actual discharge end time, and an EV discharging status. At this point, the EV discharging status may represent discharging in progress. 
         [0180]    Upon the receipt of the discharging information notification message, the UTD  500  displays discharging information in operation  5249 . 
         [0181]      FIG. 20  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0182]    As shown in  FIG. 20 , the UTD  500  may display an EV discharging status notifying that the discharging of the EV  100  is in progress, an initial SOC, a permitted discharging amount, a current SOC, a discharge start time, and an estimated discharge end time. 
         [0183]    Moreover, the HCCS  300  checks whether discharging is completed on the basis of a discharging information response message in operation  5251 . The HCCS  300  may determine whether the discharging of the EV  100  is completed on the basis of a current SOC, an actual charge end time, an estimated charge end time, and an EV charging status. 
         [0184]    When the discharging is completed, the HCCS  300  controls stopping the discharging of the EV  100  in operation  5253 . If the power sink is the HPS  400 , the HCCS  300  may transmit a discharging stop control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may stop the discharging of the EV  100 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a discharging stop control message to part or all of the EV  100 , the EVSE  200 , and the power supply facility  600  and may stop the discharging of the EV  100 . 
         [0185]    Or, when the discharging is completed, the HCCS  300  transmits a discharging completion notification message to the UTD  500  in operation  5255 . The discharging completion notification message may include information on the discharging of the EV  100  and information on a permitted discharging amount. At this point, the discharging information may include part or all of an initial SOC, a current SOC, a discharge start time, an estimated discharge end time, an actual discharge end time, and an EV discharging status. At this point, the EV discharging status may represent discharging completion. 
         [0186]    Upon the receipt of the discharging completion notification message, the UTD  500  displays discharging completion as shown in  FIG. 21  in operation  5257 . 
         [0187]      FIG. 21  is a view illustrating a screen displayed on an UTD according to another embodiment of the present invention. 
         [0188]    Upon the receipt of then EV charging completion notification message, as shown in  FIG. 21 , the UTD  500  may display an EV discharging status notifying that the discharging of the EV  100  is in progress, an initial SOC, a permitted discharging amount, a current SOC, a discharge start time, and an actual discharge end time. 
         [0189]    Then, a charging method of an HPS according to an embodiment of the present invention will be described with reference to  FIGS. 23 and 24 . 
         [0190]      FIG. 23  is the first part of a ladder diagram illustrating a charging method of an HPS according to an embodiment of the present invention. 
         [0191]    If detecting the charging of the HPS  400  is necessary, the HCCS  300  transmits an HPS charging recommendation message to the UTD  500  in operation S 501 . At this point, the HPS charging recommendation message may include information on the reason that the charging of the HPS  400  is necessary. 
         [0192]    Upon the receipt of the HPS charging recommendation message, the UTD  500  displays that the charging of the HPS  400  is necessary in operation S 502 . At this point, a screen similar to  FIG. 9  may be displayed. That is, upon the receipt of the HPS charging recommendation message, the UTD  500  displays that the charging of the HPS  400  is necessary and the reason for that. Additionally, the UTD  500  may display an accept button for accepting the HPS charging recommendation and a reject button for rejecting the HPS charging recommendation. 
         [0193]    When the reject button is selected, the UTD  500  transmits an HPS charging recommendation rejection message to the HCCS  300  and a procedure for charging the HPS  400  stops. 
         [0194]    When the accept button is selected, the UTD  500  transmits an HPS charging acceptance message to the HCCS  300  and a procedure for charging the HPS  400  continues. 
         [0195]    When the charging of the HPS  400  is accepted by a user, the UTD  500  transmits the HPS charging acceptance message to the HCCS  300  in operation S 503 . 
         [0196]    Upon the receipt of the HPS charging acceptance message from the UTD  500 , the HCCS  300  transmits an EV connection confirmation request message to the EVSE  200  to query whether the EV  100  is connected to the EVSE  200  in operation S 505 . 
         [0197]    Upon the receipt of the EV connection confirmation request message, the EVSE  200  checks whether the EV  100  is connected to the EVSE  200  and transmits an EV connection confirmation result message including information on an EV connection confirmation result to the HCCS  300  in operation S 507 . At this point, the EV connection confirmation result may include information on whether the EV  100  is connected to the EVSE  200 . 
         [0198]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation S 506 . 
         [0199]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the battery  440  to the HCCS  300  in operation S 508 . At this point, the information on the battery  440  of the HPS  400  may include at least one of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0200]    When the current SOC of the battery  440  of the HPS  400  is less than a reference value, the HCCS  300  transmits an HPS charging query message to the UTD  500  in operation S 509 . The HPS charging query message may include information describing that the current SOC of the battery  440  of the HPS  400  is less than the reference value. 
         [0201]    Upon the receipt of then HPS charging query message from the HCCS  300 , the UTD  500  displays to a user a screen for querying whether to proceed to charge the EV  100  in operation S 510 . Upon the receipt of the HPS charging query message, the UTD  500  may display information describing that the current SOC of the battery  440  of the HPS  400  is less than the reference value in addition to a content for querying whether to proceed to charge the HPS  400 . Additionally, the UTD  500  may display a confirm button for confirming HPS charging and a reject button for rejecting HPS charging. 
         [0202]    When the reject button is selected, the UTD  500  transmits an HPS charging rejection message to the HCCS  300  and a procedure for charging the HPS  400  stops. 
         [0203]    When the accept button is selected, the UTD  500  transmits an HPS charging confirmation message to the HCCS  300  and a procedure for charging the HPS  400  continues. 
         [0204]    When the charging of the HPS  400  is accepted by a user, the UTD  500  transmits an HPS charging confirmation message to the HCCS  300  in operation S 511 . 
         [0205]    Upon the receipt of the HPS charging confirmation message, the HCCS  300  transmits an EV battery information request message to the EVSE  200  in operation S 513 . 
