Control method and device of light storage system, photovoltaic system, storage medium and computer program product

Abstract

The invention discloses a control method and device of an optical storage system, a photovoltaic system, a storage medium and a computer program product, and belongs to the field of photovoltaic systems. The control method of the optical storage system comprises the steps that a sampling signal of the optical storage system is acquired, and the sampling signal comprises the actual circuit temperature and / or the actual current corresponding to the optical storage system; and under the condition that the sampling signal is greater than the target threshold value corresponding to the sampling signal, raising the bus voltage of the optical storage system. According to the control method of the optical storage system, the risk of over-temperature protection of the optical storage system can be reduced without derating operation of the optical storage system, the stability of internal charging and discharging power of the optical storage system is improved, and the stability of the internal charging and discharging power of the optical storage system is improved under the condition that the optical storage system comprises a direct-current load. The stability of the charging power output of the optical storage system to the direct current load is improved, the charging efficiency is improved, and the user experience is improved.

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 photovoltaic storage system, a photovoltaic system, a storage medium, and a computer program product. Background Art

[0002] A DC-coupled photovoltaic storage system can generally include photovoltaic modules, inverters, and energy storage modules. In some cases, it can also include DC loads (such as charging piles). The busbars are connected by DC cables or busbars, and there is power flow between various devices. Therefore, there is often a relatively large current on the DC cable or busbar. For example, when the photovoltaic storage system includes a DC load, when the DC pile is charged at high power, photovoltaics, power grids, and energy storage provide power to the DC load at the same time. The long-term flow of large current on the DC cable or busbar will cause the DC cable, busbar, or connector to heat up, causing the equipment to need to be derated or shut down due to overtemperature. In more serious cases, long-term heating will cause safety hazards. In related technologies, when the system detects that the temperature of the device is too high, it will reduce the power of the system DC busbar to reduce the temperature of the device, but this control strategy will reduce the charging and discharging speed of the energy storage unit inside the system or the charging speed of the DC charging pile, prolong the charging time, and affect the user experience. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a control method, device, photovoltaic system, storage medium and computer program product of a photovoltaic storage system, which can reduce the risk of over-temperature protection of the photovoltaic storage system without derating the photovoltaic storage system, improve the stability of the charging and discharging power inside the photovoltaic storage system, and improve the stability of the charging power output of the photovoltaic storage system to the DC load when the photovoltaic storage system includes a DC load, improve the charging efficiency, and thus enhance the user experience.

[0004] In a first aspect, the present application provides a control method for a photovoltaic storage system, the method comprising: Acquiring a sampling signal of the photovoltaic storage system, wherein the sampling signal includes an actual circuit temperature and / or an actual current corresponding to the photovoltaic storage system; When the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is increased.

[0005] According to the control method of the photovoltaic storage system of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the ability to select devices with lower current specifications, saving the cost of photovoltaic storage system devices, and reducing the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0006] According to an embodiment of the present application, when the sampling signal is greater than a target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system includes: Based on an open-loop control algorithm or a closed-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is increased.

[0007] According to an embodiment of the present application, based on the open-loop control algorithm, when the sampling signal is greater than the target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system includes: Obtaining a target voltage lift value based on a preset relationship table; the preset relationship table is pre-constructed based on test data; Based on the target voltage raising value, the bus voltage of the photovoltaic energy storage system is raised.

[0008] According to an embodiment of the present application, the actual circuit temperature includes the temperature of the connector terminals of each device included in the photovoltaic storage system, the bus temperature of the bus sampling point of each device, and the DC cable temperature of the DC cable; The step of obtaining the target voltage raising value based on the preset relationship table includes: Based on at least one of the connector terminal temperature, the busbar temperature and the DC cable temperature, the preset relationship table is queried to determine the target voltage raising value.

