Patent Publication Number: US-2020292596-A1

Title: Monitoring system

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefits of Japan Patent Application No. 2019-043668, filed on Mar. 11, 2019. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND OF THE DISCLOSURE 
     Technical Field 
     The disclosure relates to a monitoring system. 
     Related Art 
     Conventionally, in order to be able to confirm (grasp) an action state of an apparatus with a smartphone or the like, information relating to the action state of the apparatus is collected by a management server on the Internet (for example, see patent literatures 1 (Japanese Patent Laid-Open No. 2000-076033) and patent literatures 2 (Japanese Patent Laid-Open No. 2007-221565)). 
     Similarly, for a power storage system, information relating to an action state is collected by a management server on the Internet. 
     When a power storage system is used alone, the action state of the power storage system can be grasped only by information from the power storage system; however, when the power storage system is used in combination with a power generation system, it is desirable that the action state of the power generation system (mainly presence or absence of abnormality) can also be grasped. When information relating to the action state can be obtained from the power generation system, the presence or absence of abnormality of the power generation system can be diagnosed based on the information. Therefore, the action state of the power storage system can also be accurately grasped, but when the power generation system is made by another company or when the power generation system does not have a function of outputting the information relating to the action state to an external device, the information relating to the action state cannot be obtained from the power generation system. 
     SUMMARY 
     The disclosure is a monitoring system, including:
     a calculation part for calculating, based on first charged power index values indicating charged power of an power storage system and input/output power index values indicating input/output power from a power receiving point to which the power storage system is connected to a system, second charged power index values indicating power charged by generated power of a power generation system connected to the power receiving point of the charged power of the power storage system; and   a diagnosis part for diagnosing presence or absence of abnormality of the power generation system based on the second charged power index values calculated by the calculation part.   

    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a diagram illustrating a schematic configuration and a usage state of a monitoring system in Example 1 of the disclosure. 
         FIG. 2  is a schematic configuration diagram of a controller of a storage battery power conditioner in Example 1 of the disclosure. 
         FIG. 3  is a schematic configuration diagram of a monitoring device in Example 1 of the disclosure. 
         FIG. 4  is a flowchart showing a procedure of a charged power information transmission process in Example 1 of the disclosure. 
         FIG. 5  is a flowchart showing a procedure of a charged power information analysis process in Example 1 of the disclosure. 
         FIG. 6  is a diagram illustrating a calculation formula for charged power (self-consumption) of the disclosure. 
         FIG. 7  is a diagram illustrating another calculation formula of charged power (self-consumption) of the disclosure. 
         FIG. 8  is a flowchart showing a procedure of a calculation process of the charged power (self-consumption) in Example 1 of the disclosure. 
         FIG. 9  is a flowchart showing a procedure of a calculation process of the charged power (self-consumption) in Example 2 of the disclosure. 
         FIG. 10  is a flowchart showing a procedure of a charged power transmission process in Example 2 of the disclosure. 
         FIG. 11  is a flowchart showing a procedure of a charged power information analysis process in Example 2 of the disclosure. 
         FIG. 12  is a flowchart showing a procedure of a calculation/transmission process of the charged power (self-consumption) in Example 3 of the disclosure. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The disclosure provides a monitoring system which can diagnose presence or absence of abnormality of a power generation system connected to a power receiving point the same as a power storage system without obtaining any information from the power generation system. 
     According to the disclosure, a power generation state of the power generation system connected to a power receiving point the same as the power storage system can be grasped by monitoring the second charged power index values indicating the power charged by the generated power of the power generation system connected to the power receiving point of the charged power of the power storage system, and thus the presence or absence of abnormality of the power generation system can be diagnosed without obtaining any information from the power generation system. In addition, according to the disclosure, the power generation state of the power generation system connected to the power receiving point the same as the power storage system is grasped by monitoring the second charged power index values indicating the power charged by the generated power of the power generation system connected to the power receiving point of the charged power of the power storage system, and thus even when the power storage system and the power generation system are operated in a mode in which the power is not sold to the system via the power receiving point, the presence or absence of abnormality of the power generation system can be diagnosed without obtaining any information from the power generation system. 
     It is desirable that the first charged power index values and the input/output power index values are continuously acquired for a plurality of times in a manner that the acquisition is performed every day at a predetermined time zone. In this way, the presence or absence of abnormality of the power generation system can be diagnosed in distinction from a case where a power generation amount of the power generation system is temporarily reduced. 
     Here, the network includes, for example, the Internet, but is not limited thereto, and the disclosure can be applied to various networks such as an intranet and the like. In addition, the network may be connected by either a wired or wireless communication line. 
     In addition, in one embodiment of the disclosure, the diagnosis part may diagnose that there is an abnormality in the power generation system when a first predetermined number of the second charged power index values are all “0”. 
     Accordingly, since the second charged power index values are continuously “0” and the generated power from the power generation system is not continuously generated, it can be diagnosed that there is an abnormality in the power generation system. 
     In addition, in one embodiment of the disclosure, the diagnosis part may diagnose that there is an abnormality in the power generation system when a second predetermined number of the second charged power index values are equal to or less than a predetermined amount. 
     Accordingly, since the second charged power index values are continuously equal to or less than the predetermined amount and the generated power from the power generation system is continuously decreasing, it can be diagnosed that there is an abnormality in the power generation system. 
     In addition, in one embodiment of the disclosure, the power generation system may include a DC power generation device and a power conditioner which converts DC power from the DC power generation device to AC power; and the diagnosis part may diagnose that there is an abnormality in the power conditioner of the power generation system when the first predetermined number of the second charged power index values are all “0”, and diagnose that there is an abnormality in the DC power generation device of the power generation system when the second predetermined number of the second charged power index values are equal to or less than the predetermined amount. 
     In this way, the monitoring system can be provided in which when the power generation system includes the DC power generation device and the power conditioner which converts DC power from the DC power generation device into AC power, the presence or absence of the power generation system can be diagnosed without obtaining any information from the power generation system. 
     In addition, in one embodiment of the disclosure, when the diagnosis part diagnoses that there is an abnormality in the power generation system, a notification process for notifying a user of the power storage system of this diagnosis may be performed. 
     In this way, the user can recognize the presence or absence of abnormality of the power generation system diagnosed by the management server. 
     According to the disclosure, the monitoring system can be provided which can diagnose the presence or absence of abnormality of the power generation system connected to the power receiving point the same as the power storage system without obtaining any information from the power generation system. 
     APPLICATION EXAMPLES 
     
