Control method and system for power generation system

Abstract

The present application belongs to the field of photovoltaic systems. Disclosed are a control method and system for a power generation system. The control method for a power generation system comprises: acquiring the categories of power generation modules, an operating scenario of a power generation system, and backup power requirements of the power generation system, wherein the operating scenario comprises an off-grid scenario or an on-grid scenario; and on the basis of the categories, the operating scenario and the backup power requirements, controlling at least one of an operating state of each power generation module and an operating state of each battery pack, wherein the operating state comprises a first energy-saving state, a second energy-saving state or a normal operating state.

Description

Control methods and systems for power generation systems

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Chinese patent applications No. 2024114519972, filed on October 17, 2024 and No. 202410498077X, filed on April 23, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of photovoltaic systems, and more specifically, to a control method and system for a power generation system. Background Technology

[0004] During operation, power generation modules can operate in various scenarios, including off-grid and grid-connected modes. In related technologies, factors such as load power and photovoltaic power in each scenario can cause power generation modules to experience prolonged periods of meaningless standby, a high ratio of system equipment losses to battery discharge power, or the majority of battery output energy being used for standby power losses. All of these issues lead to energy waste, increased electricity costs, and ultimately negatively impact the user experience. Summary of the Invention

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a control method, device, and power generation system for a power generation system. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as the power generation module being in a standby state for a long time without any meaning, the ratio of system equipment loss to battery discharge power being large, or the majority of the energy output by the battery being used for its own equipment standby loss, thereby saving energy consumption and significantly reducing electricity costs.

[0006] In a first aspect, this application provides a control method for a power generation system, the power generation system including at least one power generation module, each power generation module including an energy storage system and an inverter connected to the energy storage system, each energy storage system including at least one battery pack, the method comprising:

[0007] The system obtains the category of the power generation module, the operating scenario of the power generation system, and the backup power requirement of the power generation system; the operating scenario includes off-grid scenario or grid-connected scenario; the category includes pure energy storage category or non-pure energy storage category, and the power generation system of non-pure energy storage category also includes photovoltaic system;

[0008] Based on the category, the working scenario, and the backup power requirement, control at least one of the working states of each of the power generation modules and each of the battery packs; the working states include: a first energy-saving state, a second energy-saving state, or a normal working state.

[0009] According to the control method of the power generation system in this application, by combining the off-grid and grid-connected scenarios and the presence or absence of backup power requirements, the working state of the power generation module and the battery pack is adjusted. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as the power generation module being in a long-term meaningless standby, the system equipment loss accounting for a large ratio of battery discharge power, or the majority of the energy output by the battery being used for its own equipment standby loss. This saves energy consumption, significantly reduces electricity costs, and thus improves the user experience.

[0010] Secondly, this application provides a control device for a power generation system, the power generation system including at least one power generation module, each power generation module including an energy storage system and an inverter connected to the energy storage system, each energy storage system including at least one battery pack, the device comprising:

[0011] The first processing module is used to obtain the category of the power generation module, the working scenario of the power generation system, and the backup power requirement of the power generation system; the working scenario includes off-grid scenario or grid-connected scenario; the category includes pure storage category or non-pure storage category, and the power generation system of non-pure storage category also includes photovoltaic system;

[0012] The second processing module is used to control at least one of the working states of each of the power generation modules and each of the battery packs based on the category, the working scenario and the backup power requirement; the working states include: a first energy-saving state, a second energy-saving state or a normal working state.

[0013] The control device for the power generation system according to this application adjusts the working state of the power generation module and battery pack by combining off-grid and grid-connected scenarios and whether there is a backup power requirement. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as the power generation module being in a long-term meaningless standby, the system equipment loss accounting for a large ratio of battery discharge power, or the majority of the energy output by the battery being used for its own equipment standby loss. This saves energy consumption, significantly reduces electricity costs, and thus improves the user experience.

[0014] Thirdly, this application provides a power generation system, comprising:

[0015] At least one power generation module, each power generation module including an energy storage system and an inverter connected to the energy storage system, each energy storage system including at least one battery pack;

[0016] The control device for the power generation system as described in the second aspect is electrically connected to the power generation module.

[0017] According to the power generation system of this application, by combining off-grid and grid-connected scenarios and whether or not there is a backup power requirement, the working state of the power generation module and the battery pack can be adjusted. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as the power generation module being in a long-term meaningless standby, the system equipment loss accounting for a large ratio of battery discharge power, or the majority of the energy output by the battery being used for its own equipment standby loss. This saves energy consumption, significantly reduces electricity costs, and thus improves the user experience.

[0018] Fourthly, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the power generation system as described in the first aspect above.

[0019] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the control method for the power generation system as described in the first aspect above.

[0020] Sixthly, this application provides a control method for a photovoltaic-storage system, the photovoltaic-storage system including a load, a power grid, and at least one photovoltaic-storage unit, the photovoltaic-storage unit and the power grid being used to supply power to the load, each photovoltaic-storage unit including an inverter, at least one battery pack connected to the inverter, and a photovoltaic module connected to the inverter, the control method including:

[0021] When the photovoltaic and energy storage system is in grid-connected operation and normal operating 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.

[0022] Determine whether the photovoltaic energy storage system needs to implement a low-power control strategy based on the photovoltaic power supply voltage, the remaining total power, and the load power.

[0023] If a low-power control strategy is required, then the low-power control strategy is executed on the optical storage unit to control the optical storage system to enter a low-power operating mode.

[0024] In a seventh aspect, this application provides a control device for a photovoltaic-storage system, the photovoltaic-storage system including a load, a power grid, and at least one photovoltaic-storage unit, the photovoltaic-storage unit and the power grid being used to supply power to the load, each photovoltaic-storage unit including an inverter, at least one battery pack connected to the inverter, and a photovoltaic module connected to the inverter, the control device including:

[0025] The acquisition unit 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 grid-connected operation and normal operation mode.

[0026] The judgment unit is used to determine whether the photovoltaic energy storage system needs to implement a low-power control strategy based on the photovoltaic power supply voltage, the remaining total power, and the load power.

[0027] An execution unit is configured to execute the low-power control strategy on the optical storage unit if a low-power control strategy is required, so as to control the optical storage system to enter a low-power operating mode.

[0028] Eighthly, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the optical storage system described in any of the preceding claims.

[0029] Ninthly, this application provides a photovoltaic-storage system, including 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;

[0030] The optical 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, it implements the control method of the optical storage system described above. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 is a flowchart illustrating one of the control methods for a power generation system provided in an embodiment of this application;

[0033] Figure 2 is a second schematic flowchart of the control method for the power generation system provided in the embodiments of this application;

[0034] Figure 3 is a third schematic flowchart of the control method for the power generation system provided in the embodiments of this application;

[0035] Figure 4 is a schematic diagram of the structure of the control device of the power generation system provided in the embodiment of this application;

[0036] Figure 5 is a schematic diagram of one of the power generation systems provided in an embodiment of this application;

[0037] Figure 6 is a second schematic diagram of the power generation system provided in an embodiment of this application;

[0038] Figure 7 is a third schematic diagram of the power generation system provided in the embodiment of this application;

[0039] Figure 8 is a fourth structural schematic diagram of the power generation system provided in the embodiment of this application;

[0040] Figure 9 is the fifth structural schematic diagram of the power generation system provided in the embodiment of this application;

[0041] Figure 10 is a sixth schematic diagram of the power generation system provided in the embodiment of this application;

[0042] Figure 11 is the seventh structural schematic diagram of the power generation system provided in the embodiment of this application;

[0043] Figure 12 is the eighth schematic diagram of the power generation system provided in the embodiment of this application;

[0044] Figure 13 is a flowchart illustrating the control method of the photovoltaic energy storage system provided in an embodiment of this application;

[0045] Figure 14 is a schematic diagram of the structure of the photovoltaic energy storage system provided in an embodiment of this application;

[0046] Figure 15 is a schematic diagram of the control method of the photovoltaic energy storage system provided in the embodiment of this application;

[0047] Figure 16 is another schematic flowchart of the control method of the photovoltaic energy storage system provided in the embodiment of this application;

[0048] Figure 17 is another schematic flowchart of the control method of the photovoltaic energy storage system provided in the embodiment of this application;

[0049] Figure 18 is another schematic diagram of the control method of the photovoltaic energy storage system provided in the embodiment of this application;

[0050] Figure 19 is another schematic flowchart of the control method of the photovoltaic energy storage system provided in the embodiment of this application;

[0051] Figure 20 is a schematic diagram of the control device of the photovoltaic energy storage system provided in an embodiment of this application;

[0052] Figure 21 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application;

[0053] Figure 22 is a schematic diagram of the hardware structure of the electronic device provided in an embodiment of this application. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0055] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0056] The control method, control device, electronic equipment, and readable storage medium of the power generation system provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0057] The control method of the power generation system can be applied to the terminal, and can be executed by the hardware or software in the terminal.

[0058] The power generation system control method provided in this application embodiment can be executed by an electronic device or a functional module or entity in an electronic device that can implement the power generation system control method. The electronic devices mentioned in this application embodiment include, but are not limited to, mobile phones, tablets, computers, cameras, and wearable devices. The power generation system control method provided in this application embodiment will be described below using an electronic device as the execution subject as an example.

[0059] As shown in Figure 1, the control method of the power generation system includes steps 110 and 120.

[0060] Step 110: Obtain the type of power generation module, the working scenario of the power generation system, and the backup power requirements of the power generation system;

[0061] In this step, as shown in Figure 5, the power generation system includes at least one power generation module.

[0062] The types of power generation modules can include pure energy storage or non-pure energy storage.

[0063] For pure energy storage type power generation modules, this includes energy storage systems and inverters connected to the energy storage systems.

[0064] For non-pure energy storage generation modules, the components include: photovoltaic system, energy storage system and inverter, wherein the inverter is connected to both the photovoltaic system and the energy storage system.

[0065] The energy storage system includes at least one battery pack, such as battery 1 to battery N as shown in Figure 5, where N is a positive integer.

[0066] Each power generation module is connected to the load.

[0067] In a grid-connected scenario, each power generation module can be connected to the power grid via an AC line.

[0068] In actual implementation, a meter or gateway can be installed at the grid connection point to collect electrical signals.

[0069] The working scenarios include: off-grid scenarios or grid-connected scenarios.

[0070] Backup power requirements include: having backup power requirements or not having backup power requirements.

[0071] In some embodiments, grid connection requires backup power in scenarios including Gateway, but not in scenarios including electricity meters.

[0072] When a power generation system includes multiple power generation modules, all of the power generation modules in the power generation system may be pure energy storage modules, or all of them may be non-pure energy storage modules, or they may include some pure energy storage modules and some non-pure energy storage modules.

[0073] In actual control, each power generation module can be controlled independently.

[0074] Step 120 controls at least one of the following based on category, working scenario, and backup power requirements: the working status of each power generation module and the working status of each battery pack.

[0075] In this step, the operating states include: first energy-saving state, second energy-saving state, or normal operating state.

[0076] Among them, the first energy-saving state and the second energy-saving state are two different working states that are different from the normal working state.

[0077] Under different operating conditions, the operating conditions of each power generation module, the inverter included in the power generation module, and the battery pack may differ.

[0078] In actual implementation, the power generation module or battery pack can be put into the corresponding energy-saving state by controlling unnecessary components in the power generation module or battery pack to not work, shut down, or operate at a lower power. This reduces the meaningless standby time of the power generation module, reduces the ratio of system equipment loss to battery discharge power, or reduces the proportion of battery output energy used for its own equipment standby loss.

[0079] It should be noted that, compared to the first energy-saving state, the second energy-saving state, in addition to reducing energy consumption, can also improve the overall system response rate when exiting the second energy-saving state by controlling some components to maintain their power-on state.

[0080] In some embodiments, controlling entry into a first energy-saving state may include:

[0081] The inverter corresponding to the energy storage system that has entered the first energy-saving state is shut down, and / or the battery pack included in the energy storage system is shut down.

[0082] In this embodiment, controlling an energy storage system to enter a first energy-saving state can be manifested as controlling the inverter corresponding to the energy storage system to shut down; or controlling the battery pack included in the energy storage system to shut down; or controlling the inverter corresponding to the energy storage system to shut down and controlling the battery pack included in the energy storage system to shut down.

[0083] In some embodiments, the battery pack can be controlled to hibernate after it is powered off.

[0084] According to the control method of the power generation system provided in the embodiments of this application, by controlling the inverter corresponding to the energy storage system to shut down and / or controlling the battery pack included in the energy storage system to shut down, the meaningless standby time of the power generation module can be reduced, the ratio of system equipment loss to battery discharge power can be reduced, and the proportion of battery output energy used for its own equipment standby loss can be reduced, thereby achieving energy saving and loss reduction and reducing electricity costs.

[0085] In some embodiments, controlling entry into a second energy-saving state may include:

[0086] Control the power generation module and / or the power module inside the battery pack that enters the second energy-saving state to block the waveform or operate based on the target frequency, which is lower than the normal operating frequency, and control the battery pack included in the energy storage system to maintain power supply.

[0087] In this embodiment, the target frequency is lower than the frequency at which the power module operates normally.

[0088] The target frequency can be user-defined.

[0089] In actual execution, as shown in Figure 12, controlling the battery pack to maintain power supply can be manifested as controlling the internal control unit of the battery pack to maintain power supply.

[0090] It should be noted that when the power module is blocked or operates at a lower frequency, and the battery pack continues to supply power, if the system needs to exit the second energy-saving state under certain conditions, there is no need to go through the complete power-on relay self-test process. Compared with situations such as inverter shutdown or battery pack power failure shutdown, the system response and switching speed are relatively faster.

[0091] According to the control method of the power generation system provided in the embodiments of this application, by controlling the power generation module and / or the power module inside the battery pack that enters the second energy-saving state to block the wave or operate based on the target frequency, the target frequency is lower than the normal operating frequency, and the battery pack included in the energy storage system is controlled to maintain power supply, on the basis of achieving energy saving and loss reduction, it can also achieve rapid response switching when the system needs to exit the second energy-saving state, improve the switching rate, and maintain the stable and normal operation of the system.

[0092] In actual operation, the working status of each power generation module can be controlled independently, and each energy storage system under the same power generation module, as well as each battery pack under the same energy storage system, can be controlled independently.

[0093] In this application, the power generation status of the photovoltaic system is determined based on the first operating parameters, such as whether it can work normally. By combining the power generation status of the photovoltaic system with off-grid and grid-connected scenarios and whether there is a backup power requirement, it is determined whether the power generation module and battery pack need to maintain a normal working state. In the case where it is not necessary to maintain a normal working state, while ensuring that the power generation system can meet the power supply demand, it enters the corresponding energy-saving state. This reduces the probability of problems such as the power generation module being in a standby state for a long time without any meaning, the system equipment loss accounting for a large ratio of battery discharge power, or the majority of the energy output by the battery being used for its own equipment standby loss. This saves energy consumption and thus significantly reduces electricity costs.