[0009] According to an embodiment of the present application, the step of querying the preset relationship table based on at least one of the connector terminal temperature, the busbar temperature, and the DC cable temperature to determine the target voltage lift value includes: Acquire, based on the preset relationship table, candidate voltage lift values ​​corresponding to each target temperature in the actual circuit temperature that is greater than the target threshold; Determining the target voltage boost value based on each of the candidate voltage boost values; or, Query the preset relationship table to obtain a first voltage lift value corresponding to the maximum plug-in terminal temperature among the plug-in terminal temperatures; Query the preset relationship table to obtain a second voltage lift value corresponding to the maximum bus temperature among the bus temperatures; Query the preset relationship table to obtain a third voltage rise value corresponding to the DC cable temperature; Determining the target voltage boost value based on the first voltage boost value, the second voltage boost value, and the third voltage boost value; or, The maximum temperature among the actual circuit temperatures is obtained, and the preset relationship table is queried based on the maximum temperature to obtain the target voltage raising value.

[0010] According to one embodiment of the present application, the actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; The step of obtaining the target voltage raising value based on the preset relationship table includes: Acquire, based on the preset relationship table, candidate voltage lift values ​​corresponding to each target current in the actual current that is greater than the target threshold; Determining the target voltage boost value based on each of the candidate voltage boost values; or, The maximum current in the actual current is obtained, and the preset relationship table is queried based on the maximum current to obtain the target voltage raising value.

[0011] According to an embodiment of the present application, based on the closed-loop control algorithm, when the sampling signal is greater than the target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system includes: Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as a fourth voltage raising value; Determining a target voltage boost value based on each of the fourth voltage boost values; Based on the target voltage raising value, the bus voltage of the photovoltaic energy storage system is raised.

[0012] According to an embodiment of the present application, the actual circuit temperature includes the temperature of the connector terminals of each device included in the photovoltaic storage system, the bus temperature of the bus sampling point of each device, and the DC cable temperature of the DC cable; The bus voltage corresponding to the sampling signal that is greater than the target threshold is raised based on the target step length until the adjusted sampling signal is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value, including: Raising the bus voltage corresponding to at least one target temperature of the actual circuit temperatures that is greater than the target threshold based on the target step size; When the adjusted target temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value corresponding to the target temperature; or, When the maximum plug-in terminal temperature among the plug-in terminal temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum plug terminal temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fifth voltage raising value corresponding to the maximum plug terminal temperature; When the maximum bus temperature among the bus temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum bus temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the sixth voltage raising value corresponding to the maximum bus temperature; When the DC cable temperature is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted DC cable temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the seventh voltage raising value corresponding to the DC cable temperature; determining the fourth voltage boost value based on the fifth voltage boost value, the sixth voltage boost value and the seventh voltage boost value; or, When a maximum temperature among the actual circuit temperatures is greater than the target threshold, raising a bus voltage corresponding to the maximum temperature based on the target step size; When the adjusted maximum temperature is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum temperature.

[0013] According to one embodiment of the present application, the actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; The bus voltage corresponding to the sampling signal that is greater than the target threshold is raised based on the target step length until the adjusted sampling signal is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value, including: Raising the bus voltage corresponding to at least one target current of the actual current that is greater than the target threshold based on the target step size; When the adjusted target current is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value corresponding to the target current; or, When the maximum current in the actual current is greater than the target threshold, raising the bus voltage corresponding to the maximum current based on the target step size; When the adjusted maximum current is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum current.

[0014] In a second aspect, the present application provides a control device for a photovoltaic storage system, the device comprising: A first processing module, configured to obtain a sampling signal of the photovoltaic storage system, wherein the sampling signal includes an actual circuit temperature and / or an actual current corresponding to the photovoltaic storage system; The second processing module is used to raise the bus voltage of the photovoltaic storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal.

[0015] According to the control device of the photovoltaic storage system of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the ability to select devices with lower current specifications, save the cost of photovoltaic storage system devices, and reduce the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, thereby reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0016] In a third aspect, the present application provides a photovoltaic system, the system comprising: Photovoltaic modules; A photovoltaic storage inverter, the photovoltaic storage inverter is electrically connected to the photovoltaic module, and the photovoltaic storage inverter is used to access the power grid; An energy storage module, wherein the energy storage module is connected to the photovoltaic storage inverter via a connector and / or a DC cable; A DC bus control device, wherein the DC bus control device is electrically connected to the photovoltaic storage inverter and the energy storage module respectively, and the DC bus control device controls the bus voltage of the photovoltaic system based on the control method of the photovoltaic storage system as described in the first aspect.

