Patent Publication Number: US-2023163692-A1

Title: Power converting system

Description:
RELATED APPLICATIONS 
     This application claims priority to China Application Serial Number 202111375867.1 filed Nov. 19, 2021 and China Application Serial Number 202211369741.8 filed Nov. 3, 2022, which is herein incorporated by reference. 
     BACKGROUND 
     Field of Invention 
     The present disclosure relates to a converting device. More particularly, the present disclosure relates to a power converting system. 
     Description of Related Art 
     Solar battery charger system nowadays is usually constructed by multiple independent sub-systems. Photovoltaic (PV) energy storage system usually includes PV inverter and battery inverter to achieve energy conversion between new energy generation and energy storage through AC couple. Or Photovoltaic (PV) energy storage system achieves energy conversion between new energy generation and energy storage through DC couple. Electric vehicle (EV) charger is also connected to AC grid directly. 
     The Photovoltaic (PV) energy storage system and the electric vehicle charger are all independent devices. Since communication ports of each of the independent devices do not have a uniform standards and a uniform communication protocol, it is hard to communicate among the devices, such that it is not easy to achieve an electricity management among the whole system. In addition, each independent system needs independent grid-connected capacity, so the capacity of the AC ports will be not enough; and the installation cost and the maintenance cost are high. 
     SUMMARY 
     One aspect of the present disclosure is to provide a power converting system. The power converting system includes a power converting device, a protection device, and a charging device. The power converting device is coupled to a first power source and a second power source. The protection device is coupled to the power converting device, a load, and a grid, and configured to switch electrical connections among the power converting device, the load, and the grid. The charging device is coupled to the power converting device and a third power source. The power converting device charges the third power source through the charging device, or receives electricity of the third power source through the charging device. Select at least one power source of the first power source, the second power source, the third power source and the grid to provide electricity to the load according to multiple preset modes. 
     It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the disclosure as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings, 
         FIG.  1    depicts a schematic diagram of a power converting system according to one embodiment of the present disclosure; 
         FIG.  2    depicts a schematic diagram of a protecting device of the power converting system shown in  FIG.  1    according to one embodiment of the present disclosure; 
         FIG.  3    depicts a schematic diagram of operating a power converting system according to one embodiment of the present disclosure; 
         FIG.  4    depicts a schematic diagram of operating a power converting system according to one embodiment of the present disclosure; 
         FIG.  5    depicts a schematic diagram of operating a power converting system according to one embodiment of the present disclosure; 
         FIG.  6    depicts a schematic diagram of operating a power converting system according to one embodiment of the present disclosure; 
         FIG.  7    depicts a schematic diagram of a power converting system according to one embodiment of the present disclosure; 
         FIG.  8    depicts a schematic diagram of a power converting device of the power converting system shown in  FIG.  7    according to one embodiment of the present disclosure; 
         FIG.  9    depicts a schematic diagram of a power converting system according to one embodiment of the present disclosure; 
         FIG.  10    depicts a schematic diagram of a power converting device of the power converting system shown in  FIG.  9    according to one embodiment of the present disclosure; 
         FIG.  11    depicts a schematic diagram of a power converting device of the power converting system shown in  FIG.  9    according to one embodiment of the present disclosure; 
         FIG.  12    depicts a schematic diagram of a power converting device of the power converting system shown in  FIG.  9    according to one embodiment of the present disclosure; 
         FIG.  13    depicts a schematic diagram of a power converting device of the power converting system shown in  FIG.  12    according to one embodiment of the present disclosure; and 
         FIG.  14    depicts a schematic diagram of a power converting device of the power converting system shown in  FIG.  9    according to one embodiment of the present disclosure. 
     
    
    
     According to the usual mode of operation, various features and elements in the figures have not been drawn to scale, which are drawn to the best way to present specific features and elements related to the present disclosure. In addition, among the different figures, the same or similar element symbols refer to similar elements/components. 