         
         Application examples of the disclosure are described below with reference to the drawings.  FIG. 1  is a diagram illustrating a schematic configuration and a usage state of a monitoring system according to Example 1 of the disclosure. 
         A power generation system  40  may be made by another company, or the power generation system  40  may not have a function of outputting information relating to an action state to an external device. In this case, in order to diagnose presence or absence of abnormality in the power generation system  40  connected to a power receiving point  55  the same as a power storage system  30  without obtaining any information from the power generation system  40 , it is conceivable to detect a failure of the power generation system by monitoring power reversely flowed from the power receiving point  55  to a system. 
       
    
     In general, when the power storage system  30  and the power generation system  40  are used in combination, there are a power sale priority mode which is a so-called economic mode, and a mode for self-consumption which is a so-called green mode.
     In the economic mode, at night, a storage battery  31  is charged with inexpensive late-night power supplied from the system and is used for a household load  50  as necessary. Besides, during the daytime, when power consumption of the household load  50  cannot be covered by generated power of a PV  41 , power of the storage battery  31  is discharged and used for the household load  50 . In addition, when the generated power of the PV  41  exceeds the power consumption of the household load  50 , the power is sold by reversely flowing the power to the system via the power receiving point  55 .   When the power generation system is run in the economic mode, the failure of the power generation system can be detected as described above by monitoring the power reversely flowed to the system from the power receiving point  55 .   

     However, in the green mode, the generated power of the PV  41  is entirely consumed at home without being sold to the system. That is, in this case, since basically the power is not reversely flowed to the system, it is not effective to detect the failure of the power generation system  40  by monitoring the power reversely flowed to the system as described above. However, even in the green mode, in order to make more use of the storage battery  31 , the storage battery  31  may also be charged with the inexpensive late-night power.
     The disclosure can detect, even when the power storage system  30  and the power generation system  40  are used in combination in this so-called green mode, the failure of the power generation system  40  by monitoring charged power of the storage battery  31 , especially the charged power (self-consumption) that is a part of the charged power and is carried by the generated power of PV  41  without obtaining any information from the power generation system  40 .   