         [0206]    Upon the receipt of the EV battery information request message from the HCCS  300 , the EVSE  200  collects information on the battery  140  of the EV  100  in operation S 515 . The EVSE  200  may collect information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. The information on the battery  140  of the EV  100  may include part or all of the total capacity of the battery  140 , the remaining power amount in the battery  140 , a power amount necessary for fully charging the battery  140 , a current SOC of the battery  140 , and an average cost spent for charging the battery  140 . Especially, the current SOC of the battery  140  may be expressed as a percentage. 
         [0207]    The EVSE  200  transmits an EV battery information response message to the HCCS  300  in operation S 518 . At this point, the EV battery information response message may include information on the battery  140  of the EV  100 . 
         [0208]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation S 519 . 
         [0209]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the battery  440  to the HCCS  300  in operation S 521 . At this point, the information on the battery  440  of the HPS  400  may include at least one of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0210]    Moreover, the HCCS  300  transmits a power policy request message to the power supply facility  600  in operation S 523 . 
         [0211]    Upon the receipt of the power policy request message from the HCCS  300 , the power supply facility  600  transmits a power policy response message including information on a power policy to the HCCS  300  in operation S 525 . At this point, the information on a power policy may include at least one of information on a power sale available time slot, information on a power sale price, information on a power purchase available time slot, and information on a power purchase price. The power sale available time zone is a time zone in which the power supply facility  600  is capable of selling power to the outside; the power sale price is a price at which the power supply facility  600  sells power to the outside; the power purchase available time zone is a time zone in which the power supply facility  600  is capable of purchasing power from the outside; and the power purchase price is a price at which the power supply facility  600  purchases power from the outside. 
         [0212]    The HCCS  300  determines the best available option by using the collected information in operation S 527 . At this point, the collected information may include at least one of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , and information on a power policy. 
         [0213]    At this point, since an electric power sink is defined as the HPS  400 , the best available option may include a best electric power source, a best charging time slot, and a best charging amount. 
         [0214]    The HCCS  300  may determine one of the EV  100  and the power supply facility  600  as the best electric power source. 
         [0215]    As described below, the HCCS  300  may determine a best electric power source, a best charging time slot, and a best charging amount in operation S 923  and operation S 1135 . 
         [0216]    Then, a charging method of an HPS according to an embodiment of the present invention will be described with reference to  FIG. 24 . 
         [0217]      FIG. 24  is the rear part of a ladder diagram illustrating a charging method of an HPS according to an embodiment of the present invention. 
         [0218]    The HCCS  300  sets a power transfer connection between the HPS  400  and a power source in operation S 531 . If the power source is the EV  100 , the HCCS  300  may transmit a connection setting control message to the EV  100 , the EVSE  200 , and the HPS  400  and may then set a connection between the EV  100  and the HPS  400 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a connection setting control message to the HPS  400  and the power supply facility  600  and may then set a connection between the HPS  400  and the power supply facility  600 . At this point, the connection setting control message may include information on the above-mentioned best available option. 
         [0219]    If a connection is set between the HPS  400  and the power source, the HCCS  300  transmits a charging permission request message to the UTD  500  and then requests a charging permission from the UTD  500  in operation S 535 . At this point, the HPS charging permission request message may include part or all of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , information on a power policy of the power supply facility  600 , information on a determined power source, and information on whether the HPS  400  is successfully connected to the power source. 
         [0220]    Upon the receipt of the HPS charging permission request message from the HCCS  300 , the UTD  500  displays a screen for requesting a charging permission to a user in operation S 536 . At this point, a screen similar to  FIG. 12  may be displayed. That is, the displayed screen may include information on a determined power source, charging costs, contents for querying how much power is charged to the HPS  400 , and contents for querying a user so as to determine whether to permit the charging of the HPS  400 . Additionally, the UTD  500  may display an accept button for permitting the charging of the HPS  400  and a reject button for rejecting the charging of the HPS  400 . 
         [0221]    When the reject button is selected, the UTD  500  transmits an HPS charging rejection message to the HCCS  300  and a procedure for charging the HPS  400  stops. 
         [0222]    When the accept button is selected, the UTD  500  transmits an HPS charging permission message to the HCCS  300  and a procedure for charging the HPS  400  continues. 
         [0223]    When the charging of the HPS  400  is permitted by a user, the UTD  500  transmits the HPS charging permission message to the HCCS  300  in operation S 537 . At this point, the HPS charging permission message may include information on how much power is charged to the EV  100 . 
         [0224]    Upon the receipt of the HPS charging permission message from the UTD  500 , the HCCS  300  transmits an HPS charging start instruction message to the HPS  400  and instructs starting the charging of the battery  440  of the HPS  400  in operation S 539 . At this point, the HPS charging start instruction message may include charging amount information on how much power is charged to the HPS  400 . 
         [0225]    Upon the receipt of the HPS charging permission message from the UTD  500 , the HCCS  300  controls starting the charging of the HPS  400  according to a permitted HPS charging amount in the charging permission message in operation S 540 . If the power source is the EV  100 , the HCCS  300  may transmit a charging start control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may then allow the HPS  400  to be charged by using the power of the HPS  400 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a charging start control message to part or all of the HPS  400 , the EVSE  200 , and the power supply facility  600  and may then allow the HPS  400  to be charged by using the power of the power supply facility  600 . At this point, the charging start control message may include part or all of information on the above-mentioned best available option and information on a charging amount in the charging permission message. 
         [0226]    During the charging of the EV  100 , the UTD  500  may transmit an HPS charging information request message to the HCCS  300  in operation S 541 . 
         [0227]    In response to the HPS charging information request message of the UTD  500 , or periodically, or in response to satisfaction of other conditions, the HCCS  300  transmits an HPS charging information request message to the HPS  400  to request information on the charging of the battery  440  of the HPS  400  from the HPS  400  in operation S 542 . 
