Control method and device of power generation system and power generation system

Abstract

The present application discloses a control method, device and power generation system for a power generation system, and belongs to the field of photovoltaic systems. The control method of the power generation system includes: obtaining the category of the power generation module, the working scenario of the power generation system and the backup power demand of the power generation system; the working scenario includes an off-grid scenario or a grid-connected scenario; based on the category, working scenario and backup power demand, controlling at least one of the working states of each power generation module and each battery pack; the working state includes: a first energy-saving state, a second energy-saving state or a normal working state. The control method of the power generation system of the present application can save energy consumption and significantly reduce electricity costs while ensuring that the power generation system can meet the power supply demand, thereby improving the user experience.

Description

Technical Field

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

[0002] During the operation of the power generation module, there are many scenarios such as off-grid or grid-connected. In the related technologies, due to the influence of factors such as load power and photovoltaic power in various scenarios, the power generation module is prone to long-term meaningless standby, or the system equipment loss accounts for a large ratio of battery discharge power, or there are also problems such as most of the energy output by the battery is used for standby loss of its own equipment. The above problems will cause energy waste and increase electricity costs, thereby affecting the user experience. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a control method, device and power generation system of a power generation system, which can reduce the probability of problems such as long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery is used for standby loss of its own equipment while ensuring that the power generation system can meet the power supply demand, thereby saving energy consumption and significantly reducing electricity costs.

[0004] In a first aspect, the present application provides a control method for a power generation system, wherein the power generation system includes at least one power generation module, each of the power generation modules includes an energy storage system and an inverter connected to the energy storage system, each of the energy storage systems includes at least one battery pack, and the method includes:

[0005] Obtaining the category of the power generation module, the working scenario of the power generation system and the backup power demand of the power generation system; the working scenario includes an off-grid scenario or a grid-connected scenario; the category includes a pure storage category or a non-pure storage category, and the power generation system of the non-pure storage category also includes a photovoltaic system;

[0006] Based on the category, the working scenario and the backup power demand, at least one of the working states of each of the power generation modules and each of the battery packs is controlled; the working states include: a first energy-saving state, a second energy-saving state or a normal working state.

[0007] According to the control method of the power generation system of the present application, the working status of the power generation module and the battery pack is adjusted by combining the off-grid scenario and the presence or absence of backup power demand. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery is used for standby loss of its own equipment. Energy consumption is saved, electricity costs are significantly reduced, and user experience is improved.

[0008] According to an embodiment of the present application, the controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario, and the backup power demand includes:

[0009] Acquire a first operating parameter of a photovoltaic system in the non-pure storage type power generation module;

[0010] Determine a non-pure storage type power generation module whose first operating parameter is greater than a first threshold as a first power generation module, and determine the remaining power generation modules among all power generation modules except the first power generation module as second power generation modules;

[0011] Based on the working scenario and the backup power demand, at least one of the working state of the second power generation module and the working state of each of the battery packs in the second power generation module is controlled.

[0012] According to an embodiment of the present application, the controlling at least one of the working state of the second power generation module and the working state of each battery pack in the second power generation module based on the working scenario and the backup power demand includes:

[0013] In the grid-connected scenario, based on the backup power demand and the charge and discharge status of the energy storage system, controlling the working status of each of the second power generation modules and / or the working status of each of the battery packs;

[0014] In the off-grid scenario, the working state of each of the second power generation modules and / or the working state of each of the battery packs are controlled based on the load power of the power generation system.

[0015] According to an embodiment of the present application, in the grid-connected scenario, based on the backup power demand and the charge and discharge state of the energy storage system, controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs includes:

[0016] Based on the charge and discharge state, obtaining a target judgment condition;

[0017] Based on the target judgment condition, the charging and discharging status and the backup power demand, the working status of each of the second power generation modules and / or the working status of each of the battery packs is controlled.

[0018] According to an embodiment of the present application, the controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs based on the target judgment condition, the charging and discharging state, and the backup power demand includes:

[0019] When there is no backup power demand and the target judgment condition is met, controlling each of the second power generation modules to enter the first energy-saving state;

[0020] When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter the first energy-saving state;

[0021] When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is the charging state, each of the second power generation modules is controlled to maintain the normal working state.

[0022] According to an embodiment of the present application, when there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter the first energy-saving state includes:

[0023] 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;

[0024] The first target power generation module is controlled to enter the normal working state, and the remaining second power generation modules among all the second power generation modules except the first target power generation module are controlled to enter the first energy-saving state.

[0025] According to an embodiment of the present application, the controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs based on the target judgment condition, the charging and discharging state, and the backup power demand includes:

[0026] When there is a demand for backup power and the target judgment condition is met, controlling each of the second power generation modules to enter the second energy-saving state;

[0027] When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter the second energy-saving state;

[0028] When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a charging state, each of the second power generation modules is controlled to maintain the normal working state.

[0029] According to an embodiment of the present application, when there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter the second energy-saving state includes:

[0030] Based on the load power corresponding to the power generation system, determine a second target power generation module from all 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;

[0031] The second target power generation module is controlled to enter the normal working state, and the remaining second power generation modules among all the second power generation modules except the second target power generation module are controlled to enter the second energy-saving state.

[0032] According to an embodiment of the present application, the acquiring of a target judgment condition based on the charge and discharge state includes:

[0033] Performing a weighted summation on the charge states of each of the energy storage systems to obtain a first total charge value;

[0034] When the charge-discharge state is a charging state, determining that the target judgment condition is that the first total charge value is not less than a first charge threshold value;

[0035] When the charging and discharging state is the discharging state, the target judgment condition is determined as that the first total charge value is not greater than a second charge threshold, and / or that the load power corresponding to the power generation system is not greater than a second threshold.

[0036] According to an embodiment of the present application, in the off-grid scenario, based on the load power of the power generation system, controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs includes:

[0037] 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.

[0038] According to an embodiment of the present application, 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:

[0039] Accumulate 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, determine the second power generation module corresponding to the accumulated value as the fourth target power generation module, and determine the remaining second power generation modules in the second power generation module except the fourth target power generation module as the third target power generation module;

[0040] The fourth target power generation module is controlled to maintain the normal working state, and the third target power generation module is controlled to enter the second energy-saving state; the number of the fourth target power generation module is at least one.

[0041] According to an embodiment of the present application, 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 determining the second power generation module corresponding to the accumulated value as the fourth target power generation module includes:

[0042] Obtaining the load power corresponding to each of the second power generation modules and the charge state of each of the second power generation modules;

[0043] Based on the order of the charge states, the load powers of the second power generation modules corresponding to the charge states are accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

[0044] According to an embodiment of the present application, 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 determining the second power generation module corresponding to the accumulated value as the fourth target power generation module includes:

[0045] Obtaining the load power corresponding to each of the power generation modules;

[0046] Based on the order of the load powers, the load powers are accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

[0047] According to an embodiment of the present application, in the off-grid scenario, based on the load power of the power generation system, controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs includes:

[0048] Based on the load power corresponding to each battery pack in the second power generation module in the normal working state, the working state of each battery pack in the second power generation module in the normal working state is controlled.

[0049] According to an embodiment of the present application, controlling the working state of each battery pack in the second power generation module in the normal working state based on the load power corresponding to each battery pack in the second power generation module in the normal working state includes:

[0050] A first target battery pack in the battery pack is controlled to enter the second energy-saving state, and a second target battery pack in the battery pack other than the first target battery pack is controlled to maintain the normal working state.

[0051] According to an embodiment of the present application, controlling the first target battery pack in the battery pack to enter the second energy-saving state, and controlling the second target battery pack in the battery pack other than the first target battery pack to maintain the normal working state, includes:

[0052] Accumulate 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, determine the battery pack corresponding to the accumulated value as the second target battery pack, and determine the remaining battery packs in the battery pack except the second target battery pack as the first target battery pack;

[0053] The second target battery pack is controlled to maintain the normal working state, and the first target battery pack is controlled to enter the second energy-saving state; the number of the second target battery pack is at least one.

[0054] According to an embodiment of the present application, 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:

[0055] Obtaining the load power corresponding to each of the battery packs and the state of charge of each of the battery packs;

[0056] Based on the order of the charge states, the load powers of the battery packs corresponding to the charge states are accumulated from large to small 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.

[0057] According to an embodiment of the present application, 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:

[0058] Obtaining the load power corresponding to each of the battery packs;

[0059] Based on the order of the load powers, the load powers are accumulated from large to small 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.

[0060] According to an embodiment of the present application, in the off-grid scenario, based on the load power of the power generation system, controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs includes:

[0061] Acquiring the state of charge of each of the second power generation modules;

[0062] Control the second power generation module whose state of charge is not greater than the second charge threshold to enter the second energy-saving state, and control the second power generation module whose state of charge is greater than the second charge threshold to enter the normal working state;

[0063] Based on the load power corresponding to the power generation system, controlling the third target power generation module in the second power generation module whose state of charge is greater than the second charge threshold to enter the second energy-saving state;

[0064] When the number of the second power generation modules maintaining the normal working state is 1, the working state of each battery pack in the second power generation module in the normal working state is controlled based on the load power of each battery pack in the second power generation module maintaining the normal working state.

[0065] According to an embodiment of the present application, the controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario, and the backup power demand includes:

[0066] In the discharge state and after controlling at least one of the power generation modules not to be in the normal working state, when the sum of the load powers corresponding to the power generation modules in the normal working state is less than the load power corresponding to the power generation system, at least some of the power generation modules among all the power generation modules that are not in the normal working state are controlled to enter the normal working state, so that the sum of the load powers corresponding to the power generation modules in the normal working state is not less than the load power.

[0067] According to an embodiment of the present application, the controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario, and the backup power demand includes:

[0068] determining a target comparison value based on a frequency and an amplitude of an output voltage of the inverter when at least one of the power generation module and the battery pack is controlled not to be in the normal operating state;

[0069] When the target comparison value is within a preset abnormal interval, at least one of the power generation modules that are not in the normal working state, and / or at least one of the battery packs, are controlled to enter the normal working state.