     The monitoring system of the disclosure includes: a calculation part for calculating, based on first charged power index values indicating charged power of an power storage system and input/output power index values indicating input/output power amount from a power receiving point to which the power storage system is connected to a system, second charged power index values indicating power charged by generated power of a power generation system connected to the power receiving point of the charged power of the power storage system; and a diagnosis part for diagnosing presence or absence of abnormality of the power generation system based on the second charged power index values calculated by the calculation part.
     When the disclosure is applied to the monitoring system including the management server  10 , the monitoring device  20 , the power storage system  30 , and the power generation system  40 , the first charged power index values and the input/output power index values obtained from the power storage system  30  are transmitted to the management server  10  using the monitoring device  20  as a transmission device, and the management server  10  can be configured to include the calculation part and the diagnosis part.   In addition, when the disclosure is applied to a monitoring system including the management server  10 , the monitoring device  20 , the power storage system  30 , and the power generation system  40 , a storage battery power conditioner  32  of the power storage system  30  (hereinafter referred to as the storage battery PCS) can be configured to include the calculation part. In this case, the calculated second charged power index values can be transmitted to the management server  10  using the monitoring device  20  as a transmission device, and the management server  10  can be configured to include the diagnosis part.   In addition, when the disclosure is applied to a monitoring system including the management server  10 , the monitoring device  20 , the power storage system  30 , and the power generation system  40 , the monitoring device  20  can be configured to include the calculation part. In this case, the calculated second charged power index values can be transmitted to the management server  10  using the monitoring device as a transmission device, and the management server  10  can be configured to include the diagnosis part.   

     Example 1 
     
         
         A monitoring system according to Example 1 of the disclosure is described more specifically below using the drawings. 
       
    
     &lt;System Configuration&gt;
     An overview of the monitoring system according to the example of the disclosure is described using  FIG. 1 ,  FIG. 2  and  FIG. 3 .  FIG. 1  is an illustrative diagram of a schematic configuration and a usage form of the monitoring system according to the example,  FIG. 2  is a schematic configuration diagram of a controller of a storage battery PCS, and  FIG. 3  is a schematic configuration diagram of a monitoring device which is a component of the monitoring system.   

     As shown in  FIG. 1 , the monitoring system according to the example includes a management server  10 , a power storage system  30  combined with a power generation system  40 , and a monitoring device  20 . Moreover, “combined with the power generation system  40 ” means “connected to a power receiving point  55  to which the power generation system  40  is connected”. In addition,  FIG. 1  shows one power storage system  30  and one monitoring device  20 , but the monitoring system is usually built as a system which includes a plurality of the power storage systems  30  and the monitoring devices  20  prepared for each power storage system  30 . 
     The power storage system  30  is a system which includes a storage battery PCS  32  and a storage battery power sensor  33  which perform charge/discharge control of the storage battery  31  on the storage battery  31 . The storage battery power sensor  33  is not necessarily limited to being configured as a device independent of the storage battery PCS  32 . The storage battery power sensor  33  may be configured by a function of the storage battery PCS  32  of measuring a charged power amount of the storage battery and may constitute a part of the storage battery PCS 32 .  FIG. 2  shows a schematic configuration of a controller  320  of the storage battery PCS  32 . The controller  320  includes a calculation/control portion  321  and a storage portion  322 . The calculation/control unit  321  is configured by a processor such as a CPU or the like, and achieves various functions described later by executing a program. The storage portion  322  includes a main storage device in which the program or data executed by the calculation/control portion  321  are expanded, and an auxiliary storage device which stores the program or the data (including an apparatus ID described later). A connection line  325  is connected to a current sensor  35 , and a connection line  326  is connected to the storage battery power sensor  33 . In addition, a connection line  327  is connected to the storage battery  31 , and a connection line  328  is connected to each component of the storage battery PCS  32 . Besides, a connection line  26  is a communication cable connected to the monitoring device  20 . An A/D converter or a D/A converter is arranged depending on a format of signals input/output through each connection line, but is omitted in the drawings. The storage battery PCS  32  configuring the power storage system  30  has a function of controlling, based on output of the current sensor  35  for detecting a current flowing out to the system (reverse flow) or a current flowing from the system, the storage battery  31  in a manner that the power stored in the storage battery  31  is not reversely flowed (not sold). The storage battery PCS  32  also has the following functions. 
     A state value detection function of detecting various state values (a remaining power storage amount or a reversely flowed power amount of the storage battery  31 ) representing the action state of the power storage system  30 
     An error detection function of detecting errors occurring in the power storage system  30  (the storage battery PCS  32  and the storage battery  31 )   An information output function of returning, to the monitoring device  20 , information requested by the monitoring device  20  connected by the communication cable  26  Moreover, the information which can be provided to the monitoring device  20  by the information output function of the storage battery PCS  32  includes the state values detected by the state value detection function, status information indicating a present state of the power storage system  30  (normal or during error occurrence), and the apparatus ID assigned to the storage battery PCS  32 , and the like.   

