Optical storage all-in-one machine device

Abstract

The invention discloses an optical storage all-in-one machine device which comprises a multi-path optical storage all-in-one machine set, an acquisition unit, a monitoring unit and a master control unit. The system is formed by cascading a plurality of light-storage integrated full-bridge sub-modules, adopts a cascading direct-hanging grid-connected converter structure, and is directly connected with a power grid in a high-voltage direct-hanging mode; the acquisition unit is respectively connected with each optical storage integrated unit and the general control unit, and is used for acquiring power grid measured data and sending the power grid measured data to the general control unit; the monitoring unit is respectively connected with each optical storage all-in-one machine sub-module and the master control unit, and is used for monitoring the state information of each optical storage all-in-one machine sub-module and sending the state information to the master control unit; the general control unit adopts a network construction type control strategy to realize a power exchange function with a power grid and a function of actively supporting voltage and frequency of the power grid.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation, and in particular to a photovoltaic power generation device. Background Art

[0002] With the continuous advancement of my country's new energy technology, the proportion of new energy installed capacity and power generation has increased year by year. New energy with power electronic converters as grid-connected interface is gradually becoming the main power source for my country to build a new power system.

[0003] At present, a large number of new energy generating sets and energy storage devices almost all use grid-following converters. Since grid-following converters have no mechanical rotor, require the grid to provide a stable frequency and rely on the grid voltage, they only have basic power conversion functions and lack the ability to actively support. Therefore, grid-following converters cannot provide inertial response, frequency regulation and voltage control capabilities similar to synchronous generators, making it difficult for new energy generating equipment to provide effective frequency and voltage support in the event of grid failure or disturbance, further exacerbating the operating risks of the power system. Summary of the invention

[0004] The present invention provides an integrated photovoltaic and storage device, which solves the problem that a grid-following converter cannot provide effective frequency and voltage support capabilities, avoids the synchronization risk of multiple machines running in parallel, realizes active regulation of the frequency and voltage of the power grid, and plays a role in actively supporting the power grid.

[0005] According to one aspect of the present invention, a light-storage integrated device is provided, the device comprising: a multi-channel light-storage integrated device set, a collection unit, a monitoring unit and a master control unit; wherein,

[0006] The multi-channel photovoltaic and storage integrated unit includes 3 photovoltaic and storage integrated units, each photovoltaic and storage integrated unit includes multiple cascaded photovoltaic and storage integrated unit sub-modules, and each photovoltaic and storage integrated unit is directly connected to the power grid;

[0007] The acquisition unit is connected to each photovoltaic storage integrated unit and the master control unit respectively, and is used to collect the measured data of the power grid and send the measured data of the power grid to the master control unit;

[0008] The monitoring unit is connected to each integrated optical storage machine submodule and the main control unit respectively, and is used to monitor the status information of each integrated optical storage machine submodule and send the status information to the main control unit;

[0009] The master control unit is connected to each photovoltaic-storage integrated machine sub-module respectively, and is used to determine the number of sub-modules in abnormal state based on status information; when the number of sub-modules in abnormal state is greater than a preset number threshold, all photovoltaic-storage integrated machine sub-modules are controlled to shut down; when the number of sub-modules in abnormal state is less than or equal to the preset number threshold, the active power and reactive power of the photovoltaic-storage integrated machine sub-modules in normal state are adjusted according to the actual measured data of the power grid.

[0010] The photovoltaic-storage integrated device provided in an embodiment of the present invention comprises a multi-channel photovoltaic-storage integrated machine set, a collection unit, a monitoring unit and a main control unit; wherein the multi-channel photovoltaic-storage integrated machine set comprises three photovoltaic-storage integrated machine sets, each photovoltaic-storage integrated machine set comprises a plurality of cascaded photovoltaic-storage integrated machine sub-modules, and each photovoltaic-storage integrated machine set is directly connected to a power grid; the collection unit is respectively connected to each photovoltaic-storage integrated machine set and the main control unit, and is used for collecting actual measured data of the power grid, and sending the actual measured data of the power grid to the main control unit; the monitoring unit is respectively connected to each photovoltaic-storage integrated machine sub-module and the main control unit, and is used for monitoring the status information of each photovoltaic-storage integrated machine sub-module, and sending the status information to the main control unit; the main control unit is respectively connected to each photovoltaic-storage integrated machine sub-module, and is used for determining the number of sub-modules in an abnormal state according to the status information; when the number of sub-modules in an abnormal state is greater than a preset number threshold, all photovoltaic-storage integrated machine sub-modules are controlled to shut down; when the number of sub-modules in an abnormal state is less than or equal to the preset number threshold, the active power and reactive power of the photovoltaic-storage integrated machine sub-modules in a normal state are adjusted according to the actual measured data of the power grid. In the above technical scheme, each photovoltaic storage integrated machine submodule is cascaded to form a photovoltaic storage integrated unit, and multiple photovoltaic storage integrated units are connected together through bridge arms and connected to the power grid to form a cascaded direct-mounted grid-connected converter. Based on the cascaded direct-mounted grid-connected converter, a corresponding grid-connected control strategy can be adopted, which provides important support for the subsequent power exchange function with the power grid and the function of actively supporting the voltage and frequency of the power grid based on the structure. Based on the structure of the cascaded direct-mounted grid-connected converter, and based on the acquisition unit's acquisition of the measured data of the power grid and the monitoring unit's monitoring of the working status of each photovoltaic storage integrated machine submodule, the measured data of the power grid input to the power grid can be determined in real time, and the active power and reactive power that each photovoltaic storage integrated machine submodule should output to the power grid can be determined and controlled according to the measured data of the power grid, so as to realize the power exchange function with the power grid and the function of actively supporting the voltage and frequency of the power grid. The above technical scheme effectively solves the problem that the grid-following converter cannot provide effective frequency and voltage support capabilities, avoids the risk of synchronization of multiple machines in parallel operation, realizes the active regulation of the frequency and voltage of the power grid, and plays a role in actively supporting the power grid.