         [0228]    In response to the HPS charging information request message of the HCCS  300 , or periodically, or in response to satisfaction of other conditions, the HPS  400  transmits an HPS charging information response message to the HCCS  300  in operation S 546 . The HPS charging information response message may include information on the charging of the HPS  400 . At this point, the charging information may include part or all of an HPS initial SOC, an HPS current SOC, an HPS charge start time, an HPS estimated charge end time, an HPS actual charge end time, and an HPS charging status. The HPS initial SOC represents a charging degree at an initial charging of the battery  440  of the HPS  400 . The HPS current SOC represents a current charging degree of the battery  440  of the HPS  400 . The HPS charging status may represent charging in progress or charging completion. 
         [0229]    In response to the HPS charging information request message of the UTD  500 , in correspondence to the reception of the HPS charging information response message of the HPS  400 , or periodically, or in correspondence to satisfaction of other conditions, the HCCS  300  transmits an HPS charging information notification message to the UTD  500  in operation S 547 . The HPS charging information notification message may include information on the charging of the HPS  400  and information on a permitted HPS charging amount. At this point, the charging information may include part or all of an HPS initial SOC, an HPS current SOC, an HPS charge start time, an HPS estimated charge end time, an HPS actual charge end time, and an HPS charging status. At this point, the HPS charging status may represent HPS charging in progress. 
         [0230]    Upon the receipt of then HPS charging information notification message, the UTD  500  displays charging information in operation S 549 . At this point, the UTD  500  may display a screen similar to  FIG. 13 . That is, the UTD  500  may display part or all of an HPS charging status, an initial SOC, a permitted HPS charging amount, a current SOC, a charge start time, and an estimated charge end time. 
         [0231]    Moreover, the HCCS  300  checks whether charging is completed on the basis of an HPS charging information response message in operation S 551 . The HCCS  300  may determine whether the discharging of the HPS  400  is completed on the basis of a current SOC, an actual charge end time, an estimated charge end time, and an HPS charging status. 
         [0232]    When the charging is completed, the HCCS  300  controls stopping the charging of the HPS  400  in operation S 553 . If the power source is the EV  100 , the HCCS  300  may transmit a charging stop control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may stop the charging of the HPS  400 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a charging stop control message to part or all of the HPS  400 , the EVSE  200 , and the power supply facility  600  and may stop the charging of the HPS  400 . 
         [0233]    Or, when the charging is completed, the HCCS  300  transmits an HPS charging completion notification message to the UTD  500  in operation S 555 . The HPS charging completion notification message may include information on the charging of the HPS  400  and information on a permitted HPS charging amount. At this point, the charging information may include part or all of an initial SOC, a current SOC, a charge start time, an estimated charge end time, an actual charge end time, and an HPS charging status. At this point, the HPS charging status may represent charging completion. 
         [0234]    Upon the receipt of then HPS charging completion notification message, the UTD  500  displays the charging completion in operation S 557 . At this point, the UTD  500  may display a screen similar to  FIG. 14 . 
         [0235]    Then, a discharging method of an HPS according to an embodiment of the present invention will be described with reference to  FIGS. 25 and 26 . 
         [0236]      FIG. 25  is the front part of a ladder diagram illustrating a discharging method of an HPS according to an embodiment of the present invention. 
         [0237]    If detecting the discharging of the HPS  400  is necessary, the HCCS  300  transmits an HPS discharging recommendation message to the UTD  500  in operation S 701 . At this point, the HPS discharging recommendation message may include information on the reason that the discharging of the HPS  400  is necessary. 
         [0238]    Upon the receipt of the HPS discharging recommendation message, the UTD  500  displays that the discharging of the HPS  400  is necessary in operation S 702 . At this point, a screen similar to  FIG. 17  may be displayed. That is, upon the receipt of the HPS discharging recommendation message, the UTD  500  displays that the discharging of the HPS  400  is necessary and the reason for that. Additionally, the UTD  500  may display an accept button for accepting an HPS discharging recommendation and a reject button for rejecting an HPS discharging recommendation. 
         [0239]    When the reject button is selected, the UTD  500  transmits an HPS discharging recommendation rejection message to the HCCS  300  and a procedure for discharging the HPS  400  stops. 
         [0240]    When the accept button is selected, the UTD  500  transmits an HPS discharging acceptance message to the HCCS  300  and a procedure for discharging the HPS  400  continues. 
         [0241]    When the discharging of the HPS  400  is accepted by a user, the UTD  500  transmits the HPS discharging acceptance message to the HCCS  300  in operation S 703 . 
         [0242]    Upon the receipt of the HPS discharging acceptance message from the UTD  500 , the HCCS  300  transmits an EV connection confirmation request message to the EVSE  200  to query whether the EV  100  is connected to the EVSE  200  in operation S 705 . 
         [0243]    Upon the receipt of the EV connection confirmation request message, the EVSE  200  checks whether the EV  100  is connected to the EVSE  200  and transmits an EV connection confirmation result message including information on an EV connection confirmation result to the HCCS  300  in operation S 707 . At this point, the EV connection confirmation result may include information on whether the EV  100  is connected to the EVSE  200 . 
         [0244]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation S 706 . 
         [0245]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the battery  440  to the HCCS  300  in operation S 708 . At this point, the information on the battery  440  of the HPS  400  may include at least one of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0246]    When the current SOC of the battery  440  of the HPS  400  is greater than a reference value, the HCCS  300  transmits an HPS discharging query message to the UTD  500  in operation S 709 . The HPS discharging query message may include information describing that the current SOC of the battery  440  of the HPS  400  is greater than the reference value. 
         [0247]    Upon the receipt of then HPS discharging query message from the HCCS  300 , the UTD  500  displays to a user a screen for querying whether to proceed to discharge the EV  100  in operation S 710 . Upon the receipt of the HPS discharging query message, the UTD  500  may display information describing that the current SOC of the battery  440  of the HPS  400  is greater than the reference value in addition to a content for querying whether to proceed to discharge the HPS  400 . Additionally, the UTD  500  may display an accept button for confirming HPS discharging and a reject button for rejecting HPS discharging. 