     The power generation system  40  combined with the power storage system  30  may be a system connected to a commercial power system via the power receiving point. However, in the following description, the power generation system  40  is a solar power generation system in which a photovoltaic array  41  (hereinafter referred to as the PV  41 ) and a PV power conditioner (hereinafter referred to as the PV-PCS)  42  are combined. Here, the PV  41  corresponds to a DC power generation device and the PV-PCS  42  corresponds to a power conditioner which converts DC power into AC power. 
     The management server  10  is a Web server including a large-capacity nonvolatile storage device (such as a hard disk or the like), a control unit centered on a processor, and an NIC (Network Interface Card) as main components. The management server  10  includes a power storage system management database  12  for storing various types of information transmitted from the monitoring device  20  for each power storage system  30  to each power storage system  30 . The power storage system management database  12  (hereinafter also referred to as the management DB  12 ) also stores information (e-mail address, login information) for users (owners, or the like) of each power storage system  30 . Based on the information in the management DB  12 , the management server  10  performs a process of providing each user with a web page on which the action status of the power storage system  30  can be confirmed, or a process of notifying each user of an error occurrence by e-mail. 
     The monitoring device  20  is a device for notifying the user and the management server  10  of the action state of the power storage system  30 . As shown in  FIG. 3 , the monitoring device  20  includes an LCD (Liquid Crystal Display)  21 , a control unit  22 , a NIC  23 , and an operation portion  24 . 
     The NIC  23  is an interface circuit for communicating with the management server  10 . The monitoring device  20  is usually connected to the Internet via a router  15 . 
     The operation portion  24  is a unit including a plurality of push button switches. The control unit  22  is a unit in which a processor (CPU, microcontroller, or the like) and its peripheral circuits are combined. The control unit  22  acts as follows based on set program and information (such as an address of the management server  10  and the like). 
     When the power is turned on, the control unit  22  communicates with the connected storage battery PCS  32  to thereby grasp the apparatus ID of the storage battery PCS  32  (hereinafter referred to as self-apparatus ID). Then, the control unit  22  shifts to a normal state. 
     The control unit  22  which has shifted to the normal state accepts display instructions for various types of information (a remaining power storage amount, a charged/discharged power amount, error in occurrence, and the like) from the user through an operation on the operation portion  24 . When receiving a display instruction for certain information, the control unit  22  acquires the information from the storage battery PCS  32  and displays the information on the LCD  21 . 
     The configuration and the action of the monitoring system according to the example are described below more specifically.
     As described above, the monitoring device  20  (control unit  22 ) can acquire the information relating to the action state of the power storage system  30  by communicating with the storage battery PCS  32 . However, the monitoring device  20  is not configured to be able to communicate with the PV-PCS  42  (see  FIG. 1 ). Therefore, the monitoring device  20  cannot obtain information relating to the action state from the PV-PCS  42 , but in order to accurately grasp the action state of the power storage system  30 , it is better to know the action state of the power generation system  40 .   

     In order to be able to grasp the action state of the power generation system  40 , the control unit  22  of the monitoring system according to the embodiment has a function of performing an information transmission process (hereinafter referred to as a charged power information transmission process) relating to charged power of the storage battery and input/output power values to/from the system every day at a predetermined time (for example, 12:00), the procedure of the process being shown in  FIG. 4 . In addition, the management server  10  has a function of performing a charged power information analysis process during reception of the values of the charged power of the storage battery and the input/output power to/from the system (details will be described later), the procedure of the process being shown in  FIG. 4 . Here, the function of performing the charged power information analysis process corresponds to the diagnosis part. 
     &lt;Charged Power Information Transmission Process, Charged Power Information Analysis Process and Charged Power (Self-Consumption) Calculation Process&gt;
     That is, as shown in  FIG. 4 , the control unit  22  acquires, at a predetermined time every day, the charged power of the storage battery  31  from the storage battery power sensor  33  (step S 101 ) and acquires the input/output power values to/from the system from the storage battery PCS  32  (step S 102 ). Here, the charged power of the storage battery  31  is an index value of the amount of power charged into the storage battery within a predetermined time. The charged power of the storage battery  31  may be a charged power amount or a received current value and a charged voltage value as long as the amount of power charged to the storage battery within a predetermined time is known.   