[0011] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 A schematic diagram of the structure of an integrated optical storage device provided by an embodiment of the present invention;

[0014] Figure 2 A schematic diagram of a working method of the integrated optical storage device provided by an embodiment of the present invention;

[0015] Figure 3 A structural example diagram of a light-storage integrated machine submodule in a light-storage integrated machine device provided in an embodiment of the present invention;

[0016] Figure 4 Another structural example diagram of an integrated optical storage device submodule in an integrated optical storage device provided by an embodiment of the present invention;

[0017] Figure 5 An example flow chart of a working method of an integrated optical storage device submodule in an integrated optical storage device provided by an embodiment of the present invention;

[0018] Figure 6 Another example flow chart of the working method of the integrated optical storage device submodule in the integrated optical storage device provided by the embodiment of the present invention;

[0019] Reference numerals:

[0020] 10-photovoltaic and energy-storage integrated unit; 101-photovoltaic and energy-storage integrated unit submodule; 1011-photovoltaic unit; 10111-photovoltaic module; 10112-unidirectional DC / DC converter; 1012-energy storage unit; 10121-energy storage battery; 10122-bidirectional DC / DC converter; 1013-submodule monitoring unit; 10131-submodule capacitor; 10132-capacitor voltage monitor; 10133-battery SOC monitor; 1014-submodule control unit; 10141-first controller; 10142-second controller; 1015-full control circuit; 1016-external connection port; 20-collection unit; 30-monitoring unit; 40-master control unit; A-grid; K-bypass switch; S1 / S2 / S3 / S4-fully controlled power electronic power devices. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] At present, the grid-connected new energy-energy storage integrated machine has received much attention in the past two years due to its multi-time scale power support capability. However, the current energy storage integrated machine mostly uses multiple machines in parallel to achieve large-capacity power generation, which is equivalent to connecting multiple grid-connected converters in parallel to the grid. In this way, there will be synchronization problems when multiple machines are connected in parallel, and in severe cases, circulating current and oscillation will occur.

[0024] Figure 1 This is a schematic diagram of the structure of a photovoltaic storage device provided by an embodiment of the present invention. This embodiment is suitable for providing output energy that actively supports the voltage and frequency of the power grid. Figure 1 As shown, the device includes: a multi-channel optical storage integrated unit, a collection unit 20, a monitoring unit 30 and a master control unit 40; wherein,

[0025] The multi-channel photovoltaic-storage integrated unit includes three photovoltaic-storage integrated units 10 , each photovoltaic-storage integrated unit 10 includes a plurality of cascaded photovoltaic-storage integrated unit sub-modules 101 , and each photovoltaic-storage integrated unit 10 is directly connected to the power grid A.

[0026] Specifically, each integrated photovoltaic and storage unit 10 includes a plurality of cascaded integrated photovoltaic and storage submodules 101, and one end of each integrated photovoltaic and storage unit 10 is connected to the three-phase line of the power grid A through a bridge arm. The access method is direct hanging access. And the other end of each integrated photovoltaic and storage unit 10 is connected together through a bridge arm. In this way, the multi-channel integrated photovoltaic and storage unit as a whole can be equivalent to a grid-connected converter to assume the role of voltage and frequency synchronization connection and power transmission with the power grid.

[0027] In this embodiment, each photovoltaic-storage integrated machine submodule is cascaded to form a photovoltaic-storage integrated machine set, and multiple photovoltaic-storage integrated machines are connected together and connected to the power grid to form a cascaded direct-mounted grid-connected converter. Based on the cascaded direct-mounted grid-connected converter, a corresponding grid-type control strategy can be adopted, which provides important support for the subsequent power exchange function with the power grid based on this structure and the function of actively supporting the voltage and frequency of the power grid.

[0028] The collection unit 20 is connected to each integrated photovoltaic and storage unit 10 and the master control unit 40 respectively, and is used to collect the measured data of the power grid and send the measured data of the power grid to the master control unit 40 .

[0029] Specifically, measuring instruments such as voltage transformers and current transformers are provided at the point where each photovoltaic-storage integrated unit 10 is connected to the power grid. When the acquisition unit 20 is required to collect the measured data of the power grid, the acquisition unit 20 obtains the measured power grid data (such as the voltage and current of the power grid) from the measuring instruments provided at the point where each photovoltaic-storage integrated unit 10 is connected to the power grid through communication or circuit connection, and sends the collected measured data of the power grid to the master control unit 40.

[0030] In this embodiment, measuring instruments are set up at the point where each photovoltaic and storage integrated unit is connected to the power grid, and the actual measured data of the power grid is monitored in real time through the acquisition unit, thereby realizing real-time monitoring of the power characteristic data of the input power grid, and providing data support for determining the control of each photovoltaic and storage integrated unit sub-module based on the actual measured data of the current input power grid and the expected data of the input power grid.

[0031] The monitoring unit 30 is connected to each integrated optical-storage machine sub-module 101 and the main control unit 40 respectively, and is used to monitor the status information of each integrated optical-storage machine sub-module 101 and send the status information to the main control unit 40 .

[0032] Specifically, the monitoring unit is connected to each integrated optical storage submodule 101 in communication, and can monitor the current status information of each integrated optical storage submodule 101. The status information mainly includes whether each integrated optical storage submodule 101 is in a normal working state. After the status information of each integrated optical storage submodule 101 is monitored, the status information is sent to the master control unit 40 through communication or other means.

[0033] In this embodiment, the monitoring unit monitors the current status information of each integrated photovoltaic and storage submodule, so that the working status of each integrated photovoltaic and storage submodule can be determined in time. Also, when the integrated photovoltaic and storage submodule is in an abnormal working state, relevant personnel can be notified in time for maintenance, thereby ensuring the safe operation of the power system.

[0034] The main control unit 40 is connected to each photovoltaic-storage integrated machine sub-module 101 respectively, and is used to determine the number of sub-modules in abnormal state based on the status information; when the number of sub-modules in abnormal state is greater than the preset number threshold, all photovoltaic-storage integrated machine sub-modules are controlled to shut down; when the number of sub-modules in abnormal state is less than or equal to the preset number threshold, the power of the photovoltaic-storage integrated machine sub-module 101 in normal state is adjusted according to the actual measured data of the power grid.