[0070] According to an embodiment of the present application, the controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario, and the backup power demand includes:

[0071] When the first operating parameter of the photovoltaic system in the non-pure storage type power generation module is greater than the first threshold and the power generation module whose first operating parameter is greater than the first threshold is not in the normal working state, the power generation module whose first operating parameter is greater than the first threshold and / or at least one of the battery packs included in the power generation module whose first operating parameter is greater than the first threshold are controlled to enter the normal working state.

[0072] According to one embodiment of the present application, controlling entry into the first energy-saving state includes:

[0073] Control the inverter corresponding to the energy storage system entering the first energy-saving state to shut down, and / or control the battery pack included in the energy storage system to shut down.

[0074] According to one embodiment of the present application, controlling entry into the second energy-saving state includes:

[0075] The power generation module and / or the power module inside the battery pack entering the second energy-saving state are controlled to block the wave or operate based on a target frequency, wherein 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.

[0076] In a second aspect, the present application provides a control device for a power generation system, wherein the power generation system includes at least one power generation module, each of the power generation modules includes an energy storage system and an inverter connected to the energy storage system, each of the energy storage systems includes at least one battery pack, and the device includes:

[0077] A 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 demand of the power generation system; the working scenario includes an off-grid scenario or a grid-connected scenario; the category includes a pure storage category or a non-pure storage category, and the power generation system of the non-pure storage category also includes a photovoltaic system;

[0078] 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 demand; the working states include: a first energy-saving state, a second energy-saving state or a normal working state.

[0079] According to the control device of the power generation system of the present application, the working state of the power generation module and the battery pack is adjusted by combining the off-grid scenario and the presence or absence of backup power demand. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery is used for standby loss of its own equipment. Energy consumption is saved, electricity costs are significantly reduced, and user experience is improved.

[0080] In a third aspect, the present application provides a power generation system, comprising:

[0081] At least one power generation module, each of the power generation modules comprising an energy storage system and an inverter connected to the energy storage system, each of the energy storage systems comprising at least one battery pack;

[0082] As described in the second aspect, the control device of the power generation system is electrically connected to the power generation module.

[0083] According to the power generation system of the present application, the working status of the power generation module and the battery pack is adjusted by combining the off-grid scenario and the presence or absence of backup power demand. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery is used for standby loss of its own equipment. This saves energy consumption, significantly reduces electricity costs, and thus improves user experience.

[0084] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method for the power generation system as described in the first aspect above.

[0085] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the control method of the power generation system as described in the first aspect above.

[0086] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0087] By combining the off-grid scenario and the presence or absence of backup power demand to adjust the working status of the power generation module and the battery pack, while ensuring that the power generation system can meet the power supply demand, it can reduce the probability of long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery is used for standby loss of its own equipment. This saves energy consumption, significantly reduces electricity costs, and thus improves user experience.

[0088] Furthermore, by controlling the shutdown of the inverter corresponding to the energy storage system and / or controlling the shutdown of the battery pack included in the energy storage system, 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 energy output by the battery used for standby loss of its own equipment can be reduced, thereby achieving energy saving and loss reduction and reducing electricity costs.

[0089] Furthermore, 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 a 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 is also possible to achieve rapid response switching when the system needs to exit the second energy-saving state, thereby increasing the switching rate and maintaining stable and normal operation of the system.

[0090] Furthermore, the load power is accumulated by utilizing the size of the load power or the level of the charge state, so that all the power generation modules whose accumulated value is not less than the load power are determined as the fourth target power generation modules, so as to control the fourth target power generation modules to maintain normal working state 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, thereby further reducing invalid consumption, reducing electricity costs, and thus improving user experience.

[0091] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0093] Figure 1 It is one of the flow charts of the control method of the power generation system provided in the embodiment of the present application;

[0094] Figure 2 This is a second flow chart of a control method for a power generation system provided in an embodiment of the present application;

[0095] Figure 3 This is a third flow chart of the control method of the power generation system provided in the embodiment of the present application;

[0096] Figure 4 is a schematic diagram of the structure of a control device for a power generation system provided in an embodiment of the present application;

[0097] Figure 5 It is one of the structural schematic diagrams of the power generation system provided in the embodiment of the present application;

[0098] Figure 6 This is the second structural schematic diagram of the power generation system provided in the embodiment of the present application;

[0099] Figure 7 This is the third structural schematic diagram of the power generation system provided in the embodiment of the present application;

[0100] Figure 8 This is the fourth structural schematic diagram of the power generation system provided in the embodiment of the present application;

[0101] Fig. 9 This is the fifth structural diagram of the power generation system provided in the embodiment of the present application;

[0102] Fig.10 This is the sixth structural schematic diagram of the power generation system provided in the embodiment of the present application;

[0103] Fig.11 This is the seventh structural diagram of the power generation system provided in the embodiment of the present application;

[0104] Fig.12 This is the eighth structural schematic diagram of the power generation system provided in the embodiment of the present application. DETAILED DESCRIPTION

[0105] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0106] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0107] In the following, in combination with the accompanying drawings, the control method of the power generation system, the control device of the power generation system, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0108] The control method of the power generation system may be applied to a terminal, and may be specifically executed by hardware or software in the terminal.

[0109] The control method of the power generation system provided in the embodiment of the present application can be executed by an electronic device or a functional module or functional entity in the electronic device that can implement the control method of the power generation system. The electronic devices mentioned in the embodiment of the present application include but are not limited to mobile phones, tablet computers, computers, cameras and wearable devices. The control method of the power generation system provided in the embodiment of the present application is described below using the electronic device as an example of the execution subject.

[0110] like Figure 1 As shown, the control method of the power generation system includes: step 110 and step 120.

[0111] Step 110: Obtain the type of power generation module, the working scenario of the power generation system, and the backup power demand of the power generation system;

[0112] In this step, if Figure 5 As shown, the power generation system includes at least one power generation module.

[0113] The categories of power generation modules may include pure storage categories or non-pure storage categories.

[0114] For the pure storage type power generation module, it includes an energy storage system and an inverter connected to the energy storage system.

[0115] The non-pure storage type power generation module includes: a photovoltaic system, an energy storage system and an inverter, wherein the inverter is connected to the photovoltaic system and the energy storage system respectively.

[0116] The energy storage system includes at least one battery pack, such as Figure 5 The battery shown is battery 1 to battery N, where N is a positive integer.

[0117] Each power generation module is connected to a load respectively.

[0118] In the grid-connected scenario, each power generation module can be connected to the grid via an AC line.

[0119] In the actual implementation process, an electric meter or gateway can be set at the grid connection point to collect electric signals.

[0120] Working scenarios include: off-grid scenarios or grid-connected scenarios.

[0121] The backup power demand includes: having backup power demand or having no backup power demand.

[0122] In some embodiments, there is a need for backup power when connected to the grid in a Gateway scenario, but there is no need for backup power when connected to the grid in an electricity meter scenario.

[0123] When the power generation system includes multiple power generation modules, the power generation modules included in the power generation system may all be pure storage types, or may all be non-pure storage types, or may also include some pure storage types and some non-pure storage types.

[0124] In the actual control process, each power generation module can be controlled individually.

[0125] Step 120 controls at least one of the working state of each power generation module and the working state of each battery pack based on the category, working scenario and backup power demand.

[0126] In this step, the working state includes: a first energy-saving state, a second energy-saving state or a normal working state.

[0127] The first energy-saving state and the second energy-saving state are two working states different from the normal working state.

[0128] Under different working conditions, the working conditions of each power generation module, the inverter included in the power generation module, and the battery pack may be different.

[0129] In the actual implementation process, the power generation module or battery pack can be put into a corresponding energy-saving state by controlling unnecessary components in the power generation module or battery pack to not work, shut down, or work at a lower power, so as to reduce the meaningless standby time of the power generation module, reduce the ratio of system equipment loss to battery discharge power, or reduce the proportion of battery output energy used for its own equipment standby loss.

[0130] It should be noted that compared with the first energy-saving state, the second energy-saving state can not only reduce energy consumption, but also improve the response rate of the entire system when exiting the second energy-saving state by controlling some components to maintain the power-on state.

[0131] In some embodiments, controlling the entry into the first energy-saving state may include:

[0132] Control the inverter corresponding to the energy storage system entering the first energy-saving state to shut down, and / or control the battery pack included in the energy storage system to shut down.

[0133] In this embodiment, controlling a certain energy storage system to enter the first energy-saving state may 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.

[0134] In some embodiments, after controlling the battery pack to shut down, the battery pack may be controlled to hibernate.

[0135] According to the control method of the power generation system provided in the embodiment of the present application, by controlling the shutdown of the inverter corresponding to the energy storage system and / or controlling the shutdown of the battery pack included in the energy storage system, it is possible to reduce the meaningless standby time of the power generation module, reduce the ratio of system equipment loss to battery discharge power, and reduce the proportion of energy output by the battery used for standby loss of its own equipment, etc., thereby achieving energy saving and loss reduction and reducing electricity costs.

[0136] In some embodiments, controlling the entry into the second energy-saving state may include:

[0137] The power generation module and / or the power module inside the battery pack that enters the second energy-saving state is controlled to block the wave or operate based on a 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.

[0138] In this embodiment, the target frequency is lower than the frequency at which the power module normally operates.

[0139] The target frequency can be customized by the user.

[0140] In the actual implementation process, Fig.12 As shown, controlling the battery pack to maintain power supply can be manifested as controlling the control unit inside the battery pack to maintain power supply.

[0141] It should be noted that when the power module is blocked or working at a lower frequency, and the battery pack remains powered, and the system subsequently meets certain conditions and needs to exit the second energy-saving state, there is no need to go through the complete power-on relay self-test process. Compared with the inverter shutdown or the battery pack power-off shutdown, the system response and switching rate are relatively faster.

[0142] According to the control method of the power generation system provided in the embodiment of the present application, by controlling the power generation module entering the second energy-saving state and / or the power module inside the battery pack to block the wave or operate based on the target frequency, the target frequency is lower than the normal working 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 is also possible to achieve rapid response switching when the system needs to exit the second energy-saving state, thereby improving the switching rate and maintaining stable and normal operation of the system.