     In addition, the process in step S 101  may be a process of acquiring values which have already been measured from the storage battery power sensor or a process of causing the storage battery power sensor to perform a new measurement. Furthermore, the input/output power value to/from the system is an example of an input/output power index value indicating an index of the amount of power flowing from the system within a predetermined time or the amount of power reversely flowed to the system within a predetermined time. As long as the inflow or reversely flowed power amount within a predetermined time is known, the input/output power index values to/from the system may be the inflow or reversely flowed power amount, or values which may be obtained by calculating the input/output power values, such as inflow current values or a reversely flowed current values measured by the current sensor  35  and a system voltage measured by the storage battery PCS  32 . In addition, the process in step S 102  may be a process of acquiring the values which have been measured from the storage battery PCS or a process of causing the storage battery PCS  32  to perform a new measurement of the input/output values. Here, the charged power corresponds to first power index values, and the input/output power values to/from the system correspond to the input/output power index values. 
     The control unit  22  which has ended the processes in step S 101  and step S 102  transmits the charged power information in a predetermined format, in which the acquired charged power, the input/output power values, and the self-apparatus ID are set, to the management server  10  using the NIC  23  (step S 103 ). 
     The management server  10  which receives the charged power information starts the charged power information analysis process ( FIG. 5 ), and first grasps the charged power, the input/output power values, and the apparatus ID which are set in the received charged power information (step S 201 ). Next, the management server  10  calculates charged power (self-consumption) based on the charged power and the input/output power values set in the received charged power information (step S 202 ). Here, the charged power (self-consumption) corresponds to the second charged power, and the function of calculating the charged power (self-consumption) corresponds to the calculation part. 
     Here, a charged power (self-consumption) calculation subroutine is described.
       FIG. 6A ,  FIG. 6B  and  FIG. 7  are diagrams illustrating a method of calculating the charged power (self-consumption).  FIG. 8  is a flowchart illustrating the procedure of the charged power (self-consumption) calculation process in the control unit  22 .     FIG. 6A  and  FIG. 6B  are diagrams schematically showing input/output of power between the storage battery PCS  32 , the PV-PCS  42 , and the household load  50  shown in  FIG. 1  and a commercial power system  60 .  FIG. 6A  and  FIG. 6B  show a case where the storage battery  31  is charged and the power is sold to the system. Here, Pa is the charged power of the storage battery  31 , Pp is the generated power of the PV  41 , Ph is the power consumption of the household load, and Ps is the sold (reversely flowed) power to the system  60 . Here, when the charged power (self-consumption) is presented as Pad, the charged power (self-consumption) Pad is a part of the charged power of the storage battery  31  which is carried by the generated power of the PV  41  except for the power input from the system  60 .   

     In the state shown in  FIG. 6A , in a system including the storage battery PCS  32 , the PV-PCS  42 , the household load  50 , and the system  60 , the power Ps is supplied to the system  60 , but no power is supplied from the system  60 , and thus all the charged power Pa of the storage battery  31  is carried by the generated power of the PV  41 , and thus Pad=Pa is established.
     In the state shown in  FIG. 6B , Ps=0, but the same as in  FIG. 6A , since no power is supplied from the system  60 , all the charged power Pa of the storage battery  31  is also carried by the generated power of the PV  41  in this case, and thus Pad=Pa is established.   

     Similar to  FIG. 6A  and  FIG. 6B ,  FIG. 7  is also a diagram schematically showing input/output of power between the storage battery PCS  32 , the PV-PCS  42 , the household load  50  shown in  FIG. 1  and the commercial power system  60 .  FIG. 7  shows a case where the storage battery  31  is charged and power is purchased from the system. The reference signs are the same as in  FIG. 6A  and  FIG. 6B , but here, Pb is the purchased power from the system  60 . When the reference numeral is included as the input/output to/from the system  60 , the purchased power is an input from the system  60 , and thus Pb=−Ps. 
     In  FIG. 7 , in a case of the purchased power Pb&lt;the charged power Pa, in the system including the storage battery PCS  32 , the PV-PCS  42 , the household load  50  and the system  60 , the power is supplied from the PV  41  and the system  60 , and thus, even if the storage battery  31  is charged, the part of the charged power Pa which is carried by the generated power of the PV  41  cannot be specified. Therefore, it is assumed that all of the purchased power Pb from the system  60  is used for charging the storage battery  31 , the generated power of the PV  41  is partially consumed by the household load  50 , and the rest is used for charging the storage battery  31 , and it is estimated that the part of the charged power of the storage battery  31  excluding the purchased power is carried by the generated power of the PV  41 . That is, Pad is calculated by Pad=Pa−Pb.
     In  FIG. 7 , even in the case of the purchased power Pb≥the charged power Pa, in the system including the storage battery PCS  32 , the PV-PCS  42 , the household load  50  and the system  60 , the power is supplied from the PV  41  and the system  60 , and thus, even if the storage battery  31  is charged, the part of the charged power Pa which is carried by the generated power of the PV  41  cannot be specified. Therefore, it is assumed that all the generated power of the PV  41  is consumed by the household load  50 , and only the purchased power is used for charging the storage battery  31 . That is, Pad=0.   