[0035] Specifically, the main control unit 40 is connected to each integrated photovoltaic and storage submodule 101 through communication or other means. When the main control unit 40 receives the status information of each integrated photovoltaic and storage submodule 101, it first determines the number of submodules of the integrated photovoltaic and storage submodule 101 that are in an abnormal working state. Afterwards, determine whether the number of submodules is greater than a preset number threshold; if the number of submodules in an abnormal state is greater than the preset number threshold, it is necessary to control all integrated photovoltaic and storage submodules to shut down, and feedback to the relevant responsible personnel, so as to promptly inform the relevant responsible personnel that they need to check and repair; if the number of submodules in an abnormal state is less than or equal to the preset number threshold, the output power of each integrated photovoltaic and storage submodule 101 in a normal state can be adjusted according to the actual measured data of the power grid.

[0036] For example, the master control unit can adjust the active power and reactive power output to the grid by the photovoltaic and storage integrated machine submodule in a normal state according to the measured data of the grid and the grid-forming control algorithm. Among them, by adjusting the active power output to the grid by the photovoltaic and storage integrated machine submodule, the active regulation of the grid frequency can be achieved. By adjusting the reactive power output to the grid by the photovoltaic and storage integrated machine submodule, the active regulation of the grid voltage can be achieved.

[0037] In this embodiment, based on the structure of the cascaded direct-mounted grid-connected converter, and based on the collection of the measured data of the grid by the collection unit, and the monitoring of the working state of each photovoltaic storage integrated machine submodule by the monitoring unit, the measured data of the grid input to the grid can be determined in real time, and the power that each photovoltaic storage integrated machine submodule should output to the grid is determined and controlled according to the measured data of the grid, so as to realize the power exchange function with the grid and the active support of the grid voltage and frequency function, solve the problem that the grid-following converter cannot provide the inertial response, frequency regulation and voltage control capabilities similar to the synchronous generator, realize the active regulation of the grid voltage and frequency, and play the role of actively supporting the grid. At the same time, through the structure of the cascaded direct-mounted grid-connected converter, the structure of connecting multiple grid-connected inverters in parallel on the DC bus is replaced to realize large-capacity power generation, which can solve the problem of multi-machine parallel operation synchronization when the grid-connected inverter adopts a grid-connected control strategy. Optionally, through the structure of the cascaded direct-mounted grid-connected converter, there is no need to set a two-stage conversion isolation device between the DC bus and the grid-connected converter, which can reduce the overall loss of the system and reduce the control complexity of the system.

[0038] The photovoltaic-storage integrated device provided in an embodiment of the present invention comprises a multi-channel photovoltaic-storage integrated machine set, a collection unit, a monitoring unit and a main control unit; wherein the multi-channel photovoltaic-storage integrated machine set comprises three photovoltaic-storage integrated machine sets, each photovoltaic-storage integrated machine set comprises a plurality of cascaded photovoltaic-storage integrated machine sub-modules, and each photovoltaic-storage integrated machine set is directly connected to a power grid; the collection unit is respectively connected to each photovoltaic-storage integrated machine set and the main control unit, and is used for collecting actual measured data of the power grid, and sending the actual measured data of the power grid to the main control unit; the monitoring unit is respectively connected to each photovoltaic-storage integrated machine sub-module and the main control unit, and is used for monitoring the status information of each photovoltaic-storage integrated machine sub-module, and sending the status information to the main control unit; the main control unit is respectively connected to each photovoltaic-storage integrated machine sub-module, and is used for determining the number of sub-modules in an abnormal state according to the status information; when the number of sub-modules in an abnormal state is greater than a preset number threshold, all photovoltaic-storage integrated machine sub-modules are controlled to shut down; when the number of sub-modules in an abnormal state is less than or equal to the preset number threshold, the active power and reactive power of the photovoltaic-storage integrated machine sub-modules in a normal state are adjusted according to the actual measured data of the power grid. In the above technical scheme, each photovoltaic storage integrated machine submodule is cascaded to form a photovoltaic storage integrated unit, and multiple photovoltaic storage integrated units are connected together through bridge arms and connected to the power grid to form a cascaded direct-mounted grid-connected converter. Based on the cascaded direct-mounted grid-connected converter, a corresponding grid-connected control strategy can be adopted, which provides important support for the subsequent power exchange function with the power grid and the function of actively supporting the voltage and frequency of the power grid based on the structure. Based on the structure of the cascaded direct-mounted grid-connected converter, and based on the acquisition unit's acquisition of the measured data of the power grid and the monitoring unit's monitoring of the working status of each photovoltaic storage integrated machine submodule, the measured data of the power grid input to the power grid can be determined in real time, and the active power and reactive power that each photovoltaic storage integrated machine submodule should output to the power grid can be determined and controlled according to the measured data of the power grid, so as to realize the power exchange function with the power grid and the function of actively supporting the voltage and frequency of the power grid. The above technical scheme effectively solves the problem that the grid-following converter cannot provide effective frequency and voltage support capabilities, avoids the risk of synchronization of multiple machines in parallel operation, realizes the active regulation of the frequency and voltage of the power grid, and plays a role in actively supporting the power grid.

[0039] Optionally, the master control unit 40 is specifically used to determine the grid data difference result according to the grid measured data and the preset grid expected data, and adjust the power output of the photovoltaic storage integrated machine submodule to the grid A in a normal state according to the grid data difference result and the grid configuration control algorithm.

[0040] For example, Figure 2 The following is a flow chart of the working method of the optical storage integrated device provided by the embodiment of the present invention. Figure 2 As shown, the method is applied to the master control unit 40. The master control unit may be an electronic device. The electronic device may be a computer or a server. Figure 2, methods include:

[0041] S201, obtaining the measured data of the power grid collected by the collection unit, and obtaining the status information of each photovoltaic storage integrated machine submodule monitored by the monitoring unit.

[0042] The measured data of the power grid are data of the voltage and current of the power grid, etc. The status information is the working status of the photovoltaic and storage integrated machine submodule, for example, whether the photovoltaic and storage integrated machine submodule is in a normal / abnormal working status.