[0143] In the actual implementation process, the working status of each power generation module can be independently controlled, and each energy storage system under the same power generation module and each battery pack under the same energy storage system can be independently controlled.

[0144] In the present application, the power generation condition of the photovoltaic system, such as whether it can work normally, is judged based on the first working parameter. The power generation condition of the photovoltaic system, combined with the off-grid scenario and whether there is a need for backup power, is used to judge whether the power generation module and the battery pack need to maintain normal working conditions. When there is no need to maintain normal working conditions, while ensuring that the power generation system can meet the power supply demand, the corresponding energy-saving state is entered to reduce the probability of long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery being used for standby loss of its own equipment, thereby saving energy consumption and significantly reducing electricity costs.

[0145] According to the control method of the power generation system provided in the embodiment of the present application, the working status of the power generation module and the battery pack is adjusted by combining the off-grid scenario and the presence or absence of backup power demand. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery is used for standby loss of its own equipment. Energy consumption is saved, electricity costs are significantly reduced, and user experience is improved.

[0146] In some embodiments, step 120 may include:

[0147] Acquire a first operating parameter of a photovoltaic system in a non-pure storage type power generation module;

[0148] Determine a non-pure storage type power generation module whose first operating parameter is greater than a first threshold as a first power generation module, and determine the remaining power generation modules among all the power generation modules except the first power generation module as second power generation modules;

[0149] Based on the working scenario and the backup power demand, the working state of the second power generation module and at least one of the working states of each battery pack in the second power generation module are controlled.

[0150] 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, photovoltaic power, etc.

[0151] The first threshold is a smaller value, and the specific value of the first threshold can be customized by the user.

[0152] The category of the first threshold value should be consistent with the category of the first operating parameter.

[0153] Taking the photovoltaic current as the first operating parameter as an example, the first threshold value may be the minimum current or a current value relatively close to the minimum current.

[0154] When the first operating parameter is greater than the first threshold, it indicates that the power generation capacity of the photovoltaic system is normal, and it can be considered that the photovoltaic power generation is sufficient to compensate for the standby loss, and there is no need to control related components to enter the energy-saving state.

[0155] When the first operating parameter is not greater than the first threshold, it indicates that the power generation capacity of the photovoltaic system is relatively small.

[0156] A power generation module whose first operating parameter is greater than a first threshold is determined as a first power generation module.

[0157] The number of the first power generation modules may be 0, 1, or more. In some embodiments, the number of the first power generation modules may also be the number of all power generation modules included in the power generation system.

[0158] The second power generation module is the remaining power generation module among all the power generation modules except the first power generation module.

[0159] The second power generation module is a module that needs to determine whether a loss reduction strategy needs to be executed.

[0160] The number of the second power generation modules may be 0, 1, or more. In some embodiments, the number of the second power generation modules may also be the number of all power generation modules included in the power generation system.

[0161] It can be understood that, in the scenario where all power generation modules included in the power generation system are of the pure storage type, all power generation modules are second power generation modules.

[0162] For the scenario where some of the power generation modules included in the power generation system are of pure storage category and some are of non-pure storage category, the power generation modules of the pure storage category are all second power generation modules, and among the power generation modules of the non-pure storage category, the power generation modules whose first operating parameter is not greater than the first threshold can be the second power generation modules.

[0163] For the scenario where all the power generation modules included in the power generation system are of non-pure storage type, they can be directly classified based on the first operating parameter of the photovoltaic system included in each power generation module, and the power generation module whose first operating parameter is not greater than the first threshold is determined as the second power generation module.

[0164] In some embodiments, after determining the non-pure storage type power generation module whose first operating parameter is greater than the first threshold as the first power generation module, and determining the remaining power generation modules except the first power generation module among all the power generation modules as the second power generation modules, the method may further include:

[0165] Control the first power generation module to maintain a normal working state.

[0166] For the second power generation module, the working state of the second power generation module and / or the working state of the battery pack in the second power generation module can be controlled based on the working scenario and the backup power demand.

[0167] The specific control method for the working state of the second power generation module and / or the battery pack in the second power generation module is described below.

[0168] In some embodiments, based on the working scenario and the backup power requirement, controlling at least one of the working state of the second power generation module and the working state of each battery pack in the second power generation module may include:

[0169] In the grid-connected scenario, based on the backup power demand and the charge and discharge status of the energy storage system, the working status of each second power generation module and / or the working status of each battery pack is controlled;

[0170] In an off-grid scenario, the working state of each second power generation module and / or the working state of each battery pack is controlled based on the load power of the power generation system.

[0171] In this embodiment, the charge and discharge state includes a charging state or a discharging state.

[0172] In the grid-connected scenario, the power generation status of the power generation module, the backup power demand and the charging and discharging status of the energy storage system can be combined to control the power generation module to enter the corresponding working state under different circumstances.

[0173] like Figure 2 As shown, in some embodiments, in a grid-connected scenario, based on the backup power demand and the charge and discharge state of the energy storage system, controlling the working state of each second power generation module and / or the working state of each battery pack may include:

[0174] Based on the charge and discharge status, obtain the target judgment condition;

[0175] Based on the target judgment condition, the charging and discharging status and the backup power demand, the working status of each second power generation module and / or the working status of each battery pack is controlled.

[0176] In this embodiment,

[0177] The target judgment condition is used to determine whether the conditions for executing the loss reduction strategy are met.

[0178] Among them, the loss reduction strategy may 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 a corresponding working state.

[0179] like Figure 3 As shown, the multiple loss reduction strategies may 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.

[0180] The target judgment condition can be adjusted accordingly based on the charge and discharge status.

[0181] It can be understood that, when it is determined based on the target judgment condition that the loss reduction strategy is executed, one or more second power generation modules in the power generation system can be controlled to enter an energy-saving state.

[0182] When it is determined based on the target judgment condition that the loss reduction strategy is not executed, each second power generation module can be maintained in a normal working state, or it can be further determined on this basis in combination with other working parameters whether the loss reduction strategy can be executed.

[0183] In some embodiments, when it is determined based on the target judgment conditions that the loss reduction strategy is not executed, some of the second power generation modules (such as two) can be maintained loaded, and the second power generation modules that are not at full power can be controlled by single battery packs.

[0184] Under different loss reduction strategies, the corresponding working modes of the components entering the energy-saving state may also be different.

[0185] In the grid-connected scenario, for each second power generation module included in the power generation system, the target judgment condition can be obtained according to the current charge and discharge status 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. When 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 charge and discharge status and the backup power demand.

[0186] In an off-grid scenario, the working state of the second power generation module and the working state of the battery pack can be adjusted based on the load power of the power generation system. When the working state of the battery pack changes, the working state of the second power generation module to which it belongs will also change accordingly.

[0187] The following is an explanation of how to determine the target judgment conditions.

[0188] In some embodiments, obtaining a target judgment condition based on the charge and discharge state may include:

[0189] Performing a weighted summation on the charge states of each energy storage system to obtain a first total charge value;

[0190] When the charge-discharge state is the charging state, determining the target judgment condition is that the first total charge value is not less than the first charge threshold value;

[0191] When the charge and discharge state is the discharge state, the target judgment condition is determined as 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.

[0192] In this embodiment, the first charge threshold may include: a charge threshold or a value close to the charge threshold, or may be user-defined.

[0193] The second charge threshold may include: a discharge threshold or a value relatively close to the discharge threshold, or may be user-defined.

[0194] The first total charge value is the overall remaining SOC of the multiple energy storage systems included in the power generation system. Figure 3 As shown, in the actual implementation process, the overall remaining SOC of a single energy storage system may be calculated first, and then the overall remaining SOCs of each energy storage system may be weighted summed to obtain a first total charge value.

[0195] Calculating the overall remaining SOC of a single energy storage system may include weighted summing of the remaining SOCs of each battery pack in the same energy storage system; Figure 3 The SOC1, SOC2, ..., SOCN included in the power generation module 1 shown are weighted summed to obtain the overall remaining SOC of the power generation module 1, and then the overall remaining SOC corresponding to the power generation module 1 to the power generation module N are weighted summed to obtain the first total charge value.

[0196] In the charging state, when the first total charge value is less than the first charge threshold, it is considered that the current charging is normal and the current working parameters can be maintained unchanged; when 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 or has been exceeded, and charging should be stopped. This situation confirms that the target judgment conditions are met, and it can be considered whether to control the relevant power generation modules to enter the energy-saving state.

[0197] 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 or has been exceeded, and the discharge should be stopped. This situation confirms that the target judgment conditions are met, and it can be considered whether to control the relevant power generation modules to enter the energy-saving state.

[0198] In some embodiments, in the discharge state, it is also possible to determine whether to enter the energy-saving state based on the size of the load power corresponding to the power generation system.

[0199] The second threshold is a critical value for determining whether the current load is a light load, and the specific value of the second threshold can be customized by the user.

[0200] Continue to refer Figure 2 When the load power is not greater than the second threshold, it can be approximately considered that the current load is light; when 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 approximately considered that the basic power supply demand can be met without the energy storage system, and it can also be considered that the target judgment condition is met, and whether to control the relevant power generation module to enter the energy-saving state can be considered.

[0201] The following describes the corresponding loss reduction strategies in various scenarios.

[0202] 1. Control logic for grid-connected and no backup power demand

[0203] In some embodiments, based on the target judgment condition, the charging and discharging state, and the backup power demand, controlling the working state of each second power generation module and / or the working state of each battery pack may include:

[0204] When there is no backup power demand and the target judgment condition is met, controlling each second power generation module to enter the first energy-saving state;

[0205] When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is the discharge state, controlling at least part of the second power generation module to enter the first energy-saving state;

[0206] When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is the charging state, each second power generation module is controlled to maintain a normal working state.

[0207] In this embodiment, continue to refer to Figure 2 , when there is no backup power demand when connected to the grid (i.e., grid-connected operation and non-backup power scenario), for the charging status, 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.

[0208] In the case of grid-connected power without backup power demand, for the discharge state, when 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 second power generation modules of the power generation system are controlled to enter the first energy-saving state, that is, all inverters of the second power generation modules are controlled to shut down, and / or all battery packs of the second power generation modules are controlled to shut down.