[0094] According to the control method of the power generation system provided in the embodiments of this application, by combining the off-grid and grid-connected scenarios and the presence or absence of backup power requirements, the working state of the power generation module and the battery pack is adjusted. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as the power generation module being in a long-term meaningless standby, the system equipment loss accounting for a large ratio of battery discharge power, or the majority of the energy output by the battery being used for its own equipment standby loss. This saves energy consumption, significantly reduces electricity costs, and thus improves the user experience.

[0095] In some embodiments, step 120 may include:

[0096] Obtain the first operating parameters of the photovoltaic system in a non-pure energy storage type power generation module;

[0097] The non-pure storage type power generation module with the first working parameter greater than the first threshold is identified as the first power generation module, and the remaining power generation modules other than the first power generation module are identified as the second power generation module.

[0098] Based on the working scenario and backup power requirements, control at least one of the working states of the second power generation module and the working states of each battery pack in the second power generation module.

[0099] In this embodiment, the first operating parameter is used to characterize the operating data of the photovoltaic system, and may include, but is not limited to, photovoltaic voltage, photovoltaic current, and photovoltaic power.

[0100] The first threshold is a small value, and the specific value of the first threshold can be customized by the user.

[0101] The category of the first threshold should be consistent with the category of the first working parameter.

[0102] Taking photovoltaic current as the first operating parameter as an example, the first threshold can be the minimum current or a current value that is close to the minimum current.

[0103] When the first operating parameter is greater than the first threshold, the power generation capacity of the photovoltaic system is considered normal. It can be approximated that the photovoltaic power generation is sufficient to compensate for standby losses, and there is no need to control the relevant components to enter the energy-saving state.

[0104] When the first operating parameter is not greater than the first threshold, the photovoltaic system has a relatively small power generation capacity.

[0105] The power generation module whose first operating parameter is greater than the first threshold is identified as the first power generation module.

[0106] The number of first power generation modules can be zero, one, or more. In some embodiments, the number of first power generation modules may also be the total number of power generation modules included in the power generation system.

[0107] The second power generation module is the remaining power generation module excluding the first power generation module.

[0108] The second power generation module is the module that needs to determine whether a loss reduction strategy needs to be implemented.

[0109] The number of second power generation modules can be zero, one, or more. In some embodiments, the number of second power generation modules may also be the total number of power generation modules included in the power generation system.

[0110] It is understandable that, in a scenario where all power generation modules in a power generation system are pure energy storage modules, all power generation modules are secondary power generation modules.

[0111] In a scenario where the power generation system includes some pure energy storage modules and some non-pure energy storage modules, the pure energy storage modules are all second power generation modules. Among the non-pure energy storage modules, the power generation module whose first operating parameter is not greater than the first threshold can be a second power generation module.

[0112] In the scenario where all the power generation modules included in the power generation system are not pure energy storage modules, they can be directly classified based on the first operating parameters of the photovoltaic system included in each power generation module, and the power generation modules whose first operating parameters are not greater than the first threshold are identified as the second power generation modules.

[0113] In some embodiments, after determining the power generation modules of non-pure storage type with a first operating parameter greater than a first threshold as the first power generation module, and determining the remaining power generation modules other than the first power generation module as the second power generation module, the method may further include:

[0114] Maintain the first power generation module in normal working condition.

[0115] For the second power generation module, the operating status of the second power generation module and / or the operating status of the battery pack in the second power generation module can be controlled based on the working scenario and backup power requirements.

[0116] The following describes the specific control methods for the operating status of the second power generation module and / or the battery pack in the second power generation module.

[0117] In some embodiments, controlling at least one of the operating states of the second power generation module and the operating states of each battery pack in the second power generation module, based on the working scenario and backup power requirements, may include:

[0118] In grid-connected scenarios, the working status of each second power generation module and / or each battery pack is controlled based on backup power demand and the charging and discharging status of the energy storage system.

[0119] In off-grid scenarios, the operating status of each second power generation module and / or each battery pack is controlled based on the load power of the power generation system.

[0120] In this embodiment, the charge / discharge state includes a charging state or a discharging state.

[0121] In grid-connected scenarios, the power generation module can be controlled to enter the corresponding working state under different conditions by combining the power generation status of the power generation module, the backup power demand, and the charging and discharging status of the energy storage system.

[0122] As shown in Figure 2, in some embodiments, under grid-connected scenarios, controlling the operating state of each second power generation module and / or each battery pack based on backup power demand and the charging and discharging state of the energy storage system may include:

[0123] Based on the charging and discharging state, obtain the target judgment conditions;

[0124] Based on the target judgment conditions, charging and discharging status and backup power requirements, control the working status of each second power generation module and / or each battery pack.

[0125] In this embodiment,

[0126] The target judgment condition is used to determine whether the conditions for implementing the loss reduction strategy are met.

[0127] Among them, loss reduction strategies can include a variety of different loss reduction strategies. Based on different loss reduction strategies, each component in the power generation module can be controlled to enter the corresponding working state.

[0128] As shown in Figure 3, various loss reduction strategies can include: loss reduction strategy 1, loss reduction strategy 2, loss reduction strategy 3 and loss reduction strategy 4, etc. Different loss reduction strategies may be used in different scenarios or in the same scenario.

[0129] The criteria for determining the target can be adjusted based on the charging and discharging states.

[0130] Understandably, if the target judgment conditions determine that the loss reduction strategy can be implemented, one or more second power generation modules in the power generation system can be controlled to enter the energy-saving state.

[0131] If the target judgment conditions determine that the loss reduction strategy cannot be implemented, each second power generation module can be kept in normal working condition, or other operating parameters can be combined to further determine whether the loss reduction strategy can be implemented.

[0132] In some embodiments, if it is determined based on the target judgment condition that the loss reduction strategy is not met, a portion of the second power generation modules (such as two units) may be kept under load, and the non-full-power second power generation modules may be controlled by a single battery pack.

[0133] Under different loss reduction strategies, the operating modes of the components that enter the energy-saving state may also differ.

[0134] In a grid-connected scenario, for each of the second power generation modules included in the power generation system, the target judgment conditions can be obtained based on the current charging and discharging state of the energy storage system included in each second power generation module to determine whether it meets the conditions for executing the loss reduction strategy. If it is determined that the conditions for entering the loss reduction strategy are met, the working state of each second power generation module is controlled in combination with the charging and discharging state and backup power demand.

[0135] In off-grid scenarios, the operating status of the second power generation module and the battery pack can be adjusted based on the load power of the power generation system. When the operating status of the battery pack changes, the operating status of its corresponding second power generation module will also change accordingly.

[0136] The following explains how to determine the criteria for judging the target.

[0137] In some embodiments, obtaining the target determination condition based on the charge / discharge state may include:

[0138] The first total charge value is obtained by weighted summation of the states of charge of each energy storage system.

[0139] When the charging / discharging state is the charging state, the target judgment condition is determined to be that the first total charge value is not less than the first charge threshold.

[0140] When the charging / discharging state is in the discharging state, the target judgment condition is determined to be that the first total charge value is not greater than the second charge threshold, and / or the load power corresponding to the power generation system is not greater than the second threshold.

[0141] In this embodiment, the first charge threshold may include a charging threshold or a value close to the charging threshold, or it may be based on a user-defined value.

[0142] The second charge threshold may include a discharge threshold or a value close to the discharge threshold, or it may be based on a user-defined value.

[0143] The first total charge value is the overall remaining SOC of the multiple energy storage systems included in the power generation system. As shown in Figure 3, in actual implementation, the overall remaining SOC of a single energy storage system can be calculated first, and then the overall remaining SOC of each energy storage system can be weighted and summed to obtain the first total charge value.

[0144] Calculating the overall remaining SOC of a single energy storage system can include weighted summation of the remaining SOC of each battery pack in the same energy storage system; for example, weighted summation of SOC1, SOC2, ..., SOCN included in the power generation module 1 shown in Figure 3 to obtain the overall remaining SOC of power generation module 1, and then weighted summation of the overall remaining SOC corresponding to power generation module 1 to power generation module N to obtain the first total charge value.

[0145] During charging, if the first total charge value is less than the first charge threshold, the current charging is considered normal and the current operating parameters can be maintained unchanged. If the first total charge value is not less than the first charge threshold, it can be approximately considered that the charging threshold is about to be exceeded or has already been exceeded, and charging should be stopped. This situation confirms that the target judgment condition is met, and it can be considered whether to control the relevant power generation module to enter the energy-saving state.

[0146] In the discharge state, when the first total charge value is greater than the second charge threshold, the current discharge is considered normal and the current operating parameters can be maintained unchanged; when the first total charge value is not greater than the second charge threshold, it can be approximately considered that the discharge threshold is about to be exceeded or has already been exceeded, and the discharge should be stopped. This situation confirms that the target judgment condition is met, and it can be considered whether to control the relevant power generation module to enter the energy-saving state.

[0147] In some embodiments, during the discharge state, the magnitude of the load power corresponding to the power generation system can also be used to determine whether to enter the energy-saving state.

[0148] The second threshold is a critical value used to determine whether the current load is light. The specific value of the second threshold can be user-defined.

[0149] Referring to Figure 2, if the load power is not greater than the second threshold, the current load can be approximated as a light load. If the energy storage system is in a discharging state and the load is light, even if the first total charge value is greater than the first charge threshold, it can be approximated as a system that does not need to supply power to meet the basic power supply requirements. Therefore, the target judgment condition can also be considered, and it can be considered whether to control the relevant power generation module to enter the energy-saving state.

[0150] The following sections explain the loss reduction strategies for various scenarios.

[0151] I. Control Logic under Grid Connection Without Backup Power Requirement

[0152] In some embodiments, controlling the operating state of each second power generation module and / or each battery pack based on target judgment conditions, charging / discharging state, and backup power requirements may include:

[0153] When there is no need for backup power and the target judgment conditions are met, control each second power generation module to enter the first energy-saving state;

[0154] When there is no backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the discharging state, control at least some of the second power generation modules to enter the first energy-saving state.

[0155] When there is no backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the charging state, control each second power generation module to maintain normal operation.

[0156] In this embodiment, referring to Figure 2, when there is no backup power requirement for grid connection (i.e., grid-connected operation and non-backup power scenario), for the charging state, when the first total charge value is not less than the first charge threshold, it is considered that the target judgment condition is met, and all the second power generation modules of the power generation system are controlled to enter the first energy-saving state, that is, all the inverters of the second power generation modules are controlled to shut down, and / or all the battery packs of the second power generation modules are controlled to shut down.

[0157] When there is no backup power requirement for grid connection, in the discharge state, if the first total charge value is not greater than the second charge threshold, or the load power is not greater than the second threshold, it is considered that the target judgment condition is met, and all the second power generation modules of the power generation system are controlled to enter the first energy-saving state, that is, all the inverters of the second power generation modules are controlled to shut down, and / or all the battery packs of the second power generation modules are controlled to shut down.

[0158] If there is no need for backup power when connected to the grid and the target judgment conditions are not met, the charging and discharging status can be further considered to determine whether a loss reduction strategy can be implemented.

[0159] In the charging state, if it is determined that there is no backup power requirement for grid connection and the target judgment conditions are not met, the loss reduction strategy will not be implemented, and the power generation system will be controlled to maintain normal operation.

[0160] In the discharge state, when it is determined that there is no backup power requirement for grid connection and the target judgment conditions are not met, some of the second power generation modules can be controlled to enter the first energy-saving state, while other parts of the second power generation modules can be controlled to maintain normal operation.

[0161] For example, one or two of the multiple second power generation modules can be controlled to enter the first energy-saving state, while the remaining second power generation modules are controlled to maintain normal operation.

[0162] Referring again to Figure 2, in some embodiments, when there is no backup power requirement, the target judgment condition is not met, and the charging / discharging state is the discharging state, controlling at least some of the second power generation modules to enter the first energy-saving state may include:

[0163] Based on the load power corresponding to the power generation system, a first target power generation module is determined from all the second power generation modules; the sum of the load power of the first target power generation module and the load power of the first power generation module is not less than the load power.

[0164] The first target power generation module is controlled to enter the normal working state, and the remaining second power generation modules other than the first target power generation module are controlled to enter the first energy-saving state.

[0165] In this embodiment, the first target power generation module is a power generation module used to maintain normal operation.

[0166] The first target power generation module can be one or more of the second power generation modules, and the sum of the load power of the first target power generation module and the load power of the first power generation module should not be less than the load power in order to maintain normal power demand.

[0167] The load-carrying power corresponding to the power generation module is used to characterize the load-carrying capacity of the power generation module.

[0168] The load-carrying power of the power generation module mentioned in this article may include: the current output power of the power generation module, or the maximum output power of the power generation module, or the first target output power, etc.

[0169] The first target output power can be a value close to the maximum output power of the power generation module. The first target output power can be user-defined and is not limited herein. In some embodiments, the relationship between the sum of the load power of the first power generation module and the load power can be calculated first.

[0170] If the sum of the load power of the first power generation modules is not less than the load power, the number of the first target power generation modules can be 0, that is, all the second power generation modules are controlled to enter the first energy-saving state.

[0171] If the sum of the load power of the first power generation modules is less than the load power, the number of second power generation modules that need to maintain normal operation can be selected from the second power generation modules.

[0172] For example, in actual execution, the load power corresponding to each second power generation module can be obtained separately, and the load power can be accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is determined as the first target power generation module, and the first target power generation module is controlled to maintain normal operation. The remaining second power generation modules are controlled to enter the first energy-saving state, such as controlling the inverter inside the remaining second power generation module to shut down, and / or controlling the battery pack inside the remaining second power generation module to shut down, etc.

[0173] The specific accumulation process will be described in the examples below, and will not be repeated here.

[0174] II. Control Logic under Grid Connection with Backup Power Requirements

[0175] In some embodiments, controlling the operating state of each second power generation module and / or each battery pack based on target judgment conditions, charging / discharging state, and backup power requirements may include:

[0176] When there is a backup power requirement and the target judgment conditions are met, control each second power generation module to enter the second energy-saving state;

[0177] When there is a backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the discharging state, control at least some of the second power generation modules to enter the second energy-saving state.

[0178] When there is a backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the charging state, control each second power generation module to maintain normal operation.

[0179] In this embodiment, the methods for obtaining the target judgment conditions under the conditions of grid connection with backup power requirement and grid connection without backup power requirement, as well as the methods for judging whether the target judgment conditions are met, are the same and have been described in the above embodiments, and will not be repeated here.

[0180] Referring to Figure 2, when there is a backup power requirement for grid connection, for the charging state, when the first total charge value is not less than the first charge threshold, it is considered that the target judgment condition is met. All the second power generation modules of the control power generation system enter the second energy-saving state, such as controlling the power modules of the inverters inside all the second power generation modules to have no switching action or to work based on the target frequency, and controlling the control unit of the battery pack to keep supplying power.

