Control method, device, storage medium and optical storage system

Abstract

The present application discloses a control method, device, storage medium and photovoltaic storage system. The photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit. The photovoltaic storage unit and the power grid are used to supply power to the load. Each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic module connected to the inverter. The control method includes: when the photovoltaic storage system is in a grid-connected operation state and a normal operation mode, obtaining the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all battery packs and the load power of the load; judging whether the photovoltaic storage system needs to execute a low-power control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power; if necessary, executing the low-power control strategy on the photovoltaic storage unit to control the photovoltaic storage system to enter a low-power operation mode, thereby avoiding the meaningless operation of the photovoltaic storage unit or the situation where the operating power loss accounts for a large proportion, reducing the waste of system resources and improving the economy of electricity use.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic power generation technology, and in particular, relates to a control method, device, storage medium and photovoltaic storage system. Background Art

[0002] Photovoltaic storage system usually refers to solar photovoltaic energy storage power generation system, which is mainly composed of photovoltaic modules and battery packs. Photovoltaic modules use solar cells to directly convert sunlight radiation energy into electrical energy, while battery packs are responsible for storing this electrical energy for use when sunlight is not needed.

[0003] When the light intensity is weak or there is no light, the photovoltaic modules cannot generate electricity or generate insufficient electricity, and two situations are likely to occur: insufficient remaining power in the battery pack or low load power. When the remaining power in the battery pack is insufficient, the battery pack is neither charged nor discharged (or charged and discharged at low power), and the photovoltaic modules do not generate electricity. The operation of some components is meaningless, which not only wastes system resources, but also increases customers' electricity costs. When the load power is small, the power loss required for the operation of some components accounts for a large ratio of the battery discharge power, resulting in more power waste in the battery pack and poor electricity economy. For countries such as Europe with long rainy and snowy seasons, the above scenarios will occur more frequently, so it is necessary to design a reasonable strategy to reduce the waste of photovoltaic storage system resources and improve users' electricity economy. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a control method, device, storage medium and a photovoltaic storage system, which can effectively reduce the resource waste of the photovoltaic storage system and improve the economic efficiency of electricity consumption of users.

[0005] In a first aspect, the present application provides a control method for a photovoltaic storage system, wherein the photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit, wherein the photovoltaic storage unit and the power grid are used to supply power to the load, and each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic assembly connected to the inverter, wherein the control method includes:

[0006] When the photovoltaic storage system is in a grid-connected operation state and a normal working mode, the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all the battery packs and the load power of the load are obtained;

[0007] Determining whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power;

[0008] If it is necessary to execute a low power consumption control strategy, the low power consumption control strategy is executed on the optical storage unit to control the optical storage system to enter a low power consumption working mode.

[0009] In some embodiments, judging whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power includes:

[0010] Determining whether the photovoltaic power supply voltages of all the photovoltaic modules are less than a preset power supply voltage threshold, and the remaining total power is less than or equal to a preset discharge cut-off power;

[0011] If yes, it is determined that the solar energy storage system needs to execute a low power consumption control strategy;

[0012] If not, when the photovoltaic power supply voltage of all the photovoltaic components is less than the preset power supply voltage threshold and the remaining total power is greater than the preset discharge cut-off power, it is determined whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the load power.

[0013] In some embodiments, judging whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the load power includes:

[0014] Determining whether the load power is less than a preset light load threshold;

[0015] When the load power is less than the preset light load threshold, determining that the photovoltaic storage system needs to execute a low power consumption control strategy;

[0016] When the load power is greater than or equal to the preset light-load threshold, it is determined that the photovoltaic storage system does not need to execute a low-power consumption control strategy.

[0017] In some embodiments, after the optical storage system enters the low power consumption working mode, it further includes:

[0018] Monitoring the operating status of the photovoltaic storage system, the photovoltaic power supply voltage, the remaining total power and the change information of the load power;

[0019] If any of the photovoltaic power supply voltage changes to be greater than or equal to a preset power supply voltage threshold, or the operating state changes to an off-grid operation enabled state or an off-grid operation state, the photovoltaic storage system is controlled to enter the normal operating mode;

[0020] If the photovoltaic power supply voltage is less than the preset power supply voltage threshold and the operating state has not changed, the photovoltaic storage system is controlled to enter the normal operating mode according to the change information of the remaining total power and the load power.

[0021] In some embodiments, controlling the photovoltaic storage system to enter the normal operating mode according to the change information of the remaining total power and the load power includes:

[0022] When the remaining total power changes to be greater than the preset discharge cut-off power, and the load power changes to be greater than or equal to the preset light-load power threshold, the photovoltaic storage system is controlled to enter the normal working mode.

[0023] In some embodiments, executing the low power consumption control strategy on the optical storage unit to control the optical storage system to enter a low power consumption working mode includes:

[0024] Turning off the drives in all the inverters and disconnecting the relays in all the inverters;

[0025] Turn off the drivers in all the battery packs and disconnect the relays in all the battery packs.

[0026] In some embodiments, the control method of the optical storage system further includes:

[0027] Obtaining backup power demand information and energy storage working mode of the photovoltaic storage system;

[0028] The method of judging whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the photovoltaic power supply voltage, the remaining total power and the load power includes: judging whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power.

[0029] In some embodiments, the low power consumption control strategy includes a first low power consumption control strategy and a second low power consumption control strategy, and judging whether the photovoltaic storage system needs to execute the low power consumption control strategy according to the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power includes:

[0030] Determining whether the photovoltaic power supply voltage of all the photovoltaic modules is less than a preset power supply voltage threshold;

[0031] If both are less than the preset supply voltage threshold, determining whether the backup power demand information indicates that energy storage backup power is required;

[0032] If it is indicated that energy storage backup is required, judging whether the photovoltaic storage system needs to execute the first low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power;

[0033] If it is indicated that no energy storage backup power is required, it is determined whether the photovoltaic storage system needs to execute the second low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power.

[0034] In some embodiments, judging whether the photovoltaic storage system needs to execute the first low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power includes:

[0035] Determining whether the energy storage working mode is a charging mode;

[0036] If it is in charging mode, when the remaining total power is greater than or equal to the preset charging cut-off power, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy;

[0037] If it is a discharge mode, when the remaining total power is less than or equal to the preset discharge cut-off power, or the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy.

[0038] In some embodiments, when it is determined that the first low-power control strategy needs to be executed, the low-power control strategy is executed on the photovoltaic storage unit to control the photovoltaic storage system to enter a low-power operation mode, including: turning off the drivers in all the inverters and disconnecting the relays in all the inverters;

[0039] When it is determined that the second low-power control strategy needs to be executed, the low-power control strategy is executed on the photovoltaic storage unit to control the photovoltaic storage system to enter a low-power operation mode, including: turning off all the drives in the inverter and disconnecting all the relays in the inverter; turning off all the drives in the battery pack and disconnecting all the relays in the battery pack.