[0043] Specifically, each integrated photovoltaic and storage unit is connected to the power grid through a bridge arm, and one integrated photovoltaic and storage unit corresponds to a main transmission line connected to the power grid. For example, in the a phase line, b phase line and c phase line of the power grid. In addition, measuring instruments such as voltage transformers and current transformers are provided at the connection points to measure the voltage and current of the power grid. After the voltage transformer and the current transformer collect the current and voltage of the power grid, the collection unit will obtain the current and voltage of the current power grid and send them to the main control unit.

[0044] Optionally, the acquisition unit also calculates the voltage amplitude, frequency, active power and reactive power of the power grid based on the current, voltage and acquisition signal, and sends these data as the actual measured data of the power grid to the main control unit.

[0045] Furthermore, the monitoring unit will monitor the current status of each optical storage integrated machine sub-module in real time, and feed back the corresponding status information to the main control unit.

[0046] S202: Determine the number of submodules in abnormal status according to the status information.

[0047] Specifically, after receiving the status information of each integrated optical storage machine submodule, the master control unit will determine the number of integrated optical storage machine submodules in abnormal state, wherein the abnormal state may include the integrated optical storage machine submodule being in shutdown state or abnormal working state.

[0048] S203, determining whether the number of submodules in abnormal state is greater than a preset number threshold; if so, executing S204; if not, executing S205.

[0049] The preset number threshold is the over-limit value of the number of submodules in abnormal state set by the user. Abnormal state includes: abnormal module voltage, communication interruption, insulation detection abnormality, over-temperature, over-current, etc.

[0050] S204, control all optical-storage integrated machine sub-modules to shut down.

[0051] Specifically, if the number of submodules in abnormal state is greater than the preset number threshold, it means that there are many photovoltaic and storage integrated machine submodules in abnormal state at this time, and the remaining photovoltaic and storage integrated machine submodules cannot meet the demand for power transmission to the power grid. Therefore, it is necessary to control all photovoltaic and storage integrated machine submodules to shut down and notify the relevant responsible personnel. And after the relevant responsible personnel inspect and repair the photovoltaic and storage integrated machine submodules in abnormal state, they can return to execute S201.

[0052] S205: Determine the grid data difference result according to the grid measured data and the preset grid expected data.

[0053] The expected power grid data is the expected power grid data input by the user and received by the master control unit.

[0054] Specifically, if the number of submodules in abnormal state is less than or equal to a preset number threshold, the actual power grid data can be compared with the expected power grid data to obtain a power grid data difference result.

[0055] S206: According to the grid data difference result and the grid configuration control algorithm, adjust the power outputted to the grid by the photovoltaic storage integrated machine submodule in a normal state.

[0056] Specifically, when the grid data difference result is obtained, a grid-forming control algorithm can be used to generate a control signal for each photovoltaic and storage sub-module, and adjust the power output of the photovoltaic and storage sub-module in a normal state to the grid according to the control signal.

[0057] Among them, the grid-building control algorithm is a control strategy for power electronic converters in power systems. It enables new energy equipment or energy storage equipment to autonomously build the voltage and frequency of the power grid like traditional synchronous generators, and operate stably in island mode or weak grid conditions. The grid-building control algorithm includes: inertia control, primary frequency control, damping control, voltage regulation control and fault ride-through control.

[0058] And, the control signal of each photovoltaic storage integrated machine submodule is obtained by using the network control algorithm, and each photovoltaic storage integrated machine submodule responds to the corresponding control signal and outputs the corresponding state. All photovoltaic storage integrated machine submodules combine all outputs through the cascade direct-hanging structure to generate the required grid-connected converter voltage, frequency, active power and reactive power.

[0059] Each photovoltaic and storage submodule is equipped with a fully controlled power electronic device to control the output power of the photovoltaic and storage submodule to the grid. After the master control unit generates a control signal for each photovoltaic and storage submodule using a network control algorithm, the master control unit controls the on and off state of the fully controlled power electronic device in each photovoltaic and storage submodule according to the control signal, thereby adjusting the power output of the photovoltaic and storage submodule to the grid in a normal state.

[0060] Figure 3 This is a structural example diagram of a light-storage integrated machine submodule in a light-storage integrated machine device provided by an embodiment of the present invention. Based on the above embodiments, this embodiment focuses on the structure of the light-storage integrated machine submodule in detail. Figure 3 As shown, the photovoltaic storage integrated submodule of the device includes: a photovoltaic unit 1011, an energy storage unit 1012, a submodule monitoring unit 1013 and a submodule control unit 1014.

[0061] The photovoltaic unit 1011 is connected to the energy storage unit 1012 .

[0062] Specifically, the photovoltaic unit 1011 is circuit-connected to the energy storage unit 1012 , and one end of the photovoltaic unit 1011 is connected to one end of the energy storage unit 1012 , and the other end of the photovoltaic unit 1011 is also connected to the other end of the energy storage unit 1012 .

[0063] The submodule monitoring unit 1013 is respectively connected to the photovoltaic unit 1011 and the energy storage unit 1012, and is communicated with the submodule control unit 1014, so as to determine the output status of the photovoltaic storage unit 101 and the operating status of the energy storage unit 1012, and send the output status and operating status to the submodule control unit 1014.

[0064] The output state refers to the capacitance and voltage of the photovoltaic and energy storage integrated module, etc. The operation state refers to the battery charge state of the energy storage unit and the battery charge and discharge state.

[0065] The submodule control unit 1014 is respectively connected to the photovoltaic unit 1011, the energy storage unit 1012, and the submodule monitoring unit 1013 for controlling the operation of the photovoltaic unit 1011 and the energy storage unit 1012 according to the output state and the operation state.

[0066] Specifically, the submodule control unit 1014 can determine the power control of the photovoltaic unit 1011 and the energy storage unit 1012 according to the output status and the operating status, and directly control the output power of the photovoltaic unit 1011 and the energy storage unit 1012, thereby realizing the control of the operating status of the photovoltaic unit 1011 and the energy storage unit 1012.