[0209] When there is no backup power demand for grid connection and the target judgment conditions are not met, it is possible to further determine whether the loss reduction strategy can be implemented based on the charging and discharging status.

[0210] In the charging state, when it is determined that there is no backup power demand for grid connection and the target judgment conditions are not met, the loss reduction strategy is not executed and the power generation system is controlled to maintain a normal working state.

[0211] In the discharge state, when it is determined that there is no backup power demand for grid connection and the target judgment conditions are not met, part of the second power generation modules can be controlled to enter the first energy-saving state, and another part of the second power generation modules can be controlled to maintain a normal working state.

[0212] For example, one or two of the plurality of second power generation modules may be controlled to enter the first energy-saving state, and the remaining second power generation modules may be controlled to maintain a normal working state.

[0213] Continue to refer Figure 2 In some embodiments, when there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is the discharge state, controlling at least part of the second power generation module to enter the first energy-saving state may include:

[0214] Based on the load power corresponding to the power generation system, determine the first target power generation module 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;

[0215] The first target power generation module is controlled to enter a normal working state, and the remaining second power generation modules except the first target power generation module among all the second power generation modules are controlled to enter a first energy-saving state.

[0216] In this embodiment, the first target power generation module is a power generation module used to maintain a normal working state.

[0217] The first target power generation module may be one or more of all 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 to maintain normal power demand.

[0218] The load power corresponding to the power generation module is used to characterize the load capacity of the power generation module.

[0219] The load power corresponding to 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.

[0220] The first target output power may be a value close to the maximum output power of the power generation module, and the first target output power may be user-defined, which is not limited in this application. In some embodiments, the relationship between the sum of the load power of the first power generation module and the load power may be preferentially calculated.

[0221] When the sum of the load powers of the first power generation modules is not less than the load power, the number of the first target power generation modules may be 0, that is, all the second power generation modules are controlled to enter the first energy-saving state.

[0222] In the case where the sum of the load powers of the first power generation modules is less than the load power, the number of second power generation modules that need to maintain a normal working state can be selected from the second power generation modules.

[0223] For example, during the actual execution process, the load power corresponding to each second power generation module can be obtained respectively, 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, and the second power generation module corresponding to the accumulated value is determined as the first target power generation module, the first target power generation module is controlled to maintain a normal working state, and 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 modules to shut down, and / or controlling the battery pack inside the remaining second power generation modules to shut down, etc.

[0224] The specific accumulation process will be described in the following embodiments and will not be elaborated here.

[0225] 2. Control logic for grid-connected power supply with backup power demand

[0226] In some embodiments, based on the target judgment condition, the charging and discharging state, and the backup power demand, controlling the working state of each second power generation module and / or the working state of each battery pack may include:

[0227] When there is a demand for backup power and the target judgment conditions are met, controlling each second power generation module to enter a second energy-saving state;

[0228] When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter a second energy-saving state;

[0229] When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is the charging state, each second power generation module is controlled to maintain a normal working state.

[0230] In this embodiment, the method for obtaining the target judgment condition and the method for determining whether the target judgment condition is met when the grid is connected with a backup power demand and when the grid is connected without a backup power demand are the same, which have been described in the above embodiments and will not be repeated here.

[0231] Continue to refer Figure 2 In the case of grid-connected backup power demand, 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 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 maintain power supply.

[0232] When there is a need for backup power when connected to the grid, for the discharge state, when 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.

[0233] When there is a need for backup power when connected to the grid and the target judgment conditions are not met, it is possible to further determine whether the loss reduction strategy can be implemented based on the charging and discharging status.

[0234] In the charging state, when it is determined that the grid has a backup power demand and the target judgment conditions are not met, the loss reduction strategy is not executed and the power generation system is controlled to maintain a normal working state.

[0235] Continue to refer Figure 2 In the discharge state, when it is determined that the grid has a backup power demand and does not meet the target judgment conditions, part of the second power generation modules can be controlled to enter the second energy-saving state, and another part of the second power generation modules can be controlled to maintain a normal working state.

[0236] For example, one or two of the plurality of second power generation modules may be controlled to enter the second energy-saving state, and the remaining second power generation modules may be controlled to maintain a normal working state.

[0237] Continue to refer Figure 2 In some embodiments, when there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is the discharge state, controlling at least part of the second power generation module to enter the second energy-saving state may include:

[0238] Based on the load power corresponding to the power generation system, determine the second target power generation module 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;

[0239] The second target power generation module is controlled to enter a normal working state, and the remaining second power generation modules except the second target power generation module among all the second power generation modules are controlled to enter a second energy-saving state.

[0240] In this embodiment, the second target power generation module is a power generation module used to maintain a normal working state.

[0241] The second target power generation module can be one or more power generation modules among all the 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 to maintain normal power demand.

[0242] In some embodiments, the relationship between the sum of the load powers of the first power generation modules and the load power may be preferentially calculated.

[0243] When the sum of the load powers of the first power generation modules is not less than the load power, the number of the second target power generation modules may be 0, that is, all the second power generation modules are controlled to enter the second energy-saving state.

[0244] In the case where the sum of the load powers of the first power generation modules is less than the load power, the number of second power generation modules that need to maintain a normal working state can be selected from the second power generation modules.

[0245] For example, in the actual execution process, the load power corresponding to each second power generation module can be obtained respectively, 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, and the power generation module corresponding to the accumulated value is determined as the second target power generation module, the second target power generation module is controlled to maintain a normal working state, and the remaining second power generation modules are controlled to enter the second energy-saving state, such as controlling the power modules of the inverters inside the remaining second power generation modules to have no switching action or to operate based on the target frequency, and controlling the control units of the battery packs in the remaining power generation modules to maintain power supply, etc.

[0246] The specific accumulation process is similar to the accumulation method corresponding to the first target power generation module, and will not be described in detail here.

[0247] 3. Control Logic in Off-Grid Scenarios

[0248] In some embodiments, in an off-grid scenario, based on the load power of the power generation system, controlling the working state of each second power generation module and / or the working state of each battery pack may include:

[0249] 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.

[0250] In this embodiment, in an off-grid scenario, there is no need to consider the charging and discharging status and the backup power demand, and whether to execute the loss reduction strategy can be determined based on the load power corresponding to the power generation system.

[0251] Among them, the loss reduction strategy includes at least one of loss reduction strategy 3 (i.e., the whole machine loss reduction strategy) and loss reduction strategy 4 (i.e., the single battery pack loss reduction strategy).

[0252] The third target power generation module is a second power generation module for entering a second energy-saving state.

[0253] The number of the third target power generation module may be one or more.

[0254] During the actual implementation process, at least one power generation module should be kept in normal working condition to maintain basic power supply.

[0255] In some embodiments, based on the load power corresponding to the power generation system, controlling the third target power generation module in each second power generation module to enter the second energy-saving state may include:

[0256] Accumulate 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, determine the second power generation module corresponding to the accumulated value as the fourth target power generation module, and determine the remaining second power generation modules in the second power generation module except the fourth target power generation module as the third target power generation module;

[0257] The fourth target power generation module is controlled to maintain a normal working state, and the third target power generation module is controlled to enter a second energy-saving state.

[0258] In this embodiment, the fourth target power generation module is the remaining second power generation modules among all the second power generation modules except the third target power generation module.

[0259] In some embodiments, the number of the fourth target power generation module may be at least one to maintain basic power supply.

[0260] During the actual execution process, the load power corresponding to each second power generation module can be obtained respectively, 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, and 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 a normal working state, and the remaining second power generation modules, that is, the third target power generation module is controlled to enter the second energy-saving state, such as controlling the power module of the inverter inside the third target 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 in the remaining power generation modules to keep power supply, etc.

[0261] During the accumulation process, random accumulation or accumulation in a preset order may be adopted.

[0262] In some embodiments, in an off-grid scenario, controlling the working state of each second power generation module and / or the working state of each battery pack based on the load power of the power generation system may include:

[0263] Based on the load power corresponding to each battery pack in the second power generation module which maintains the normal working state, the working state of each battery pack in the second power generation module which maintains the normal working state is controlled.

[0264] In this embodiment, the load power corresponding to the battery pack is used to characterize the load capacity of the battery pack.

[0265] The load power corresponding to 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.

[0266] The second target output power may be a value that is relatively close to the maximum output power of the battery pack. The second target output power may be user-defined and is not limited in this application.

[0267] During the actual implementation process, in addition to controlling the working state of the entire power generation module according to the overall load power of the second power generation module, the working state of each battery pack in the power generation module can also be individually controlled based on the load power corresponding to each battery pack included in the second power generation module.

[0268] In some embodiments, based on the load power corresponding to each battery pack in the second power generation module that maintains a normal working state, controlling the working state of each battery pack in the second power generation module in a normal working state may include:

[0269] A first target battery pack in the battery pack is controlled to enter a second energy-saving state, and a second target battery pack in the battery pack other than the first target battery pack is controlled to maintain a normal working state.

[0270] In this embodiment, the number of the second power generation modules maintaining a normal working state may be one or more.

[0271] The first target battery pack is a battery pack used to enter the second energy-saving state.

[0272] The number of the first target battery packs may be one or more.

[0273] When all battery packs included in the same second power generation module enter the second energy-saving state, it can be approximately considered that the second power generation module enters the second energy-saving state.

[0274] The second target battery pack is the remaining battery packs among all the battery packs except the first target battery pack.

[0275] 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 in the battery pack other than the first target battery pack to maintain a normal working state may include:

[0276] Accumulate 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, determine the battery pack corresponding to the accumulated value as the second target battery pack, and determine the remaining battery packs in the battery pack except the second target battery pack as the first target battery pack;

[0277] The second target battery pack is controlled to maintain a normal working state, and the first target battery pack is controlled to enter a second energy-saving state.

[0278] In this embodiment, the second target battery pack is determined in a similar manner to the fourth target power generation module.

[0279] For example, the accumulation may be performed randomly or in a preset order.

[0280] In some embodiments, the number of the second target battery pack may be at least one.

[0281] During the actual execution process, the load power corresponding to each battery pack in the second power generation module can be obtained respectively, 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, and 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 a normal working state, and the remaining battery packs, that is, the first target battery pack, are controlled to enter the second energy-saving state, such as controlling the power module of the inverter corresponding to the first target battery pack to have no switching action or to operate based on the target frequency, and controlling the control unit of the first target battery pack to keep power supply, etc.