         [0248]    When the reject button is selected, the UTD  500  transmits an HPS discharging rejection message to the HCCS  300  and a procedure for discharging the HPS  400  stops. 
         [0249]    When the accept button is selected, the UTD  500  transmits an HPS discharging confirmation message to the HCCS  300  and a procedure for discharging the HPS  400  continues. 
         [0250]    When the discharging of the HPS  400  is accepted by a user, the UTD  500  transmits an HPS discharging confirmation message to the HCCS  300  in operation S 711 . 
         [0251]    Upon the receipt of the HPS discharging confirmation message, the HCCS  300  transmits an EV battery information request message to the EVSE  200  in operation S 713 . 
         [0252]    Upon the receipt of the EV battery information request message from the HCCS  300 , the EVSE  200  collects information on the battery  140  of the EV  100  in operation S 715 . The EVSE  200  may collect information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. The information on the battery  140  of the EV  100  may include part or all of the total capacity of the battery  140 , the remaining power amount in the battery  140 , a power amount necessary for fully charging the battery  140 , a current SOC of the battery  140 , and an average cost spent for charging the battery  140 . Especially, the current SOC of the battery  140  may be expressed as a percentage. 
         [0253]    The EVSE  200  transmits an EV battery information response message to the HCCS  300  in operation S 718 . At this point, the EV battery information response message may include information on the battery  140  of the EV  100 . 
         [0254]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation S 719 . 
         [0255]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the battery  440  to the HCCS  300  in operation S 721 . At this point, the information on the battery  440  of the HPS  400  may include at least one of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0256]    Moreover, the HCCS  300  transmits a power policy request message to the power supply facility  600  in operation S 723 . 
         [0257]    Upon the receipt of the power policy request message from the HCCS  300 , the power supply facility  600  transmits a power policy response message including information on a power policy to the HCCS  300  in operation S 725 . At this point, the information on a power policy may include at least one of information on a power sale available time slot, information on a power sale price, information on a power purchase available time slot, and information on a power purchase price. The power sale available time zone is a time zone in which the power supply facility  600  is capable of selling power to the outside; the power sale price is a price at which the power supply facility  600  sells power to the outside; the power purchase available time zone is a time zone in which the power supply facility  600  is capable of purchasing power from the outside; and the power purchase price is a price at which the power supply facility  600  purchases power from the outside. 
         [0258]    The HCCS  300  determines the best available option by using the collected information in operation S 727 . At this point, the collected information may include at least one of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , and information on a power policy. 
         [0259]    At this point, since an electric power sink is defined as the HPS  400 , the best available option may include a best electric power sink, a best discharging time slot, and a best discharging amount. 
         [0260]    The HCCS  300  may determine one of the EV  100  and the power supply facility  600  as the best electric power sink. 
         [0261]    As described below, the HCCS  300  may determine a best electric power sink, a best discharging time slot, and a best discharging amount in operation S 923  and operation S 1135 . 
         [0262]    Then, a discharging method of an HPS according to an embodiment of the present invention will be described with reference to  FIG. 26 . 
         [0263]      FIG. 26  is the rear part of a ladder diagram illustrating a discharging method of an HPS according to an embodiment of the present invention. 
         [0264]    The HCCS  300  sets a power transfer connection between the HPS  400  and a power source in operation S 731 . If the power source is the EV  100 , the HCCS  300  may transmit a connection setting control message to the EV  100 , the EVSE  200 , and the HPS  400  and may then set a connection between the EV  100  and the HPS  400 . If the power source is the power supply facility  600 , the HCCS  300  may transmit a connection setting control message to the HPS  400  and the power supply facility  600  and may then set a connection between the HPS  400  and the power supply facility  600 . At this point, the connection setting control message may include information on the above-mentioned best available option. 
         [0265]    If a connection is set between the HPS  400  and the power source, the HCCS  300  transmits an HPS discharging permission request message to the UTD  500  and then requests a discharging permission from the UTD  500  in operation S 735 . At this point, the HPS discharging permission request message may include part or all of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , information on a power policy of the power supply facility  600 , information on a determined power source, and information on whether the HPS  400  is successfully connected to the power source. 
         [0266]    Upon the receipt of the HPS discharging permission request message from the HCCS  300 , the UTD  500  displays a screen for requesting a discharging permission to a user in operation S 736 . At this point, a screen similar to  FIG. 20  may be displayed. That is, the displayed screen may include information on a determined power source, discharging profits, contents for querying how much power is discharged from the HPS  400 , and contents for querying a user so as to determine whether to permit the discharging of the HPS  400 . Additionally, the UTD  500  may display an accept button for permitting the discharging of the HPS  400  and a reject button for rejecting the charging of the HPS  400 . 
         [0267]    When the reject button is selected, the UTD  500  transmits an HPS discharging rejection message to the HCCS  300  and a procedure for discharging the HPS  400  stops. 
         [0268]    When the accept button is selected, the UTD  500  transmits an HPS discharging permission message to the HCCS  300  and a procedure for discharging the HPS  400  continues. 
         [0269]    When the discharging of the HPS  400  is permitted by a user, the UTD  500  transmits the HPS discharging permission message to the HCCS  300  in operation S 737 . At this point, the HPS discharging permission message may include information on how much power is discharged from the EV  100 . 
         [0270]    Upon the receipt of the HPS discharging permission message from the UTD  500 , the HCCS  300  transmits an HPS discharging start instruction message to the HPS  400  and instructs starting the discharging of the battery  440  of the HPS  400  in operation S 739 . At this point, the HPS discharging start instruction message may include discharging amount information on how much power is discharged from the HPS  400 . 