[0181] When there is a backup power requirement for grid connection, for the discharge state, if the first total charge value is not greater than the second charge threshold, or the load power is not greater than the second threshold, it is considered that the target judgment condition is met, and all the second power generation modules of the power generation system are controlled to enter the second energy-saving state, such as controlling the power modules of the inverters inside all the second power generation modules to have no switching action or to operate based on the target frequency, and controlling the control unit of the battery pack to maintain power supply.

[0182] If there is a need for backup power when connected to the grid but the target judgment conditions are not met, the charging and discharging status can be further considered to determine whether a loss reduction strategy can be implemented.

[0183] In the charging state, if it is determined that there is a backup power demand for grid connection but the target judgment conditions are not met, the loss reduction strategy will not be implemented, and the power generation system will be controlled to maintain normal operation.

[0184] Referring to Figure 2, in the discharge state, when it is determined that there is a backup power requirement for grid connection and the target judgment condition is not met, some of the second power generation modules can be controlled to enter the second energy-saving state, while other parts of the second power generation modules can be controlled to maintain normal operation.

[0185] For example, one or two of the multiple second power generation modules can be controlled to enter the second energy-saving state, while the remaining second power generation modules can be controlled to maintain normal operation.

[0186] Referring again to Figure 2, in some embodiments, when there is a backup power requirement, the target judgment condition is not met, and the charging / discharging state is the discharging state, controlling at least some of the second power generation modules to enter the second energy-saving state may include:

[0187] Based on the load power corresponding to the power generation system, a second target power generation module is determined from all the second power generation modules; the sum of the load power of the second target power generation module and the load power of the first power generation module is not less than the load power.

[0188] Control the second target power generation module to enter the normal working state, and control the remaining second power generation modules (excluding the second target power generation module) to enter the second energy-saving state.

[0189] In this embodiment, the second target power generation module is a power generation module used to maintain normal operation.

[0190] The second target power generation module can be one or more of the total power generation modules, and the sum of the load power of the second target power generation module and the load power of the first power generation module should not be less than the load power in order to maintain normal power demand.

[0191] In some embodiments, the relationship between the sum of the load power of the first power generation module and the load power can be calculated first.

[0192] If the sum of the load power of the first power generation modules is not less than the load power, the number of the second target power generation modules can be 0, that is, all the second power generation modules are controlled to enter the second energy-saving state.

[0193] If the sum of the load power of the first power generation modules is less than the load power, the number of second power generation modules that need to maintain normal operation can be selected from the second power generation modules.

[0194] For example, in actual execution, the load power corresponding to each second power generation module can be obtained separately, and the load power can be accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The power generation module corresponding to the accumulated value is determined as the second target power generation module, and the second target power generation module is controlled to maintain normal operation. The remaining second power generation modules are controlled to enter the second energy-saving state, such as controlling the power module of the inverter inside the remaining second power generation module to have no switching action or to work based on the target frequency, and controlling the control unit of the battery pack inside the remaining power generation module to maintain power supply, etc.

[0195] The specific accumulation process is similar to the accumulation method corresponding to the first target power generation module, and will not be elaborated here.

[0196] III. Control Logic in Offline Scenarios

[0197] In some off-grid scenarios, controlling the operating state of each second power generation module and / or each battery pack based on the load power of the power generation system may include:

[0198] Based on the load power corresponding to the power generation system, the third target power generation module in each second power generation module is controlled to enter the second energy-saving state.

[0199] In this embodiment, in off-grid scenarios, there is no need to consider the charging and discharging status and backup power requirements; the decision to implement a loss reduction strategy can be made based on the load power corresponding to the power generation system.

[0200] Among them, the loss reduction strategy includes at least one of loss reduction strategy 3 (i.e., whole machine loss reduction strategy) and loss reduction strategy 4 (i.e., single battery pack loss reduction strategy).

[0201] The third target power generation module is the second power generation module used to enter the second energy-saving state.

[0202] The number of third target power generation modules can be one or more.

[0203] In actual implementation, at least one power generation module should be kept in normal working condition to maintain basic power supply.

[0204] In some embodiments, controlling the third target power generation module in each of the second power generation modules to enter a second energy-saving state based on the load power corresponding to the power generation system may include:

[0205] The load power of the second power generation module is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is determined as the fourth target power generation module, and the remaining second power generation modules other than the fourth target power generation module are determined as the third target power generation module.

[0206] Control the fourth target power generation module to maintain normal operation, and control the third target power generation module to enter the second energy-saving state.

[0207] In this embodiment, the fourth target power generation module is the remaining second power generation module excluding the third target power generation module among all the second power generation modules.

[0208] In some embodiments, the number of fourth target power generation modules can be at least one to maintain basic power supply.

[0209] In actual execution, the load power corresponding to each second power generation module can be obtained separately, and the load power can be accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The power generation module corresponding to the accumulated value is determined as the fourth target power generation module. The fourth target power generation module is controlled to maintain normal operation, and the remaining second power generation modules, i.e. the third target power generation module, are controlled to enter the second energy-saving state. For example, the power module of the inverter inside the third target power generation module is controlled to have no switching action or to operate based on the target frequency, and the control unit of the battery pack inside the remaining power generation modules is controlled to maintain power supply.

[0210] During the accumulation process, random accumulation or accumulation in a preset order can be used.

[0211] In some embodiments, in an off-grid scenario, controlling the operating state of each second power generation module and / or each battery pack based on the load power of the power generation system may include:

[0212] Based on the load power corresponding to each battery pack in the second power generation module that is in normal working condition, the working state of each battery pack in the second power generation module is controlled.

[0213] In this embodiment, the load-carrying power corresponding to the battery pack is used to characterize the load-carrying capacity of the battery pack.

[0214] The load power of the battery pack mentioned in this article may include: the current output power of the battery pack, or the maximum output power of the battery pack, or the second target output power, etc.

[0215] The second target output power can be a value that is close to the maximum output power of the battery pack. The second target output power can be user-defined, and this application does not limit it.

[0216] In actual operation, in addition to controlling the working status of the entire power generation module based on the overall load power of the second power generation module, the working status of each battery pack in the power generation module can also be controlled individually based on the load power of each battery pack included in the second power generation module.

[0217] In some embodiments, controlling the operating state of each battery pack in the second power generation module under normal operating conditions based on the load power corresponding to each battery pack in the second power generation module under normal operating conditions may include:

[0218] The first target battery pack in the control battery pack is put into the second energy-saving state, and the second target battery pack in the control battery pack other than the first target battery pack is kept in the normal working state.

[0219] In this embodiment, the number of second power generation modules that maintain normal operation can be one or more.

[0220] The first target battery pack is the battery pack used to enter the second energy-saving state.

[0221] The number of the first target battery packs can be one or more.

[0222] When all battery packs included in the same second power generation module enter the second energy-saving state, the second power generation module can be approximately considered to have entered the second energy-saving state.

[0223] The second target battery pack is the remaining battery packs excluding the first target battery pack.

[0224] In some embodiments, controlling a first target battery pack in a battery pack to enter a second energy-saving state, and controlling a second target battery pack other than the first target battery pack to maintain a normal operating state, may include:

[0225] The load power of the battery pack is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is determined as the second target battery pack, and the remaining battery packs in the battery pack other than the second target battery pack are determined as the first target battery pack.

[0226] The second target battery pack is controlled to maintain normal operation, while the first target battery pack is controlled to enter the second energy-saving state.

[0227] In this embodiment, the method for determining the second target battery pack is similar to the method for determining the fourth target power generation module.

[0228] For example, it can be accumulated randomly or in a preset order.

[0229] In some embodiments, the number of second target battery packs can be at least one.

[0230] In actual execution, the load power corresponding to each battery pack in the second power generation module can be obtained separately, and the load power can be accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is determined as the second target battery pack. The second target battery pack is controlled to maintain normal operation, and the remaining battery packs, i.e. the first target battery pack, are controlled to enter the second energy-saving state. For example, the power module of the inverter corresponding to the first target battery pack is controlled to have no switching action or to operate based on the target frequency, and the control unit of the first target battery pack is controlled to maintain power supply.

[0231] According to the control method of the power generation system provided in the embodiments of this application, in the off-grid scenario, based on the load power of the power generation module and / or battery pack and the corresponding load power of the power generation system, the working state of the power generation module can be controlled as a whole, or the working state of the battery pack can be controlled separately, so as to control non-essential components to enter the energy-saving state while meeting the load demand, reducing ineffective consumption, reducing electricity costs, and having high control flexibility and universality.

[0232] In some embodiments, the overall control of the second power generation module and the individual control of the battery pack can be performed independently of each other. For example, some of the second power generation modules can be controlled to enter the second energy-saving state; or one or more battery packs in one or more of the second power generation modules can be controlled to enter the second energy-saving state; or some of the second power generation modules can be controlled to enter the second energy-saving state while some of the battery packs in another part of the second power generation modules are controlled to enter the second energy-saving state.

[0233] In some embodiments, the second power generation module can be controlled as a whole first to control some of the second power generation modules to enter the second energy-saving state, and then the remaining second power generation modules that maintain normal operation can be controlled individually based on the battery pack to control some of the battery packs to enter the second energy-saving state.

[0234] The number of remaining power generation modules that maintain normal operation can be one or more.

[0235] Referring again to Figure 2, in some embodiments, in off-grid scenarios, controlling the operating state of each second power generation module and / or the operating state of each battery pack based on the load power of the power generation system may include:

[0236] Obtain the state of charge of each second power generation module;

[0237] The second power generation module whose state of charge is not greater than the second charge threshold enters the second energy-saving state, and the second power generation module whose state of charge is greater than the second charge threshold enters the normal operation state.

[0238] Based on the load power corresponding to the power generation system, the third target power generation module in the second power generation module whose state of charge is greater than the second state of charge threshold is controlled to enter the second energy-saving state.

[0239] When the number of second power generation modules in normal operation is 1, the operating status of each battery pack in the second power generation module in normal operation is controlled based on the standby power of each battery pack in the second power generation module in normal operation.

[0240] In this embodiment, the second charge threshold may include a discharge threshold or a value close to the discharge threshold, or it may be based on a user-defined value.

[0241] A state of charge not exceeding the second charge threshold indicates that the power output of the power generation module corresponding to this state of charge is low, or even zero.

[0242] For example, for a second power generation module whose state of charge is not greater than the second charge threshold, the load power of the second power generation module can be set to 0; for a second power generation module whose state of charge is greater than the second charge threshold, the actual load power of the second power generation module can be obtained.

[0243] In actual implementation, the state of charge of each second power generation module can be obtained separately and compared with the second charge threshold to control the second power generation module with lower load power to enter the second energy-saving state first.

[0244] For the remaining second power generation modules, i.e. the second power generation modules whose state of charge is greater than the second state of charge threshold, the third target power generation module is selected to enter the second energy-saving state by further combining its corresponding load power and the load power of the power generation system. The remaining fourth target power generation module temporarily remains in normal working state.

[0245] The method for determining the third target power generation module will be explained in the following embodiments, and will not be repeated here.

[0246] It should be noted that, in this embodiment, the number of fourth target power generation modules that maintain normal operation should be at least one.

[0247] For the fourth target power generation module, the operating status of each battery pack in the entire battery pack included in the fourth target power generation module can be controlled individually based on the load power corresponding to each battery pack. The specific control method has been described in the above embodiment and will not be repeated here.

[0248] It should be noted that, in some embodiments, the number of second target battery packs that maintain normal operation should be at least one, to ensure that at least one normal battery pack in the power generation system provides basic power supply.

[0249] The following explanation uses photovoltaic voltage as an example, which is the first operating parameter.

[0250] In actual execution, after determining the first power generation module and the second power generation module, each second power generation module is first used as an overall control unit. The state of charge of each second power generation module is then determined to be greater than the second charge threshold. N second power generation modules are determined to have a state of charge greater than the second charge threshold, while the state of charge of the remaining Q second power generation modules is not greater than the second charge threshold.

[0251] Control the above Q second power generation modules to enter the second energy-saving state, such as controlling the inverters and power modules of the battery pack inside these Q second power generation modules to have no switching action or these power modules to operate at a frequency lower than the switching frequency during normal operation, and the control units of these battery packs to maintain power supply.

[0252] Control the above N second power generation modules to maintain normal operation.

[0253] Then, based on the load power and load capacity of each of the N second power generation modules, M second power generation modules are selected from these N power generation modules to control these M second power generation modules (i.e., the fourth target power generation module) to continue to maintain normal operation, while ensuring that the sum of the load capacity of these M second power generation modules and the load power of the first power generation module is not less than the load power so that it can support the current load.

[0254] Control the other (NM) second power generation modules (i.e., the third target power generation module) to enter the second energy-saving state, such as controlling the inverters and power modules of the battery packs inside the (NM) second power generation modules to have no switching action or these power modules to operate at a frequency lower than the switching frequency during normal operation, and the control units of these battery packs to maintain power supply.

[0255] Where Q, M and N are all integers, Q≥0, N≥1, M≥1 and N≥M.

[0256] When only one second power generation module remains in normal working condition in the power generation system, each battery pack inside the second power generation module in normal working condition is used as a control unit. The state of charge of each battery pack inside is determined to be greater than the second state of charge threshold. J battery packs are determined to have a state of charge greater than the second state of charge threshold, and the state of charge of the remaining O battery packs is not greater than the second state of charge threshold.

[0257] Control the above 0 battery packs to enter the second energy-saving state, such as the power modules controlling these 0 battery packs not switching or these power modules operating at a lower frequency than the normal switching frequency, and the control units of these battery packs maintaining power supply.

[0258] Control the above J battery packs to maintain normal operating conditions.

[0259] Then, based on the load power and load capacity of each of the J battery packs, K battery packs are selected from the J battery packs to control these K battery packs (i.e., the second target power generation module) to continue to maintain normal operation, while ensuring that the sum of the load capacity of these K battery packs and the load power of the first power generation module is not less than the load power so that it can support the current load.

[0260] Control the other (JK) battery packs to enter the second energy-saving state, such as controlling the power modules of these battery packs to have no switching action or these power modules to operate at a frequency lower than the switching frequency during normal operation, and the control units of these battery packs to maintain power supply; where O, J and K are all integers, O≥0, J≥1, K≥1 and J≥K.

[0261] According to the control method of the power generation system provided in the embodiments of this application, by adopting the multi-level control principle of first controlling the whole and then controlling the individual components, the corresponding components are controlled to enter the second energy-saving state step by step. On the basis of meeting the load demand, it can enable more power generation modules and / or battery packs to enter the energy-saving state as much as possible, further reducing ineffective consumption, reducing electricity costs, and having high processing efficiency.

[0262] The following explains the accumulation method of the power generation module.

[0263] In some embodiments, the load power of the second power generation module is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module. This may include:

[0264] Obtain the load power corresponding to each second power generation module and the state of charge of each second power generation module;

[0265] Based on the order of state of charge, the load power of the second power generation module corresponding to the state of charge is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module.