[0282] According to the control method of the power generation system provided in the embodiment of the present application, in an off-grid scenario, based on the load power of the power generation module and / or the battery pack and the load power corresponding to the power generation system, the working state of the power generation module can be controlled as a whole, and the working state of the battery pack can be controlled individually, so as to control non-essential components to enter an energy-saving state while meeting the load demand, reduce ineffective losses, and reduce electricity costs, and has high control flexibility and universality.

[0283] In some embodiments, overall control of the second power generation module and individual control of the battery pack can be performed independently of each other, such as: part 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 second power generation modules can be controlled to enter the second energy-saving state; or part of the second power generation modules can be controlled to enter the second energy-saving state, while part of the battery packs in another part of the second power generation modules can be controlled to enter the second energy-saving state.

[0284] In some embodiments, the second power generation module can be first controlled as a whole to control part of the second power generation module to enter the second energy-saving state, and then the remaining second power generation modules that maintain a normal working state can be individually controlled based on the battery pack to control part of the battery pack to enter the second energy-saving state.

[0285] The number of the remaining power generation modules that maintain a normal working state may be one or more.

[0286] Continue to refer Figure 2 In some embodiments, in an off-grid scenario, controlling the working state of each second power generation module and / or the working state of each battery pack based on the load power of the power generation system may include:

[0287] Obtaining the state of charge of each second power generation module;

[0288] Control the second power generation module whose state of charge is not greater than the second charge threshold to enter the second energy-saving state, and control the second power generation module whose state of charge is greater than the second charge threshold to enter the normal working state;

[0289] Based on the load power corresponding to the power generation system, controlling the third target power generation module in the second power generation module whose state of charge is greater than the second charge threshold to enter the second energy-saving state;

[0290] When the number of the second power generation modules maintaining normal working state is 1, the working state of each battery pack in the second power generation module maintaining normal working state is controlled based on the load power of each battery pack in the second power generation module maintaining normal working state.

[0291] In this embodiment, the second charge threshold may include: a discharge threshold or a value relatively close to the discharge threshold, or may be user-defined.

[0292] The state of charge is not greater than the second charge threshold, indicating that the load power of the power generation module corresponding to the state of charge is low, or even zero.

[0293] For example, for the second power generation module corresponding to the charge state not greater than the second charge threshold, the load power corresponding to the second power generation module can be set to 0; for the second power generation module corresponding to the charge state greater than the second charge threshold, the actual load power corresponding to the second power generation module can be obtained.

[0294] In actual implementation, the charge state of each second power generation module can be obtained respectively and compared with the second charge threshold value to control the second power generation module with lower load power to enter the second energy-saving state first.

[0295] For the remaining second power generation modules, that is, the second power generation modules whose charge state is greater than the second charge threshold, further combined with their corresponding load power and the load power corresponding to the power generation system, the third target power generation module is selected to enter the second energy-saving state, and the remaining fourth target power generation modules temporarily maintain normal working state.

[0296] The method for determining the third target power generation module will be described in the following embodiments and will not be elaborated here.

[0297] It should be noted that, in this embodiment, the number of the fourth target power generation module maintaining a normal working state should be at least one.

[0298] For the fourth target power generation module, the working state of each battery pack in all the battery packs included in the fourth target power generation module can be individually controlled in combination with 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.

[0299] It should be noted that, in some embodiments, the number of the second target battery packs maintaining a normal working state should be at least one, so as to ensure that there is at least one normally working battery pack in the power generation system to provide basic power supply requirements.

[0300] The following description is made by taking the example that the first operating parameter includes the photovoltaic voltage.

[0301] In the actual execution process, 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 to determine in turn whether the charge state of each second power generation module is greater than the second charge threshold, and it is determined that the charge state of N second power generation modules is greater than the second charge threshold, and the charge state of the remaining Q second power generation modules is not greater than the second charge threshold.

[0302] Control the above Q second power generation modules to enter the second energy-saving state, such as controlling the power modules of the inverter and battery pack inside the 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 remain powered.

[0303] The above N second power generation modules are controlled to maintain a normal working state.

[0304] Then, based on the corresponding carrying power and load power of each of the N second power generation modules, M second power generation modules are selected from the N power generation modules to control the M second power generation modules (i.e., the fourth target power generation modules) to continue to maintain a normal working state, while ensuring that the sum of the carrying capacity of the M second power generation modules and the carrying power of the first power generation module is not less than the load power so that it can support the current load.

[0305] Control the other (NM) second power generation modules (i.e., the third target power generation modules) to enter the second energy-saving state, such as controlling the power modules of the inverter and the battery pack inside the (NM) second power generation modules to have no switching action or these power modules operate at a frequency lower than the switching frequency during normal operation, and the control units of these battery packs remain powered.

[0306] Among them, Q, M and N are all integers, Q≥0, N≥1, M≥1 and N≥M.

[0307] When there is only one second power generation module left in the power generation system and in normal working condition, each battery pack inside the second power generation module in normal working condition is used as a control unit to determine in turn whether the charge state of each battery pack inside is greater than the second charge threshold, and determine that the charge state of J battery packs is greater than the second charge threshold, and the charge state of the remaining O battery packs is not greater than the second charge threshold.

[0308] Control the above O battery packs to enter the second energy-saving state, such as controlling the power modules of the O 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 remain powered.

[0309] Control the above J battery packs to maintain normal working status.

[0310] Then, based on the corresponding carrying power and load power of each battery pack in these J battery packs, K battery packs are taken from these J battery packs to control these K battery packs (i.e., the second target power generation module) to continue to maintain normal working state, while ensuring that the sum of the carrying capacity of these K battery packs and the carrying power of the first power generation module is not less than the load power so that it can support the current load.

[0311] 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 remain powered; wherein O, J and K are all integers, O≥0, J≥1, K≥1 and J≥K.

[0312] According to the control method of the power generation system provided in the embodiment of the present application, through the multi-level control principle of overall control first and then individual control, the corresponding components are controlled step by step to enter the second energy-saving state. On the basis of meeting the load demand, as many power generation modules and / or battery packs as possible can enter the energy-saving state, further reducing invalid consumption, reducing electricity costs, and having higher processing efficiency.

[0313] The accumulation method of the power generation module is described below.

[0314] In some embodiments, 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 determining the second power generation module corresponding to the accumulated value as the fourth target power generation module may include:

[0315] Obtaining the load power corresponding to each second power generation module and the charge state of each second power generation module;

[0316] Based on the order of the charge states, the load powers of the second power generation modules corresponding to the charge states are accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

[0317] In this embodiment, the load power corresponding to each second power generation module in the power generation system and the charge state of each second power generation module may be obtained first.

[0318] Based on the size of the state of charge, each second power generation module is sorted in descending order, and the load power of the second power generation modules is accumulated in sequence from front to back. Each time a load power is accumulated, the sum of the current accumulated value and the load power of the first power generation module is compared with the load power until the sum is not less than the load power. If it is considered that all the second power generation modules corresponding to the current accumulated value and the first power generation module can jointly 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 modules to control the fourth target power generation module to maintain a normal working state.

[0319] In some embodiments, 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 determining the second power generation module corresponding to the accumulated value as the fourth target power generation module may include:

[0320] Obtain the load power corresponding to each power generation module;

[0321] Based on the order of the load power, the load power is accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

[0322] In this embodiment, the load power corresponding to each second power generation module in the power generation system may be obtained first.

[0323] Then, based on the size of the load power, the second power generation modules are sorted in descending order, and the load powers of the second power generation modules are accumulated in sequence from front to back. Each time a load power is accumulated, the sum of the load powers of the first power generation modules currently obtained as the accumulated value is compared with the load power until the sum is not less than the load power. It is considered that all the second power generation modules corresponding to the current accumulated value can meet the load demand together with the first power generation module, and all the second power generation modules corresponding to the current accumulated value are determined as the fourth target power generation modules to control the fourth target power generation modules to maintain normal working state.

[0324] According to the control method of the power generation system provided in the embodiment of the present application, the load power is accumulated by utilizing the size of the load power or the level of the charge state, so that all the second power generation modules whose accumulated value is not less than the load power are determined as the fourth target power generation modules, so as to control the fourth target power generation modules to maintain normal working state 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, thereby further reducing invalid consumption, reducing electricity costs, and thus improving user experience.

[0325] In some embodiments, 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 determining the second power generation module corresponding to the accumulated value as the fourth target power generation module may include:

[0326] Based on the identification order corresponding to each second power generation module, the load powers corresponding to each identified second power generation module are accumulated in sequence 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

[0327] In this embodiment, the identification order is the order in which the second power generation modules are identified.

[0328] Based on the identification order, the load power corresponding to each identified second power generation module is obtained, and 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 module, and 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 continuously 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, and 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 a normal working state.

[0329] According to the control method of the power generation system provided in the embodiment of the present application, a plurality of accumulation methods are provided to determine the power generation modules that need to be controlled to maintain a normal working state, which has high flexibility.

[0330] The following is an explanation of the method of accumulating battery packs.

[0331] In some embodiments, 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 may include:

[0332] Obtain the load power corresponding to each battery pack and the charge state of each battery pack;

[0333] Based on the order of the state of charge, the load powers of the battery packs corresponding to the state of charge are accumulated from large to small 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.

[0334] In this embodiment, the load power corresponding to each battery pack and the charge state of each battery pack may be obtained first.

[0335] The battery packs are sorted in descending order based on the state of charge, and the load powers of the battery packs are accumulated in sequence from front to back. Each time a load power is accumulated, the sum of the current accumulated value and the load power of the first power generation module is compared with the load power until the sum is no less than the load power. If it is considered that all the battery packs corresponding to the current accumulated value can meet the load demand, all the battery packs corresponding to the current accumulated value are determined as the second target battery packs to control the second target battery packs to maintain a normal working state.

[0336] In some embodiments, 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 may include:

[0337] Get the load power corresponding to each battery pack;

[0338] Based on the order of the load power, the load power is accumulated from large to small 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.