[0067] Optionally, Figure 4 Another structural example diagram of the integrated optical storage device submodule in the integrated optical storage device provided by the embodiment of the present invention. Figure 4 As shown,

[0068] Optionally, the integrated optical storage submodule further includes: a full control circuit 1015 and two external connection ports 1016;

[0069] The fully controlled circuit 1015 includes a plurality of fully controlled power electronic devices. Figure 4 S1, S2, S3 and S4 in. Multiple fully controlled power electronic power devices are connected to each other in an H-bridge topology.

[0070] Exemplarily, fully controlled power electronic power devices include devices such as insulated gate bipolar transistors, power field effect transistors, and gate turn-off thyristors.

[0071] The full control circuit 1015 is in communication connection with the main control unit 40, and is used to change the states of multiple fully controlled power electronic devices according to the adjustment instructions of the main control unit 40, so as to adjust the power output of the photovoltaic storage integrated machine submodule in a normal state to the power grid.

[0072] One end of the full control circuit 1015 is connected to the photovoltaic unit 1011 and the energy storage unit 1012 respectively, and the other end is connected to two external connection ports 1016 , and a bypass switch is provided between the two external connection ports 1016 .

[0073] Specifically, Figure 4 As shown, the two external connection ports 1016 are intf1 and intf2 in the figure. A bypass switch K is provided between intf1 and intf2.

[0074] The two external connection ports are used to cascade other integrated photovoltaic and storage sub-modules and connect to the power grid. The bypass switch is used to bypass the integrated photovoltaic and storage sub-module when the integrated photovoltaic and storage sub-module is in an abnormal state.

[0075] Specifically, under normal circumstances, intf1 and intf2 are connected to other integrated photovoltaic and storage submodules, and if the current integrated photovoltaic and storage submodule is the last one in each circuit, intf1 and intf2 are directly connected to the power grid through the bridge arm. When the integrated photovoltaic and storage submodule is in an abnormal state, the master control unit 40 can directly control the bypass switch K to bypass the abnormal integrated photovoltaic and storage submodule, so that the abnormal integrated photovoltaic and storage submodule is disconnected from the entire integrated photovoltaic and storage device.

[0076] Optionally, the submodule monitoring unit 1013 includes a submodule capacitor 10131, a capacitor voltage monitor 10132 and a battery state of charge (SOC) monitor 10133;

[0077] The submodule capacitor 10131 is connected in parallel with the photovoltaic unit 1011, the energy storage unit 1012, and the full control circuit 1015 to stabilize the voltage of the photovoltaic and energy storage submodule, thereby achieving the stability of the output voltage of the photovoltaic and energy storage submodule and the stability of the charging and discharging of the energy storage unit.

[0078] The capacitor voltage monitor 10132 is respectively connected to the submodule capacitor 10131 and the submodule control unit 1014 for communication, and is used to collect the output state value at the submodule capacitor 10131, and send the output state value to the submodule control unit 1014. Optionally, the capacitor voltage monitor is also used to assist the monitoring unit and the main control unit in realizing the input or removal state of the submodule of the integrated optical storage device.

[0079] The battery SOC monitor 10133 is respectively connected to the energy storage unit 1012 and the submodule control unit 1014 for communication, and is used to collect the state of charge of the energy storage unit 1012 and send the state of charge to the submodule control unit 1014 .

[0080] Optionally, the submodule control unit 1014 includes a first controller 10141 and a second controller 10142;

[0081] The first controller 10141 is in communication connection with the photovoltaic unit 1011 and is used to send a power control instruction to the photovoltaic unit 1011 according to the received output state value and charge state.

[0082] For example, the first controller may be a maximum power point tracking (MPPT) controller, which can adjust the output power of the photovoltaic module to a maximum value, or reversely adjust the output power of the photovoltaic module to decrease, and the minimum value can be adjusted to 0.

[0083] The second controller 10142 is in communication connection with the energy storage unit 1012 , and is used to send charge and discharge control instructions to the energy storage unit 1012 according to the received output state value, charge state, and charge and discharge state of the energy storage unit 1012 .

[0084] Exemplarily, the second controller may be a bidirectional direct current (DC / DC) controller.

[0085] Optionally, the photovoltaic unit 1011 includes a photovoltaic assembly 10111 and a unidirectional DC-DC converter 10112;

[0086] The photovoltaic assembly 10111 is connected to the unidirectional DC / DC converter 10112 for converting solar energy into electrical energy. The unidirectional DC / DC converter 10112 is in communication with the first controller 10141 for controlling the output power of the photovoltaic assembly 10111 upon receiving a power control instruction. The power transmission direction of the single-phase DC / DC converter is from the photovoltaic assembly side to the submodule capacitor side.

[0087] Optionally, the energy storage unit 1012 includes an energy storage battery 10121 and a bidirectional DC-DC converter 10122;

[0088] The energy storage battery 10121 is connected to the bidirectional DC / DC converter 10122 for storing and outputting electric energy. The bidirectional DC / DC converter 10122 is in communication with the second controller 10142 for controlling the output power of the energy storage battery 10121 when receiving a charge and discharge control instruction. The bidirectional DC / DC converter realizes bidirectional transmission of power between the energy storage battery and the submodule capacitor side through the second controller.

[0089] Specifically, the first controller 10141 is specifically used to determine the capacitor voltage change state of the photovoltaic storage integrated machine submodule 101 according to the output state value and the preset capacitor voltage rated value; when the capacitor voltage change state is unchanged, send a power control instruction to the unidirectional DC / DC converter 10112 to keep the output power unchanged; when the capacitor voltage change state is decreasing, send a power control instruction to the unidirectional DC / DC converter 10112 to increase the output power to a maximum value; when the capacitor voltage change state is increasing, determine the charge state, and receive the unidirectional DC / DC The output power of the photovoltaic component sent by converter 10112; if the state of charge is not fully charged, a power control instruction to increase the output power to the maximum value is sent to the unidirectional DC / DC converter 10112; if the state of charge is fully charged and the output power of the photovoltaic component 10111 is not zero, a power control instruction to reduce the output power is sent to the unidirectional DC / DC converter 10112; if the state of charge is fully charged and the output power of the photovoltaic component 10111 is zero, a power control instruction to control the power of the photovoltaic component to zero is sent to the unidirectional DC / DC converter.