[0040] In some embodiments, when each of the energy storage units includes a plurality of the battery packs and it is determined that the first low power consumption control strategy needs to be executed, the low power consumption control strategy is executed on the photo-storage unit to control the photo-storage system to enter a low power consumption working mode, and further includes:

[0041] Turn off the drive of some of the battery packs in each of the energy storage units and disconnect the corresponding relays.

[0042] In a second aspect, the present application provides a control device for a photovoltaic storage system, the photovoltaic storage system comprising a load, a power grid and at least one photovoltaic storage unit, the photovoltaic storage unit and the power grid are used to supply power to the load, each photovoltaic storage unit comprises an inverter, at least one battery pack connected to the inverter, and a photovoltaic assembly connected to the inverter, the control device comprising:

[0043] An acquisition unit, used to acquire the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all the battery packs, and the load power of the load when the photovoltaic storage system is in a grid-connected operation state and a normal working mode;

[0044] A judgment unit, used for judging whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power;

[0045] The execution unit is used to execute the low power consumption control strategy on the optical storage unit if it is necessary to execute the low power consumption control strategy, so as to control the optical storage system to enter a low power consumption working mode.

[0046] In some embodiments, the determining unit is specifically configured to:

[0047] Determining whether the photovoltaic power supply voltages of all the photovoltaic modules are less than a preset power supply voltage threshold, and the remaining total power is less than or equal to a preset discharge cut-off power;

[0048] If yes, it is determined that the solar energy storage system needs to execute a low power consumption control strategy;

[0049] If not, when the photovoltaic power supply voltage of all the photovoltaic components is less than the preset power supply voltage threshold and the remaining total power is greater than the preset discharge cut-off power, it is determined whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the load power.

[0050] In some embodiments, the determining unit is specifically configured to:

[0051] Determining whether the load power is less than a preset light load threshold;

[0052] When the load power is less than the preset light load threshold, determining that the photovoltaic storage system needs to execute a low power consumption control strategy;

[0053] When the load power is greater than or equal to the preset light-load threshold, it is determined that the photovoltaic storage system does not need to execute a low-power consumption control strategy.

[0054] In some embodiments, the control device of the solar energy storage system further includes a monitoring unit for:

[0055] After the photovoltaic storage system enters the low power consumption working mode, monitoring the operation status of the photovoltaic storage system, the photovoltaic power supply voltage, the remaining total power and the change information of the load power;

[0056] If any of the photovoltaic power supply voltage changes to be greater than or equal to a preset power supply voltage threshold, or the operating state changes to an off-grid operation enabled state or an off-grid operation state, the photovoltaic storage system is controlled to enter the normal operating mode;

[0057] If the photovoltaic power supply voltage is less than the preset power supply voltage threshold and the operating state has not changed, the photovoltaic storage system is controlled to enter the normal operating mode according to the change information of the remaining total power and the load power.

[0058] In some embodiments, the monitoring unit is specifically used for:

[0059] When the remaining total power changes to be greater than the preset discharge cut-off power, and the load power changes to be greater than or equal to the preset light-load power threshold, the photovoltaic storage system is controlled to enter the normal working mode.

[0060] In some embodiments, the execution unit is specifically used to:

[0061] Turning off the drives in all the inverters and disconnecting the relays in all the inverters;

[0062] Turn off the drivers in all the battery packs and disconnect the relays in all the battery packs.

[0063] In some embodiments, the acquisition unit is further used to: acquire backup power demand information and energy storage working mode of the photovoltaic storage system;

[0064] The judging unit is specifically used for:

[0065] Whether the photovoltaic storage system needs to execute a low power consumption control strategy is determined according to the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power.

[0066] In some embodiments, the low power consumption control strategy includes a first low power consumption control strategy and a second low power consumption control strategy, and the determination unit is specifically configured to:

[0067] Determining whether the photovoltaic power supply voltage of all the photovoltaic modules is less than a preset power supply voltage threshold;

[0068] If both are less than the preset supply voltage threshold, determining whether the backup power demand information indicates that energy storage backup power is required;

[0069] If it is indicated that energy storage backup is required, judging whether the photovoltaic storage system needs to execute the first low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power;

[0070] If it is indicated that no energy storage backup power is required, it is determined whether the photovoltaic storage system needs to execute the second low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power.

[0071] In some embodiments, the determining unit is specifically configured to:

[0072] Determining whether the energy storage working mode is a charging mode;

[0073] If it is in charging mode, when the remaining total power is greater than or equal to the preset charging cut-off power, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy;

[0074] If it is a discharge mode, when the remaining total power is less than or equal to the preset discharge cut-off power, or the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy.

[0075] In some embodiments, when it is determined that the first low power consumption control strategy needs to be executed, the execution unit is specifically used to: shut down the drivers in all the inverters, and disconnect the relays in all the inverters;

[0076] When it is determined that the second low-power control strategy needs to be executed, the execution unit is specifically used to: turn off the drives in all the inverters and disconnect the relays in all the inverters; turn off the drives in all the battery packs and disconnect the relays in all the battery packs.

[0077] In some embodiments, when each of the energy storage units includes a plurality of the battery packs and it is determined that the first low power consumption control strategy needs to be executed, the execution unit is further configured to:

[0078] Turn off the drive of some of the battery packs in each of the energy storage units and disconnect the corresponding relays.

[0079] In a third aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-mentioned control methods for the optical storage system.

[0080] In a fourth aspect, the present application provides a photovoltaic storage system, comprising: the photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit, the photovoltaic storage unit and the power grid are used to supply power to the load, each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic assembly connected to the inverter;

[0081] The photovoltaic storage system further includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any of the above-mentioned control methods for the photovoltaic storage system is implemented.

[0082] The control method, device, storage medium and photovoltaic storage system provided in the embodiments of the present application, when the photovoltaic storage system is in a grid-connected operation state and a normal working mode, obtains the photovoltaic power supply voltage, the remaining total power and the load power in real time, and analyzes and judges whether the photovoltaic storage system needs to execute a low-power control strategy based on the photovoltaic power supply voltage, the remaining total power and the load power. If so, the low-power control strategy is executed on the photovoltaic storage unit, thereby avoiding the meaningless operation of the photovoltaic storage unit or the situation where the operating power loss accounts for a large proportion, minimizing the waste of system resources, improving the economy of electricity use, and having high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0084] Figure 1 is a flow chart of a control method of a photovoltaic storage system provided in an embodiment of the present application;

[0085] Figure 2 is a schematic diagram of the structure of the optical storage system provided in an embodiment of the present application;

[0086] Figure 3 Schematic diagram of the framework of the control method of the photovoltaic storage system provided in the embodiment of the present application;

[0087] Figure 4 is another flow chart of the control method of the photovoltaic storage system provided in an embodiment of the present application;

[0088] Figure 5 is another flow chart of the control method of the photovoltaic storage system provided in an embodiment of the present application;