[0266] In this embodiment, the load power corresponding to each second power generation module in the power generation system and the state of charge of each second power generation module can be obtained first.

[0267] Based on the magnitude of the state of charge, the second power generation modules are sorted in descending order. The load power of the second power generation modules is accumulated sequentially from front to back. After each accumulation of load power, the sum of the current accumulated value and the load power of the first power generation module is compared with the load power. This process continues until the sum is not less than the load power. If all the second power generation modules corresponding to the current accumulated value are considered to be able to meet the load demand together with the first power generation module, then all the second power generation modules corresponding to the current accumulated value are determined as the fourth target power generation module, so as to control the fourth target power generation module to maintain normal operation.

[0268] In some embodiments, the load power of the second power generation module is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module. This may include:

[0269] Obtain the load power corresponding to each power generation module;

[0270] Based on the order of load power, the load power is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module.

[0271] In this embodiment, the load power corresponding to each second power generation module in the power generation system can be obtained first.

[0272] Then, based on the magnitude of the load power, the second power generation modules are sorted in descending order. The load power of the second power generation modules is accumulated sequentially from front to back. For each accumulated load power, the sum of the load power of the first power generation modules is compared with the load power until the sum is not less than the load power. If all the second power generation modules corresponding to the current accumulated value can meet the load demand together with the first power generation modules, then all the second power generation modules corresponding to the current accumulated value are determined as the fourth target power generation modules, so as to control the fourth target power generation modules to maintain normal operation.

[0273] According to the control method of the power generation system provided in the embodiments of this application, the load power is accumulated by using the magnitude of the load power or the level of charge. All second power generation modules whose accumulated value is not less than the load power are identified as the fourth target power generation modules. The fourth target power generation modules are controlled to maintain normal operation and supply power. On the basis of meeting the load demand, as many power generation modules as possible can be controlled to enter the energy-saving state, further reducing ineffective losses, reducing electricity costs, and thus improving the user experience.

[0274] In some embodiments, the load power of the second power generation module is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module. This may include:

[0275] Based on the identification order of each second power generation module, the load power of each identified second power generation module is accumulated sequentially until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then identified as the fourth target power generation module.

[0276] In this embodiment, the identification order is the order in which the second power generation module is identified.

[0277] Based on the identification order, the load power corresponding to each identified second power generation module is obtained. The load power corresponding to the newly identified second power generation module is accumulated with the load power corresponding to the previously identified second power generation modules. The accumulated value is compared with the sum of the load power of the first power generation module and the load power. If the sum is less than the load power, it is considered that all the second power generation modules corresponding to the current accumulated value combined with the first power generation module cannot meet the load demand. Then, other second power generation modules are identified and the accumulation process is repeated until the sum of the new accumulated value and the load power of the first power generation module is not less than the load power. It is considered that all the power generation modules corresponding to the current accumulated value combined with the first power generation module can meet the load demand. Then, all the second power generation modules corresponding to the current accumulated value are determined as the fourth target power generation module to control the fourth target power generation module to maintain normal operation.

[0278] The control method for the power generation system provided in the embodiments of this application has high flexibility by providing multiple accumulation methods to determine the power generation modules that need to be controlled to maintain normal operation.

[0279] The following explains the method for accumulating battery packs.

[0280] In some embodiments, the load power of the battery pack is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is then determined as the second target battery pack. This may include:

[0281] Obtain the load power and state of charge of each battery pack;

[0282] Based on the order of state of charge, the load power of the battery packs corresponding to the state of charge is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is then determined as the second target battery pack.

[0283] In this embodiment, the load power and state of charge of each battery pack can be obtained first.

[0284] Based on the state of charge, each battery pack is sorted in descending order. The load power of each battery pack is accumulated sequentially from front to back. After each accumulated load power, the sum of the current accumulated value and the load power of the first power generation module is compared with the load power. This process continues until the sum is not less than the load power. If the current accumulated value corresponds to all battery packs that can meet the load requirements, then all battery packs corresponding to the current accumulated value are identified as the second target battery packs to control the second target battery packs to maintain normal operation.

[0285] In some embodiments, the load power of the battery pack is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power, and the battery pack corresponding to the accumulated value is determined as the second target battery pack. This may include:

[0286] Obtain the load power corresponding to each battery pack;

[0287] Based on the order of load power, the load power is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is then determined as the second target battery pack.

[0288] In this embodiment, the load power corresponding to each battery pack can be obtained first.

[0289] Then, the battery packs are sorted in descending order based on their load power. The load power of each battery pack is accumulated sequentially from front to back. For each accumulated load power, the sum of the current accumulated value and the load power of the first power generation module is compared with the load power. This process continues until the sum of the current accumulated value and the load power of the first power generation module is not less than the load power. If all battery packs corresponding to the current accumulated value are considered to meet the load requirements, then all battery packs corresponding to the current accumulated value are identified as the second target battery packs, and the second target battery packs are kept in normal working condition.

[0290] Of course, in other embodiments, the accumulation can also be performed by recognizing the order, which will not be elaborated here.

[0291] According to the control method of the power generation system provided in the embodiments of this application, the load power is accumulated by using the magnitude of the load power or the level of charge. All battery packs whose accumulated value is not less than the load power are identified as the second target battery packs. The second target battery packs are controlled to maintain normal operation and supply power. On the basis of meeting the load demand, as many battery packs as possible can be controlled to enter the energy-saving state, further reducing ineffective losses, reducing electricity costs, and thus improving the user experience.

[0292] It is understandable that after controlling the second power generation module and / or battery pack to enter the corresponding energy-saving state, it can also be controlled to exit the energy-saving state and enter the normal working state according to certain control logic.

[0293] For example, in some embodiments, the system can directly enter normal working state after a restart.

[0294] Alternatively, the corresponding components can be controlled to exit the energy-saving state based on changes in the first operating parameters of the photovoltaic system, changes in the load power of the power generation system, and other factors.

[0295] The control logic for exiting the energy-saving state will be explained from several different perspectives below.

[0296] Firstly, control based on changes in the inverter's output electrical signal.

[0297] In some embodiments, step 120 may include:

[0298] In the event that at least one of the control power generation module and battery pack is not in normal operating condition, a target comparison value is determined based on the frequency and amplitude of the inverter's output voltage.

[0299] If the target comparison value is within a preset abnormal range, control at least one of the power generation modules that are not in normal working state, and / or at least one of the battery packs, to enter normal working state.

[0300] In this embodiment, not being in normal working state may include being in a second energy-saving state.

[0301] The target comparison value can be the output value of a certain characteristic function with the frequency and amplitude of the inverter's output voltage as independent variables.

[0302] The feature function can be user-defined or set based on historical data.

[0303] The preset anomaly interval is the range used to characterize anomalies in the target comparison value. The preset anomaly interval can be user-defined.

[0304] It is understandable that when the target comparison value is not within the preset abnormal range, the target comparison value can be approximately considered to be normal.

[0305] When the target comparison value is within the preset abnormal range (including the upper and lower thresholds of the range), the target comparison value is considered abnormal, and thus the inverter's output electrical signal is approximately considered abnormal.

[0306] If an abnormality is detected in the inverter's output electrical signal, one or more of the components that have entered the energy-saving state can be immediately controlled to exit the energy-saving state and enter the normal working state. This ensures that the sum of the load power of all the power generation modules that have entered the normal working state is not less than the load power, so that the system can output stable AC power with a faster response speed and ensure the continuity of power supply.

[0307] The following explanation uses a power generation system consisting of a power generation modules as an example, where a is a positive integer.

[0308] For example, in a scenario where there is a backup power requirement for grid connection and the system is in a discharging state, if the first total charge value of the energy storage system is not greater than the second charge threshold, after controlling b second power generation modules to enter the second energy-saving state, if an abnormality is subsequently detected in the output electrical signal of the inverter, then control one or more of the above b second power generation modules to exit the second energy-saving state and enter the normal working state; where b≥0 and b is an integer.

[0309] For example, in a scenario where there is a backup power requirement for grid connection and the system is in a charging state, after controlling c second power generation modules to enter the second energy-saving state, if an abnormality is subsequently detected in the output electrical signal of the inverter, then one or more of the above c second power generation modules will be controlled to exit the second energy-saving state and enter the normal working state; where c≥0 and c is an integer.

[0310] For example, in an off-grid scenario, after controlling d second power generation modules to enter the second energy-saving state and / or controlling e battery packs to enter the second energy-saving state, if an abnormality is subsequently detected in the inverter's output electrical signal, then control one or more of the aforementioned d second power generation modules and / or one or more of the e battery packs to exit the second energy-saving state and enter the normal operating state; where d≥0, e≥0, and d and e are both integers.

[0311] It should be noted that in actual operation, when the load suddenly increases, the load-carrying capacity of the normally operating power generation module is insufficient to support the sudden increase in load power, and the inverter output voltage will exhibit abnormal characteristics. The system uses the output of a certain characteristic function with the amplitude and frequency of the inverter output voltage as independent variables as the judgment basis. When the function output is identified to be in an abnormal range, the relevant energy unit is controlled to quickly output power and exit the loss reduction state to ensure the continuity of power supply to the load. This can control the excess energy unit to enter the loss reduction state when the load is stable, and can also ensure the continuity of backup power when the load suddenly increases in the off-grid energy-saving state.

[0312] According to the control method of the power generation system provided in the embodiments of this application, the components in the power generation system are controlled to exit the energy-saving state according to the changes in the output electrical signal of the inverter. This enables the system to output stable AC power with a faster response speed, ensures the continuity of off-grid backup power, and effectively ensures the normal and stable operation of the power generation system.

[0313] Secondly, control based on changes in the load power corresponding to the power generation system.

[0314] In some embodiments, step 120 may include:

[0315] In the discharge state and after at least one of the power generation modules is not in normal working state, if the sum of the load power corresponding to the power generation modules in normal working state is less than the load power corresponding to the power generation system, at least some of the power generation modules that are not in normal working state are controlled to enter normal working state, so that the sum of the load power corresponding to the power generation modules in normal working state is not less than the load power.

[0316] In this embodiment, not being in normal working state may include being in a first energy-saving state or a second energy-saving state.

[0317] The following explanation will continue using the example of a power generation system consisting of a second power generation module.

[0318] For example, in a scenario where there is no backup power requirement and the system is in a discharging state, if the first total charge value of the energy storage system is greater than the second charge threshold, after controlling f second power generation modules to enter the first energy-saving state, if the load power corresponding to the subsequent power generation system increases and exceeds the sum of the load power corresponding to (af) second power generation modules and the sum of the load power corresponding to all first power generation modules, then a sufficient number of second power generation modules need to be activated from the f second power generation modules to support the current load power, ensuring that the total load capacity corresponding to all normally functioning power generation modules is sufficient to support the current load power. The specific accumulation method has been explained in the above embodiment and will not be repeated here; where f is a positive integer and f≤a.

[0319] For example, in a scenario where there is a backup power demand for grid connection and the system is in a discharging state, if the first total charge value of the energy storage system is greater than the second charge threshold, after controlling g second power generation modules to enter the second energy-saving state, if the load power corresponding to the subsequent power generation system increases and exceeds the sum of the load power corresponding to (ag) power generation modules and the sum of the load power corresponding to all first power generation modules, then a sufficient number of second power generation modules need to be activated from the g second power generation modules to support the current load power, ensuring that the total load capacity corresponding to all normally operating power generation modules is sufficient to support the current load power; where g is a positive integer and g≤a.

[0320] According to the control method of the power generation system provided in the embodiments of this application, the components in the power generation system are controlled to exit the energy-saving state according to the change of the load power corresponding to the power generation system. It can flexibly adjust based on the changes in actual electricity demand, meet the electricity demand while saving energy and reducing losses, ensure the stable operation of the power generation system, and improve the user experience.

[0321] Third, control based on changes in the first operating parameter of the photovoltaic system.

[0322] In some embodiments, step 120 may include:

[0323] In a non-pure energy storage type power generation module, if the first operating parameter of the photovoltaic system is greater than a first threshold and the power generation module with the first operating parameter greater than the first threshold is not in normal working condition, the power generation module with the first operating parameter greater than the first threshold is controlled to enter normal working condition, and / or at least one of the battery packs included in the power generation module with the first operating parameter greater than the first threshold is controlled to enter normal working condition.

[0324] In this embodiment, not being in normal working state may include being in a first energy-saving state or a second energy-saving state.

[0325] Regardless of whether it's a grid-connected scenario with no backup power requirement, a grid-connected scenario with backup power requirement, or an off-grid scenario; regardless of the charging / discharging state; whether it's controlling the energy storage system to enter the first energy-saving state or the second energy-saving state, or controlling the battery pack to enter the second energy-saving state, in any scenario, after implementing a loss reduction strategy and controlling the second power generation module to enter the first energy-saving state or the second energy-saving state, or controlling the battery pack to enter the second energy-saving state, if during subsequent operation, it is detected that the first operating parameter of the photovoltaic system included in the second power generation system is greater than the first threshold, then the second power generation module and / or the battery pack in the second power generation module can be controlled to exit the energy-saving state.

[0326] According to the control method of the power generation system provided in the embodiments of this application, the working state of the components in the power generation system is controlled according to the change of the first working parameter of the photovoltaic system. When one or more photovoltaic systems are generating power normally, at least one of the power generation modules that are not in normal working state and / or at least one of the battery packs are controlled to enter normal working state, which can reduce curtailment and improve the utilization rate of solar energy.

[0327] The power generation system control method provided in this application can be executed by a power generation system control device. This application uses the example of a power generation system control device executing the power generation system control method to illustrate the power generation system control device provided in this application.

[0328] This application also provides a control device for a power generation system.

[0329] The power generation system includes at least one power generation module, each power generation module includes a photovoltaic system, an energy storage system and an inverter connected to the energy storage system, and each energy storage system includes at least one battery pack.

[0330] As shown in Figure 4, the control device of the power generation system includes: a first processing module 410 and a second processing module 420.

[0331] The first processing module 410 is used to obtain the category of the power generation module, the working scenario of the power generation system, and the backup power requirement of the power generation system; the working scenario includes off-grid scenario or grid-connected scenario; the category includes pure storage category or non-pure storage category, and the power generation system of non-pure storage category also includes photovoltaic system;

[0332] The second processing module 420 is used to control at least one of the working states of each power generation module and each battery pack based on category, working scenario and backup power requirements; the working states include: first energy-saving state, second energy-saving state or normal working state.

[0333] According to the control device of the power generation system provided in the embodiments of this application, by combining the off-grid and grid-connected scenarios and whether there is a backup power requirement, the working state of the power generation module and the battery pack is adjusted. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as the power generation module being in a long-term meaningless standby, the system equipment loss accounting for a large ratio of battery discharge power, or the majority of the energy output by the battery being used for its own equipment standby loss, thereby saving energy consumption, significantly reducing electricity costs, and improving user experience.