     DESCRIPTION OF THE EMBODIMENTS 
     To make the contents of the present disclosure more thorough and complete, the following illustrative description is given with regard to the implementation aspects and embodiments of the present disclosure, which is not intended to limit the scope of the present disclosure. The features of the embodiments and the steps of the method and their sequences that constitute and implement the embodiments are described. However, other embodiments may be used to achieve the same or equivalent functions and step sequences. 
     Unless otherwise defined herein, scientific and technical terminologies employed in the present disclosure shall have the meanings that are commonly understood and used by one of ordinary skill in the art. Unless otherwise required by context, it will be understood that singular terms shall include plural forms of the same and plural terms shall include the singular. Specifically, as used herein and in the claims, the singular forms “a” and “an” include the plural reference unless the context clearly indicates otherwise. 
       FIG.  1    depicts a schematic diagram of a power converting system  100  according to one embodiment of the present disclosure. As shown in the figure, the power converting system  100  includes a power converting device  110 , a protection device  120 , and a charging device  130 . The power converting device  110  is electrically connected to the protection device  120  and the charging device  130 . 
     The power converting device  110  includes multiple input/output ports. Two input/output ports of the power converting device  110  are electrically connected to a first power source  200  and a second power source  300 . Besides, another input/output port of the power converting device  110  is electrically connected to the protection device  120 , and the power converting device  110  is electrically connected to a grid  400  and a load  500  through the protection device  120 . In addition, still another input/output port of the power converting device  110  is electrically connected to the charging device  130 , and the power converting device  110  is electrically connected to a movable energy storage device  600  through the charging device  130 . In some embodiments, the input/output port can include plural input/output terminals. 
     For example, the first power source  200  can be a photovoltaics panel. Therefore, the first power source  200  is configured to convert solar energy into electrical energy, and provide the electrical energy to the power converting device  110 . The second power source  300  can be energy storage battery. Therefore, the second power source  300  is configured to store electrical energy provided by the power converting device  110 , and provide electrical energy to the power converting device  110  through the second power source  300  if necessary. In some operation modes, the second power source may be a power load for receiving and storing electricity. 
     As shown in  FIG.  2   , the protection device  120  includes a switch  121 , a transformer  123 , and a safe guard  125 . The switch  121  can be a contactor or a relay. Therefore, the switch  121  can be configured to control a switch state among the power converting device  110 , the grid  400 , and the load  500 . The transformer  123  can be an isolation transformer or an auto transformer, so as to perform a voltage-typed conversion. The safe guard  125  can be an overcurrent protection device or an electrical leakage protection device. 
     As shown in  FIG.  1   , the charging device  130  can be a charging gun, and the movable energy storage device  600  can be an electric vehicle. Therefore, the movable energy storage device  600  can be charged or discharged through the charging device  130 . Specifically, the movable energy storage device  600  includes a second converter  610  and a third power source  620 . The third power source  620  can be an energy storage battery. The charging device  130  provides electricity to the second converter  610 , and the second converter  610  converts electricity and stores it in the third power source  620 . In some operation modes, the third power source may be a power load for receiving and storing electricity. 
     In one embodiment, the power converting device  110  includes a first converter  111 , a controller  113 , a sensor  115 , and a protector  117 . The first converter  111  is electrically connected to the controller  113 , the sensor  115 , and the protector  117 . The controller  113  is electrically connected to the sensor  115  and the protector  117 . 