[0089] Figure 6 is another schematic diagram of a control method for a photovoltaic storage system provided in an embodiment of the present application;

[0090] Figure 7 is another flow chart of the control method of the photovoltaic storage system provided in an embodiment of the present application;

[0091] Figure 8 is a schematic diagram of the structure of a control device for a photovoltaic storage system provided in an embodiment of the present application;

[0092] Fig. 9 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0093] Fig.10 It is a schematic diagram of the hardware structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0094] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0095] When the photovoltaic storage system is running at night, the photovoltaic components in the photovoltaic storage unit cannot generate electricity or generate insufficient electricity. There are two power supply scenarios: ① The battery pack is discharged to SOC 0. At this time, the battery pack can no longer supply power to the load, and the load is generally powered by the power grid; ② The load power is small, and the battery pack supplies power to the load, resulting in a small battery discharge power. In the first case, the battery pack is neither charged nor discharged (or charged and discharged at a low power), and the photovoltaic components do not generate electricity. The operation of the photovoltaic storage unit is meaningless, which not only wastes system resources, but also increases the customer's electricity cost. In the second case, the power loss required for the operation of the photovoltaic storage unit accounts for a large ratio of the battery discharge power, resulting in a large waste of power in the battery pack and poor electricity economy.

[0096] To solve at least one of the above technical problems, the embodiments of the present application provide a control method, device, storage medium and optical storage system for an optical storage system.

[0097] See also Figure 1 and Figure 2 , Figure 1 is a flow chart of a control method of a photovoltaic storage system provided in an embodiment of the present application, Figure 2 It is a schematic diagram of the structure of the photovoltaic storage system provided in the embodiment of the present application. The photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit. The photovoltaic storage unit and the power grid are used to supply power to the load. Each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic module connected to the inverter. The photovoltaic storage system also includes a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the control method of any photovoltaic storage system provided in the embodiment of the present application is implemented.

[0098] The execution subject of the control method of the optical storage system can be an electronic device or a functional module or functional entity (such as a processor) in the electronic device that can implement the control method. The electronic devices mentioned in the embodiments of the present application include but are not limited to tablet computers, desktop computers and mobile devices (such as mobile phones, personal digital assistants, dedicated messaging devices), etc. The control method of the optical storage system provided in the embodiments of the present application is described below by taking the electronic device as the execution subject. The control method of the optical storage system includes the following steps 101-103, wherein:

[0099] 101. When the photovoltaic storage system is in the grid-connected operation state and the normal working mode, the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all battery packs and the load power of the load are obtained;

[0100] 102. Determine whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the photovoltaic power supply voltage, the remaining total power and the load power; if so, execute the following step 103; if not, return to execute step 101.

[0101] 103. Execute a low power consumption control strategy on the photovoltaic storage unit to control the photovoltaic storage system to enter a low power consumption working mode.

[0102] That is, the embodiment of the present application obtains the photovoltaic power supply voltage, the remaining total power and the load power in real time when the photovoltaic storage system is in the grid-connected operation state and the normal working mode, and analyzes and determines whether the photovoltaic storage system needs to execute a low-power consumption control strategy based on the photovoltaic power supply voltage, the remaining total power and the load power. If so, the low-power consumption control strategy is executed on the photovoltaic storage unit, thereby avoiding the meaningless operation of the photovoltaic storage unit or the situation where the operating power loss accounts for a large proportion, minimizing the waste of system resources, improving the economy of electricity use, and having high flexibility.

[0103] The above steps 101-103 will be described in detail below by taking a photovoltaic storage system with multiple operating states such as off-grid operation and grid-connected operation as an example.

[0104] 101. When the photovoltaic storage system is in grid-connected operation and normal working mode, the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all battery packs and the load power of the load are obtained.

[0105] Among them, when in the grid-connected operation state and normal working mode, the system can periodically (for example, every five minutes) obtain the photovoltaic power supply voltage, remaining total power and load power within a period of time for analysis and judgment to improve the reliability of the analysis results. The photovoltaic storage system includes at least three operating states: grid-connected operation state, off-grid enabled operation state and off-grid operation state. The grid-connected operation state refers to the operation state when the grid is connected to the photovoltaic storage system as a power supply source, the off-grid operation state refers to the operation state when the grid is not connected to the photovoltaic storage system, and the off-grid enabled operation state refers to the operation state when the photovoltaic storage system is about to enter the off-grid operation state from the grid-connected operation state. The photovoltaic storage system can include two working modes: normal working mode and low power consumption working mode. In the low power consumption working mode, some devices in the photovoltaic storage system are in shutdown or sleep state, and the system power consumption is significantly reduced.

[0106] For details, see the above Figure 2 and Figure 3 , Figure 3 It is a framework diagram of the control method of the photovoltaic storage system provided in an embodiment of the present application. The photovoltaic storage system includes M photovoltaic storage units. In addition to the battery pack, inverter and photovoltaic module (PCS), the photovoltaic storage unit also includes some other components to maintain its own operation. The number of battery packs in each photovoltaic storage unit is N, and the inverter and the battery pack can be packaged as one body. The number of inverters in the system is consistent with the number of photovoltaic storage units, M≥1, N≥1. Photovoltaic modules are components that convert solar radiation energy into electrical energy, and the converted electrical energy can be transmitted to battery packs or loads via inverters. Photovoltaic supply voltage (PV) is the voltage output by photovoltaic modules to the inverter, and photovoltaic modules can supply power to battery packs or loads via inverters. The total remaining power is determined based on the SOC (State Of Charge) of each battery pack in the photovoltaic storage unit, and the SOC reflects the remaining capacity of the corresponding battery pack.

[0107] In some embodiments, the photovoltaic storage system further includes a power collector located on the grid side, and the above step of "obtaining the load power of the load" specifically includes:

[0108] Obtain the grid feed power through the power collector and obtain the inverter output power;

[0109] The load power of the load is determined according to the output power of all inverters and the grid-fed power.

[0110] Please continue to see Figure 2The power collector can be a gateway or an electric meter, etc. The power collector and the inverter are both connected to the processor for communication. For example, a multi-channel interface is set on the processor, and the power collector and the inverter are connected through the multi-channel interface to communicate with them. The grid-feeding power is collected by the power collector and transmitted to the processor. The processor can first calculate the sum of the output powers of all inverters to obtain the total inverter power, and then calculate the difference between the total inverter power and the grid-feeding power. The difference is the load power of the load.

[0111] 102. Determine whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the photovoltaic power supply voltage, the remaining total power and the load power; if necessary, execute the following step 103; if not, return to execute step 101.

[0112] Among them, by analyzing the photovoltaic power supply voltage, the remaining total power and the load power, it is determined whether the photovoltaic storage system is in a situation where there is a lot of system resource waste. For example, the photovoltaic storage unit is running meaninglessly for a long time or the operating power loss accounts for a large proportion. These situations are all situations where there is a lot of system resource waste. If the analysis shows that there is a lot of system resource waste, it is considered that a low-power control strategy needs to be implemented to reduce the overall system loss. Otherwise, there is no need to implement a low-power control strategy.