[0017] According to the photovoltaic system of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the ability to select devices with lower current specifications, saving the cost of photovoltaic storage system devices, and reducing the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0018] According to one embodiment of the present application, it also includes: A DC load is arranged between the photovoltaic inverter and the energy storage module in an integrated or split manner, and the DC load is connected via the connector terminal and / or the DC cable.

[0019] According to an embodiment of the present application, the DC bus control device includes a plurality of regulators, the plurality of regulators are arranged in a one-to-one correspondence with the sampling signals, and the plurality of regulators are used to adjust the corresponding sampling signals.

[0020] According to one embodiment of the present application, the DC bus control device includes: At least one of the temperature control device and the current control device and an integrated control device, wherein the input end of the integrated control device is electrically connected to the output ends of the temperature control device and the current control device respectively.

[0021] 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 of the optical storage system as described in the first aspect above.

[0022] 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 photovoltaic storage system as described in the first aspect above.

[0023] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects: By obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the possibility of selecting devices with lower current specifications, saving the cost of photovoltaic storage system devices, and reducing the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0024] Furthermore, by raising the bus voltage of the photovoltaic storage system based on an open-loop control algorithm or a closed-loop control algorithm when the sampling signal is greater than the target threshold corresponding to the sampling signal, a variety of control methods for raising the bus voltage can be implemented, thereby improving the flexibility and adaptability of the control method.

[0025] Furthermore, by querying a preset relationship table based on at least one of the connector terminal temperature, the busbar temperature and the DC cable temperature to determine the target voltage raise value, it is possible to implement multiple methods for determining the target voltage raise value when the sampling signal is the actual circuit temperature, thereby improving the flexibility of determining the target voltage raise value when the sampling signal is the actual circuit temperature, thereby improving the adaptability of the control method.

[0026] Furthermore, through a closed-loop control algorithm, the bus voltage corresponding to the sampling signal that is greater than the target threshold is raised based on the target step size until the adjusted sampling signal is not less than the target threshold, the target step size is reduced, and the reduced target step size is determined as the fourth voltage raise value, and then the target voltage raise value is determined based on each fourth voltage raise value, so that the bus voltage of the photovoltaic storage system is raised based on the target voltage raise value, and tracking feedback control of the change of the target step size (control quantity) based on the sampling signal (feedback value) and the target threshold (reference value) can be achieved, thereby improving the accuracy and stability of the control of the bus voltage of the photovoltaic storage system.

[0027] 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

[0028] 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: Figure 1is a flow chart of a control method of a photovoltaic storage system provided in an embodiment of the present application; Figure 2 This is one of the result schematic diagrams of the control method of the photovoltaic storage system provided in the embodiment of the present application; Figure 3 This is the second result schematic diagram of the control method of the photovoltaic storage system provided in the embodiment of the present application; Figure 4 It is one of the structural schematic diagrams of the photovoltaic system provided in the embodiment of the present application; Figure 5 This is the second structural schematic diagram of the photovoltaic system provided in the embodiment of the present application; Figure 6 This is the third structural schematic diagram of the photovoltaic system provided in the embodiment of the present application; Figure 7 This is the fourth structural schematic diagram of the photovoltaic system provided in the embodiment of the present application; Figure 8 This is the fifth structural diagram of the photovoltaic system provided in the embodiment of the present application; Fig. 9 This is the sixth structural schematic diagram of the photovoltaic system provided in the embodiment of the present application; Fig.10 This is the seventh structural schematic diagram of the photovoltaic system provided in the embodiment of the present application; Fig.11 This is the eighth structural schematic diagram of the photovoltaic system provided in the embodiment of the present application; Fig.12 is a schematic diagram of the structure of a control device for a photovoltaic storage system provided in an embodiment of the present application; Fig.13 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] In combination with the accompanying drawings, the control method of the photovoltaic storage system, the control device of the photovoltaic storage system, the photovoltaic system and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0032] The control method of the optical storage system may be applied to a terminal, and may be specifically executed by hardware or software in the terminal.

[0033] The terminal includes but is not limited to portable communication devices such as mobile phones or tablet computers. It should also be understood that in some embodiments, the terminal may not be a portable communication device, but a desktop computer.