         [0271]    Upon the receipt of the HPS discharging permission message from the UTD  500 , the HCCS  300  controls starting the discharging of the HPS  400  according to a permitted HPS discharging amount in the discharging permission message in operation S 740 . If the power sink is the EV  100 , the HCCS  300  may transmit a discharging start control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may start the discharging of the HPS  400 . If the power sink is the power supply facility  600 , the HCCS  300  may transmit a discharging start control message to part or all of the HPS  400 , the EVSE  200 , and the power supply facility  600  and may start the discharging of the HPS  400 . At this point, the discharging start control message may include part or all of information on the above-mentioned best available option and information on a discharging amount in the discharging permission message. 
         [0272]    During the discharging of the EV  100 , the UTD  500  may transmit an HPS discharging information request message to the HCCS  300  in operation S 741 . 
         [0273]    In response to the HPS discharging information request message of the UTD  500 , or periodically, or in response to satisfaction of other conditions, the HCCS  300  transmits an HPS discharging information request message to the HPS  400  to request information on the discharging of the battery  440  of the HPS  400  from the HPS  400  in operation S 742 . 
         [0274]    In response to the HPS discharging information request message of the HCCS  300 , or periodically, or in response to satisfaction of other conditions, the HPS  400  transmits an HPS discharging information response message to the HCCS  300  in operation S 746 . The HPS discharging information response message may include information on the discharging of the HPS  400 . At this point, the discharging information may include part or all of an HPS initial SOC, an HPS current SOC, an HPS discharge start time, an HPS estimated discharge end time, an HPS actual discharge end time, and an HPS discharging status. The HPS initial SOC represents a charging degree at an initial discharging of the battery  440  of the HPS  400 . The HPS current SOC represents a current charging degree of the battery  440  of the HPS  400 . The HPS discharging status may represent discharging in progress or discharging completion. 
         [0275]    In response to the HPS discharging information request message of the UTD  500 , in correspondence to the reception of the HPS discharging information response message of the HPS  400 , or periodically, or in correspondence to satisfaction of other conditions, the HCCS  300  transmits an HPS discharging information notification message to the UTD  500  in operation S 747 . The HPS discharging information notification message may include information on the discharging of the EV  100 . At this point, the discharging information may include part or all of an HPS initial SOC, an HPS current SOC, an HPS discharge start time, an HPS estimated discharge end time, an HPS actual discharge end time, and an HPS discharging status. 
         [0276]    Upon the receipt of then HPS discharging information notification message, the UTD  500  displays discharging information in operation S 749 . At this point, the UTD  500  may display a screen similar to  FIG. 21 . The UTD  500  may display an HPS discharging status, an initial SOC, a current SOC, a discharge start time, and an estimated discharge end time. Once the discharging is completed, the UTD  500  may display an actual discharge end time additionally. 
         [0277]    Moreover, the HCCS  300  checks whether discharging is completed on the basis of an HPS discharging information response message in operation S 751 . The HCCS  300  may determine whether the discharging of the HPS  400  is completed on the basis of a current SOC, an actual charge end time, an estimated discharge end time, and an HPS discharging status. 
         [0278]    When the discharging is completed, the HCCS  300  controls stopping the discharging of the HPS  400  in operation S 753 . If the power sink is the EV  100 , the HCCS  300  may transmit a discharging stop control message to part or all of the EV  100 , the EVSE  200 , and the HPS  400  and may stop the discharging of the HPS  400 . If the power sink is the power supply facility  600 , the HCCS  300  may transmit a discharging stop control message to part or all of the HPS  400  and the power supply facility  600  and may stop the discharging of the HPS  400 . 
         [0279]    Or, when the discharging is completed, the HCCS  300  transmits an HPS discharging completion notification message to the UTD  500  in operation S 755 . 
         [0280]    Upon the receipt of then HPS discharging completion notification message, the UTD  500  displays discharging completion in operation S 757 . At this point, the UTD  500  may display a screen similar to  FIG. 22 . 
         [0281]    Then, a charging/discharging recommendation method according to an embodiment of the present invention will be described with reference to  FIG. 27 . 
         [0282]      FIG. 27  is a ladder diagram illustrating a charging/discharging recommendation method according to an embodiment of the present invention. 
         [0283]    Especially, in the above-mentioned EV charging method, EV discharging method, HPS charging method, and HPS charging method, the embodiment of  FIG. 27  may be performed to transmit a recommendation message. 
         [0284]    The HCCS  300  receives a power policy information message including power policy information from the power supply facility  600  periodically in operation S 901 . The HCCS  300  may transmit a power policy request message to the power supply facility  600  periodically and may thus receive a power policy response message including the power policy information from the power supply facility  600  periodically. At this point, the information on a power policy may include at least one of information on a power sale available time slot, information on a power sale price, information on a power purchase available time slot, and information on a power purchase price. The power sale available time zone is a time zone in which the power supply facility  600  is capable of selling power to the outside; the power sale price is a price at which the power supply facility  600  sells power to the outside; the power purchase available time zone is a time zone in which the power supply facility  600  is capable of purchasing power from the outside; and the power purchase price is a price at which the power supply facility  600  purchases power from the outside. 
         [0285]    The UTD  500  receives a power policy information message including power policy information from the power supply facility  600  periodically in operation S 903 . The UTD  500  may transmit a power policy request message to the power supply facility  600  periodically and may thus receive a power policy response message including the power policy information from the power supply facility  600  periodically. The UTD  500  may display information on a power policy. A user may determine the charging/discharging of an EV or an HPS by referring to the displayed power policy information. Especially, a user may input a power source, a power sink, and a control time to the UTD  500 . Here, the power source may be the EV  100 , the HPS  400 , or the power supply facility  600 . Additionally, the power sink may be the EV  100 , the HPS  400 , or the power supply facility  600 . For example, if the power sink is the EV  100 , this means charging the EV  100  at the control time. If the power source is the power supply facility  600  and the power sink is the EV  100 , this means charging the EV  100  with an energy from the power supply facility  600  at the control time. Moreover, if the power source is the EV  100  and the power sink is the power supply facility  600 , this means discharging the EV  100  to the power supply facility  600  at the control time. 