     With reference to  FIG. 8 , the calculation process of the charged power (self-consumption) of the storage battery is described.
     First, the management server  10  acquires the input/output power (Ps, Pb) to/from the system from the input/output power values to/from the system grasped in step S 201  (step S 2021 ). However, as described above, when the reference signs are included as the input/output to/from the system, Pb=−Ps. When the input/output current to/from the system and the system voltage are grasped as the input/output power index values, the input/output power to/from the system is calculated from these values, but when the power is acquired as the input/output power index values, the process in step S 2021  may be omitted.   

     Next, the management server  10  determines whether the output power (Ps) to the system is 0 or more (step S 2022 ).
     When the output power (Ps) to the system is 0 or more (“Yes” in step S 2022 ), the management server  10  calculates the charged power (self-consumption) (Pad) from Pad=Pa (step S 2023 ) and ends the charged power (self-consumption) calculation process.   

     When it is determined that the output power (Ps) to the system is less than 0 (“No” in step S 2022 ), the management server  10  compares the input power (Pb) from the system with the charged power (Pa) and determines whether Pb&lt;Pa (step S 2024 ). 
     When it is determined that Pb&lt;Pa (“Yes” in step S 2024 ), the management server  10  calculates the charged power (self-consumption) (Pad) by Pad=Pa−Pb (step S 2025 ) and ends the charged power (self-consumption) calculation process. 
     When it is determined that Pb&lt;Pa is not established (“No” in step S 2024 ), the management server  10  calculates the charged power (self-consumption) (Pad) by Pad=0 (step S 2026 ) and ends the charged power (self-consumption) calculation process.
     In this way, when the management server  10  ends the charged power (self-consumption) calculation process in step S 202 , the management server  10  proceeds to step S 203 .   

     Next, the management server  10  reads a first count value and a second count value associated with the grasped apparatus ID (hereinafter referred to as the target apparatus ID) from the management DB  12  onto the memory (step S 203 ). Moreover, initial values (values at the start of operation of the monitoring device  20 ) of the first count value and the second count value in the management DB  12  are both “0”. 
     Thereafter, the management server  10  determines whether the charged power (self-consumption) is equal to or less than a specified value (step S 204 ). Here, the specified value is a value set in advance as a threshold value for determining that there is a possibility that a problem has occurred in the PV  41  inside the power generation system  40 . The specified value may be a value stored in the management DB  12  for each power generation system  40  or a value set in the management server  10  and used in common for all the power generation systems  40 . Here, the specified value corresponds to the predetermined amount. 
     When the charged power (self-consumption) is higher than the specified value (“No” in step S 204 ), the management server  10  clears the first count value and the second count value associated with the target apparatus ID in the management DB  12  to “0” (step S 221 ). In addition, the management server  10  diagnoses that there is no abnormality in “the power generation system  40  combined with the power storage system  30  having the target apparatus ID” (hereinafter referred to as the target power generation system  40 ) (step S 222 ). Then, the management server  10  returns diagnosis result information in which the diagnosis result is set to the monitoring device  20  which is a transmission source of the charged power information received this time (step S 210 ), and then ends the charged power information analysis process. 
     On the other hand, when the charged power (self-consumption) is less than or equal to the specified value (“Yes” in step S 204 ), the management server  10  determines whether the charged power (self-consumption) is “0” (step S 205 ). Then, when the charged power (self-consumption) is not “0” (“No” in step S 205 ), the management server  10  adds “1” to the first count value (step S 206 ). The process in step S 206  is a process of adding “1” to each of the first count value on the memory and the first count value associated with the target apparatus ID in the management DB  12 . 
     The management server  10  which has ended the process in step S 206  determines whether the first count value is equal to or greater than a preset first threshold value (for example, “3”) (step S 207 ). Then, when the first count value is less than the first threshold value (“No” in step S 207 ), the management server  10  performs the same processes (the processes in steps S 222  and S 210 ) as in the case when the charged power (self-consumption) is more than the specified value, and then ends the charged power information analysis processing. Here, the first threshold value corresponds to a second predetermined number. 
     On the other hand, when the first count value is equal to or greater than the first threshold value (“Yes” in step S 207 ), the management server  10  diagnoses that there is an abnormality in the PV  41  of the power generation system  40  (step S 208 ). Next, the management server  10  stores the diagnosis result and the diagnosis date in the management DB  12  in association with the target apparatus ID (step S 209 ). Moreover, when the management server  10  stores a diagnosis result indicating that there is an abnormality in the PV  41  or the PV-PCS  42  of the power generation system  40  in the management DB  12  in association with a certain apparatus ID, a message indicating that there is an abnormality in the PV  41  or the PV-PCS  42  of the power generation system  40  is displayed on the web page for confirming the action status of the power storage system  30  having the apparatus ID. 
     The management server  10  which has ended the process in step S 209  returns diagnosis result information in which the diagnosis result is set to the monitoring device  20  which is the transmission source of the charged power information received this time (step S 210 ), and then ends the charged power information analysis process. 
     In addition, when the charged power (self-consumption) is “0” (“Yes” in step S 205 ), the management server  10  adds “1” to each of the first count value and the second count value (step S 231 ). In the process in step S 231 , “1” is also added to each count value associated with the target apparatus ID in the management DB  12  as in the process in step S 206 . 
     The management server  10  which has ended the process in step S 231  determines whether the second count value is equal to or greater than a preset second threshold value (for example, “3”) (step S 232 ). Then, when the second count value is less than the second threshold value (“No” in step S 232 ), the management server  10  performs the processes after step S 207  which are already described. Here, the second threshold value corresponds to a first predetermined number. 
     In addition, when the second count value is equal to or greater than the second threshold value (“Yes” in step S 232 ), the management server  10  diagnoses that there is an abnormality in the PV-PCS  42  of the power generation system  40  (step S 233 ). Then, after performing the processes in steps S 209  and S 210 , the management server  10  ends the charged power information analysis processing for the charged power information received this time. 
     Returning to  FIG. 4 , the description of the charged power information transmission process is continued.
     As is clear from the contents of the above-described charged power information analysis process ( FIG. 5 ), if the process in step S 103  is performed, the diagnosis result information is transmitted from the management server  10 . After receiving this diagnosis result information (step S 104 ), the control unit  22  determines whether the received diagnosis result information is information indicating that there is an abnormality in the power generation system  40  (the PV  41  or the PV-PCS  42 ) (step S 105 ).   