[0339] In this embodiment, the load power corresponding to each battery pack may be obtained first.

[0340] Then, the battery packs are sorted in descending order based on the size of the load power, and the load power of the battery packs is accumulated sequentially from front to back. Each time a load power is accumulated, the sum of the current accumulated value and the load power of the first power generation module is compared with the load power, 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, and it is considered that all the battery packs corresponding to the current accumulated value can meet the load demand, then all the battery packs corresponding to the current accumulated value are determined as the second target battery packs, so as to control the second target battery packs to maintain a normal working state.

[0341] Of course, in other embodiments, accumulation can also be performed by identifying the order, which is not elaborated in this application.

[0342] According to the control method of the power generation system provided in the embodiment of the present application, the load power is accumulated by utilizing the size of the load power or the level of the charge state, so that all battery packs whose accumulated value is not less than the load power are determined as the second target battery packs, so as to control the second target battery packs to maintain normal working state 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, thereby further reducing invalid consumption, reducing electricity costs, and thus improving user experience.

[0343] It is understandable that after controlling the second power generation module and / or the battery pack to enter the corresponding energy-saving state, it can also be controlled to exit the energy-saving state and enter a normal working state according to a certain control logic.

[0344] For example, in some embodiments, after the system is restarted, it can directly enter a normal working state.

[0345] Alternatively, the corresponding components may be controlled to exit the energy-saving state according to changes in the first operating parameter of the photovoltaic system, changes in the load power corresponding to the power generation system, and other factors.

[0346] The control logic for exiting the energy-saving state is explained below from different perspectives.

[0347] First, control according to the changes in the output electrical signal of the inverter

[0348] In some embodiments, step 120 may include:

[0349] In a case where at least one of the power generation module and the battery pack is controlled not to be in a normal working state, determining a target comparison value based on a frequency and an amplitude of an output voltage of the inverter;

[0350] When the target comparison value is within a preset abnormal interval, at least one of the power generation modules that are not in a normal working state and / or at least one of the battery packs are controlled to enter a normal working state.

[0351] In this embodiment, not being in the normal working state may include being in the second energy-saving state.

[0352] The target comparison value may be an output value of a certain characteristic function with the frequency and amplitude of the output voltage of the inverter as independent variables.

[0353] The characteristic function can be customized by the user or set based on historical data.

[0354] The preset abnormal interval is a range of intervals used to characterize abnormalities of the target comparison value, and the preset abnormal interval can be customized based on the user.

[0355] It can be understood that when the target comparison value is not within the preset abnormal interval, the target comparison value can be approximately considered normal;

[0356] When the target comparison value is in a preset abnormal interval (including upper and lower thresholds of the interval), the target comparison value is considered to be abnormal, and thus the output electrical signal of the inverter is approximately considered to be abnormal.

[0357] When it is determined that the output electrical signal of the inverter is abnormal, 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 to ensure that the sum of the load powers of all 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 power supply continuity.

[0358] The following description is made by taking a power generation system including a power generation modules as an example, where a is a positive integer.

[0359] For example, in a grid-connected scenario with a backup power demand and 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, one or more of the b second power generation modules are controlled to exit the second energy-saving state and enter a normal working state; wherein b≥0, and b is an integer.

[0360] For another example, in a scenario where there is a need for backup power when connected to the grid and the power supply 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, one or more of the c second power generation modules are controlled to exit the second energy-saving state and enter a normal working state; wherein c ≥ 0, and c is an integer.

[0361] For another 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 output electrical signal of the inverter, one or more of the d second power generation modules and / or one or more of the e battery packs are controlled to exit the second energy-saving state and enter a normal working state; wherein d≥0, e≥0, and d and e are both integers.

[0362] It should be noted that in the actual implementation process, 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 show 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 basis for judgment. When it is identified that the function output is in the abnormal range, the relevant energy units are controlled to quickly output power and exit the loss-reducing state to ensure the continuity of power supply to the load. It can control the redundant energy units to enter the loss-reducing state when the load is stable, and ensure the continuity of backup power when the load suddenly increases in the off-grid energy-saving state.

[0363] According to the control method of the power generation system provided in the embodiment of the present 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, so that the system can output stable AC power with a faster response speed, ensure the continuity of off-grid backup power, and effectively ensure the normal and stable operation of the power generation system.

[0364] Second, control according to the change of load power corresponding to the power generation system

[0365] In some embodiments, step 120 may include:

[0366] In the discharge state and after controlling at least one of the power generation modules to be not in the normal working state, when the sum of the load powers corresponding to the power generation modules in the normal working state is less than the load power corresponding to the power generation system, at least some of the power generation modules among all the power generation modules that are not in the normal working state are controlled to enter the normal working state, so that the sum of the load powers corresponding to the power generation modules in the normal working state is not less than the load power.

[0367] In this embodiment, not being in the normal working state may include being in the first energy-saving state or the second energy-saving state.

[0368] The following continues to explain by taking the power generation system including a second power generation module as an example.

[0369] For example, in a grid-connected scenario with no backup power demand and 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 increases to a value that exceeds the sum of the accumulated value of the load powers corresponding to (af) second power generation modules and the load powers corresponding to all first power generation modules, it is necessary to wake up a sufficient number of second power generation modules from the f second power generation modules to support the current load power, ensuring that the sum of the load capacities corresponding to all normally operating power generation modules is sufficient to support the current load power. The specific accumulation method has been described in the above embodiment and will not be repeated here; wherein f is a positive integer and f≤a.

[0370] For another example, in a grid-connected scenario with a backup power demand and 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 increases to a value that exceeds the sum of the accumulated value of the load powers corresponding to (ag) power generation modules and the sum of the load powers corresponding to all first power generation modules, it is necessary to wake up a sufficient number of second power generation modules from the g second power generation modules to support the current load power, ensuring that the sum of the load capacities 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.

[0371] According to the control method of the power generation system provided in the embodiment of the present application, the components in the power generation system are controlled to exit the energy-saving state according to the changes in the load power corresponding to the power generation system. Flexible adjustments can be made based on changes in actual power demand, while saving energy and reducing losses, meeting power demand, ensuring stable operation of the power generation system, and improving user experience.

[0372] Third, control according to the change of the first working parameter of the photovoltaic system

[0373] In some embodiments, step 120 may include:

[0374] When the first operating parameter of the photovoltaic system in the non-pure storage type power generation module is greater than the first threshold and the power generation module with the first operating parameter greater than the first threshold is not in a normal working state, the power generation module with the first operating parameter greater than the first threshold 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 a normal working state.

[0375] In this embodiment, not being in the normal working state may include being in the first energy-saving state or the second energy-saving state.

[0376] Regardless of whether it is a grid-connected scenario with no backup power demand, a grid-connected scenario with backup power demand, or an off-grid scenario; regardless of the charging and discharging state; regardless of 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, etc., in any scenario, when the loss reduction strategy is executed, the second power generation module is controlled to enter the first energy-saving state or the second energy-saving state, or the battery pack is controlled to enter the second energy-saving state, in the subsequent operation process, when 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, 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.

[0377] According to the control method of the power generation system provided in the embodiment of the present application, the working states of the components in the power generation system are controlled according to the changes in the first working parameters of the photovoltaic system. When one or more photovoltaic systems are generating electricity normally, at least one of the power generation modules and / or at least one of the battery packs that are not in normal working state are controlled to enter normal working state, thereby reducing the amount of abandoned light and improving the utilization rate of light energy.

[0378] The control method of the power generation system provided in the embodiment of the present application can be executed by a control device of the power generation system. In the embodiment of the present application, the control device of the power generation system executing the control method of the power generation system is taken as an example to illustrate the control device of the power generation system provided in the embodiment of the present application.

[0379] An embodiment of the present application also provides a control device for a power generation system.

[0380] 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.

[0381] like Figure 4 As shown, the control device of the power generation system includes: a first processing module 410 and a second processing module 420 .

[0382] 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 demand of the power generation system; the working scenario includes an off-grid scenario or a grid-connected scenario; the category includes a pure storage category or a non-pure storage category, and the power generation system of the non-pure storage category also includes a photovoltaic system;

[0383] 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 the category, working scenario and backup power demand; the working state includes: a first energy-saving state, a second energy-saving state or a normal working state.

[0384] According to the control device of the power generation system provided in the embodiment of the present application, the working state of the power generation module and the battery pack is adjusted by combining the off-grid scenario and the presence or absence of backup power demand. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery is used for standby loss of its own equipment. Energy consumption is saved, electricity costs are significantly reduced, and user experience is improved.

[0385] In some embodiments, the second processing module 420 may also be used to:

[0386] Acquire a first operating parameter of a photovoltaic system in a non-pure storage type power generation module;

[0387] Determine a non-pure storage type power generation module whose first operating parameter is greater than a first threshold as a first power generation module, and determine the remaining power generation modules among all the power generation modules except the first power generation module as second power generation modules;

[0388] Based on the working scenario and the backup power demand, the working state of the second power generation module and at least one of the working states of each battery pack in the second power generation module are controlled.

[0389] In some embodiments, the second processing module 420 may also be used to:

[0390] Based on the working scenario and the backup power requirement, controlling at least one of the working state of the second power generation module and the working state of each battery pack in the second power generation module includes:

[0391] In the grid-connected scenario, based on the backup power demand and the charge and discharge status of the energy storage system, the working status of each second power generation module and / or the working status of each battery pack is controlled;

[0392] In an off-grid scenario, the working state of each second power generation module and / or the working state of each battery pack is controlled based on the load power of the power generation system.

[0393] In some embodiments, the second processing module 420 may also be used to:

[0394] Based on the charge and discharge status, obtain the target judgment condition;

[0395] Based on the target judgment condition, the charging and discharging status and the backup power demand, the working status of each second power generation module and / or the working status of each battery pack is controlled.

[0396] In some embodiments, the second processing module 420 may also be used to:

[0397] When there is no backup power demand and the target judgment condition is met, controlling each second power generation module to enter the first energy-saving state;

[0398] When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is the discharge state, controlling at least part of the second power generation module to enter the first energy-saving state;

[0399] When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is the charging state, each second power generation module is controlled to maintain a normal working state.