         [0286]    The UTD  500  transmits a price query message to the HCCS  300  in operation S 905 . The UTD  500  may transmit a price query message including at least one of a power source, a power sink, and a control time to the HCCS  300  and may then query the price of when transferring power from the power source to the power sink at the control time. 
         [0287]    Upon the receipt of the price query message from the UTD  500 , the HCCS  300  transmits an EV battery information request message to the EVSE  200  in operation S 913 . 
         [0288]    Upon the receipt of the EV battery information request message from the HCCS  300 , the EVSE  200  collects information on the battery  140  of the EV  100  in operation S 915 . The EVSE  200  may collect information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. The information on the battery  140  of the EV  100  may include part or all of the total capacity of the battery  140 , the remaining power amount in the battery  140 , a power amount necessary for fully charging the battery  140 , a current SOC of the battery  140 , and an average cost spent for charging the battery  140 . Especially, the current SOC of the battery  140  may be expressed as a percentage. 
         [0289]    The EVSE  200  transmits an EV battery information response message to the HCCS  300  in operation S 918 . At this point, the EV battery information response message may include information on the battery  140  of the EV  100 . 
         [0290]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation S 919 . 
         [0291]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the checked battery  440  to the HCCS  300  in operation S 921 . At this point, the information on the battery  440  of the HPS  400  may include at least one of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0292]    The HCCS  300  determines a recommendation control content list by using the collected information in operation S 923 . At this point, the collected information may include at least one of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , and information on a power policy. The recommendation control content list includes at least one recommendation control content. Each recommendation control content may include part or all of a price, a power source, a power sink, a control time, and a power amount. The price at this time may be a cost or a profit. If the recommendation control content includes all of a price, a power source, a power sink, and a control time, this may mean that the power of the power source corresponding to a corresponding power amount transfers to the power sink at the control time with a corresponding price. For example, if the power source is the power supply facility  600 , the power sink is the EV  100 , the control time is 13 hr, the price is 1$, and the power amount is 1 Wh, this means charging the EV  100  with a power of 1 Wh from the power supply facility  600  at a cost of 1$ at  13 : 00 . If the power source is the EV  100 , the power sink is the power supply facility  600 , the control time is 13 hr, the price is 1$, and the power amount is 1 Wh, this means selling a power of 1 Wh from the EV  100  to the power supply facility  600  at a cost of 1$ at 13:00. 
         [0293]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is greater than a reference value and an average cost spent for charging the battery  140  is less than a power purchase price of the power supply facility  600 , the HCCS  300  may determine a power source as the EV  100  and also may determine a power sink as the power supply facility  600 . 
         [0294]    According to an embodiment of the present invention, the current SOC of the battery  440  of the HPS  400  is greater than a reference value and an average cost spent for charging the battery  440  is less than a power purchase price of the power supply facility  600 , the HCCS  300  may determine a power source as the HPS  400  and also may determine a power sink as the power supply facility  600 . 
         [0295]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is less than a reference value and the SOC of the battery  440  of the HPS  400  is less than a reference value, the HCCS  300  may determine a power sink as the HPS  400  and the EV  100  and also may determine a power source as the power supply facility  600 . 
         [0296]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is less than a reference value, the SOC of the battery  440  of the HPS  400  is greater than a reference value, and a power purchase price of the power supply facility  600  is greater than an average cost spent for charging the battery  440 , the HCCS  300  may determine a power source as the HPS  400  and the EV  100  and also may determine a power sink as the EV  100 . 
         [0297]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is less than a reference value, the SOC of the battery  440  of the HPS  400  is greater than a reference value, and a power purchase price of the power supply facility  600  is less than an average cost spent for charging the battery  440 , the HCCS  300  may determine a power source as the power supply facility  600  and also may determine a power sink as the EV  100 . 
         [0298]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is greater than a reference value, the SOC of the battery  440  of the HPS  400  is less than a reference value, and a power purchase price of the power supply facility  600  is greater than an average cost spent for charging the battery  140 , the HCCS  300  may determine a power source as the EV  100  and also may determine a power sink as the HPS  400 . 
         [0299]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is greater than a reference value, the SOC of the battery  440  of the HPS  400  is less than a reference value, and a power purchase price of the power supply facility  600  is less than an average cost spent for charging the battery  140 , the HCCS  300  may determine a power source as the power supply facility  600  and also may determine a power sink as the HPS  400 . 
         [0300]    Then, the HCCS  300  provides a recommendation message including a recommendation control content list to the UTD  500  in operation S 925 . 
         [0301]    After operation S 925 , part of all of the procedures shown in  FIGS. 7 ,  8 ,  15 ,  16 , and  23  to  26  may be performed. 
         [0302]    Then, a time scheduling method according to an embodiment of the present invention will be described with reference to  FIGS. 28 and 29 . 
         [0303]      FIG. 28  is the first part of a ladder diagram illustrating a time scheduling method according to an embodiment of the present invention.  FIG. 29  is the rear part of a ladder diagram illustrating a time scheduling method according to an embodiment of the present invention. 
         [0304]    If demands for electricity occur drastically, the power supply facility  600  transmits a scheduling update message including scheduling information on the power supply facility  600  to the HCCS  300  in operation S 1101 . At this point, the scheduling information on the power supply facility  600  may include information on at least one time slot. Information on each time slot may include part or all of information on whether the power supply facility  600  is capable of selling or purchasing power in a corresponding time slot and information on a power amount sold or purchased in a corresponding time slot. 
         [0305]    When the timing of the charging or discharging of the EV  100  or the charging or discharging of the HPS  400  is missed, a user may attempt to change the charging/discharging scheduling of the EV  100  or the HPS  400 . Upon the receipt of such scheduling change information from a user, the UTD  500  transmits a scheduling update message including user scheduling information to the HCCS  300  in operation S 1103 . At this pint, the user scheduling information may include information on a time slot that a user uses the EV  100  and a time slot that a user does not use the EV  100 . 