     For example, the first converter  111  includes multiple input/output ports. The first converter  111  can be configured to perform a DC/DC conversion, a DC/AC conversion, or an AC/DC conversion. The controller  113  is configured to control the whole system. For instance, the controller  113  can communication with the charging device  130  for controlling the movable energy storage device  600  to charge or discharge, or perform a protection function. The sensor  115  can be a current sampler, a voltage sampler, or a combination of the current sampler and the voltage sampler. The sensor  115  can detect the current, the voltage, and the power signal of the movable energy storage device  600 , and provide the signals detected to the controller  113  for calculating the power of the movable energy storage device  600 . Besides, the sensor  115  can be also configured to detect whether it is in an island state. The protector  117  can be a breaker, and can be configured to perform an overcurrent protection and an electrical leakage protection. The protector  117  can be used as equipment for activating the protection of the system. For example, when the sensor  115  detects the island state, the protector  117  will be activated to turn off a connection between the power converting system  100  and the grid  400 . 
     As described above, the power converting system  100  of the present disclosure assembles input/output ports of the first converter  111  and the charging device  130  together. Therefore, house hold power distribution capacity does not have to be extended, such that the installation cost and the maintenance cost can be reduced. In addition, since multiple input/output ports are assembled, the volume and the weight can be decreased so as to achieve better thermal management, simpler connection, and so on. Besides, the power converting system  100  of the present disclosure includes the sensor  115  to detect the input/output of the charging device  130 , so as to satisfy requirements of the grid  400  to electricity consumption, electricity generation, and support. 
     In one embodiment, the power converting device  110  is a multi-port converting controller. For example, the power converting device  110  is a four port converting controller. A port is connected to the first power source  200 , a port is connected to the second power source  300 , a port is connected to the charging device  130 , and a port is connected to the protection device  120 . The above-mentioned ports can be disposed in the power converting device  110  according to the application and the real system construction. The power converting device  110  can be used to power convert, control direction of the power flow, communicate with the inner system, communicate with the outer system, protect the system, and power manage. 
     In one embodiment, the controller  113  is a controlling and communicating core of the whole power converting system  100 , which is used to implement a power conversion control, a communication with the inner system, a communication with the outer system, and a power management. The power conversion control can obtain the voltage and the current of the first power source  200  (e.g., photovoltaics panel) to calculate the power variation and the voltage variation so as to achieve the Maximum Power Point Tracking (MPPT) of the port of the first power source  200 . Simultaneously, the power conversion control can obtain the voltage and the current of the first power source  200  (e.g., photovoltaics panel) to calculate the powervariation and the voltage variation so as to control active power and reactive power of the alternative current to achieve the power factor control and the frequency control. The controller  113  can communicate with the charging device  130  and the movable energy storage device  600  for determining whether the movable energy storage device  600  (e.g., electric vehicle) operates at a charge mode or a discharge mode. The controller  113  can obtain the sampling signal of the sensor  115 , and calculate the power of the movable energy storage device  600 . The controller  13  can communicate with the protection device  120 , and control the power converting device  110  to switch between on-grid work mode and off-grid work mode. The controller  113  can be connected to Could through a router to achieve remote data feedback, monitor, and software update. Those functions can be achieved by one or multiple controllers. 
     In one embodiment, the charging device  130  includes a power converter, a controller, a relay or a contractor, a detector and a communicator. The charging device  130  can be an AC charger-typed connector. The power converter is a power converting portion to achieve DC/DC conversion function, for example, an auxiliary power. The power converter can be a power converting portion to achieve DC/AC conversion function, for example, the second converter  610  can be disposed in the charging device  130 . The controller can control the power converter, and the communicator can perform a communication between the movable energy storage device  600  and the controller  113 . The relay or a contactor can connect or cut off a connection between the power converting device  110  and the movable energy storage device  600 . The detector is used to detect related signals of the charging device  130 , and the related signals includes a voltage signal, a current signal, a power signal, and a temperature signal. 
     The power converting system  100  of the present disclosure can provide the best power management in any state. The power converting system  100  of the present disclosure can select at least one power source of the first power source, the second power source, the third power source and the grid to provide electricity to the load according to multiple preset modes. The above-mentioned power management will be described in detail in the embodiments of  FIG.  3    to  FIG.  6   . 