[0334] In some embodiments, the second processing module 420 may also be used for:

[0335] Obtain the first operating parameters of the photovoltaic system in a non-pure energy storage type power generation module;

[0336] The non-pure storage type power generation module with the first working parameter greater than the first threshold is identified as the first power generation module, and the remaining power generation modules other than the first power generation module are identified as the second power generation module.

[0337] Based on the working scenario and backup power requirements, control at least one of the working states of the second power generation module and the working states of each battery pack in the second power generation module.

[0338] In some embodiments, the second processing module 420 may also be used for:

[0339] Based on the working scenario and backup power requirements, control at least one of the following: the operating state of the second power generation module and the operating state of each battery pack in the second power generation module.

[0340] In grid-connected scenarios, the working status of each second power generation module and / or each battery pack is controlled based on backup power demand and the charging and discharging status of the energy storage system.

[0341] In off-grid scenarios, the operating status of each second power generation module and / or each battery pack is controlled based on the load power of the power generation system.

[0342] In some embodiments, the second processing module 420 may also be used for:

[0343] Based on the charging and discharging state, obtain the target judgment conditions;

[0344] Based on the target judgment conditions, charging and discharging status and backup power requirements, control the working status of each second power generation module and / or each battery pack.

[0345] In some embodiments, the second processing module 420 may also be used for:

[0346] When there is no need for backup power and the target judgment conditions are met, control each second power generation module to enter the first energy-saving state;

[0347] When there is no backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the discharging state, control at least some of the second power generation modules to enter the first energy-saving state.

[0348] When there is no backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the charging state, control each second power generation module to maintain normal operation.

[0349] In some embodiments, the second processing module 420 may also be used for:

[0350] Based on the load power corresponding to the power generation system, a first target power generation module is determined from all the second power generation modules; the sum of the load power of the first target power generation module and the load power of the first power generation module is not less than the load power.

[0351] The first target power generation module is controlled to enter the normal working state, and the remaining second power generation modules other than the first target power generation module are controlled to enter the first energy-saving state.

[0352] In some embodiments, the second processing module 420 may also be used for:

[0353] When there is a backup power requirement and the target judgment conditions are met, control each second power generation module to enter the second energy-saving state;

[0354] When there is a backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the discharging state, control at least some of the second power generation modules to enter the second energy-saving state.

[0355] When there is a backup power requirement, the target judgment conditions are not met, and the charging / discharging state is the charging state, control each second power generation module to maintain normal operation.

[0356] In some embodiments, the second processing module 420 may also be used for:

[0357] Based on the load power corresponding to the power generation system, a second target power generation module is determined from all the second power generation modules; the sum of the load power of the second target power generation module and the load power of the first power generation module is not less than the load power.

[0358] Control the second target power generation module to enter the normal working state, and control the remaining second power generation modules (excluding the second target power generation module) to enter the second energy-saving state.

[0359] In some embodiments, the second processing module 420 may also be used for:

[0360] The first total charge value is obtained by weighted summation of the states of charge of each energy storage system.

[0361] When the charging / discharging state is the charging state, the target judgment condition is determined to be that the first total charge value is not less than the first charge threshold.

[0362] When the charging / discharging state is in the discharging state, the target judgment condition is determined to be that the first total charge value is not greater than the second charge threshold, and / or the load power corresponding to the power generation system is not greater than the second threshold.

[0363] In some embodiments, the second processing module 420 may also be used for:

[0364] Based on the load power corresponding to the power generation system, the third target power generation module in each second power generation module is controlled to enter the second energy-saving state.

[0365] In some embodiments, the second processing module 420 may also be used for:

[0366] The load power of the second power generation module is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is determined as the fourth target power generation module, and the remaining second power generation modules other than the fourth target power generation module are determined as the third target power generation module.

[0367] Control the fourth target power generation module to maintain normal operation, and control the third target power generation module to enter the second energy-saving state.

[0368] In some embodiments, the second processing module 420 may also be used for:

[0369] Obtain the load power corresponding to each second power generation module and the state of charge of each second power generation module;

[0370] Based on the order of state of charge, the load power of the second power generation module corresponding to the state of charge is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module.

[0371] In some embodiments, the second processing module 420 may also be used for:

[0372] Obtain the load power corresponding to each power generation module;

[0373] Based on the order of load power, the load power is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module.

[0374] In some embodiments, the second processing module 420 may also be used for:

[0375] Based on the load power corresponding to each battery pack in the second power generation module that is in normal working condition, the working state of each battery pack in the second power generation module is controlled.

[0376] In some embodiments, the second processing module 420 may also be used for:

[0377] The first target battery pack in the control battery pack is put into the second energy-saving state, and the second target battery pack in the control battery pack other than the first target battery pack is kept in the normal working state.

[0378] In some embodiments, the second processing module 420 may also be used for:

[0379] The load power of the battery pack is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is determined as the second target battery pack, and the remaining battery packs in the battery pack other than the second target battery pack are determined as the first target battery pack.

[0380] The system controls the second target battery pack to maintain normal operation and controls the first target battery pack to enter a second energy-saving state; the number of second target battery packs is at least one.

[0381] In some embodiments, the second processing module 420 may also be used for:

[0382] Obtain the load power and state of charge of each battery pack;

[0383] Based on the order of state of charge, the load power of the battery packs corresponding to the state of charge is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is then determined as the second target battery pack.

[0384] In some embodiments, the second processing module 420 may also be used for:

[0385] Obtain the load power corresponding to each battery pack;

[0386] Based on the order of load power, the load power is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is then determined as the second target battery pack.

[0387] In some embodiments, the second processing module 420 may also be used for:

[0388] Obtain the state of charge of each second power generation module;

[0389] The second power generation module whose state of charge is not greater than the second charge threshold enters the second energy-saving state, and the second power generation module whose state of charge is greater than the second charge threshold enters the normal operation state.

[0390] Based on the load power corresponding to the power generation system, the third target power generation module in the second power generation module whose state of charge is greater than the second state of charge threshold is controlled to enter the second energy-saving state.

[0391] When the number of second power generation modules in normal operation is 1, the operating status of each battery pack in the second power generation module in normal operation is controlled based on the standby power of each battery pack in the second power generation module in normal operation.

[0392] In some embodiments, the second processing module 420 may also be used for:

[0393] In the discharge state and after at least one of the power generation modules is not in normal working state, if the sum of the load power corresponding to the power generation modules in normal working state is less than the load power corresponding to the power generation system, at least some of the power generation modules that are not in normal working state are controlled to enter normal working state, so that the sum of the load power corresponding to the power generation modules in normal working state is not less than the load power.

[0394] In some embodiments, the second processing module 420 may also be used for:

[0395] In the event that at least one of the control power generation module and battery pack is not in normal operating condition, a target comparison value is determined based on the frequency and amplitude of the inverter's output voltage.

[0396] If the target comparison value is within a preset abnormal range, control at least one of the power generation modules that are not in normal working state, and / or at least one of the battery packs, to enter normal working state.

[0397] In some embodiments, the second processing module 420 may also be used for:

[0398] In a non-pure energy storage type power generation module, if the first operating parameter of the photovoltaic system is greater than a first threshold and the power generation module with the first operating parameter greater than the first threshold is not in normal working condition, the power generation module with the first operating parameter greater than the first threshold is controlled to enter normal working condition, and / or at least one of the battery packs included in the power generation module with the first operating parameter greater than the first threshold is controlled to enter normal working condition.

[0399] In some embodiments, the second processing module 420 may also be used for:

[0400] The inverter corresponding to the energy storage system that has entered the first energy-saving state is shut down, and / or the battery pack included in the energy storage system is shut down.

[0401] In some embodiments, the second processing module 420 may also be used for:

[0402] The system controls the power modules within the generator module and / or battery pack to enter the second energy-saving state, either by blocking out the waveform or by operating at a target frequency lower than the normal operating frequency, and controls the battery pack included in the energy storage system to maintain power supply.

[0403] The control device for the power generation system in this application embodiment can be an electronic device or a component within an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television set (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the scope of the device.

[0404] The control device for the power generation system in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit the specific operating system used.

[0405] The control device for the power generation system provided in this application can realize the various processes implemented in the method embodiments of Figures 1 to 3. To avoid repetition, it will not be described again here.

[0406] This application also provides a power generation system.

[0407] As shown in Figure 5, the power generation system includes at least one power generation module and a control device for the power generation system as described in any of the above embodiments.

[0408] Each power generation module includes an energy storage system and an inverter connected to the energy storage system.

[0409] Each energy storage system includes at least one battery pack.

[0410] In some embodiments, the power generation module may also include a photovoltaic system.

[0411] The photovoltaic system is connected to the inverter.

[0412] In grid-connected scenarios, the inverter is also connected to the power grid.

[0413] The control device of the power generation system is electrically connected to the power generation module and is used to execute the control method of the power generation system as described in any of the above embodiments.

[0414] In some embodiments, the control device of the power generation system may include an intelligent standby identification module as shown in FIG5, which is communicatively connected to the inverter and the electricity meter respectively.

[0415] Figure 11 illustrates a schematic diagram of an inverter structure.

[0416] As shown in Figure 11, the inverter may include a control unit, a drive circuit, a power module, and a power circuit connected in sequence, wherein the power circuit is connected to the photovoltaic system and the power grid respectively.

[0417] Figure 12 illustrates a schematic diagram of a battery pack structure.

[0418] As shown in Figure 12, the battery pack may include: a control unit, a drive circuit, a power module, a power circuit, and battery cells connected in sequence, wherein the battery cells are communicatively connected to the control unit.

[0419] According to the power generation system provided in this application embodiment, by combining off-grid and grid-connected scenarios and whether or not there is a backup power requirement, the working state of the power generation module and the battery pack can be adjusted. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as the power generation module being in a long-term meaningless standby, the system equipment loss accounting for a large ratio of battery discharge power, or the majority of the energy output by the battery being used for its own equipment standby loss. This saves energy consumption, significantly reduces electricity costs, and thus improves the user experience.

[0420] In some embodiments, the power generation system may be an integrated photovoltaic-storage unit or a split-type photovoltaic-storage unit.

[0421] The specific structure of the power generation module will be explained below with reference to Figures 5 to 10.

[0422] Figure 5 illustrates a schematic diagram of a power generation system composed of an integrated power generation module without DC load, wherein the load includes an AC load connected between the power grid and the power generation module (i.e., the load shown in Figure 5), and the inverter and energy storage system are integrated.

[0423] The total inverter power is the sum of the load power and the grid power.

[0424] Figure 6 illustrates a schematic diagram of a power generation system consisting of an integrated DC load power generation module, wherein the load includes a DC load and an AC load, and the inverter, DC load and energy storage system are integrated into one unit.

[0425] Figure 7 illustrates a schematic diagram of a power generation system composed of a split-type power generation module without DC load. The load includes an AC load connected between the power grid and the power generation module, and the inverter and the energy storage system are set separately. The inverter and the energy storage system are connected by a DC cable.

[0426] Figure 8 illustrates a schematic diagram of a power generation system consisting of a DC load split-type power generation module, wherein the load includes: a DC load and an AC load; the DC load is integrated with the energy storage system and is separated from the inverter.

[0427] Figure 9 illustrates a schematic diagram of another power generation system consisting of a DC load split-type power generation module, wherein the load includes: DC load and AC load; the DC load is integrated with the inverter and separated from the energy storage system.

[0428] Figure 10 illustrates a structural schematic diagram of another power generation system composed of DC load split-type power generation modules, wherein the load includes: DC load and AC load; the DC load, the integrated inverter and the energy storage system are set up separately.

[0429] A photovoltaic (PV) energy storage system typically refers to a solar photovoltaic (PV) power generation and storage system, which mainly consists of two parts: PV modules and battery packs. PV modules use solar cells to directly convert solar radiation energy into electrical energy, while the battery packs are responsible for storing this electrical energy so that it can be used when sunlight is not needed.

[0430] When sunlight is weak or absent, photovoltaic (PV) modules may fail to generate electricity or generate insufficient power, leading to two main scenarios: insufficient remaining battery charge or low load power. When the battery charge is insufficient, the battery pack neither charges nor discharges (or charges and discharges at low power), and the PV modules do not generate electricity. This renders the operation of some components meaningless, wasting system resources and increasing electricity costs for customers. When the load power is low, the power loss required for some components to operate is a significant proportion of the battery discharge power, resulting in substantial energy waste within the battery pack and poor energy efficiency. In countries like Europe with long rainy and snowy seasons, these scenarios will occur more frequently. Therefore, a reasonable strategy needs to be designed to reduce the waste of PV-storage system resources and improve the energy efficiency for users.

[0431] When a photovoltaic (PV) and energy storage (ESS) system operates at night, the PV modules in the PV storage unit may not generate electricity or generate insufficient power, leading to two power supply scenarios: ① The battery pack discharges to its State of Charge (SOC) of 0, at which point it can no longer supply power to the load, and the grid typically supplies power to the load; ② The load power is low, and the battery pack supplies power to the load, resulting in very low battery discharge power. In scenario ①, the battery pack neither charges nor discharges (or charges and discharges at low power), and the PV modules do not generate electricity. The operation of the PV storage unit is meaningless, wasting system resources and increasing the customer's electricity costs. In scenario ②, the power loss required for the PV storage unit to operate is a large proportion of the battery discharge power, resulting in significant energy waste within the battery pack and poor energy efficiency.

[0432] To address at least one of the aforementioned technical problems, embodiments of this application provide a control method, apparatus, storage medium, and optical storage system for an optical storage system.

[0433] Please refer to Figures 13 and 14. Figure 13 is a flowchart illustrating the control method of the photovoltaic-storage system provided in an embodiment of this application, and Figure 14 is a structural schematic diagram of the photovoltaic-storage system provided in an embodiment of this 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 supply power to the load. Each photovoltaic-storage unit includes an inverter, at least one battery pack connected to the inverter, and photovoltaic modules 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, it implements the control method of any of the photovoltaic-storage systems provided in the embodiments of this application.

[0434] The execution subject of the control method for the optical storage system can be an electronic device or a functional module or entity (such as a processor) within an electronic device capable of implementing the control method. The electronic devices mentioned in this application embodiment include, but are not limited to, tablet computers, desktop computers, and mobile devices (such as mobile phones, personal digital assistants, and dedicated messaging devices). The control method for the optical storage system provided in this application embodiment is described below using an electronic device as the execution subject as an example. The control method for the optical storage system includes the following steps 101-103, wherein:

[0435] 101. When the photovoltaic and energy storage system is in grid-connected operation and normal operating mode, obtain the photovoltaic power supply voltage of the photovoltaic modules, the remaining total capacity of all battery packs, and the load power of the load;

[0436] 102. Determine whether the photovoltaic power supply voltage, remaining total power, and load power are sufficient to implement a low-power control strategy for the photovoltaic energy storage system. If yes, proceed to step 103 below. If no, return to step 101.