     Then, when the diagnosis result information is not the information indicating that there is an abnormality in the power generation system  40  (“No” in step S 105 ), the control unit  22  ends the charged power information transmission process without performing any particular process. In addition, when the diagnosis result information is the information indicating that there is an abnormality in the power generation system  40  (“Yes” in step S 105 ), the control unit  22  performs a notification process of displaying on the LCD  21  a message indicating that there is an abnormality in the PV  41  or the PV-PCS  42  according to the received diagnosis result information to notify the user, and ends the charged power information transmission process. 
     In this way, the presence or absence of abnormality of the power generation system  40  connected to the power receiving point the same as the power storage system  30  can be diagnosed without obtaining any information from the power generation system  40 . 
     Example 2 
     
         
         A monitoring system according to Example 2 of the disclosure is described below more specifically using the drawings. 
         Configurations and processes in common with Example 1 are denoted by the same reference signs, and detailed description thereof is omitted. 
         The schematic configuration and the usage form of the monitoring system according to the example, the schematic configuration of the controller  320  of the storage battery PCS  32 , and the schematic configuration of the monitoring device  20  are the same as those of Example 1. 
         In Example 1, the monitoring device  20  acquires charged power from the storage battery power sensor  33 , acquires input/output power values to/from the system from the storage battery PCS  32 , and transmits information in which these data and the self-apparatus ID are set to the management server  10 . Then, the charged power amount (self-consumption) is calculated by the management server  10 . In contrast, in the example, in the storage battery PCS  32 , the charged power amount (self-consumption) is calculated and transmitted to the management server  10  via the monitoring device  20 , and a charged power analysis process is performed. 
       
    
     &lt;Charged Power (Self-Consumption) Calculation Process, Charged Power Information Transmission Process and Charged Power Information Analysis Process&gt;
       FIG. 9  is a flowchart showing a procedure of the charged power (self-consumption) calculation process in the storage battery PCS  32  of the example.   First, the calculation/control portion  321  obtains charged power from the storage battery power sensor  33  (step S 111 ).   Next, the calculation/control portion  321  acquires input/output current values to/from the system from the current sensor  35  and measures a system voltage (step S 112 ).   Then, the calculation/control portion  321  calculates the charged power (self-consumption) from the charged power, the input/output current values, and the system voltage which are acquired (step S 113 ). The content of the calculation process of the charged power (self-consumption) is the same as that in Example 1 shown in  FIG. 8 .   Next, the calculation/control portion  321  transmits the charged power (self-consumption) calculated in step S 113  to the monitoring device  20  (step S 114 ), and ends the process. Here, the function of calculating the charged power (self-consumption) in the calculation/control portion  321  of the storage battery PCS  32  corresponds to a calculation part.   