[0113] In some embodiments, see Figure 4 , Figure 4 This is another flow chart of the control method of the photovoltaic storage system provided by the embodiment of the present application. The above step of "determining whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the photovoltaic power supply voltage, the remaining total power and the load power" may specifically include:

[0114] 1021. Determine whether the photovoltaic power supply voltages of all photovoltaic modules are less than the preset power supply voltage threshold, and the remaining total power is less than or equal to the preset discharge cut-off power; if so, determine that the photovoltaic storage system needs to execute a low power consumption control strategy; if not, when the photovoltaic power supply voltages of all photovoltaic modules are less than the preset power supply voltage threshold, and the remaining total power is greater than the preset discharge cut-off power, execute step 1022, and when the photovoltaic power supply voltage of any photovoltaic module is greater than or equal to the preset power supply voltage threshold, re-execute step 101;

[0115] 1022. Determine whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the load power.

[0116] The preset power supply voltage threshold is the minimum voltage that the photovoltaic module can normally supply power. If the voltage is lower than the minimum voltage, the photovoltaic module cannot supply power or the power supply is abnormal. For example, when the photovoltaic module cannot receive light at night or the light intensity received is too weak, the photovoltaic power supply voltage will be lower than the minimum voltage. The preset discharge cut-off power is the minimum power that the battery pack can normally discharge. If the power is equal to or lower than the minimum power, the battery pack has insufficient reserve power and cannot discharge or discharges abnormally.

[0117] In actual operation, the size of the photovoltaic power supply voltage can be compared and analyzed first. When the photovoltaic power supply voltage of any photovoltaic module is greater than or equal to the preset power supply voltage threshold, it indicates that the photovoltaic module can supply power normally, and it is determined that the photovoltaic storage system does not need to implement a low-power control strategy. When the photovoltaic power supply voltage of all photovoltaic modules is less than the preset power supply voltage threshold, it indicates that the photovoltaic module cannot supply power normally, and the remaining total power of the battery pack needs to be further analyzed. Among them, once the remaining total power is less than or equal to the preset discharge cut-off power, the battery pack cannot supply power normally. In this case, power is usually taken from the power grid. At this time, the photovoltaic storage unit can neither receive power from the outside through the photovoltaic module nor provide power to the load. Its operation is meaningless. It can be determined that the photovoltaic storage system needs to implement a low-power control strategy. When the remaining total power is greater than the discharge cut-off power, it indicates that the battery pack can discharge normally, and the load power needs to be further analyzed.

[0118] In some embodiments, the above step 1022 may specifically include:

[0119] Determining whether the load power is less than a preset light load threshold;

[0120] When the load power is less than the preset light load threshold, it is determined that the photovoltaic storage system needs to execute a low power consumption control strategy; when the load power is greater than or equal to the preset light load threshold, it is determined that the photovoltaic storage system does not need to execute a low power consumption control strategy.

[0121] Among them, if the load power is less than the preset light load threshold, it means that the load consumes very little power, even less than the power loss required by the photovoltaic storage unit to maintain its own operation. In this case, the power required for the photovoltaic storage unit to operate itself accounts for a large ratio of the battery pack discharge power (power loss accounts for a large proportion), the battery pack wastes a lot of power, and the economy is poor during power supply. It can be determined that the photovoltaic storage system needs to implement a low-power control strategy. If the load power is greater than or equal to the preset light load threshold, it means that the power consumption of the load accounts for a normal range, and it can be determined that the photovoltaic storage system does not need to implement a low-power control strategy.

[0122] In some embodiments, in addition to considering the objective parameters mentioned above (i.e., the photovoltaic power supply voltage, the remaining total power, and the load power), user-defined requirements may also be considered for whether to finally execute the low-power control strategy. For example, the photovoltaic storage system may provide a low-power intelligent adjustment service that can be manually selected by the user. If the user chooses to start the low-power intelligent adjustment service, the system may execute the low-power control strategy to achieve intelligent adjustment when the objective parameters determine that the low-power control strategy needs to be executed. If the user chooses not to start the low-power intelligent adjustment service, for example, for some special or important time points, in order to ensure that the photovoltaic storage system has better dynamic response performance, the user may choose not to start the low-power intelligent adjustment service. In this case, even if the above objective parameters meet the judgment conditions, the low-power control strategy will not be executed in the end. In actual operation, the user's needs may be analyzed before the load power is analyzed. That is, before executing the above step 1022, the control method of the photovoltaic storage system may also include:

[0123] Detecting whether the photovoltaic storage system has started a low-power intelligent regulation service;

[0124] If it has been started, execute the above step 1022; if it has not been started, return to execute the above step 101.

[0125] 103. Execute the low power consumption control strategy on the photovoltaic storage unit to control the photovoltaic storage system to enter a low power consumption working mode.

[0126] Among them, the low power consumption control strategy is to reduce the system power consumption by controlling some components in the optical storage unit to enter a sleep or shutdown state, thereby making the system enter a low power consumption working mode.

[0127] In some embodiments, the components involved in the low power consumption control strategy include the inverter and battery pack in the photovoltaic storage unit. In this case, please continue to refer to Figure 4 , the above step 103 may specifically include:

[0128] Turn off the drives in all inverters and disconnect the relays in all inverters;

[0129] Turn off the drivers in all battery packs and disconnect the relays in all battery packs.

[0130] Among them, when the system determines that a low-power control strategy needs to be executed, a sleep instruction can be sent to each photovoltaic storage unit to shut down the inverter and the battery pack. Specifically, the inverter is sealed (mainly refers to shutting down the drive of its power switch tube) and all relays are tripped, and each battery pack is sealed (mainly refers to shutting down the drive of its power switch tube) and all relays are tripped. This lasts for a period of time, and the photovoltaic storage unit as a whole enters a sleep state, thereby greatly reducing the power loss of the photovoltaic storage unit itself, avoiding long-term meaningless operation of the photovoltaic storage unit, and reducing the waste of system resources.

[0131] It should be noted that after the photovoltaic storage system enters the low-power working mode, the dormant photovoltaic storage unit can be awakened according to the real-time operation of the photovoltaic storage system, so that the photovoltaic storage system exits the low-power working mode, and flexible switching between the low-power working mode and the normal working mode is achieved. That is, the control method of the photovoltaic storage system can also include:

[0132] Monitoring the operating status of the photovoltaic storage system, the photovoltaic power supply voltage, the remaining total power and the change information of the load power;

[0133] If any of the photovoltaic power supply voltage changes to be greater than or equal to a preset power supply voltage threshold, or the operating state changes to an off-grid operation enabled state or an off-grid operation state, the photovoltaic storage system is controlled to enter the normal operating mode;

[0134] If the photovoltaic power supply voltage is less than the preset power supply voltage threshold and the operating state has not changed, the photovoltaic storage system is controlled to enter the normal operating mode according to the change information of the remaining total power and the load power.