[0090] For example, Figure 5 This is a flowchart of a working method of a submodule of an integrated optical storage device in an integrated optical storage device according to an embodiment of the present invention. Figure 5 As shown, the method is applied to the first controller 10141. The method includes:

[0091] S501, obtaining an output state value collected by a capacitor voltage monitor, and determining a capacitor voltage change state of the integrated photovoltaic and storage device submodule according to the output state value and a preset capacitor voltage rated value.

[0092] Among them, the output state value is the current capacitor voltage value of the integrated optical storage sub-module.

[0093] Specifically, the capacitor voltage monitor collects the capacitance and voltage at the capacitor of the submodule, obtains the output state value, and compares the output state value with the capacitor voltage rated value. If the output state value is greater than the capacitor voltage rated value, it can be determined that the capacitor voltage change state is increasing; if the output state value is equal to the capacitor voltage rated value, it can be determined that the capacitor voltage change state is unchanged; if the output state value is less than the capacitor voltage rated value, it can be determined that the capacitor voltage change state is decreasing.

[0094] S502: If the capacitor voltage change state is unchanged, a power control instruction for outputting unchanged power is sent to the unidirectional DC / DC converter.

[0095] Specifically, if the output state value is equal to the capacitor voltage rated value, that is, the capacitor voltage change state is unchanged, at this time, the first controller can send a power control instruction to the unidirectional DC / DC converter to keep the output power unchanged so that the output power of the photovoltaic component remains unchanged.

[0096] S503: If the capacitor voltage change state is decreasing, a power control instruction for increasing the output power to a maximum value is sent to the unidirectional DC / DC converter.

[0097] Specifically, if the output state value is less than the rated value of the capacitor voltage, that is, the capacitor voltage change state is decreasing, at this time, the first controller can send a power control instruction to the unidirectional DC / DC converter to increase the output power to the maximum value, so that the unidirectional DC / DC converter enters the MPPT control mode, thereby increasing the output power of the photovoltaic unit to the maximum value.

[0098] S504: If the capacitor voltage change state is increasing, determine the charge state, and receive the output power of the photovoltaic assembly sent by the unidirectional DC / DC converter.

[0099] The state of charge includes a fully charged state (SOC=100%) and a partially charged state (SOC<100%).

[0100] Specifically, if the output state value is greater than the rated value of the capacitor voltage, that is, the capacitor voltage change state is increasing, at this time, the first controller needs to determine the current state of charge, that is, obtain the current state of charge of the energy storage battery collected by the battery SOC monitor, and receive the output power of the photovoltaic component sent by the unidirectional DC / DC converter.

[0101] It is worth noting that the above S502, S503 and S504 are parallel steps. And only when it is determined to execute S504, will one of the subsequent steps S505, S506 or S507 be executed.

[0102] S505: If the state of charge is not fully charged, a power control instruction is sent to the unidirectional DC / DC converter to increase the output power to a maximum value.

[0103] S506: If the state of charge is full and the output power of the photovoltaic unit is not zero, a power control instruction for reducing the output power is sent to the unidirectional DC / DC converter.

[0104] S507: If the state of charge is full and the output power of the photovoltaic assembly is zero, a power control instruction for controlling the power of the photovoltaic assembly to be zero is sent to the unidirectional DC / DC converter.

[0105] Specifically, if the state of charge is full and the output power of the photovoltaic module is zero, it means that the energy storage battery is full and the power grid does not need the photovoltaic module to continue to provide power. Therefore, the photovoltaic module can be controlled to enter the standby state, that is, the first controller sends a power control instruction to the unidirectional DC / DC converter to control the power of the photovoltaic module to zero, so that the single-phase DC / DC converter controls the photovoltaic module to standby.

[0106] Specifically, the second controller 10142 is specifically used to determine the capacitor voltage change state of the photovoltaic storage integrated machine sub-module 101 according to the output state value and the preset capacitor voltage rated value; when the capacitor voltage change state is unchanged, a charge and discharge control instruction with unchanged output power is sent to the bidirectional DC / DC converter 10122; when the capacitor voltage change state is increasing and the charge state is in a full state, a charge and discharge control instruction for controlling the output power of the energy storage battery 10121 to be zero is sent to the bidirectional DC / DC converter 10122; when the capacitor voltage change state is increasing, the charge state is not in a full state, and the charge and discharge state is in a discharging state, a charge and discharge control instruction for reducing the discharge power is sent to the bidirectional DC / DC converter 10121; when the capacitor voltage change state is increasing, the charge state is not in a full state, and the charge and discharge state is in a discharging state, When the capacitor voltage change state is large, the charge state is not fully charged, and the charge and discharge state is the charging state, a charge and discharge control instruction for increasing the charging power is sent to the bidirectional DC / DC converter 10121; when the capacitor voltage change state is decreasing and the charge state is an empty state, a charge and discharge control instruction for controlling the output power of the energy storage battery to be zero is sent to the bidirectional DC / DC converter 10121; when the capacitor voltage change state is decreasing, the charge state is not empty, and the charge and discharge state is the charging state, a charge and discharge control instruction for reducing the charging power is sent to the bidirectional DC / DC converter 10121; when the capacitor voltage change state is decreasing, the charge state is not empty, and the charge and discharge state is the discharging state, a charge and discharge control instruction for increasing the discharge power is sent to the bidirectional DC / DC converter 10121.

[0107] For example, Figure 6 Another example flow chart of the working method of the integrated optical storage device submodule in the integrated optical storage device provided by the embodiment of the present invention. Figure 6 As shown, the method is applied to the second controller 10142. The method includes:

[0108] S601, obtaining an output state value collected by a capacitor voltage monitor, and determining a capacitor voltage change state of the integrated photovoltaic and storage device submodule according to the output state value and a preset capacitor voltage rated value.

[0109] Specifically, this step is the same as S501.

[0110] S602: If the capacitor voltage change state is unchanged, a charge and discharge control instruction with unchanged output power is sent to the bidirectional DC / DC converter.

[0111] Specifically, if the capacitor voltage change state is unchanged, there is no need to change the charging power or discharging power of the energy storage unit, and therefore, a charging and discharging control instruction with unchanged output power can be sent to the bidirectional DC / DC converter.