       FIG.  3    depicts a detailed schematic diagram of operating a power converting system  100  according to one embodiment of the present disclosure. In this embodiment, the power converting system  100  works in a first mode. The first mode is that the power converting system  100  works during daytime, and the grid  400  can provide electricity. That is to say, the power converting system  100  is in an on-grid work mode and the power of the first power source  200  (e.g., photovoltaics panel) is higher. The power converting device  110  controls the first power source  200  to charge the second power source  300  (e.g., energy storage battery) and the third power source  620  (e.g., energy storage battery), and provide electricity to the load  500 . If there is still additional electricity, it can be provided to the grid  400 . If the need of the load  500  cannot be satisfied, the grid  400  can provide electricity to the load  500 . 
     If additional electricity cannot be used by the load  500 , cannot be stored in the second power source  300  (e.g., energy storage battery) and the third power source  620  (e.g., energy storage battery), and cannot be provided to the grid  400 , the power converting device  110  will limit the output power of the first power source  200  (e.g., photovoltaics panel). 
       FIG.  4    depicts a detailed schematic diagram of operating a power converting system  100  according to one embodiment of the present disclosure. In this embodiment, the power converting system  100  works in a second mode. The second mode is that the power converting system  100  works at night, and the grid  400  can provide electricity. That is to say, the power converting system  100  is in an on-grid work mode and the first power source  200  (e.g., photovoltaics panel) cannot generate electricity. The controller  113  collects voltage signals and current signals of all power ports of the power converting system  100  for obtaining related states, thereby adopting suitable electricity management. For example, electricity stored in the second power source  300  (e.g., energy storage battery) and the third power source  620  (e.g., energy storage battery) can be provided to the load  500 . If the need of the load  500  cannot be satisfied, the grid  400  can provide electricity to the load  500 . 
     In addition, if the power need by the load  500  is not high, the second power source  300  (e.g., energy storage battery) has the priority to provide electricity to the load  500 , so as to make sure that the movable energy storage device  600  (e.g., electric vehicle) always has electricity for using. If the movable energy storage device  600  shall be used tomorrow and electricity of the movable energy storage device  600  is lacking, the movable energy storage device  600  can be charged by the grid  400  during off-peak time so as to achieve greater benefits. 
       FIG.  5    depicts a detailed schematic diagram of operating a power converting system  100  according to one embodiment of the present disclosure. In this embodiment, the grid  400  stops providing electricity, so the power converting system  100  works in an off-grid work mode. At this time, the controller  113  detects an island state through the sensor  115 , and controls the protector  117  to turn off a connection between the power converting system  100  and the grid  400 . The way to detect the island state can be active island detection or inactive island detection. In addition, the way to detect the island state can be performed through obtaining the voltage and the frequency of the grid  400 . 
     Besides, the protection device  120  can switch the power converting system  100  from an on-grid work mode to an off-grid work mode through the switch  121  in  FIG.  2   . The switch between the on-grid work mode and the off-grid work mode not only can be performed by the power converting system  100  actively, but also can be performed manually. After accessing the off-grid work mode, the power converting system  100  can continuously provide electricity to the load  500  for the need of emergency electricity and continuous electricity, for example, emergency lighting, refrigerator, and so on. 
     In some embodiments, the power converting system  100  works in a third mode. The third mode is that the power converting system  100  works at daytime and the grid  400  stops providing electricity. That is to say, the power converting system  100  is in an off-grid work mode and the power of the first power source  200  (e.g., photovoltaics panel) is high. The power converting device  110  controls the first power source  200  to provide electricity to the load  500 . If there is still additional electricity, the second power source  300  (e.g., energy storage battery) and the third power source  620  (e.g., energy storage battery) can be charged selectivity. If additional electricity is not used by the load  500 , and cannot be stored in the second power source  300  and the third power source  620 , the power converting device  110  will limit the output power of the first power source  200 . Besides, if the power of the first power source  200  is not enough to provide electricity to the load  500 , the second power source  300  and/or the third power source  620  can be used to provide electricity to the load  500 . 