[0437] 103. Implement a low-power control strategy for the photovoltaic storage unit to control the photovoltaic storage system to enter a low-power operating mode.

[0438] In other words, this application embodiment obtains the photovoltaic power supply voltage, remaining total power, and load power in real time when the photovoltaic power supply voltage, remaining total power, and load power are in grid-connected operation and normal working mode. Based on the photovoltaic power supply voltage, remaining total power, and load power, it analyzes and determines whether the photovoltaic power storage system needs to implement a low-power control strategy. If so, it implements a low-power control strategy for the photovoltaic power storage unit, thereby avoiding meaningless operation of the photovoltaic power storage unit or a large proportion of operating power loss, minimizing the waste of system resources, improving electricity economy, and providing high flexibility.

[0439] The following will take a photovoltaic energy storage system with multiple operating states, such as off-grid operation and grid-connected operation, as an example to provide a detailed explanation of steps 101-103 above.

[0440] 101. When the photovoltaic and energy storage system is in grid-connected operation and normal operating mode, obtain the photovoltaic power supply voltage of the photovoltaic modules, the remaining total power of all battery packs, and the load power of the load.

[0441] When operating in grid-connected and normal mode, the system can periodically (e.g., every five minutes) acquire photovoltaic power supply voltage, remaining total power, and load power over a specified period for analysis and judgment, thereby improving the reliability of the analysis results. The photovoltaic-storage system includes at least three operating states: grid-connected operation, off-grid enabled operation, and off-grid operation. Grid-connected operation refers to the operation state when the grid is connected to the photovoltaic-storage system as a power source; off-grid operation refers to the operation state when the grid is not connected to the photovoltaic-storage system; and off-grid enabled operation refers to the operation state when the photovoltaic-storage system is about to transition from grid-connected to off-grid operation. The photovoltaic-storage system can include two operating modes: normal operating mode and low-power operating mode. In low-power operating mode, some devices in the photovoltaic-storage system are in a shutdown or dormant state, significantly reducing system power consumption.

[0442] Specifically, please refer to Figures 14 and 15 above. Figure 15 is a schematic diagram of the control method for the photovoltaic-storage system provided in this application embodiment. The photovoltaic-storage system includes M photovoltaic-storage units. In addition to battery packs, inverters, and photovoltaic modules (PCS), each photovoltaic-storage unit also includes other components to maintain its operation. Each photovoltaic-storage unit contains N battery packs, and the inverters and battery packs can be integrated into a single package. The number of inverters in the system is the same as the number of photovoltaic-storage units, M≥1, N≥1. Photovoltaic modules are components that convert solar radiation energy into electrical energy, which can be transmitted to the battery packs or loads via inverters. The photovoltaic supply voltage (PV) is the voltage output by the photovoltaic modules to the inverters, allowing the photovoltaic modules to supply power to the battery packs or loads via the inverters. The remaining total capacity is determined based on the SOC (State of Charge) of each battery pack in the photovoltaic-storage unit, reflecting the remaining capacity of the corresponding battery pack.

[0443] In some embodiments, the photovoltaic-storage system further includes a power acquisition unit located on the grid side, and the step of "acquiring the load power of the load" specifically includes:

[0444] The power input to the grid is obtained through a power acquisition device, and the output power of the inverter is also obtained.

[0445] The load power of the load is determined based on the output power of all inverters and the power of the grid feeder.

[0446] Referring to Figure 14, the power acquisition device can be a gateway or a meter. Both the power acquisition device and the inverter are connected to the processor. For example, the processor can be equipped with multiple interfaces to connect the power acquisition device and the inverter for communication. The grid power is collected by the power acquisition device and transmitted to the processor. The processor can first calculate the sum of the output power of all inverters to obtain the total inverter power, and then calculate the difference between the total inverter power and the grid power. The difference is the load power of the load.

[0447] 102. Determine whether the photovoltaic power supply voltage, the remaining total power, and the load power are sufficient to implement a low-power control strategy for the photovoltaic energy storage system; if so, proceed to step 103 below; if not, return to step 101.

[0448] The analysis of photovoltaic power supply voltage, remaining total power, and load power determines whether the photovoltaic-storage system is experiencing significant resource waste. Examples include prolonged periods of meaningless operation of photovoltaic and storage units or a large proportion of power loss during operation. If the analysis indicates significant resource waste, a low-power control strategy is deemed necessary to reduce overall system losses; otherwise, such a strategy is not required.

[0449] In some embodiments, please refer to Figure 16, which is another flowchart illustrating the control method of the photovoltaic energy storage system provided in this application embodiment. The step "determining whether the photovoltaic energy storage system needs to execute a low-power control strategy based on the photovoltaic supply voltage, the remaining total power, and the load power" may specifically include:

[0450] 1021. Determine whether the photovoltaic supply voltage of all photovoltaic modules is less than the preset supply voltage threshold and the remaining total power is less than or equal to the preset discharge cutoff power. If yes, determine that the photovoltaic-storage system needs to implement a low-power control strategy. If no, when the photovoltaic supply voltage of all photovoltaic modules is less than the preset supply voltage threshold and the remaining total power is greater than the preset discharge cutoff power, execute step 1022. When the photovoltaic supply voltage of any photovoltaic module is greater than or equal to the preset supply voltage threshold, re-execute step 101.

[0451] 1022. Determine whether the photovoltaic storage system needs to implement a low-power control strategy based on the load power.

[0452] The preset power supply voltage threshold is the minimum voltage at which the photovoltaic module can supply power normally. If the voltage is lower than this minimum, the photovoltaic module will not be able to supply power or the power supply will be abnormal. For example, if the photovoltaic module cannot receive sunlight at night or the sunlight intensity is too weak, the photovoltaic power supply voltage will be lower than this minimum voltage. The preset discharge cutoff capacity is the minimum capacity at which the battery pack can discharge normally. If the capacity is equal to or lower than this minimum, the battery pack will have insufficient reserve power and will not be able to discharge or will discharge abnormally.

[0453] In practice, the photovoltaic (PV) supply voltage can be compared and analyzed first. When the PV supply voltage of any PV module is greater than or equal to the preset supply voltage threshold, it indicates that the PV module can supply power normally, and the PV-storage system does not need to implement a low-power control strategy. When the PV supply voltage of all PV modules is less than the preset supply voltage threshold, it indicates that the PV modules cannot supply power normally, and the remaining total capacity of the battery pack needs to be further analyzed. If the remaining total capacity is less than or equal to the preset discharge cutoff capacity, the battery pack cannot supply power normally. In this case, power is usually drawn from the grid. At this time, the PV-storage unit cannot receive power from the outside through the PV modules, nor can it provide power to the load. Its operation is meaningless, and it can be determined that the PV-storage system needs to implement a low-power control strategy. When the remaining total capacity is greater than the discharge cutoff capacity, it indicates that the battery pack can discharge normally, and the load power needs to be further analyzed.

[0454] In some embodiments, step 1022 above may specifically include:

[0455] Determine whether the load power is less than a preset light load threshold;

[0456] When the load power is less than the preset light load threshold, it is determined that the optical storage system needs to implement a low power control strategy; when the load power is greater than or equal to the preset light load threshold, it is determined that the optical storage system does not need to implement a low power control strategy.

[0457] Specifically, a load power less than the preset light load threshold indicates that the power consumed by the load is very small, even less than the power loss required for the photovoltaic-storage unit to maintain its own operation. In this case, the power required for the photovoltaic-storage unit to operate is a large proportion of the battery pack's discharge power (a large proportion of power loss), resulting in significant energy waste in the battery pack and poor economic efficiency during power supply. It can be determined that the photovoltaic-storage system needs to implement a low-power control strategy. Conversely, if the load power is greater than or equal to the preset light load threshold, it indicates that the proportion of power consumed by the load is within the normal range, and it can be determined that the photovoltaic-storage system does not need to implement a low-power control strategy.

[0458] In some embodiments, in addition to considering the objective parameters mentioned above (i.e., the photovoltaic power supply voltage, remaining total power, and load power), user-defined requirements can also be considered when deciding whether to implement a low-power control strategy. For example, the photovoltaic-storage system can provide a low-power intelligent adjustment service that users can manually select. If the user chooses to activate the low-power intelligent adjustment service, the system can implement the low-power control strategy when the objective parameters determine that it is necessary to implement a low-power control strategy, thus achieving intelligent adjustment. If the user chooses not to activate 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 good dynamic response performance, the user can choose not to activate the low-power intelligent adjustment service. In this case, even if the above objective parameters meet the determination conditions, the low-power control strategy will not be implemented in the end. In actual operation, user requirements can be analyzed before analyzing the load power. That is, before performing step 1022 above, the control method of the photovoltaic-storage system may also include:

[0459] Detect whether the optical storage system has started the low-power intelligent adjustment service;

[0460] If it has been started, proceed to step 1022 above; if it has not been started, return to step 101 above.

[0461] 103. Execute the low-power control strategy on the optical storage unit to control the optical storage system to enter a low-power operating mode.

[0462] Among them, the low-power control strategy reduces system power consumption by controlling some components in the optical storage unit to enter a sleep or shutdown state, thereby enabling the system to enter a low-power operating mode.

[0463] In some embodiments, the components involved in the low-power control strategy include the inverter and battery pack in the photovoltaic-storage unit. In this case, please continue to refer to Figure 16, and step 103 above may specifically include:

[0464] Turn off the drives in all inverters and disconnect the relays in all inverters;

[0465] Turn off the drives in all battery packs and disconnect the relays in all battery packs.

[0466] When the system determines that a low-power control strategy needs to be implemented, it can send a sleep command to each photovoltaic and energy storage unit to shut down both the inverter and the battery pack. Specifically, the inverter will be shut down (mainly referring to turning off the drive of its power switching transistors) and all relays will be tripped. Similarly, each battery pack will be shut down (mainly referring to turning off the drive of its power switching transistors) and all relays will be tripped. After a period of time, the entire photovoltaic and energy storage unit will enter a sleep state, which will greatly reduce the power loss of the photovoltaic and energy storage unit itself and avoid the photovoltaic and energy storage unit from running meaninglessly for a long time, thus reducing the waste of system resources.

[0467] It should be noted that after the photovoltaic energy storage system enters the low-power operating mode, the dormant photovoltaic energy storage units can be woken up according to the real-time operation of the photovoltaic energy storage system, so that the photovoltaic energy storage system exits the low-power operating mode, realizing flexible switching between the low-power operating mode and the normal operating mode. That is, the control method of the photovoltaic energy storage system may also include:

[0468] Monitor the operating status of the photovoltaic energy storage system, the photovoltaic power supply voltage, the remaining total power, and the changes in the load power;

[0469] If any of the photovoltaic power supply voltage changes to a value greater than or equal to a preset power supply voltage threshold, or if the operating state changes to an off-grid operation enabled state or an off-grid operation state, then the photovoltaic energy storage system is controlled to enter the normal operating mode.

[0470] If the photovoltaic power supply voltage is less than the preset power supply voltage threshold and the operating status remains unchanged, the photovoltaic energy storage system is controlled to enter the normal operating mode based on the changes in the remaining total power and the load power.

[0471] Specifically, if a change in the photovoltaic (PV) supply voltage is detected, and this change is greater than or equal to a preset supply voltage threshold, it indicates that the PV modules can supply power normally. At this point, the PV-storage system can be controlled to transition from its current low-power operating mode to normal operating mode. Alternatively, if a change in the operating status of the PV-storage system is detected, specifically a change to off-grid enabled or off-grid operating mode, the low-power operating mode in off-grid operation prevents the dormant PV-storage units from being reawakened. In off-grid enabled mode, the system needs to maintain high on-grid / off-grid dynamic response performance. Therefore, both operating states require waking up the PV-storage units and controlling the PV-storage system to enter normal operating mode. If the PV-storage system remains in grid-connected operation (operating status unchanged) and the PV supply voltage remains unchanged or, after a change, is still less than the preset supply voltage threshold, further analysis of the remaining total power and the changes in the load power is necessary.

[0472] Furthermore, the above step of "controlling the photovoltaic energy storage system to enter the normal operating mode based on the changes in the remaining total power and the load power" may specifically include:

[0473] When the remaining total power changes to be greater than the preset discharge cutoff power, and the load power changes to be greater than or equal to the preset light load power threshold, the photovoltaic energy storage system is controlled to enter the normal operation mode.

[0474] When the remaining total power is greater than the preset discharge cutoff power, it indicates that the battery pack can supply power normally. At this time, in order to avoid the large proportion of the operating loss of the photovoltaic energy storage unit itself, which would cause a waste of system resources, the photovoltaic energy storage system will only be controlled to enter the normal operating mode from the current low power consumption mode when the load power change is greater than or equal to the preset light load power threshold. That is, the relay that was previously disconnected in the inverter will be activated, and the drive that was previously closed in the inverter will be turned on. At the same time, the relay that was previously disconnected in the battery pack will be activated first, and the drive that was previously closed in the battery pack will be turned on.

[0475] In addition, in other embodiments, the photovoltaic energy storage system can also have a backup power function. The backup power function refers to the ability of the photovoltaic energy storage system to continuously output stable AC power to the load in countries with unstable power supply, where the power grid may fail at any time, so as to ensure the normal operation of the load.

[0476] Please refer to Figures 13 and 14 above. The following will take a photovoltaic energy storage system with backup power function as an example to explain steps 101-103 in detail.

[0477] 101. When the photovoltaic and energy storage system is in grid-connected operation and normal operating mode, obtain the photovoltaic power supply voltage of the photovoltaic modules, the remaining total power of all battery packs, and the load power of the load.

[0478] When the photovoltaic-storage system is in grid-connected operation and normal working mode, the control method for the photovoltaic-storage system further includes: acquiring the backup power demand information and energy storage working mode of the photovoltaic-storage system. Specifically, please refer to Figures 17 and 18. Figure 17 is another flowchart illustrating the control method for the photovoltaic-storage system provided in this embodiment, and Figure 18 is another framework diagram illustrating the control method for the photovoltaic-storage system provided in this embodiment. Step 101 specifically involves: when the photovoltaic-storage system is in grid-connected operation and normal working mode, acquiring the photovoltaic supply voltage of the photovoltaic modules, the remaining total capacity of all battery packs, and the load power of the load, and acquiring the backup power demand information and energy storage working mode of the photovoltaic-storage system.

[0479] Specifically, the backup power demand information mainly indicates whether the photovoltaic-storage system needs backup power storage. This information can be manually entered by the user based on actual needs. For example, electronic devices may provide option buttons for backup power storage, such as "Backup Power Storage Required" and "Backup Power Storage Not Required." The user selects the "Backup Power Storage Required" button to generate backup power demand information indicating that the photovoltaic-storage system needs backup power storage, and selects the "Backup Power Storage Not Required" button to generate backup power demand information indicating that the photovoltaic-storage system does not need backup power storage. The energy storage operating mode refers to the operating mode of the energy storage components (battery pack) in the photovoltaic-storage system, which can generally include two types: discharge mode and charging mode.