[0400] In some embodiments, the second processing module 420 may also be used to:

[0401] Based on the load power corresponding to the power generation system, determine the first target power generation module 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;

[0402] The first target power generation module is controlled to enter a normal working state, and the remaining second power generation modules except the first target power generation module among all the second power generation modules are controlled to enter a first energy-saving state.

[0403] In some embodiments, the second processing module 420 may also be used to:

[0404] When there is a demand for backup power and the target judgment conditions are met, controlling each second power generation module to enter a second energy-saving state;

[0405] When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter a second energy-saving state;

[0406] When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is the charging state, each second power generation module is controlled to maintain a normal working state.

[0407] In some embodiments, the second processing module 420 may also be used to:

[0408] Based on the load power corresponding to the power generation system, determine the second target power generation module 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;

[0409] The second target power generation module is controlled to enter a normal working state, and the remaining second power generation modules except the second target power generation module among all the second power generation modules are controlled to enter a second energy-saving state.

[0410] In some embodiments, the second processing module 420 may also be used to:

[0411] Performing a weighted summation on the charge states of each energy storage system to obtain a first total charge value;

[0412] When the charge-discharge state is the charging state, determining the target judgment condition is that the first total charge value is not less than the first charge threshold value;

[0413] When the charge and discharge state is the discharge state, the target judgment condition is determined as 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.

[0414] In some embodiments, the second processing module 420 may also be used to:

[0415] 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.

[0416] In some embodiments, the second processing module 420 may also be used to:

[0417] Accumulate 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, determine the second power generation module corresponding to the accumulated value as the fourth target power generation module, and determine the remaining second power generation modules in the second power generation module except the fourth target power generation module as the third target power generation module;

[0418] The fourth target power generation module is controlled to maintain a normal working state, and the third target power generation module is controlled to enter a second energy-saving state.

[0419] In some embodiments, the second processing module 420 may also be used to:

[0420] Obtaining the load power corresponding to each second power generation module and the charge state of each second power generation module;

[0421] Based on the order of the charge states, the load powers of the second power generation modules corresponding to the charge states are accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

[0422] In some embodiments, the second processing module 420 may also be used to:

[0423] Obtain the load power corresponding to each power generation module;

[0424] Based on the order of the load power, the load power is accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

[0425] In some embodiments, the second processing module 420 may also be used to:

[0426] Based on the load power corresponding to each battery pack in the second power generation module which maintains the normal working state, the working state of each battery pack in the second power generation module which maintains the normal working state is controlled.

[0427] In some embodiments, the second processing module 420 may also be used to:

[0428] A first target battery pack in the battery pack is controlled to enter a second energy-saving state, and a second target battery pack in the battery pack other than the first target battery pack is controlled to maintain a normal working state.

[0429] In some embodiments, the second processing module 420 may also be used to:

[0430] Accumulate 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, determine the battery pack corresponding to the accumulated value as the second target battery pack, and determine the remaining battery packs in the battery pack except the second target battery pack as the first target battery pack;

[0431] The second target battery pack is controlled to maintain a normal working state, and the first target battery pack is controlled to enter a second energy-saving state; the number of the second target battery pack is at least one.

[0432] In some embodiments, the second processing module 420 may also be used to:

[0433] Obtain the load power corresponding to each battery pack and the charge state of each battery pack;

[0434] Based on the order of the state of charge, the load powers of the battery packs corresponding to the state of charge are accumulated from large to small 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.

[0435] In some embodiments, the second processing module 420 may also be used to:

[0436] Get the load power corresponding to each battery pack;

[0437] Based on the order of the load power, the load power is accumulated from large to small 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.

[0438] In some embodiments, the second processing module 420 may also be used to:

[0439] Obtaining the state of charge of each second power generation module;

[0440] Control the second power generation module whose state of charge is not greater than the second charge threshold to enter the second energy-saving state, and control the second power generation module whose state of charge is greater than the second charge threshold to enter the normal working state;

[0441] Based on the load power corresponding to the power generation system, controlling the third target power generation module in the second power generation module whose state of charge is greater than the second charge threshold to enter the second energy-saving state;

[0442] When the number of the second power generation modules maintaining normal working state is 1, the working state of each battery pack in the second power generation module maintaining normal working state is controlled based on the load power of each battery pack in the second power generation module maintaining normal working state.

[0443] In some embodiments, the second processing module 420 may also be used to:

[0444] In the discharge state and after controlling at least one of the power generation modules to be not in the normal working state, when the sum of the load powers corresponding to the power generation modules in the normal working state is less than the load power corresponding to the power generation system, at least some of the power generation modules among all the power generation modules that are not in the normal working state are controlled to enter the normal working state, so that the sum of the load powers corresponding to the power generation modules in the normal working state is not less than the load power.

[0445] In some embodiments, the second processing module 420 may also be used to:

[0446] In a case where at least one of the power generation module and the battery pack is controlled not to be in a normal working state, determining a target comparison value based on a frequency and an amplitude of an output voltage of the inverter;

[0447] When the target comparison value is within a preset abnormal interval, at least one of the power generation modules that are not in a normal working state and / or at least one of the battery packs are controlled to enter a normal working state.

[0448] In some embodiments, the second processing module 420 may also be used to:

[0449] When the first operating parameter of the photovoltaic system in the non-pure storage type power generation module is greater than the first threshold and the power generation module with the first operating parameter greater than the first threshold is not in a normal working state, the power generation module with the first operating parameter greater than the first threshold 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 a normal working state.

[0450] In some embodiments, the second processing module 420 may also be used to:

[0451] Control the inverter corresponding to the energy storage system entering the first energy-saving state to shut down, and / or control the battery pack included in the energy storage system to shut down.

[0452] In some embodiments, the second processing module 420 may also be used to:

[0453] Control 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 work based on the target frequency, the target frequency is lower than the normal working frequency, and control the battery pack included in the energy storage system to maintain power supply

[0454] The control device of the power generation system in the embodiment of the present application can be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or other devices other than a terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (Mobile Internet Device, MID), an augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) device, a robot, a wearable device, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a netbook or a personal digital assistant (personal digital assistant, PDA), etc. It can also be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0455] The control device of the power generation system in the embodiment of the present application may be a device having an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0456] The control device of the power generation system provided in the embodiment of the present application can achieve Figures 1 to 3 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0457] The embodiment of the present application also provides a power generation system.

[0458] like Figure 5 As shown, the power generation system includes: at least one power generation module and a control device of the power generation system as described in any of the above embodiments.

[0459] Among them, each power generation module includes an energy storage system and an inverter connected to the energy storage system.

[0460] Each energy storage system includes at least one battery pack.

[0461] In some embodiments, the power generation module may also include a photovoltaic system.

[0462] Among them, the photovoltaic system is connected to the inverter.

[0463] In the grid-connected scenario, the inverter is also connected to the grid.

[0464] 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.

[0465] In some embodiments, the control device of the power generation system may include Figure 5 The intelligent standby identification module shown is connected to the inverter and the electric meter for communication respectively.

[0466] Fig.11 An inverter structure schematic diagram is illustrated.

[0467] like Fig.11 As shown, 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.

[0468] Fig.12 An example of a battery pack structure schematic diagram is shown.

[0469] like Fig.12 As shown, the battery pack may include: a control unit, a drive circuit, a power module, a power circuit and a battery cell connected in sequence, wherein the battery cell is communicatively connected to the control unit.

[0470] The power generation system provided in the embodiment of the present application adjusts the working status of the power generation module and the battery pack by combining the off-grid scenario and the presence or absence of backup power demand. While ensuring that the power generation system can meet the power supply demand, it can reduce the probability of problems such as long-term meaningless standby of the power generation module, a large ratio of system equipment loss to battery discharge power, or most of the energy output by the battery being used for standby loss of its own equipment. This saves energy consumption, significantly reduces electricity costs, and thus improves user experience.

[0471] In some embodiments, the power generation system may be an integrated photovoltaic storage unit or a split photovoltaic storage unit.

[0472] Combine the following Figure 5~Figure 10 , the specific structure of the power generation module is explained.

[0473] Figure 5 The schematic diagram of the structure of a power generation system composed of an integrated power generation module without a DC load is illustrated, wherein the load includes an AC load connected between the power grid and the power generation module (i.e. Figure 5 The load is shown in the figure), and the inverter and the energy storage system are integrated.

[0474] The total inverter power is the sum of the load power and the grid-fed power.

[0475] Figure 6An example is given of a structural schematic diagram of a power generation system consisting of a DC load integrated power generation module, wherein the load includes: a DC load and an AC load, and the inverter, the DC load and the energy storage system are integrated.

[0476] Figure 7 An example of a structural schematic diagram of a power generation system consisting of a split-type power generation module without a DC load is shown, wherein 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 separately arranged, and the inverter and the energy storage system are connected by a DC cable.

[0477] Figure 8 An example is given of a structural 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.

[0478] Fig. 9 The structural schematic diagram of another power generation system composed of a DC load split-type power generation module is illustrated, wherein the load includes: a DC load and an AC load; the DC load is integrated with the inverter and is separated from the energy storage system.

[0479] Fig.10 The structural schematic diagram of another power generation system composed of a DC load split-type power generation module is illustrated, wherein the load includes: a DC load and an AC load; the DC load, the integrated inverter and the energy storage system are separately arranged.

[0480] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the control method embodiment of the above-mentioned power generation system are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0481] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0482] An embodiment of the present application also provides a computer program product, including a computer program, which implements the control method of the above-mentioned power generation system when executed by a processor.