[0135] Among them, once it is monitored that the photovoltaic power supply voltage changes, and the change is greater than or equal to the preset power supply voltage threshold, it indicates that the photovoltaic module can supply power normally. At this time, the photovoltaic storage system can be controlled to enter the normal working mode from the current low-power working mode, or, once it is monitored that the operating state of the photovoltaic storage system has changed, and the change is to the off-grid operation enabled state or the off-grid operation state, then because in the off-grid operation state, the low-power working mode will cause the dormant photovoltaic storage unit to be unable to be reawakened, and in the off-grid enabled state, the system needs to have a high dynamic response performance of on-grid and off-grid, so these two operating states need to wake up the photovoltaic storage unit and control the photovoltaic storage system to enter the normal working mode. If the photovoltaic storage system is still in the grid-connected operation state (the operating state has not changed), and the photovoltaic power supply voltage has not changed or is still less than the preset power supply voltage threshold after the change, it is necessary to further analyze the changes in the remaining total power and the load power.

[0136] Furthermore, the above step of “controlling the photovoltaic storage system to enter the normal working mode according to the change information of the remaining total power and the load power” may specifically include:

[0137] When the remaining total power changes to be greater than the preset discharge cut-off power, and the load power changes to be greater than or equal to the preset light-load power threshold, the photovoltaic storage system is controlled to enter the normal working mode.

[0138] Among them, when the remaining total power is greater than the preset discharge cut-off power, it indicates that the battery pack can supply power normally. At this time, in order to avoid the situation where the operating loss of the photovoltaic storage unit itself accounts for a large proportion, resulting in waste of system resources, only when the load power changes to be greater than or equal to the preset light load power threshold, the photovoltaic storage system is controlled to enter the normal working mode from the current low-power working mode, that is, the relay disconnected in the inverter is attracted, and then the drive closed in the inverter is turned on. At the same time, the relay disconnected in the battery pack is first attracted, and then the drive closed in the battery pack is turned on.

[0139] In addition, in other embodiments, the photovoltaic storage system may also have a backup power function. The backup power function means that for some countries with unstable power supply, the power grid may lose power at any time. When the power grid suddenly loses power, the photovoltaic storage system can continue to output stable AC power to the load to ensure the normal operation of the load.

[0140] Please continue to refer to the above Figure 1 and Figure 2 The following will take the photovoltaic storage system with backup power function as an example to describe the above steps 101-103 in detail.

[0141] 101. When the photovoltaic storage system is in grid-connected operation and normal working mode, the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all battery packs and the load power of the load are obtained.

[0142] Among them, when the photovoltaic storage system is in a grid-connected operation state and a normal working mode, the control method of the photovoltaic storage system also includes: obtaining the backup power demand information and the energy storage working mode of the photovoltaic storage system, that is, see Figure 5 and Figure 6 , Figure 5 is another flow chart of the control method of the photovoltaic storage system provided in the embodiment of the present application, Figure 6 It is another framework diagram of the control method of the photovoltaic storage system provided in the embodiment of the present application. The above step 101 is specifically as follows: when the photovoltaic storage system is in a grid-connected operation state and a normal working mode, the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all battery packs and the load power of the load are obtained, and the backup power demand information and energy storage working mode of the photovoltaic storage system are obtained.

[0143] Specifically, the backup power demand information mainly indicates whether the photovoltaic storage system needs energy storage backup power, which can be manually input by the user according to actual needs. For example, the electronic device can provide option buttons about energy storage backup power, such as "energy storage backup power required" and "no energy storage backup power required". The user generates backup power demand information indicating that the photovoltaic storage system needs energy storage backup power by selecting the "energy storage backup power required" button, and generates backup power demand information indicating that the photovoltaic storage system does not need energy storage backup power by selecting the "no energy storage backup power required" button. The energy storage working mode is the working mode of the energy storage component (battery pack) in the photovoltaic storage system, which can generally include two types: discharge mode and charging mode.

[0144] 102. Determine whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the photovoltaic power supply voltage, the remaining total power and the load power; if necessary, execute the following step 103; if not, return to execute step 101.

[0145] If step 101 also needs to obtain backup power demand information and energy storage working mode, please continue to refer to Figure 5 , the above step 102 may now include: judging whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power.

[0146] In some embodiments, the low power consumption control strategy includes a first low power consumption control strategy and a second low power consumption control strategy. Figure 7 , Figure 7 is another flow chart of the control method of the photovoltaic storage system provided in the embodiment of the present application. The above step 102 may specifically include:

[0147] 1021. Determine whether the photovoltaic power supply voltages of all photovoltaic modules are less than a preset power supply voltage threshold; if so, execute the following step 1022; if not, determine that the photovoltaic storage system does not need to execute a low power consumption control strategy;

[0148] 1022. Determine whether the backup power demand information indicates that energy storage backup power is required; if it indicates that energy storage backup power is required, execute the following step 1023; if it indicates that energy storage backup power is not required, execute the following step 1024;

[0149] 1023. Determine whether the photovoltaic storage system needs to execute a first low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power;

[0150] 1024. Determine whether the photovoltaic storage system needs to execute a second low power consumption control strategy based on the energy storage working mode, the remaining total power and the load power.

[0151] Among them, the first low-power control strategy is applicable to scenarios where energy storage backup is required. It can reduce losses without the photovoltaic storage unit entering a sleep state, to ensure that the photovoltaic storage system can continue to supply power to the load when the power grid is powered off. The second low-power control strategy is applicable to scenarios where energy storage backup is not required. It reduces losses by controlling the photovoltaic storage unit to enter a sleep state, which can minimize the waste of system resources.

[0152] In some embodiments, the above step 1023 may specifically include:

[0153] Determining whether the energy storage working mode is a charging mode;

[0154] If it is in charging mode, when the remaining total power is greater than or equal to the preset charging cut-off power, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy, otherwise it is determined that the photovoltaic storage system does not need to execute the first low power consumption control strategy;

[0155] If it is in discharge mode, when the remaining total power is less than or equal to the preset discharge cut-off power, or the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy; otherwise, it is determined that the photovoltaic storage system does not need to execute the first low power consumption control strategy.