       FIG.  6    depicts a detailed schematic diagram of operating a power converting system  100  according to one embodiment of the present disclosure. In this embodiment, the power converting system  100  works in a fourth mode. The fourth mode is that the power converting system  100  works at night, and the grid  400  stops providing electricity. That is to say, the power converting system  100  is in an off-grid work mode and the first power source  200  (e.g., photovoltaics panel) cannot generate electricity. The second power source  300  (e.g., energy storage battery) and/or the third power source  620  (e.g., energy storage battery) can provide electricity to the load  500 . If the need for the power of the load  500  is not high, the controller  113  will control the second power source  300  to provide electricity to the load  500  so as to ensure that the movable energy storage device  600  (e.g., electric vehicle) has electricity for usage at any time. 
       FIG.  7    depicts a schematic diagram of a power converting system  100  according to one embodiment of the present disclosure. Compared to the power converting system  100  in  FIG.  1   , the sensor  115  of the power converting system  100  in  FIG.  7    is not electrically connected to the charging device  130  in a direct way. At this time, the sensor  115  obtains signals at a public point of the first converter  111  and the charging device  130  indirectly, and the related information of the charging device  130  can be obtained through calculation. 
       FIG.  8    depicts a schematic diagram of the first converter  111  of the power converting device  110  of the power converting system  100  shown in  FIG.  7    according to one embodiment of the present disclosure. As shown in the figure, the first converter  111  of the power converting device  110  includes a first sub-converter  112 , a second sub-converter  114 , a DC bus  116 , and a third sub-converter  118 . 
     In one embodiment, the first sub-converter  112  is coupled to the first power source  200  and the DC bus  116 , and configured to receive and adjust a power provided by the first power source  200 . For example, the first sub-converter  112  can be a unidirectional DC-DC converter, such as a boost converter, and the first power source  200  can be a DC power source. The unidirectional DC-DC converter  112  is configured to receive the power provided by the DC power source  200  and convert a port voltage of the DC power source  200  to fit the voltage of the DC bus  116 . 
     In one embodiment, the second sub-converter  114  is coupled to the second power source  300  and the DC bus  116 . The second sub-converter  114  is configured to receive and adjust a power provided by the second power source  300 , or configured to charge the second power source  300 . For example, the second sub-converter  114  can be a bidirectional DC-DC converter, such as a Dual Active Bridge (DAB) series resonance converter, and the second power source  300  can be a DC power source. The bidirectional DC-DC converter  114  is configured to receive the power provided by the DC power source  300  and convert a port voltage of the DC power source  300  to fit the voltage of the DC bus  116 , or configured to charge the DC power source  300 . The third sub-converter  118  is coupled to the DC bus  116 , and the third sub-converter  118  is coupled to the protection device  120  through the sensor  115  and the protector  117 . For example, the third sub-converter  118  can be a bidirectional DC-AC converter. The bidirectional DC-AC converter may be configured to receive the AC power from the grid  400  and convert the AC power into a DC power. The DC power obtained can be used to charge the second power source (e.g., high-voltage batteries) and/or the movable energy storage device (e.g., electric vehicle). The bidirectional DC-AC converter may be configured to receive the DC power from at least one DC power source and convert the DC power into a AC power. The AC power obtained can be provided to the grid  400  or the load  500 , or be used to charge the movable energy storage device (e.g., electric vehicle). 
       FIG.  9    depicts a schematic diagram of a power converting system  100  according to one embodiment of the present disclosure. As shown in  FIG.  9   , the power converting device  110  of the power converting system  100  includes plural input/output ports. An input/output port of the power converting device  110  is electrically connected to the first power source  200 , an input/output port of the power converting device  110  is electrically connected to the second power source  300 . In addition, another input/output port of the power converting device  110  is electrically connected to the protection device  120 , and the power converting device  110  is electrically connected to the grid  400  and the load  500  through the protection device  120 . Besides, still another input/output port of the power converting device  110  is electrically connected to the charging device  130 , and the power converting device  110  is electrically connected to the movable energy storage device  600  through the charging device  130 . 