[0480] 102. Determine whether the photovoltaic power supply voltage, the remaining total power, and the load power are sufficient to implement a low-power control strategy for the photovoltaic energy storage system; if so, proceed to step 103 below; if not, return to step 101.

[0481] When step 101 also requires obtaining backup power demand information and energy storage operating mode, please continue to refer to Figure 17. Step 102 may include: determining whether the photovoltaic-storage system needs to execute a low-power control strategy based on the backup power demand information, the energy storage operating mode, the photovoltaic power supply voltage, the remaining total power, and the load power.

[0482] In some embodiments, the low-power control strategy includes a first low-power control strategy and a second low-power control strategy. In this case, please refer to Figure 19, which is another flowchart illustrating the control method of the optical storage system provided in this application embodiment. Step 102 above may specifically include:

[0483] 1021. Determine whether the photovoltaic supply voltage of all photovoltaic modules is less than the preset supply voltage threshold; if yes, proceed to step 1022 below; if no, determine that the photovoltaic-storage system does not need to implement the low power consumption control strategy.

[0484] 1022. Determine whether the backup power demand information indicates that energy storage backup is required; if it indicates that energy storage backup is required, then proceed to step 1023 below; if it indicates that energy storage backup is not required, then proceed to step 1024 below.

[0485] 1023. Determine whether the photovoltaic-storage system needs to execute the first low-power control strategy based on the energy storage working mode, the remaining total power, and the load power;

[0486] 1024. Determine whether the photovoltaic-storage system needs to execute a second low-power control strategy based on the energy storage working mode, the remaining total power, and the load power.

[0487] The first low-power control strategy is applicable to scenarios requiring energy storage for backup power. It reduces losses without requiring the photovoltaic-energy storage unit to enter a dormant state, ensuring that the photovoltaic-energy storage system can continue to supply power to the load when the grid loses power. The second low-power control strategy is applicable to scenarios without requiring energy storage for backup power. It reduces losses by controlling the photovoltaic-energy storage unit to enter a dormant state, minimizing system resource waste.

[0488] In some embodiments, step 1023 above may specifically include:

[0489] Determine whether the energy storage operating mode is a charging mode;

[0490] If it is in charging mode, when the remaining total power is greater than or equal to the preset charging cutoff power, it is determined that the photovoltaic storage system needs to execute the first low power control strategy; otherwise, it is determined that the photovoltaic storage system does not need to execute the first low power control strategy.

[0491] If it is in discharge mode, when the remaining total power is less than or equal to the preset discharge cutoff power, or when the remaining total power is greater than the preset discharge cutoff power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic energy storage system needs to execute the first low power control strategy; otherwise, it is determined that the photovoltaic energy storage system does not need to execute the first low power control strategy.

[0492] That is, please continue to refer to Figure 18. In scenarios where energy storage is required for backup power, 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 cutoff power, it means that the battery pack power is sufficient. At this time, in order to avoid the system running at high energy consumption for a long time without any charging or discharging behavior after the battery is fully charged, which would cause resource waste, loss reduction can be performed on the premise that the photovoltaic energy storage unit does not enter the dormant state; otherwise, loss reduction will not be performed. ② If the battery pack is discharging (i.e., the energy storage working mode is discharge mode), then when the remaining total capacity is less than or equal to the preset discharge cutoff capacity, it means that the battery pack cannot discharge normally. In this case, to avoid the system running at high energy consumption for a long time without any charging or discharging behavior after the battery is completely discharged, resulting in resource waste, loss reduction can be performed without the photovoltaic energy storage unit entering a dormant state. When the remaining total capacity is greater than the preset discharge cutoff capacity and the load power is less than the preset light load power threshold, it means that although the battery pack can discharge normally, the power loss of the photovoltaic energy storage unit itself accounts for a large proportion. In this case, to reduce resource waste, loss reduction can be performed without the photovoltaic energy storage unit entering a dormant state; otherwise, loss reduction is not performed.

[0493] In some embodiments, step 1024 above may specifically include:

[0494] Determine whether the energy storage operating mode is a charging mode;

[0495] If it is in charging mode, when the remaining total power is greater than the preset charging cutoff power, it is determined that the photovoltaic energy storage system needs to execute the second low power control strategy.

[0496] If it is in discharge mode, when the remaining total power is less than or equal to the preset discharge cutoff power, or when the remaining total power is greater than the preset discharge cutoff power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic energy storage system needs to execute the second low power control strategy.

[0497] That is, please continue to refer to Figure 18. In scenarios where energy storage 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 cutoff power, it means that the battery pack power is sufficient. At this time, in order to avoid the system running at high energy consumption for a long time without any charging or discharging behavior after the battery is fully charged, thus causing resource waste, the photovoltaic energy storage unit can be controlled to enter a dormant state to reduce losses. Otherwise, no loss reduction will be performed. ④ If the battery pack is discharging (i.e., the energy storage working mode is discharge mode), when the remaining total capacity is less than or equal to the preset discharge cutoff capacity, it means that the battery pack cannot discharge normally. In this case, to avoid the system running at high energy consumption for a long time without any charging or discharging behavior after the battery is completely discharged, thus avoiding resource waste, the photovoltaic energy storage unit can be controlled to enter a dormant state to reduce losses. When the remaining total capacity is greater than the preset discharge cutoff capacity and the load power is less than the preset light load power threshold, it means that although the battery pack can discharge normally, the power loss of the photovoltaic energy storage unit itself is relatively large. In this case, to reduce resource waste, the photovoltaic energy storage unit can be controlled to enter a dormant state to reduce losses; otherwise, no loss reduction is performed.

[0498] 103. Execute the low-power control strategy on the optical storage unit to control the optical storage system to enter a low-power operating mode.

[0499] In some embodiments, when the low-power control strategy includes the first low-power control strategy and the second low-power control strategy described above, please continue to refer to Figures 18 and 19 above. Step 103 specifically includes:

[0500] 1031. When it is determined that the first low-power control strategy needs to be executed, shut down the drives in all inverters and disconnect the relays in all inverters;

[0501] 1032. When it is determined that the second low-power control strategy needs to be executed, turn off the drive in all inverters and disconnect the relays in all inverters; turn off the drive in all battery packs and disconnect the relays in all battery packs.

[0502] In other words, the execution methods in both the first and second low-power control strategies include at least: shutting down the inverters in the photovoltaic-storage unit (i.e., turning off the drives in all inverters and disconnecting the relays in all inverters). It should be noted that the first low-power control strategy is applicable to scenarios requiring energy storage for backup power, while the second low-power control strategy is applicable to scenarios without energy storage for backup power. In scenarios without energy storage for backup power, the photovoltaic-storage unit does not need to be ready to supply power to the load at all times; in scenarios requiring energy storage for backup power, the photovoltaic-storage unit needs to supply power to the load at any time when the grid loses power. Therefore, the second low-power control strategy... Furthermore, all battery packs in the photovoltaic energy storage unit can be shut down (i.e., the drives in all battery packs are turned off and the relays in all battery packs are disconnected) to put the photovoltaic energy storage unit into a sleep state to achieve the maximum reduction of system losses. The first low-power control strategy needs to determine whether to further shut down the battery packs based on the number of battery packs in the photovoltaic energy storage unit. For example, when the photovoltaic energy storage unit includes only one battery pack, there is no need to shut down. When the photovoltaic energy storage unit includes multiple battery packs, it is necessary to perform a shutdown operation on some battery packs, keeping at least one battery pack working normally to maintain the standby operation of the photovoltaic energy storage unit and prevent it from entering a sleep state.

[0503] That is, when each photovoltaic storage unit includes multiple battery packs and the low power control strategy is the first low power control strategy, please continue to refer to Figure 19. The above step 1031 further includes: turning off the drive of part of the battery pack in each photovoltaic storage unit and disconnecting the corresponding relay.

[0504] Specifically, the selection of battery packs to be shut down can be based on the State of Charge (SOC) of each battery pack in the photovoltaic energy storage unit. For example, battery packs with higher SOCs are prioritized for retention, while those with lower SOCs are prioritized for shutdown. For battery packs that need to be retained, their drivers and corresponding relays do not need to be turned off; however, for battery packs that need to be shut down, their drivers and corresponding relays must be turned off. When multiple retained battery packs exist in the photovoltaic energy storage unit, these battery packs can take turns providing standby power to the unit. For example, the power supply sequence and duration can be determined based on the SOC of each battery pack, and standby energy can be provided to the corresponding photovoltaic energy storage unit according to this sequence and duration to maintain its standby operation.

[0505] In addition, after the photovoltaic-storage system enters the low-power operating mode, it can monitor and analyze the changes in the backup power demand, energy storage operating mode, photovoltaic power supply voltage, remaining total power and load power in real time. If the loss reduction conditions are not met, the system can be controlled to exit the low-power operating mode, such as turning on the previously turned-off inverter and battery pack drives, activating relays, etc., to achieve flexible switching between the low-power operating mode and the normal operating mode.

[0506] As described above, the control method for a photovoltaic-storage system provided in this application embodiment includes a load, a power grid, and at least one photovoltaic-storage unit. The photovoltaic-storage unit and the power grid 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 grid-connected operation and normal operating mode, the photovoltaic supply voltage of the photovoltaic module, the remaining total power of all battery packs, and the load power of the load are obtained. Based on the photovoltaic 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 a low-power control strategy is required, the low-power control strategy is executed on the photovoltaic-storage unit to control the photovoltaic-storage system to enter a low-power operating mode. This can minimize the meaningless operation of the photovoltaic-storage unit or the situation where the operating power loss accounts for a large proportion, thereby minimizing the waste of system resources, improving the economic efficiency of electricity use, and providing high flexibility.

[0507] According to the method described in the above embodiments, this application also provides a control device for a photovoltaic-storage system, used to execute the steps in the control method of the photovoltaic-storage system described above. Please refer to FIG20, which is a schematic structural diagram of the control device for the photovoltaic-storage system provided in this application embodiment. The control device 200 for the photovoltaic-storage system is applied in 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. 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 for the photovoltaic-storage system includes an acquisition unit 201, a judgment unit 202, and an execution unit 203, wherein:

[0508] 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 grid-connected operation and normal operation mode.

[0509] The judgment unit 202 is used to determine whether the photovoltaic energy storage system needs to implement a low-power control strategy based on the photovoltaic power supply voltage, the remaining total power, and the load power.

[0510] The execution unit 203 is used to execute the low-power control strategy on the optical storage unit if a low-power control strategy is required, so as to control the optical storage system to enter a low-power operating mode.

[0511] In some embodiments, the determining unit 202 is specifically used for:

[0512] Determine whether the photovoltaic power supply voltage of all the photovoltaic modules is less than a preset power supply voltage threshold, and whether the remaining total power is less than or equal to a preset discharge cutoff power.

[0513] If so, it is determined that the optical storage system needs to implement a low-power control strategy;

[0514] If not, when the photovoltaic power supply voltage of all the photovoltaic modules is less than the preset power supply voltage threshold and the remaining total power is greater than the preset discharge cutoff power, it is determined whether the photovoltaic energy storage system needs to implement a low power consumption control strategy based on the load power.

[0515] In some embodiments, the determining unit 202 is specifically used for:

[0516] Determine whether the load power is less than a preset light load threshold;

[0517] When the load power is less than the preset light load threshold, it is determined that the optical storage system needs to implement a low power consumption control strategy.

[0518] When the load power is greater than or equal to the preset light load threshold, it is determined that the optical storage system does not need to execute the low power control strategy.

[0519] In some embodiments, the control device 200 of the optical storage system further includes a monitoring unit for:

[0520] After the photovoltaic energy storage system enters a low-power operating mode, monitor the changes in the operating status of the photovoltaic energy storage system, the photovoltaic power supply voltage, the remaining total power, and the load power.

[0521] If any of the photovoltaic power supply voltage changes to a value greater than or equal to a preset power supply voltage threshold, or if the operating state changes to an off-grid operation enabled state or an off-grid operation state, then the photovoltaic energy storage system is controlled to enter the normal operating mode.

[0522] If the photovoltaic power supply voltage is less than the preset power supply voltage threshold and the operating status remains unchanged, the photovoltaic energy storage system is controlled to enter the normal operating mode based on the changes in the remaining total power and the load power.

[0523] In some embodiments, the monitoring unit is specifically used for:

[0524] When the remaining total power changes to be greater than the preset discharge cutoff power, and the load power changes to be greater than or equal to the preset light load power threshold, the photovoltaic energy storage system is controlled to enter the normal operation mode.

[0525] In some embodiments, the execution unit 203 is specifically used for:

[0526] Turn off the drives in all of the inverters and disconnect the relays in all of the inverters;

[0527] Turn off the drives in all of the battery packs and disconnect the relays in all of the battery packs.

[0528] In some embodiments, the acquisition unit 201 is further configured to: acquire the backup power demand information and energy storage working mode of the photovoltaic energy storage system;

[0529] At this time, the judgment unit 202 is specifically used for:

[0530] Based on the backup power demand information, the energy storage operating mode, the photovoltaic power supply voltage, the remaining total power, and the load power, it is determined whether the photovoltaic-energy storage system needs to implement a low-power control strategy.

[0531] In some embodiments, the low-power control strategy includes a first low-power control strategy and a second low-power control strategy, and the determination unit 202 is specifically used for:

[0532] Determine whether the photovoltaic power supply voltage of all the photovoltaic modules is less than a preset power supply voltage threshold;

[0533] If all values ​​are less than the preset power supply voltage threshold, then determine whether the backup power demand information indicates the need for energy storage backup.

[0534] If an indication is needed for energy storage backup, then the photovoltaic energy storage system is determined to execute the first low-power control strategy based on the energy storage working mode, the remaining total power, and the load power.

[0535] If the indication is that no energy storage backup is required, then the system determines whether the photovoltaic energy storage system needs to execute the second low-power control strategy based on the energy storage operating mode, the remaining total power, and the load power.

[0536] In some embodiments, the determining unit 202 is specifically used for:

[0537] Determine whether the energy storage operating mode is a charging mode;

[0538] If it is in charging mode, when the remaining total power is greater than or equal to the preset charging cutoff power, it is determined that the photovoltaic energy storage system needs to execute the first low power control strategy.

[0539] If it is in discharge mode, then when the remaining total power is less than or equal to the preset discharge cutoff power, or when the remaining total power is greater than the preset discharge cutoff power and the load power is less than the preset light load power threshold, it is determined that the photovoltaic energy storage system needs to execute the first low power control strategy.

[0540] In some embodiments, when it is determined that the first low-power control strategy needs to be executed, the execution unit 203 is specifically used to: shut down the drives in all the inverters and disconnect the relays in all the inverters;

[0541] When it is determined that the second low-power control strategy needs to be executed, the execution unit 203 is specifically used to: shut down the drives in all the inverters and disconnect the relays in all the inverters; shut down the drives in all the battery packs and disconnect the relays in all the battery packs.