[0156] That is, please continue to see Figure 6 , in the scenario where energy storage backup power is required, ① if the battery pack is charging (i.e. the energy storage working mode is charging mode), when the remaining total power is greater than or equal to the preset charging cut-off power, it means that the battery pack has sufficient power. At this time, in order to avoid the system running for a long time without any meaningless high energy consumption without any charging and discharging behavior after the battery is fully charged, the loss can be reduced on the premise that the photovoltaic storage unit does not enter the dormant state, otherwise no loss reduction is performed. ② if the battery pack is discharging (i.e. the energy storage working mode is discharging mode), when the remaining total power is less than or equal to the preset discharge cut-off power, it means that the battery pack cannot be discharged normally. At this time, in order to avoid the system running for a long time without any meaningless high energy consumption without any charging and discharging behavior after the battery is empty, the loss can be reduced on the premise that the photovoltaic storage unit does not enter the dormant state; and when the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it means that although the battery pack can be discharged normally, the power loss of the photovoltaic storage unit itself accounts for a large proportion. At this time, in order to reduce resource waste, the loss can be reduced on the premise that the photovoltaic storage unit does not enter the dormant state; otherwise, no loss reduction is performed.

[0157] In some embodiments, the above step 1024 may specifically include:

[0158] Determining whether the energy storage working mode is a charging mode;

[0159] If it is in charging mode, when the remaining total power is greater than the preset charging cut-off power, it is determined that the photovoltaic storage system needs to execute the second low power consumption control strategy;

[0160] If it is a discharge mode, when the remaining total power is less than or equal to the preset discharge cut-off power, or the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic storage system needs to execute the second low power consumption control strategy.

[0161] That is, please continue to see Figure 6 , in the scenario where energy storage backup is not required, ③ if the battery pack is charging (i.e. the energy storage working mode is charging mode), when the remaining total power is greater than or equal to the preset charging cut-off power, it means that the battery pack has sufficient power. At this time, in order to avoid the system running for a long time without any meaningless high energy consumption without any charging and discharging behavior after the battery is fully charged, causing resource waste, the photovoltaic storage unit can be controlled to enter a dormant state to reduce losses, otherwise no loss reduction is performed. ④ if the battery pack is discharging (i.e. the energy storage working mode is discharging mode), when the remaining total power is less than or equal to the preset discharge cut-off power, it means that the battery pack cannot be discharged normally. At this time, in order to avoid the system running for a long time without any meaningless high energy consumption without any charging and discharging behavior after the battery is empty, causing resource waste, the photovoltaic storage unit can be controlled to enter a dormant state to reduce losses; and when the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it means that although the battery pack can be discharged normally, the power loss of the photovoltaic storage unit itself accounts for a large proportion. At this time, in order to reduce resource waste, the photovoltaic storage unit can be controlled to enter a dormant state to reduce losses; otherwise no loss reduction is performed.

[0162] 103. Execute the low power consumption control strategy on the photovoltaic storage unit to control the photovoltaic storage system to enter a low power consumption working mode.

[0163] In some embodiments, when the low power consumption control strategy includes the first low power consumption control strategy and the second low power consumption control strategy, please continue to refer to the above Figure 6 and Figure 7 , the above step 103 specifically includes:

[0164] 1031. When it is determined that the first low power consumption control strategy needs to be executed, the drivers in all inverters are turned off, and the relays in all inverters are disconnected;

[0165] 1032. When it is determined that the second low power consumption control strategy needs to be executed, the drivers in all inverters are turned off and the relays in all inverters are disconnected; the drivers in all battery packs are turned off and the relays in all battery packs are disconnected.

[0166] That is, the execution means in the first low-power control strategy and the second low-power control strategy at least include: shutting down the inverter in the photovoltaic storage unit (that is, shutting down the drivers in all inverters and disconnecting the relays in all inverters). It should be pointed out that since the first low-power control strategy is a low-power control strategy applicable to scenarios requiring energy storage and backup power, and the second low-power control strategy is a low-power control strategy applicable to scenarios without energy storage and backup power, and in scenarios without energy storage and backup power, the photovoltaic storage unit does not need to be ready to supply power to the load at any time, and in scenarios requiring energy storage and backup power, the photovoltaic storage unit needs to supply power to the load at any time when the power grid is powered off, so the second low-power control strategy It is also possible to further shut down all the battery packs in the photo-storage unit (that is, turn off the drivers in all the battery packs and disconnect the relays in all the battery packs) so that the photo-storage unit enters a sleep state to achieve maximum system loss reduction. The first low-power control strategy needs to determine whether the battery packs need to be further shut down based on the number of battery packs in the photo-storage unit. For example, when the photo-storage unit includes only one battery pack, there is no need to shut down the battery pack. When the photo-storage unit includes multiple battery packs, it is necessary to shut down some of the battery packs and keep at least one battery pack working normally to maintain the standby operation of the photo-storage unit so that it does not enter a sleep state.

[0167] That is, when each photovoltaic storage unit includes multiple battery packs and the low power consumption control strategy is the first low power consumption control strategy, please continue to refer to Figure 7 The above step 1031 further includes: shutting down the drive of part of the battery packs in each of the photo-storage units and disconnecting the corresponding relays.

[0168] Among them, the battery pack that needs to be shut down can be selected according to the SOC size of each battery pack in the photovoltaic storage unit. For example, in order of SOC from large to small, the battery pack with a larger SOC has higher priority to be retained, and the battery pack with a smaller SOC has higher priority to be shut down. For the battery pack that needs to be retained, there is no need to turn off its drive and corresponding relays, while for the battery pack that needs to be shut down, its drive and corresponding relays need to be turned off. When there are multiple reserved battery packs in the photovoltaic storage unit, these battery packs can take turns to provide standby power to the photovoltaic storage unit. For example, the power supply order and the power supply duration of each power supply are determined according to the SOC size of each battery pack, and the corresponding photovoltaic storage unit is provided with standby energy according to the power supply order and power supply duration to maintain its standby operation.

[0169] In addition, after entering the low-power working mode, the photovoltaic storage system can monitor the changes in the backup power demand information, energy storage working mode, photovoltaic power supply voltage, remaining total power and load power of the photovoltaic storage system in real time and analyze them. Once the loss reduction conditions are not met, the photovoltaic storage system is controlled to exit the low-power working mode, such as turning on the drive of the inverter and the drive of the battery pack that were previously turned off, closing the relay, etc., to achieve flexible switching between the low-power working mode and the normal working mode.

[0170] From the above, it can be seen that the control method of the photovoltaic storage system provided in the embodiment of the present application, the photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit, the photovoltaic storage unit and the power grid are used to supply power to the load, each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic module connected to the inverter. When the photovoltaic storage system is in a grid-connected operation state and a normal working mode, the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all battery packs and the load power of the load are obtained; according to the photovoltaic power supply voltage, the remaining total power and the load power, it is determined whether the photovoltaic storage system needs to execute a low-power control strategy; if the low-power control strategy needs to be executed, the low-power control strategy is executed on the photovoltaic storage unit to control the photovoltaic storage system to enter a low-power working mode, so as to avoid the meaningless operation of the photovoltaic storage unit or the situation where the operating power loss accounts for a large proportion, minimize the waste of system resources, improve the economy of electricity use, and have high flexibility.