     For example, the first power source  200  can be Photovoltaics (PV) device. Therefore, the first power source  200  can be configured to convert solar energy into electrical energy, and provide the electrical energy to the power converting device  110 . The second power source  300  can be an energy storage battery. Therefore, the second power source  300  can be configured to store electrical energy provided by the power converting device  110 , and provide electrical energy to the power converting device  110  when needed. 
     The charging device  130  in  FIG.  1    is coupled to the protector  117 . For example, in one embodiment, the charging device  130  is coupled to an AC side of the power converting device  110 , and is electrically connected to the protection device  120  through the protector  117 , and further electrically connected to the grid  400  through the protection device  120 . The charging device  130  in  FIG.  9    is coupled to the DC bus  116  of the power converting device  110 . Therefore, the third power  620  in  FIG.  9    does not need the second converter  610  in  FIG.  1   . Accordingly, the controller  113  of the power converting system  100  can detect current, voltage, and/or power in the DC bus  116  to control a state of the port connected to the charging device  130 , thereby satisfying the requirements of the movable energy storage device  600 . In this embodiment, the charging device  130  includes a power converter, a controller, a relay or contactor, a detector, and a communicator. The charging device  130  can be a DC charging gun. The power converter is a part of the power conversion. The power converter can implement DC/DC conversion, for example supplying auxiliary power. 
     In the prior art, the charging device is coupled to a grid through a distribution board. In the present disclosure, the charging device  130  is coupled to AC side or DC bus of the power converting system  110 , and the charge equipment (for example, electric vehicle) does not need to use grid-connected capacity independently. The power converting system of the present disclosure can integrate solar energy, storage energy, and charge energy. When introducing the charging equipment, the solar energy and energy storage equipment will be considered, so as to enhance usage efficiency of renewable energy. 
       FIG.  10    depicts a schematic diagram of the first converter  111  of the power converting device  110  of the power converting system  100  shown in  FIG.  9    according to one embodiment of the present disclosure. As shown in  FIG.  10   , the first converter  111  of the power converting device  110  incudes a first sub-converter  112 , a second sub-converter  114 , a DC bus  116 , a third sub-converter  118 , and a fourth sub-converter  119 . 
     Compared with  FIG.  8   , the first converter  111  of the power converting device  110  in  FIG.  10    further includes a fourth sub-converter  119 . The fourth sub-converter  119  is coupled to the DC bus  116  and the charging device  130 . The fourth sub-converter  119  receives a power provided by the third power source  620  through the charging device  130  and converts the power provided by the third power source  620  to fit the DC bus  116 , or charges the third power source  620  through the charging device  130 . For example, the fourth sub-converter  119  can be a bidirectional DC-DC converter, such as a DAB series resonance converter, and the third power source  620  can be DC power source. The bidirectional DC-DC converter  119  is configured to receive the power provided by the DC power source  620 , or configured to charge the DC power source  620 . Therefore, the third power source  620  in  FIG.  10    does not need the second converter  610  in  FIG.  1    to transform DC electrical energy into AC electrical energy. 
       FIG.  11    depicts a schematic diagram of the first converter  111  of the power converting device  110  of the power converting system  100  shown in  FIG.  9    according to one embodiment of the present disclosure. Compared with  FIG.  10   , the first converter  111  of the power converting device  110  in  FIG.  11    further includes a sensor  121 . The sensor  121  is coupled to the DC bus  116 . The sensor  121  can be configured to at least detect the state of the DC bus  116 . 
       FIG.  12    depicts a schematic diagram of the first converter  111  of the power converting device  110  of the power converting system  100  shown in  FIG.  9    according to one embodiment of the present disclosure. Compared with  FIG.  10   , the power converting device  110  in  FIG.  12    does not need the second sub-converter  114 , and the power of the second power  300  can be transmitted to the DC bus  116  directly. 