       FIG. 10  is a flowchart showing a procedure of a charged power information transmission process in the monitoring device  20  of the example.
     First, the control unit  22  of the monitoring device  20  acquires the charged power amount (self-consumption) from the storage battery PCS  32  (step S 115 ).   Next, the control unit  22  transmits charged power information in a predetermined format in which the acquired charged power (self-consumption) and the self-apparatus ID are set to the management server  10  using the NIC  23  (step S 116 ).   Subsequent processes after step S 104  are the same as those in Example 1 shown in  FIG. 4 .   

     The management server  10  which has received the charged power information (self-consumption) starts a charged power information analysis process.  FIG. 11  is a flowchart showing a procedure of the charged power information analysis process of the example.
     First, the charged power (self-consumption) and the apparatus ID set in the received charged power information are grasped (step S 211 ). Subsequent processes after step S 203  are the same as those in Example 1 shown in  FIG. 5 .   

     In this way, the presence or absence of abnormality of the power generation system  40  connected to the power receiving point the same as the power storage system  30  can be diagnosed without obtaining any information from the power generation system  40 . 
     Example 3 
     A monitoring system according to Example 3 of the disclosure is described below more specifically using the drawings.
     Configurations and processes in common with Example 1 and 2 are denoted by the same reference signs, and detailed description thereof is omitted.   The schematic configuration and the usage form of the monitoring system according to the example, the schematic configuration of the controller  320  of the storage battery PCS  32 , and the schematic configuration of the monitoring device  20  are the same as those of Example 1.   In Example 1, the monitoring device  20  acquires charged power from the storage battery power sensor  33 , acquires input/output power values to/from the system from the storage battery PCS  32 , and transmits information in which these data and the self-apparatus ID are set to the management server  10 . Then, the charged power amount (self-consumption) is calculated by the management server  10 . In contrast, in the example, the charged power amount (self-consumption) is calculated in the monitoring device  20  and transmitted to the management server  10 , and the charged power analysis process is performed.   

     &lt;Charged Power (Self-Consumption) Calculation/Transmission Process, Charged Power Information Transmission Process and Charged Power Information Analysis Process&gt;
       FIG. 12  is a flowchart showing a procedure of a charged power (self-consumption) calculation/transmission process in the monitoring device  20  of the example.   Step S 101  and step S 102  are the same as those in Example 1 shown in  FIG. 4 .   The control unit  22  calculates charged power (self-consumption) from the acquired charged power and input/output power values (step S 121 ). The content of the calculation process of the charged power (self-consumption) is the same as that in Example 1 shown in  FIG. 8 .   Next, the control unit  22  transmits charged power information in a predetermined format in which the calculated charged power (self-consumption) and the self-apparatus ID are set to the management server  10  using the NIC  23  (step S 122 ).   Processes after step S 104  are the same as those in Example 1 shown in  FIG. 4 . Here, the function of calculating the charged power (self-consumption) in the control unit  22  corresponds to a calculation part.   The charged power analysis process in the management server  10  is the same as that in Example 2 shown in  FIG. 11 .   

     In this way, the presence or absence of abnormality of the power generation system  40  connected to the power receiving point the same as the power storage system  30  can be diagnosed without obtaining any information from the power generation system  40 . 
     Moreover, in the following, in order to make it possible to compare the configuration requirements of the disclosure with the configuration of the examples, the configuration requirements of the disclosure are described with reference signs in the drawings. 
     &lt;Invention 1&gt; 
     
         
         A monitoring system, including: 
         a calculation part ( 10 ,  22 ,  321 ) for calculating, based on first charged power index values indicating charged power of an power storage system ( 30 ) and input/output power index values indicating input/output power from a power receiving point ( 55 ) to which the power storage system ( 30 ) is connected to a system, second charged power index values indicating power charged by generated power of a power generation system connected to the power receiving point of the charged power of the power storage system; and 
         a diagnosis part ( 10 ) for diagnosing presence or absence of abnormality of the power generation system ( 40 ) based on the second charged power index values calculated by the calculation part.