[0171] According to the method described in the above embodiment, the present application also provides a control device for a photovoltaic storage system, which is used to execute the steps in the control method for the photovoltaic storage system. Figure 8 , Figure 8 : is a schematic diagram of the structure of the control device of the photovoltaic storage system provided in the embodiment of the present application. The control device 200 of the photovoltaic storage system is applied to an electronic device, the photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit, the photovoltaic storage unit and the power grid are used to supply power to the load, and each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic module connected to the inverter. The control device 200 of the photovoltaic storage system includes an acquisition unit 201, a judgment unit 202 and an execution unit 203, wherein:

[0172] The acquisition unit 201 is used to acquire the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all the battery packs and the load power of the load when the photovoltaic storage system is in a grid-connected operation state and a normal working mode;

[0173] A judgment unit 202 is used to judge whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power;

[0174] The execution unit 203 is used to execute the low power consumption control strategy on the photovoltaic storage unit if it is necessary to execute the low power consumption control strategy, so as to control the photovoltaic storage system to enter a low power consumption working mode.

[0175] In some embodiments, the determining unit 202 is specifically configured to:

[0176] Determining whether the photovoltaic power supply voltages of all the photovoltaic modules are less than a preset power supply voltage threshold, and the remaining total power is less than or equal to a preset discharge cut-off power;

[0177] If yes, it is determined that the solar energy storage system needs to execute a low power consumption control strategy;

[0178] If not, when the photovoltaic power supply voltage of all the photovoltaic components is less than the preset power supply voltage threshold and the remaining total power is greater than the preset discharge cut-off power, it is determined whether the photovoltaic storage system needs to execute a low power consumption control strategy based on the load power.

[0179] In some embodiments, the determining unit 202 is specifically configured to:

[0180] Determining whether the load power is less than a preset light load threshold;

[0181] When the load power is less than the preset light load threshold, determining that the photovoltaic storage system needs to execute a low power consumption control strategy;

[0182] When the load power is greater than or equal to the preset light-load threshold, it is determined that the photovoltaic storage system does not need to execute a low-power consumption control strategy.

[0183] In some embodiments, the control device 200 of the solar energy storage system further includes a monitoring unit for:

[0184] After the photovoltaic storage system enters the low power consumption working mode, monitoring the operation status of the photovoltaic storage system, the photovoltaic power supply voltage, the remaining total power and the change information of the load power;

[0185] If any of the photovoltaic power supply voltage changes to be greater than or equal to a preset power supply voltage threshold, or the operating state changes to an off-grid operation enabled state or an off-grid operation state, the photovoltaic storage system is controlled to enter the normal operating mode;

[0186] If the photovoltaic power supply voltage is less than the preset power supply voltage threshold and the operating state has not changed, the photovoltaic storage system is controlled to enter the normal operating mode according to the change information of the remaining total power and the load power.

[0187] In some embodiments, the monitoring unit is specifically used for:

[0188] When the remaining total power changes to be greater than the preset discharge cut-off power, and the load power changes to be greater than or equal to the preset light-load power threshold, the photovoltaic storage system is controlled to enter the normal working mode.

[0189] In some embodiments, the execution unit 203 is specifically used to:

[0190] Turning off the drives in all the inverters and disconnecting the relays in all the inverters;

[0191] Turn off the drivers in all the battery packs and disconnect the relays in all the battery packs.

[0192] In some embodiments, the acquisition unit 201 is further used to: acquire the backup power demand information and energy storage working mode of the photovoltaic storage system;

[0193] At this time, the judgment unit 202 is specifically used for:

[0194] Whether the photovoltaic storage system needs to execute a low power consumption control strategy is determined according to the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power.

[0195] In some embodiments, the low power consumption control strategy includes a first low power consumption control strategy and a second low power consumption control strategy, and the determination unit 202 is specifically configured to:

[0196] Determining whether the photovoltaic power supply voltage of all the photovoltaic modules is less than a preset power supply voltage threshold;

[0197] If both are less than the preset supply voltage threshold, determining whether the backup power demand information indicates that energy storage backup power is required;

[0198] If it is indicated that energy storage backup is required, judging whether the photovoltaic storage system needs to execute the first low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power;

[0199] If it is indicated that no energy storage backup power is required, it is determined whether the photovoltaic storage system needs to execute the second low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power.

[0200] In some embodiments, the determining unit 202 is specifically configured to:

[0201] Determining whether the energy storage working mode is a charging mode;

[0202] If it is in charging mode, when the remaining total power is greater than or equal to the preset charging cut-off power, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy;

[0203] If it is a discharge mode, when the remaining total power is less than or equal to the preset discharge cut-off power, or the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy.

[0204] In some embodiments, when it is determined that the first low power consumption control strategy needs to be executed, the execution unit 203 is specifically used to: shut down the drivers in all the inverters, and disconnect the relays in all the inverters;

[0205] When it is determined that the second low power control strategy needs to be executed, the execution unit 203 is specifically used to: turn off the drives in all the inverters and disconnect the relays in all the inverters; turn off the drives in all the battery packs and disconnect the relays in all the battery packs.

[0206] In some embodiments, when each of the energy storage units includes a plurality of the battery packs and it is determined that the first low power consumption control strategy needs to be executed, the execution unit 203 is further configured to:

[0207] Turn off the drive of some of the battery packs in each of the energy storage units and disconnect the corresponding relays.

[0208] It should be noted that the specific details of each module unit in the control device 200 of the above-mentioned photovoltaic storage system have been described in detail in the embodiment of the control method of the above-mentioned photovoltaic storage system, and will not be repeated here.

[0209] In some embodiments, the control device of the optical storage system in the embodiment of the present application may be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal device. Exemplarily, the electronic device may be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc. It may also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0210] In some embodiments, Fig. 9As shown, an embodiment of the present application also provides an electronic device 300, including a processor 301, a memory 302, and a computer program stored in the memory 302 and executable on the processor 301. When the program is executed by the processor 301, each process of the control method embodiment of the above-mentioned photovoltaic storage system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0211] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0212] Fig.10 A schematic diagram of the hardware structure of an electronic device to implement an embodiment of the present application.

[0213] The electronic device 400 includes but is not limited to: a radio frequency unit 401, a network module 402, an audio output unit 403, an input unit 404, a sensor 405, a display unit 406, a user input unit 407, an interface unit 408, a memory 409, a processor 410 and other components.

[0214] Those skilled in the art will appreciate that the electronic device 400 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 410 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig.10 The electronic device structure shown in the figure does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0215] It should be understood that in the embodiment of the present application, the input unit 404 may include a graphics processor (Graphics Processing Unit, GPU) 4041 and a microphone 4042, and the graphics processor 4041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 406 may include a display panel 4061, and the display panel 4061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 407 includes a touch panel 4071 and at least one of other input devices 4072. The touch panel 4071 is also called a touch screen. The touch panel 4071 may include two parts: a touch detection device and a touch controller. Other input devices 4072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0216] The memory 409 can be used to store software programs and various data. The memory 409 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 409 may include a volatile memory or a non-volatile memory, or the memory 409 may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 409 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0217] The processor 410 may include one or more processing units; the processor 410 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 410.