[0483] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0484] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the control method embodiment of the above-mentioned power generation system, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0485] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0486] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0487] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0488] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0489] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0490] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control method for a power generation system, characterized in that: The power generation system includes at least one power generation module, each of the power generation modules includes an energy storage system and an inverter connected to the energy storage system, each of the energy storage systems includes at least one battery pack, and the method includes: Obtaining the category of the power generation module, the working scenario of the power generation system and the backup power demand of the power generation system; the working scenario includes an off-grid scenario or a grid-connected scenario; the category includes a pure storage category or a non-pure storage category, and the power generation system of the non-pure storage category also includes a photovoltaic system; Based on the category, the working scenario and the backup power demand, control at least one of the working states of each of the power generation modules and the working state of each of the battery packs; the working state includes: a first energy-saving state, a second energy-saving state or a normal working state; The controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario and the backup power demand includes: Acquire a first operating parameter of a photovoltaic system in the non-pure storage type power generation module; Determine a non-pure storage type power generation module whose first operating parameter is greater than a first threshold as a first power generation module, and determine the remaining power generation modules among all power generation modules except the first power generation module as second power generation modules; Based on the working scenario and the backup power demand, control at least one of the working state of the second power generation module and the working state of each of the battery packs in the second power generation module; The controlling, based on the working scenario and the backup power demand, at least one of the working state of the second power generation module and the working state of each of the battery packs in the second power generation module comprises: In the grid-connected scenario, based on the backup power demand and the charge and discharge status of the energy storage system, controlling the working status of each of the second power generation modules and / or the working status of each of the battery packs; In the off-grid scenario, based on the load power of the power generation system, controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs; Controlling entry into the first energy-saving state includes: Controlling the inverter corresponding to the energy storage system entering the first energy-saving state to shut down, and / or controlling the battery pack included in the energy storage system to shut down; Controlling entry into the second energy-saving state includes: The power generation module and / or the power module inside the battery pack entering the second energy-saving state are controlled to block the wave or operate based on a target frequency, wherein 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.

2. The control method of the power generation system according to claim 1, characterized in that: In the grid-connected scenario, based on the backup power demand and the charge and discharge state of the energy storage system, controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs includes: Based on the charge and discharge state, obtaining a target judgment condition; Based on the target judgment condition, the charging and discharging status and the backup power demand, the working status of each of the second power generation modules and / or the working status of each of the battery packs is controlled.

3. The control method of the power generation system according to claim 2, characterized in that: The controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs based on the target judgment condition, the charging and discharging state and the backup power demand includes: When there is no backup power demand and the target judgment condition is met, controlling each of the second power generation modules to enter the first energy-saving state; When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter the first energy-saving state; When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is the charging state, each of the second power generation modules is controlled to maintain the normal working state.

4. The control method of the power generation system according to claim 3, characterized in that: When there is no backup power demand, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module 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 among all the second power generation modules except the first target power generation module are controlled to enter the first energy-saving state.

5. The control method of the power generation system according to claim 2, characterized in that: The controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs based on the target judgment condition, the charging and discharging state and the backup power demand includes: When there is a demand for backup power and the target judgment condition is met, controlling each of the second power generation modules to enter the second energy-saving state; When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter the second energy-saving state; When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a charging state, each of the second power generation modules is controlled to maintain the normal working state.

6. The control method of the power generation system according to claim 5, characterized in that: When there is a demand for backup power, the target judgment condition is not met, and the charge-discharge state is a discharge state, controlling at least part of the second power generation module to enter the second energy-saving state includes: Based on the load power corresponding to the power generation system, determine a second target power generation module from all 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 among all the second power generation modules except the second target power generation module are controlled to enter the second energy-saving state.

7. The control method of the power generation system according to claim 2, characterized in that: The acquiring of a target judgment condition based on the charge and discharge state includes: Performing a weighted summation on the charge states of each of the energy storage systems to obtain a first total charge value; When the charge-discharge state is a charging state, determining that the target judgment condition is that the first total charge value is not less than a first charge threshold value; When the charging and discharging state is the discharging state, the target judgment condition is determined as that the first total charge value is not greater than a second charge threshold, and / or that the load power corresponding to the power generation system is not greater than a second threshold.

8. The control method of the power generation system according to claim 1, characterized in that: In the off-grid scenario, controlling the working state of each of the second power generation modules and / or the working 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.

9. The control method of the power generation system according to claim 8, characterized in that: The 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: Accumulate 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, determine the second power generation module corresponding to the accumulated value as the fourth target power generation module, and determine the remaining second power generation modules in the second power generation module except the fourth target power generation module as the third target power generation module; The fourth target power generation module is controlled to maintain the normal working state, and the third target power generation module is controlled to enter the second energy-saving state.

10. The control method of the power generation system according to claim 9, 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 determining the second power generation module corresponding to the accumulated value as the fourth target power generation module includes: Acquire the load power corresponding to each of the second power generation modules and the charge state of each of the second power generation modules; Based on the order of the charge states, the load powers of the second power generation modules corresponding to the charge states are accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

11. The control method of the power generation system according to claim 9, 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 determining the second power generation module corresponding to the accumulated value as the fourth target power generation module includes: Obtaining the load power corresponding to each of the power generation modules; Based on the order of the load powers, the load powers are accumulated from large to small 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 second power generation module corresponding to the accumulated value is determined as the fourth target power generation module.

12. The control method of the power generation system according to claim 1, characterized in that: In the off-grid scenario, controlling the working state of each of the second power generation modules and / or the working 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 each battery pack in the second power generation module in the normal working state, the working state of each battery pack in the second power generation module in the normal working state is controlled.

13. The control method of the power generation system according to claim 12, characterized in that: The controlling the working state of each battery pack in the second power generation module in the normal working state based on the load power corresponding to each battery pack in the second power generation module in the normal working state comprises: A first target battery pack in the battery pack is controlled to enter the second energy-saving state, and a second target battery pack in the battery pack other than the first target battery pack is controlled to maintain the normal working state.

14. The control method of the power generation system according to claim 13, characterized in that: The controlling the first target battery pack in the battery pack to enter the second energy-saving state, and controlling the second target battery packs in the battery pack except the first target battery pack to maintain the normal working state, includes: Accumulate 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, determine the battery pack corresponding to the accumulated value as the second target battery pack, and determine the remaining battery packs in the battery pack except the second target battery pack as the first target battery pack; The second target battery pack is controlled to maintain the normal working state, and the first target battery pack is controlled to enter the second energy-saving state.

15. The control method of the power generation system according to claim 14, 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: Obtaining the load power corresponding to each of the battery packs and the charge state of each of the battery packs; Based on the order of the charge states, the load powers of the battery packs corresponding to the charge states are accumulated from large to small 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.

16. The control method of the power generation system according to claim 14, 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: Obtaining the load power corresponding to each of the battery packs; Based on the order of the load powers, the load powers are accumulated from large to small 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.

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

18. The control method of a power generation system according to any one of claims 1 to 17, characterized in that: The controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario and the backup power demand includes: In the discharge state and after controlling at least one of the power generation modules not to be in the normal working state, when the sum of the load powers corresponding to the power generation modules in the normal working state is less than the load power corresponding to the power generation system, at least some of the power generation modules among all the power generation modules that are not in the normal working state are controlled to enter the normal working state, so that the sum of the load powers corresponding to the power generation modules in the normal working state is not less than the load power.

19. The control method of a power generation system according to any one of claims 1 to 17, characterized in that: The controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario and the backup power demand includes: determining a target comparison value based on a frequency and an amplitude of an output voltage of the inverter when at least one of the power generation module and the battery pack is controlled not to be in the normal operating state; When the target comparison value is within a preset abnormal interval, at least one of the power generation modules that are not in the normal working state, and / or at least one of the battery packs, are controlled to enter the normal working state.

20. The control method of a power generation system according to any one of claims 1 to 17, characterized in that: The controlling at least one of the working state of each of the power generation modules and the working state of each of the battery packs based on the category, the working scenario and the backup power demand includes: When the first operating parameter of the photovoltaic system in the non-pure storage type power generation module is greater than the first threshold and the power generation module whose first operating parameter is greater than the first threshold is not in the normal working state, the power generation module whose first operating parameter is greater than the first threshold and / or at least one of the battery packs included in the power generation module whose first operating parameter is greater than the first threshold are controlled to enter the normal working state.

21. A control device for a power generation system, characterized in that: The power generation system includes at least one power generation module, each of the power generation modules includes an energy storage system and an inverter connected to the energy storage system, each of the energy storage systems includes at least one battery pack, and the device includes: A 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 demand of the power generation system; the working scenario includes an off-grid scenario or a grid-connected scenario; the category includes a pure storage category or a non-pure storage category, and the power generation system of the non-pure storage category also includes a photovoltaic system; A second processing module, configured to control at least one of a working state of each of the power generation modules and a working state of each of the battery packs based on the category, the working scenario and the backup power demand; the working state includes: a first energy-saving state, a second energy-saving state or a normal working state; The second processing module is used to: Acquire a first operating parameter of a photovoltaic system in the non-pure storage type power generation module; Determine a non-pure storage type power generation module whose first operating parameter is greater than a first threshold as a first power generation module, and determine the remaining power generation modules among all power generation modules except the first power generation module as second power generation modules; Based on the working scenario and the backup power demand, control at least one of the working state of the second power generation module and the working state of each of the battery packs in the second power generation module; The second processing module is used to: In the grid-connected scenario, based on the backup power demand and the charge and discharge status of the energy storage system, controlling the working status of each of the second power generation modules and / or the working status of each of the battery packs; In the off-grid scenario, based on the load power of the power generation system, controlling the working state of each of the second power generation modules and / or the working state of each of the battery packs; Controlling entry into the first energy-saving state includes: Controlling the inverter corresponding to the energy storage system entering the first energy-saving state to shut down, and / or controlling the battery pack included in the energy storage system to shut down; Controlling entry into the second energy-saving state includes: The power generation module and / or the power module inside the battery pack entering the second energy-saving state are controlled to block the wave or operate based on a target frequency, wherein 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.

22. A power generation system, characterized in that: include: At least one power generation module, each of the power generation modules comprising an energy storage system and an inverter connected to the energy storage system, each of the energy storage systems comprising at least one battery pack; The control device for the power generation system as claimed in claim 21, wherein the control device for the power generation system is electrically connected to the power generation module.

23. The power generation system according to claim 22, characterized in that: The power generation module further includes: a photovoltaic system, and the photovoltaic system is connected to the inverter.

24. The power generation system according to claim 22, characterized in that: The power generation module is an integrated photovoltaic storage unit or a split photovoltaic storage unit.

25. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the power generation system as described in any one of claims 1 to 20 is implemented.

26. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the control method of the power generation system according to any one of claims 1 to 20 is implemented.

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