[0112] S603: If the capacitor voltage change state is change, obtain the charge state.

[0113] Specifically, if the capacitor voltage change state is increasing or decreasing, it is necessary to first obtain the charge state monitored by the battery SOC monitor.

[0114] It is worth noting that S602 and S603 are parallel steps. If S602 is executed, S603 will not be executed. If S603 is executed, the subsequent steps will continue to be executed.

[0115] S604: If the capacitor voltage change state is increasing and the charge state is full, a charge and discharge control instruction for controlling the output power of the energy storage battery to zero is sent to the bidirectional DC / DC converter.

[0116] Specifically, if the capacitor voltage changes in an increasing state and the state of charge is a full state, it means that the energy storage battery is already fully charged and cannot be charged further. Therefore, the second controller can send a charge and discharge control instruction to the bidirectional DC / DC converter to control the output power of the energy storage battery to zero, so that the bidirectional DC / DC converter controls the energy storage battery to enter a standby state.

[0117] S605: If the capacitor voltage change state is increasing and the charge state is not fully charged, or if the capacitor voltage change state is decreasing and the charge state is not fully discharged, obtain the charge and discharge state.

[0118] Specifically, if the capacitor voltage change state is increasing and the charge state is not fully charged, or if the capacitor voltage change state is decreasing and the charge state is not discharged, the second controller also needs to obtain the current charge and discharge state of the energy storage battery from the bidirectional DC / DC converter.

[0119] S606: If the capacitor voltage change state is decreasing and the charge state is an empty state, a charge and discharge control instruction for controlling the output power of the energy storage battery to zero is sent to the bidirectional DC / DC converter.

[0120] Specifically, if the capacitor voltage change state is decreasing and the charge state is in the empty state, it means that the energy storage unit has no electricity to release at this time. Therefore, the second controller can send a charge and discharge control instruction to the bidirectional DC / DC converter to control the output power of the energy storage battery to zero, so that the bidirectional DC / DC converter controls the energy storage battery to enter the standby state.

[0121] It is worth noting that S604, S605 and S606 are parallel steps, and only one of the steps will be executed after S603 is executed, and only one of the steps S607, S608, S609 or S610 will be executed after S605 is executed.

[0122] S607: If the capacitor voltage change state is increasing, the charge state is not fully charged, and the charge and discharge state is the discharge state, a charge and discharge control instruction for reducing the discharge power is sent to the bidirectional DC / DC converter.

[0123] S608: If the capacitor voltage change state is increasing, the charge state is not fully charged, and the charge and discharge state is charging, a charge and discharge control instruction for increasing the charging power is sent to the bidirectional DC / DC converter.

[0124] S609: If the capacitor voltage change state is decreasing, the charge state is not discharged, and the charge and discharge state is charging, a charge and discharge control instruction for reducing the charging power is sent to the bidirectional DC / DC converter.

[0125] S610: If the capacitor voltage change state is decreasing, the charge state is not empty, and the charge and discharge state is the discharge state, a charge and discharge control instruction for increasing the discharge power is sent to the bidirectional DC / DC converter.

[0126] Specifically, in the above S607, S608, S609 or S610, the second controller will eventually send the corresponding charge and discharge control instructions to the bidirectional DC / DC converter, so that the bidirectional DC / DC converter controls the charge and discharge power of the energy storage battery according to the charge and discharge control instructions.

[0127] In the photovoltaic-storage integrated device provided by the embodiment of the present invention, each photovoltaic-storage integrated device submodule therein can, on the one hand, determine the current output power of the photovoltaic component based on the output state value at the submodule capacitor and the charge state of the energy storage unit, and can determine the current charge and discharge power of the energy storage battery based on the output state value, the charge state and the charge and discharge state of the energy storage battery. In this way, automatic control of the output power of the photovoltaic component and the energy storage battery is achieved. On the other hand, the first controller is used to control the unidirectional DC / DC converter so that the unidirectional DC / DC converter controls the power generation power of the photovoltaic component, and the second controller is used to control the bidirectional DC / / DC converter so that the bidirectional DC / / DC converter controls the charge and discharge power of the energy storage battery, thereby achieving independent control of the output power of the photovoltaic component and the energy storage battery. Furthermore, the master control unit is used to control the full control circuit in the photovoltaic-storage integrated device submodule, and the first controller and the second controller are used to control the photovoltaic component and the energy storage battery, respectively, thereby achieving decoupling of the power generation control on the DC side of the photovoltaic-storage integrated device and the grid-type control on the AC grid side.

[0128] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0129] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated optical storage device, characterized in that: include: Multi-channel optical storage integrated unit, collection unit, monitoring unit and master control unit; among them, The multi-channel integrated photovoltaic and storage unit comprises three integrated photovoltaic and storage units, each of which comprises a plurality of cascaded integrated photovoltaic and storage sub-modules, and each of which is directly connected to the power grid; The acquisition unit is connected to the integrated photovoltaic and storage unit and the master control unit respectively, and is used to collect the measured data of the power grid and send the measured data of the power grid to the master control unit; The monitoring unit is connected to each of the integrated optical storage machine submodules and the master control unit respectively, and is used to monitor the status information of each of the integrated optical storage machine submodules and send the status information to the master control unit; The master control unit is connected to each of the integrated photovoltaic and storage sub-modules respectively, and is used to determine the number of sub-modules in an abnormal state based on the status information; when the number of sub-modules in an abnormal state is greater than a preset number threshold, control all of the integrated photovoltaic and storage sub-modules to shut down; when the number of sub-modules in an abnormal state is less than or equal to the preset number threshold, adjust the power of the integrated photovoltaic and storage sub-modules in a normal state based on the actual measured data of the power grid.

2. The integrated optical storage device according to claim 1, characterized in that: The master control unit is specifically used to determine the grid data difference result based on the actual grid data and the pre-set grid expected data; and adjust the power output of the photovoltaic storage integrated machine sub-module in a normal state to the grid according to the grid data difference result and the grid configuration control algorithm.