         [0306]    Upon the receipt of the scheduling update message from the power supply facility  600  or the UTD  500 , the HCCS  300  transmits an EV battery information request message to the EVSE  200  in operation S 1113 . 
         [0307]    Upon the receipt of the EV battery information request message from the HCCS  300 , the EVSE  200  collects information on the battery  140  of the EV  100  in operation S 1115 . The EVSE  200  may collect information on the battery  140  of the EV  100  by checking it through the charging/discharging point  150 . The EVSE  200  may collect information on the battery  140  of the EV  100  through the measurement device  120  such as an EUMD. The information on the battery  140  of the EV  100  may include part or all of the total capacity of the battery  140 , the remaining power amount in the battery  140 , a power amount necessary for fully charging the battery  140 , a current SOC of the battery  140 , and an average cost spent for charging the battery  140 . Especially, the current SOC of the battery  140  may be expressed as a percentage. 
         [0308]    The EVSE  200  transmits an EV battery information response message to the HCCS  300  in operation S 1118 . At this point, the EV battery information response message may include information on the battery  140  of the EV  100 . 
         [0309]    Moreover, the HCCS  300  transmits an HPS battery information request message to the HPS  400  in operation S 1119 . 
         [0310]    Upon the receipt of the HPS battery information request message from the HCCS  300 , the HPS  400  checks the battery  440  and transmits an HPS battery information response message including information on the checked battery  440  to the HCCS  300  in operation S 1121 . At this point, the information on the battery  440  of the HPS  400  may include at least one of the total capacity of the battery  440 , the remaining power amount in the battery  440 , a power amount necessary for fully charging the battery  440 , a current SOC of the battery  440 , and an average cost spent for charging the battery  440 . Especially, the current SOC of the battery  440  may be expressed as a percentage. 
         [0311]    Moreover, the HCCS  300  transmits a power policy request message to the power supply facility  600  in operation S 1123 . 
         [0312]    Upon the receipt of the power policy request message from the HCCS  300 , the power supply facility  600  transmits a power policy response message including information on a power policy to the HCCS  300  in operation S 1125 . At this point, the information on a power policy may include at least one of information on a power sale available time slot, information on a power sale price, information on a power purchase available time slot, and information on a power purchase price. The power sale available time zone is a time zone in which the power supply facility  600  is capable of selling power to the outside; the power sale price is a price at which the power supply facility  600  sells power to the outside; the power purchase available time zone is a time zone in which the power supply facility  600  is capable of purchasing power from the outside; and the power purchase price is a price at which the power supply facility  600  purchases power from the outside. 
         [0313]    The HCCS  300  transmits a user preference query message to the UTD  500  in operation S 1127 . At this point, the user preference query message may include part or all of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , and information on a power policy. 
         [0314]    The UTD  500  displays information included in the user preference query message to provide guide information for determining a user preference to a user in operation S 1129 . 
         [0315]    The UTD  500  receives a user preference content in operation S 1131 . At this point, the user preference content may include part or all of a preference for price, a preference for time, and a preference for power amount for charging and discharging. 
         [0316]    The UTD  500  transmits a user preference response message including the user preference content to the HCCS  300  in operation S 1133 . 
         [0317]    The HCCS  300  determines a recommendation control content list by using the collected information in operation S 1135 . At this point, the collected information may include part or all of information on the battery  140  of the EV  100 , information on the battery  440  of the HPS  400 , information on a power policy, a user preference content, user scheduling information, and power supply facility scheduling information. The recommendation control content list includes at least one recommendation control content. Each recommendation control content may include part or all of a price, a power source, a power sink, a control time, and a power amount. The price at this time may be a cost or a profit from a user perspective view. The control time may mean a reservation time. If the recommendation control content includes all of a price, a power source, a power sink, and a control time, this may mean that the power of the power source corresponding to a corresponding power amount transfers to the power sink at the control time with a corresponding price. For example, if the power source is the power supply facility  600 , the power sink is the EV  100 , the control time is 13 hr, the price is 1$, and the power is 1 Wh, this means charging the EV  100  with a power of 1 Wh from the power supply facility  600  at a cost of 1$ at 13:00. If the power source is the EV  100 , the power sink is the power supply facility  600 , the control time is 13 hr, the price is 1$, and the power is 1 Wh, this means selling a power of 1 Wh from the EV  100  to the power supply facility  600  at a cost of 1$ at  13 : 00 . 
         [0318]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is greater than a reference value and an average cost spent for charging the battery  140  is less than a power purchase price of the power supply facility  600 , the HCCS  300  may determine a power source as the EV  100  and also may determine a power sink as the power supply facility  600 . At this point, the HCCS  300  may determine a control time on the basis of information on a time slot in which a user does not use the EV  100  and information on a time slot in which the power supply facility  600  is capable of purchasing power. 
         [0319]    According to an embodiment of the present invention, the current SOC of the battery  440  of the HPS  400  is greater than a reference value and an average cost spent for charging the battery  440  is less than a power purchase price of the power supply facility  600 , the HCCS  300  may determine a power source as the HPS  400  and also may determine a power sink as the power supply facility  600 . At this point, the HCCS  300  may determine a control time on the basis of information on a time slot in which the power supply facility  600  is capable of purchasing power. 
         [0320]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is less than a reference value and the SOC of the battery  440  of the HPS  400  is less than a reference value, the HCCS  300  may determine a power sink as the HPS  400  and the EV  100  and also may determine a power source as the power supply facility  600 . At this point, the HCCS  300  may determine a control time on the basis of information on a time slot in which a user does not use the EV  100  and information on a time slot in which the power supply facility  600  is capable of selling power. 