       FIG.  13    depicts a schematic diagram of the first converter  111  of the power converting device  110  of the power converting system  100  shown in  FIG.  12    according to one embodiment of the present disclosure. As shown in  FIG.  13   , the first sub-converter  112  is coupled to the first power source  200 . The DC bus  116  can be directly coupled to the second power source  300 . The third sub-converter  118  is coupled to the DC bus  116 , and the third sub-converter  118  is coupled to the protection device  120  through the sensor  115  and the protector  117 . The fourth sub-converter  119  is coupled to the DC bus  116  and the charging device  130 . 
     In one embodiment, the controller  113  of the first converter  111  of the power converting device  110  can be implemented by plural controllers, for example, controllers  1111 ,  1112 ,  1113 . The controller  1111  can be configured to collect signals of nodes N 1 , N 2 , N 3  for controlling the first sub-converter  112  and the third sub-converter  118 . The controller  1112  can be configured to collect signals of nodes N 4 , N 5  for controlling the fourth sub-converter  119 . The controller  1113  is mainly configured to communicate with other devices. For example, the controller  1113  collects signals of the second power source  300  and the third power source  620 , and communicates with the controller  1111  and the controller  1112 . 
     In one embodiment, the first converter  111  of the power converting device  110  sets the sensor at the node N 2  or the node N 5 . The sensor at the node N 2  or the node N 5  is configured to detect signals of the DC bus  116 , and transmit the signals detected to the controllers  1111 ,  1112 . Meanwhile, the third sub-converter  118  and the fourth sub-converter  119  can share the sensor so as to reduce the cost of the hardware. 
     When the sensor is at the node N 2 , the signals detected by the sensor are transmitted to the controller  1112  through a long distance, and as a result, the signals are interfered during the transmitting process. When the sensor is at the node N 5 , the signals detected by the sensor are transmitted to the controller  1111  through a long distance, and as a result, the signals are interfered during the transmitting process. In another embodiment, the first converter  111  of the power converting device  110  sets the sensors  122 ,  123  at the node N 2  and the node N 5 , and each of the sensors  122 ,  123  is configured to detect the signals of the DC bus  116 . The sensor  122  at the node N 2  only needs to transmit the signals detected to the controller  1111  nearby, and the sensor  123  at the node N 5  only needs to transmit the signals detected to the controller  1112  nearby, thereby avoiding interference during the transmitting process. 
       FIG.  14    depicts a schematic diagram of the power converting device  110  of the power converting system  100  shown in  FIG.  9    according to one embodiment of the present disclosure. As shown in  FIG.  14   , the power converting system includes a first sub-converter  112 , a DC bus  116 , a third sub-converter  118 , and a fourth sub-converter  119 . The first power source  200  can be Photovoltaics (PV) panel, the second power source  300  can be energy storage batteries (BAT), and the grid  400  can be single-phase AC grid. The charging device  130  can be a connector coupled to the movable energy storage device (such as electric vehicle) and the fourth sub-converter  119 . The first sub-converter  112  can be a unidirectional DC-DC converter, for example, a boost converter. The DC bus  116  can be bus capacitors C bus . The third sub-converter  118  can be a bidirectional DC-AC inverter. The fourth sub-converter  119  can be a bidirectional DC-DC converter, for example, a Dual-Active Bridge Series Resonant Converter (DAB-SRC). 
     The power converting system of the present disclosure can perform a compensation to the output of the charging device according to the signals detected. Besides, the controllers of the power converting device controls the multiple converters according to the signals detected so as to achieve the best power management. In addition, since input/output ports of the power converting device and the charging device are assembled together, volume and weight of the power converting system is reduced so as to achieve better thermal management, simpler connection, and so on. 
     Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the present disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims and their equivalents.