[0542] In some embodiments, when each of the energy storage units includes multiple battery packs and it is determined that the first low-power control strategy needs to be executed, the execution unit 203 is further configured to:

[0543] Shut down the drive of a portion of the battery pack in each of the energy storage units and disconnect the corresponding relays.

[0544] It should be noted that the specific details of each module unit in the control device 200 of the above-mentioned photovoltaic energy storage system have been described in detail in the embodiments of the control method of the above-mentioned photovoltaic energy storage system, and will not be repeated here.

[0545] In some embodiments, the control device of the optical storage system in this application can be an electronic device or a component of an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal device. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television set (TV), ATM, or self-service machine, etc. This application does not specifically limit the scope of the electronic device.

[0546] In some embodiments, as shown in FIG21, this application embodiment 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, it implements the various processes of the above-described control method embodiment of the optical storage system and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0547] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0548] Figure 22 is a schematic diagram of the hardware structure of an electronic device that implements an embodiment of this application.

[0549] The electronic device 400 includes, but is not limited to, components such as: radio frequency unit 401, network module 402, audio output unit 403, input unit 404, sensor 405, display unit 406, user input unit 407, interface unit 408, memory 409, and processor 410.

[0550] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described control method for a power generation system or control method for a photovoltaic-storage system, and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0551] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0552] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the control method of the power generation system or the control method of the photovoltaic energy storage system described above.

[0553] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0554] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above-described control method for the power generation system or control method for the photovoltaic energy storage system, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0555] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0556] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0557] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0558] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0559] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0560] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for a power generation system, characterized in that, The power generation system includes at least one power generation module, each power generation module includes an energy storage system and an inverter connected to the energy storage system, each energy storage system includes at least one battery pack, and the method includes: The system obtains the category of the power generation module, the operating scenario of the power generation system, and the backup power requirement of the power generation system; the operating scenario includes off-grid scenario or grid-connected scenario; the category includes pure energy storage category or non-pure energy storage category, and the power generation system of non-pure energy storage category also includes photovoltaic system; Based on the category, the working scenario, and the backup power requirement, control at least one of the working states of each of the power generation modules and each of the battery packs; the working states include: a first energy-saving state, a second energy-saving state, or a normal working state.

2. The control method for the power generation system according to claim 1, characterized in that, The control of at least one of the operating states of each of the power generation modules and each of the battery packs based on the category, the working scenario, and the backup power requirement includes: Obtain the first operating parameters of the photovoltaic system in the non-pure energy storage type power generation module; The non-pure storage type power generation module whose first working parameter is greater than the first threshold is identified as the first power generation module, and the remaining power generation modules other than the first power generation module are identified as the second power generation module. Based on the working scenario and the backup power requirement, control at least one of the working states of the second power generation module and the working states of each battery pack in the second power generation module.

3. The control method for the power generation system according to claim 2, characterized in that, The step of controlling at least one of the operating states of the second power generation module and the operating states of each battery pack in the second power generation module based on the working scenario and the backup power requirement includes: In the grid-connected scenario, based on the backup power demand and the charging and discharging status of the energy storage system, the working status of each second power generation module and / or the working status of each battery pack are controlled. In the off-grid scenario, the operating status of each of the second power generation modules and / or the operating status of each of the battery packs are controlled based on the load power of the power generation system.

4. The control method for the power generation system according to claim 3, characterized in that, In the grid-connected scenario, based on the backup power demand and the charging and discharging state of the energy storage system, controlling the operating state of each of the second power generation modules and / or the operating state of each of the battery packs includes: Based on the charging and discharging states, the target judgment conditions are obtained; Based on the target judgment conditions, the charging and discharging state, and the backup power requirement, control the working state of each of the second power generation modules and / or the working state of each of the battery packs.

5. The control method for the power generation system according to claim 4, characterized in that, The step of controlling the operating state of each second power generation module and / or each battery pack based on the target judgment conditions, the charging and discharging state, and the backup power requirement includes: When there is no backup power requirement and the target judgment condition is met, control each of the second power generation modules to enter the first energy-saving state; When there is no backup power requirement, the target judgment condition is not met, and the charging / discharging state is the discharging state, at least some of the second power generation modules are controlled to enter the first energy-saving state. When there is no backup power requirement, the target judgment condition is not met, and the charging / discharging state is the charging state, control each of the second power generation modules to maintain the normal operating state.

6. The control method for the power generation system according to claim 5, characterized in that, When there is no backup power requirement, the target judgment condition is not met, and the charging / discharging state is a discharging state, controlling at least some of the second power generation modules to enter the first energy-saving state includes: Based on the load power corresponding to the power generation system, a first target power generation module is determined from all the second power generation modules; the sum of the load power of the first target power generation module and the load power of the first power generation module is not less than the load power; The first target power generation module is controlled to enter the normal working state, and the remaining second power generation modules other than the first target power generation module are controlled to enter the first energy-saving state.

7. The control method for the power generation system according to claim 4, characterized in that, The step of controlling the operating state of each second power generation module and / or each battery pack based on the target judgment conditions, the charging and discharging state, and the backup power requirement includes: When there is a backup power requirement and the target judgment condition is met, control each of the second power generation modules to enter the second energy-saving state; When there is a backup power requirement, the target judgment condition is not met, and the charging / discharging state is the discharging state, at least some of the second power generation modules are controlled to enter the second energy-saving state. When there is a backup power requirement, the target judgment condition is not met, and the charging / discharging state is the charging state, control each of the second power generation modules to maintain the normal operating state.

8. The control method for the power generation system according to claim 7, characterized in that, When there is a backup power requirement, the target judgment condition is not met, and the charging / discharging state is a discharging state, controlling at least some of the second power generation modules to enter the second energy-saving state includes: Based on the load power corresponding to the power generation system, a second target power generation module is determined from all the second power generation modules; the sum of the load power of the second target power generation module and the load power of the first power generation module is not less than the load power; The second target power generation module is controlled to enter the normal working state, and the remaining second power generation modules other than the second target power generation module are controlled to enter the second energy-saving state.

9. The control method for a power generation system according to any one of claims 4-8, characterized in that, The step of obtaining the target judgment conditions based on the charging and discharging state includes: The first total charge value is obtained by weighted summation of the states of charge of each energy storage system. When the charging / discharging state is the charging state, the target judgment condition is determined to be that the first total charge value is not less than the first charge threshold. When the charging / discharging state is the discharging state, the target judgment condition is determined to be that the first total charge value is not greater than the second charge threshold, and / or that the load power corresponding to the power generation system is not greater than the second threshold.

10. The control method for the power generation system according to claim 3, characterized in that, In the off-grid scenario, controlling the operating state of each of the second power generation modules and / or the operating state of each of the battery packs based on the load power of the power generation system includes: Based on the load power corresponding to the power generation system, the third target power generation module in each of the second power generation modules is controlled to enter the second energy-saving state.

11. The control method for a power generation system according to claim 10, characterized in that, The step of controlling the third target power generation module in each of the second power generation modules to enter the second energy-saving state based on the load power corresponding to the power generation system includes: The load power of the second power generation module is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is determined as the fourth target power generation module, and the remaining second power generation modules other than the fourth target power generation module are determined as the third target power generation module. The fourth target power generation module is controlled to maintain its normal operating state, and the third target power generation module is controlled to enter the second energy-saving state.

12. The control method for a power generation system according to claim 11, characterized in that, The step of accumulating the load power of the second power generation module until the sum of the accumulated value and the load power of the first power generation module is not less than the load power, and then determining the second power generation module corresponding to the accumulated value as the fourth target power generation module, includes: Obtain the load power corresponding to each of the second power generation modules and the state of charge of each of the second power generation modules; Based on the order of the states of charge, the load power of the second power generation module corresponding to the states of charge is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module.

13. The control method for a power generation system according to claim 11, characterized in that, The step of accumulating the load power of the second power generation module until the sum of the accumulated value and the load power of the first power generation module is not less than the load power, and then determining the second power generation module corresponding to the accumulated value as the fourth target power generation module, includes: Obtain the load power corresponding to each of the power generation modules; Based on the order of the load power, the load power is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The second power generation module corresponding to the accumulated value is then determined as the fourth target power generation module.

14. The control method for the power generation system according to claim 3, characterized in that, In the off-grid scenario, controlling the operating state of each of the second power generation modules and / or the operating state of each of the battery packs based on the load power of the power generation system includes: The operating state of each battery pack in the second power generation module is controlled based on the load power corresponding to each battery pack in the second power generation module that maintains the normal operating state.

15. The control method for a power generation system according to claim 14, characterized in that, The method of controlling the operating state of each battery pack in the second power generation module based on the load power corresponding to each battery pack in the second power generation module to maintain the normal operating state includes: The system controls the first target battery pack in the battery pack to enter the second energy-saving state, and controls the second target battery pack in the battery pack other than the first target battery pack to maintain the normal operating state.

16. The control method for a power generation system according to claim 15, characterized in that, The step of controlling the first target battery pack in the battery pack to enter the second energy-saving state, and controlling the second target battery pack (excluding the first target battery pack) in the battery pack to maintain the normal operating state includes: The load power of the battery pack is accumulated until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is determined as the second target battery pack, and the remaining battery packs in the battery pack other than the second target battery pack are determined as the first target battery pack. The second target battery pack is controlled to maintain the normal operating state, and the first target battery pack is controlled to enter the second energy-saving state.

17. The control method for a power generation system according to claim 16, characterized in that, The step of accumulating the load power of the battery pack until the sum of the accumulated value and the load power of the first power generation module is not less than the load power, and determining the battery pack corresponding to the accumulated value as the second target battery pack, includes: Obtain the load power and state of charge of each battery pack; Based on the order of the states of charge, the load power of the battery packs corresponding to the states of charge is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is then determined as the second target battery pack.

18. The control method for a power generation system according to claim 16, characterized in that, The step of accumulating the load power of the battery pack until the sum of the accumulated value and the load power of the first power generation module is not less than the load power, and determining the battery pack corresponding to the accumulated value as the second target battery pack, includes: Obtain the load power corresponding to each of the battery packs; Based on the order of the load power, the load power is accumulated from largest to smallest until the sum of the accumulated value and the load power of the first power generation module is not less than the load power. The battery pack corresponding to the accumulated value is then determined as the second target battery pack.

19. The control method for the power generation system according to claim 3, characterized in that, In the off-grid scenario, controlling the operating state of each of the second power generation modules and / or the operating state of each of the battery packs based on the load power of the power generation system includes: Obtain the state of charge of each of the second power generation modules; The second power generation module whose state of charge is not greater than the second charge threshold is controlled to enter the second energy-saving state, and the second power generation module whose state of charge is greater than the second charge threshold is controlled to enter the normal operation state; Based on the load power corresponding to the power generation system, the third target power generation module in the second power generation module whose state of charge is greater than the second state of charge threshold is controlled to enter the second energy-saving state; When the number of second power generation modules maintaining the normal operating state is 1, the operating state of each battery pack in the second power generation module maintaining the normal operating state is controlled based on the load power of each battery pack in the second power generation module maintaining the normal operating state.

20. The control method for a power generation system according to any one of claims 1-19, characterized in that, The control of at least one of the operating states of each of the power generation modules and each of the battery packs based on the category, the working scenario, and the backup power requirement includes: In a discharge state and after controlling at least one of the power generation modules to be out of the normal operating state, if the sum of the load power corresponding to the power generation modules in the normal operating state is less than the load power corresponding to the power generation system, at least some of the power generation modules that are not in the normal operating state are controlled to enter the normal operating state, so that the sum of the load power corresponding to the power generation modules in the normal operating state is not less than the load power.

21. The control method for a power generation system according to any one of claims 1-20, characterized in that, The control of at least one of the operating states of each of the power generation modules and each of the battery packs based on the category, the working scenario, and the backup power requirement includes: If at least one of the power generation module and the battery pack is not in the normal operating state, a target comparison value is determined based on the frequency and amplitude of the inverter's output voltage. If the target comparison value is within a preset abnormal range, control at least one of the power generation modules and / or at least one of the battery packs that are not in the normal operating state to enter the normal operating state.

22. The control method for a power generation system according to any one of claims 1-21, characterized in that, The control of at least one of the operating states of each of the power generation modules and each of the battery packs based on the category, the working scenario, and the backup power requirement includes: In the case where the first operating parameter of the photovoltaic system in the non-pure energy storage type power generation module is greater than a first threshold and the power generation module with the first operating parameter greater than the first threshold is not in the normal operating state, the power generation module with the first operating parameter greater than the first threshold is controlled to enter the normal operating state, and / or at least one of the battery packs included in the power generation module with the first operating parameter greater than the first threshold.

23. The control method for a power generation system according to any one of claims 1-22, characterized in that, Controlling entry into the first energy-saving state includes: The inverter corresponding to the energy storage system that has entered the first energy-saving state is shut down, and / or the battery pack included in the energy storage system is shut down.

24. The control method for a power generation system according to any one of claims 1-23, characterized in that, Controlling entry into the second energy-saving state includes: The power modules inside the power generation module and / or battery pack that enter the second energy-saving state are controlled to block out waveforms or operate based on a target frequency, which is lower than the normal operating frequency, and the battery pack included in the energy storage system is controlled to maintain power supply.

25. The control method for a power generation system according to claim 7, characterized in that, The step of controlling the operating state of each second power generation module and / or each battery pack based on the target judgment conditions, the charging and discharging state, and the backup power requirement includes: If there is a backup power requirement and the target judgment condition is met, shut down the drives in all inverters and disconnect the relays in all inverters; shut down the drives in all battery packs and disconnect the relays in all battery packs.

26. A control device for a power generation system, characterized in that, The power generation system includes at least one power generation module, each power generation module includes an energy storage system and an inverter connected to the energy storage system, each energy storage system includes at least one battery pack, and the device includes: The first processing module is used to obtain the category of the power generation module, the working scenario of the power generation system, and the backup power requirement of the power generation system; the working scenario includes off-grid scenario or grid-connected scenario; the category includes pure storage category or non-pure storage category, and the power generation system of non-pure storage category also includes photovoltaic system; The second processing module is used to control at least one of the working states of each of the power generation modules and each of the battery packs based on the category, the working scenario and the backup power requirement; the working states include: a first energy-saving state, a second energy-saving state or a normal working state.

27. A power generation system, characterized in that, include: At least one power generation module, each power generation module including an energy storage system and an inverter connected to the energy storage system, each energy storage system including at least one battery pack; The control device for the power generation system as described in claim 26 is electrically connected to the power generation module.

28. The power generation system according to claim 27, characterized in that, The power generation module also includes a photovoltaic system, which is connected to the inverter.

29. The power generation system according to claim 27, characterized in that, The power generation module is either an integrated photovoltaic-storage unit or a separate photovoltaic-storage unit.

30. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the control method of the power generation system as described in any one of claims 1-25.

31. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the control method of the power generation system as described in any one of claims 1-25.

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