         [0321]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is less than a reference value, the SOC of the battery  440  of the HPS  400  is greater than a reference value, and a power purchase price of the power supply facility  600  is greater than an average cost spent for charging the battery  440 , the HCCS  300  may determine a power source as the HPS  400  and the EV  100  and also may determine a power sink as the EV  100 . At this point, the HCCS  300  may determine a control time on the basis of information on a time slot in which a user does not use the EV  100 . 
         [0322]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is less than a reference value, the SOC of the battery  440  of the HPS  400  is greater than a reference value, and a power purchase price of the power supply facility  600  is less than an average cost spent for charging the battery  440 , the HCCS  300  may determine a power source as the power supply facility  600  and also may determine a power sink as the EV  100 . At this point, the HCCS  300  may determine a control time on the basis of information on a time slot in which a user does not use the EV  100  and information on a time slot in which the power supply facility  600  is capable of selling power. 
         [0323]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is greater than a reference value, the SOC of the battery  440  of the HPS  400  is less than a reference value, and a power purchase price of the power supply facility  600  is greater than an average cost spent for charging the battery  140 , the HCCS  300  may determine a power source as the EV  100  and also may determine a power sink as the HPS  400 . At this point, the HCCS  300  may determine a control time on the basis of information on a time slot in which a user does not use the EV  100 . 
         [0324]    According to an embodiment of the present invention, the current SOC of the battery  140  of the EV  100  is greater than a reference value, the SOC of the battery  440  of the HPS  400  is less than a reference value, and a power purchase price of the power supply facility  600  is less than an average cost spent for charging the battery  140 , the HCCS  300  may determine a power source as the power supply facility  600  and also may determine a power sink as the HPS  400 . At this point, the HCCS  300  may determine a control time on the basis of information on a time slot in which the power supply facility  600  is capable of selling power. 
         [0325]    Then, the HCCS  300  transmits a recommendation message including a recommendation control content list to the UTD  500  in operation S 1137 . 
         [0326]    The UTD  500  transmits a power control request message including selection information on at least one of recommendation control contents in the recommendation control content list to the HCCS  300  in operation S 1139 . 
         [0327]    The HCCS  300  transmits a power service request message to the power supply facility  600  to request a power service according to the selected recommendation control content from the power supply facility  600  in operation S 1141 . At this point, the power service request message may include information on the selected recommendation control content. 
         [0328]    The power supply facility  600  checks whether to provide the power service according to the selected recommendation control content and then transmits a power service response message to the HCCS  300  in operation S 1143 . At this point, the power service response message includes information on whether the power supply facility  600  is capable of providing the power service according to the selected recommendation control content. 
         [0329]    The HCCS  300  transmits the power control response message to the UTD  500  in operation S 1145 . At this point, the power control response message may include information on whether a power control is possible according to the selected recommendation control content. 
         [0330]    After operation S 1145 , part of all of the procedures shown in  FIGS. 7 ,  8 ,  15 ,  16 , and  23  to  26  may be performed. 
         [0331]    Then, an interruption information providing method according to an embodiment of the present invention will be described with reference to  FIG. 30 . 
         [0332]      FIG. 30  is a ladder diagram illustrating an interruption information providing method according to an embodiment of the present invention. 
         [0333]    Especially, the procedure of  FIG. 30  may be performed during the charging or discharging of the EV  100  according to the embodiments of  FIGS. 7 to 29 . 
         [0334]    If an interruption factor of the charging or discharging of the EV  100  is detected by the EV  100  in operation S 1301 , the EV  100  transmits a charging/discharging interruption notification message to the EVSE  200  in operation S 1303 . At this point, the charging/discharging interruption notification message may include information on an interruption factor of charging or discharging. The interruption factor of charging or discharging may be an external factor such as a plug unplugged by a dog or a people or blackout or may be an internal factor of the EV  100  such as a circuit problem. 
         [0335]    If analyzing a charging/discharging interruption notification message from the EV  100  or detecting an interruption factor of the charging or discharging of the EV  100  through other detection means in operation S 1305 , the EVSE  200  transmits a charging/discharging interruption notification message to the HCCS  300  in operation S 1307 . At this point, the charging/discharging interruption notification message transmitted by the EVSE  200  may include information on an interruption factor of charging or discharging detected by the EVSE  200 . 
         [0336]    If analyzing a charging/discharging interruption notification message from the EVSE  200  or detecting an interruption factor of the charging or discharging of the EV  100  through other detection means in operation S 1309 , the HCCS  300  transmits a charging/discharging interruption notification message to the UTD  500  in operation S 1311 . At this point, the charging/discharging interruption notification message transmitted by the HCCS  300  may include information on an interruption factor of charging or discharging detected by the HCCS  300 . Especially, the HCCS  300  may detect whether the charging/discharging of the EV  100  is interrupted on the basis of the above-mentioned EV charging information or EV discharging information. In more detail, if it is checked that the current SOC is maintained for a predetermined time, the HCCS  300  may detect that the charging/discharging of the EV  100  is interrupted. 
         [0337]    Upon the receipt of a charging/discharging interruption notification message, the UTD  500  displays the EV charging/discharging interruption in operation S 1313 . At this point, the UTD  500  may display a charging/discharging interruption factor in addition to that the charging/discharging of the EV  100  is interrupted. 
         [0338]    According to an embodiment of the present invention, by exchanging various information between power use subjects such as UTDs, EVs, EVSEs, HCCSs, HPSs, and power supply facilities, it is possible to adaptively deal demands for electricity. Thus, this may contribute to the protection of environment. 
         [0339]    According to an embodiment of the present invention, the above method also can be embodied as computer readable codes on a computer readable recording medium having a program recorded thereon. Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, and optical data storage devices and also include carrier waves (such as data transmission through the Internet). 
         [0340]    The above-described mobile terminal is not applied as limited to the configurations and methods of the above embodiments. Some or all of the above embodiments are selectively combined and configured to provide various modifications.