[0218] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the control method embodiment of the above-mentioned optical storage system are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0219] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0220] An embodiment of the present application further provides a computer program product, including a computer program, which implements the control method of the above-mentioned optical storage system when executed by a processor.

[0221] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0222] It should be noted that, in this article, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0223] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0224] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0225] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0226] In the description of the present application, “plurality” means two or more.

[0227] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0228] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control method for a photovoltaic storage system, characterized in that: The photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit, wherein the photovoltaic storage unit and the power grid are used to supply power to the load, and each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic assembly connected to the inverter. The control method includes: When the photovoltaic storage system is in a grid-connected operation state and a normal working mode, the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all the battery packs and the load power of the load are obtained. The grid-connected operation state refers to the operation state when the power grid is connected to the photovoltaic storage system as a power supply source; Determining whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power; If it is necessary to execute a low power consumption control strategy, the low power consumption control strategy is executed on the optical storage unit to control the optical storage system to enter a low power consumption working mode; The control method further comprises: Obtaining backup power demand information and energy storage working mode of the photovoltaic storage system; The step of judging whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power includes: judging whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power; The low power consumption control strategy includes a first low power consumption control strategy and a second low power consumption control strategy, and under the first low power consumption control strategy, the photovoltaic storage system is in a non-sleep state, and under the second low power consumption control strategy, the photovoltaic storage system is in a sleep state; When it is determined that the first low-power control strategy needs to be executed, the low-power control strategy is executed on the photovoltaic storage unit to control the photovoltaic storage system to enter a low-power operation mode, including: turning off the drivers in all the inverters and disconnecting the relays in all the inverters; When it is determined that the second low-power control strategy needs to be executed, the low-power control strategy is executed on the photovoltaic storage unit to control the photovoltaic storage system to enter a low-power operation mode, including: turning off all the drives in the inverter and disconnecting all the relays in the inverter; turning off all the drives in the battery pack and disconnecting all the relays in the battery pack.

2. The control method of the photovoltaic storage system according to claim 1, characterized in that: When the optical storage system enters the low power consumption working mode, the method further includes: Monitoring the operating status of the photovoltaic storage system, the photovoltaic power supply voltage, the remaining total power and the change information of the load power; If any of the photovoltaic power supply voltage changes to be greater than or equal to a preset power supply voltage threshold, or the operating state changes to an off-grid operation enabled state or an off-grid operation state, the photovoltaic storage system is controlled to enter the normal operating mode; If the photovoltaic power supply voltage is less than the preset power supply voltage threshold and the operating state has not changed, the photovoltaic storage system is controlled to enter the normal operating mode according to the change information of the remaining total power and the load power.

3. The control method of the photovoltaic storage system according to claim 2, characterized in that: The controlling the photovoltaic storage system to enter the normal working mode according to the change information of the remaining total power and the load power includes: When the remaining total power changes to be greater than the preset discharge cut-off power, and the load power changes to be greater than or equal to the preset light-load power threshold, the photovoltaic storage system is controlled to enter the normal working mode.

4. The control method of the photovoltaic storage system according to claim 1, characterized in that: The determining whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power includes: Determining whether the photovoltaic power supply voltage of all the photovoltaic modules is less than a preset power supply voltage threshold; If both are less than the preset supply voltage threshold, determining whether the backup power demand information indicates that energy storage backup power is required; If it is indicated that energy storage backup is required, judging whether the photovoltaic storage system needs to execute the first low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power; If it is indicated that no energy storage backup power is required, it is determined whether the photovoltaic storage system needs to execute the second low power consumption control strategy according to the energy storage working mode, the remaining total power and the load power.

5. The control method of the photovoltaic storage system according to claim 4, characterized in that: The determining, according to the energy storage working mode, the remaining total power and the load power, whether the photovoltaic storage system needs to execute the first low power consumption control strategy includes: Determining whether the energy storage working mode is a charging mode; If it is in charging mode, when the remaining total power is greater than or equal to the preset charging cut-off power, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy; If it is a discharge mode, when the remaining total power is less than or equal to the preset discharge cut-off power, or the remaining total power is greater than the preset discharge cut-off power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic storage system needs to execute the first low power consumption control strategy.

6. The control method of the photovoltaic storage system according to claim 1, characterized in that: When each of the light storage units includes a plurality of the battery packs and it is determined that the first low power consumption control strategy needs to be executed, the low power consumption control strategy is executed on the light storage unit to control the light storage system to enter a low power consumption working mode, and further includes: Turn off the drive of some of the battery packs in each of the photo-storage units and disconnect the corresponding relays.

7. A control device for a photovoltaic storage system, characterized in that: The photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit, wherein the photovoltaic storage unit and the power grid are used to supply power to the load, each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic assembly connected to the inverter, and the control device includes: An acquisition unit, used for acquiring the photovoltaic power supply voltage of the photovoltaic module, the remaining total power of all the battery packs and the load power of the load when the photovoltaic storage system is in a grid-connected operation state and a normal working mode, wherein the grid-connected operation state refers to the operation state when the power grid is connected to the photovoltaic storage system as a power supply source; A judgment unit, used for judging whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the photovoltaic power supply voltage, the remaining total power and the load power; An execution unit, configured to execute the low power consumption control strategy on the optical storage unit if it is necessary to execute the low power consumption control strategy, so as to control the optical storage system to enter a low power consumption working mode; The acquisition unit is also used to: acquire the backup power demand information and energy storage working mode of the photovoltaic storage system; The judging unit is specifically used for: Determine whether the photovoltaic storage system needs to execute a low power consumption control strategy according to the backup power demand information, the energy storage working mode, the photovoltaic power supply voltage, the remaining total power and the load power; The low power consumption control strategy includes a first low power consumption control strategy and a second low power consumption control strategy, and under the first low power consumption control strategy, the photovoltaic storage system is in a non-sleep state, and under the second low power consumption control strategy, the photovoltaic storage system is in a sleep state; When it is determined that the first low power consumption control strategy needs to be executed, the execution unit is used to shut down the drivers in all the inverters and disconnect the relays in all the inverters; When it is determined that the second low-power control strategy needs to be executed, the execution unit is used to turn off the drives in all the inverters and disconnect the relays in all the inverters; turn off the drives in all the battery packs and disconnect the relays in all the battery packs.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the photovoltaic storage system according to any one of claims 1 to 6 is implemented.

9. A solar energy storage system, characterized in that: The photovoltaic storage system includes a load, a power grid and at least one photovoltaic storage unit, wherein the photovoltaic storage unit and the power grid are used to supply power to the load, and each photovoltaic storage unit includes an inverter, at least one battery pack connected to the inverter, and a photovoltaic module connected to the inverter; The photovoltaic storage system also includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the control method of the photovoltaic storage system according to any one of claims 1 to 6 is implemented.

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