3. The integrated optical storage device according to claim 1, characterized in that: The photovoltaic and energy storage integrated submodule includes: a photovoltaic unit, an energy storage unit, a submodule monitoring unit and a submodule control unit; wherein, The photovoltaic unit is connected to the energy storage unit; The submodule monitoring unit is respectively connected to the photovoltaic unit and the energy storage unit, and is in communication connection with the submodule control unit, and is used to determine the output state of the photovoltaic storage integrated machine submodule and the operating state of the energy storage unit, and send the output state and the operating state to the submodule control unit; The submodule control unit is respectively connected to the photovoltaic unit, the energy storage unit, and the submodule monitoring unit for communication, and is used to control the operation of the photovoltaic unit and the energy storage unit according to the output state and the operation state.

4. The integrated optical storage device according to claim 3, characterized in that: The optical storage integrated machine submodule also includes: a full control circuit and two external connection ports; The fully controlled circuit comprises a plurality of fully controlled power electronic power devices; the plurality of fully controlled power electronic power devices are interconnected in an H-bridge topology structure; The full control circuit is in communication connection with the master control unit, and is used to change the states of the plurality of fully controlled power electronic devices according to the adjustment instructions of the master control unit, so as to adjust the power outputted to the power grid by the photovoltaic storage integrated machine submodule in a normal state; One end of the full-control circuit is connected to the photovoltaic unit and the energy storage unit respectively, and the other end is connected to the two external connection ports, and a bypass switch is provided between the two external connection ports; The two external connection ports are used to cascade other integrated photovoltaic and storage sub-modules and connect to the power grid; the bypass switch is used to bypass the integrated photovoltaic and storage sub-module when the integrated photovoltaic and storage sub-module is in an abnormal state.

5. The integrated optical storage device according to claim 4, characterized in that: The submodule monitoring unit includes a submodule capacitor, a capacitor voltage monitor and a battery state of charge monitor; The submodule capacitor is connected in parallel with the photovoltaic unit, the energy storage unit, and the full control circuit to stabilize the voltage of the photovoltaic and energy storage integrated machine submodule; The capacitor voltage monitor is respectively connected to the submodule capacitor and the submodule control unit for communication, and is used to collect the output state value at the submodule capacitor and send the output state value to the submodule control unit; The battery charge state monitor is respectively connected to the energy storage unit and the submodule control unit for communication, and is used for collecting the charge state of the energy storage unit and sending the charge state to the submodule control unit.

6. The integrated optical storage device according to claim 5, characterized in that: The submodule control unit includes a first controller and a second controller; The first controller is in communication with the photovoltaic unit and is used to send a power control instruction to the photovoltaic unit according to the received output state value and the charge state; The second controller is in communication with the energy storage unit, and is used to send a charge and discharge control instruction to the energy storage unit according to the received output state value, the charge state, and the charge and discharge state of the energy storage unit.

7. The integrated optical storage device according to claim 6, characterized in that: The photovoltaic unit includes a photovoltaic component and a unidirectional DC-DC converter; The photovoltaic module is connected to the unidirectional DC / DC converter to convert solar energy into electrical energy; The unidirectional DC / DC converter is communicatively connected to the first controller, and is used to control the output power of the photovoltaic assembly when receiving the power control instruction.

8. The integrated optical storage device according to claim 7, characterized in that: The first controller is specifically used to determine the capacitor voltage change state of the photovoltaic storage integrated machine sub-module according to the output state value and the preset capacitor voltage rated value; when the capacitor voltage change state is unchanged, send a power control instruction for unchanged output power to the unidirectional DC / DC converter; when the capacitor voltage change state is decreasing, send a power control instruction for increasing the output power to a maximum value to the unidirectional DC / DC converter; when the capacitor voltage change state is increasing, determine the charge state, and receive the output power of the photovoltaic component sent by the unidirectional DC / DC converter; if the charge state is not fully charged, send a power control instruction for increasing the output power to a maximum value to the unidirectional DC / 0DC converter; if the charge state is fully charged and the output power of the photovoltaic component is not zero, send a power control instruction for reducing the output power to the unidirectional DC / DC converter; if the charge state is fully charged and the output power of the photovoltaic component is zero, send a power control instruction for controlling the power of the photovoltaic component to zero to the unidirectional DC / DC converter.

9. The integrated optical storage device according to claim 6, characterized in that: The energy storage unit includes an energy storage battery and a bidirectional DC-DC converter; The energy storage battery is connected to the bidirectional DC / DC converter and is used to store and output electric energy; The bidirectional DC / DC converter is communicatively connected to the second controller and is used to control the output power of the energy storage battery when receiving the charge and discharge control instruction.

10. The integrated optical storage device according to claim 9, characterized in that: The second controller is specifically used to determine the capacitor voltage change state of the photovoltaic storage integrated machine sub-module according to the output state value and the preset capacitor voltage rated value; when the capacitor voltage change state is unchanged, send a charge and discharge control instruction with unchanged output power to the bidirectional DC / DC converter; when the capacitor voltage change state is increasing and the charge state is full, send a charge and discharge control instruction to control the output power of the energy storage battery to zero to the bidirectional DC / DC converter; when the capacitor voltage change state is increasing, the charge state is not full and the charge and discharge state is a discharge state, send a charge and discharge control instruction to reduce the discharge power to the bidirectional DC / DC converter; when the capacitor voltage change state is increasing, the charge state is not full and the charge and discharge state is a discharge state, When the state is not full and the charge-discharge state is a charging state, a charge-discharge control instruction for increasing the charging power is sent to the bidirectional DC / DC converter; when the capacitor voltage change state is decreasing and the charge state is an empty state, a charge-discharge control instruction for controlling the output power of the energy storage battery to be zero is sent to the bidirectional DC / DC converter; when the capacitor voltage change state is decreasing, the charge state is not empty and the charge-discharge state is a charging state, a charge-discharge control instruction for reducing the charging power is sent to the bidirectional DC / DC converter; when the capacitor voltage change state is decreasing, the charge state is not empty and the charge-discharge state is a discharging state, a charge-discharge control instruction for increasing the discharging power is sent to the bidirectional DC / DC converter.

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