[0034] The control method of the photovoltaic storage system provided in the embodiment of the present application can be executed by the photovoltaic storage system or a functional module or functional entity in the photovoltaic storage system that can implement the control method of the photovoltaic storage system. The control method of the photovoltaic storage system provided in the embodiment of the present application is described below using the photovoltaic storage system as an example of the execution subject.

[0035] like Figure 1 As shown, the control method of the photovoltaic storage system includes: step 110 and step 120.

[0036] Step 110: Acquire a sampling signal of the photovoltaic storage system, where the sampling signal includes an actual circuit temperature and / or actual current corresponding to the photovoltaic storage system; In this step, the photovoltaic storage system may be a DC bus-coupled photovoltaic storage system, which may include photovoltaic modules and photovoltaic storage units.

[0037] Among them, photovoltaic modules are used for photovoltaic power generation.

[0038] The photovoltaic storage unit may include a photovoltaic storage inverter and an energy storage module, etc.

[0039] The photovoltaic storage inverter is electrically connected to the photovoltaic module, and the photovoltaic storage inverter is used to access the power grid.

[0040] The energy storage module may include multiple battery packs to store electrical energy and release the energy when needed.

[0041] The energy storage module and the photovoltaic storage inverter can be connected through plug-in terminals, or through plug-in terminals and DC cables.

[0042] The battery packs included in the energy storage module can be connected via connector terminals.

[0043] In some embodiments, the photovoltaic storage unit may also include a DC load, such as a charging station.

[0044] In this embodiment, the DC load is arranged between the photovoltaic energy storage inverter and the energy storage module in an integrated or split manner, and the DC load is connected via connector terminals and / or DC cables.

[0045] Among them, Figure 8 As shown, the integrated type can be understood as a DC load connected between the photovoltaic inverter and the energy storage module through a plug-in terminal.

[0046] like Fig. 9 , Fig.10 and Fig.11 As shown, the split type can be understood as a DC load connected between the photovoltaic inverter and the energy storage module through a DC cable and a connector.

[0047] The sampling signal is an actual circuit signal of a device or a sampling point of a device in the optical storage system.

[0048] The components may include connectors, DC busbars, and DC cables.

[0049] In actual implementation, the sampling signal may be collected by a sensor disposed on the device or a sampling point of the device.

[0050] The sampled signal may include at least one of actual circuit temperature and actual current.

[0051] In some embodiments, the actual circuit temperature may include the temperature of each device connector terminal, the bus temperature of each device bus sampling point, and the DC cable temperature, etc., wherein the device may include a photovoltaic storage inverter and each battery pack. When the photovoltaic storage system includes a DC load, the device may also include a DC load.

[0052] In some embodiments, the actual current may include the bus current of each device bus sampling point and the DC current of the DC cable.

[0053] In the actual implementation process, at the same time, the sampling values ​​of the sampling signals of the devices corresponding to the devices in the optical storage system may be different.

[0054] Step 120: When the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic energy storage system is increased.

[0055] In this step, the target threshold may include a temperature threshold and a current threshold.

[0056] In some embodiments, when the sampling signal is the actual circuit temperature, the target threshold corresponding to the sampling signal is the temperature threshold; when the sampling signal is the actual current, the target threshold corresponding to the sampling signal is the current threshold.

[0057] In actual implementation, the temperature threshold may be determined in advance based on test data, and the current threshold may be determined in advance based on current specifications of each device.

[0058] The temperature thresholds corresponding to the temperatures included in the actual circuit temperature may be different, and the current thresholds corresponding to the currents included in the actual current may be different.

[0059] During the actual implementation process, when the actual circuit temperature of one or some components or equipment sampling points is greater than the corresponding temperature threshold, the photovoltaic storage system may be derated or shut down due to over-temperature. In this case, the bus voltage of the photovoltaic storage system can be increased to reduce the bus current of the photovoltaic storage system, thereby reducing the temperature of the device corresponding to the sampling signal without the need to derate the photovoltaic storage system.

[0060] For example, Figure 2 As shown, it is assumed that before the temperature of a certain device rises, the charging and discharging power of each battery pack coupled to the DC bus and the DC load power are relatively stable. As the running time increases, the thermal accumulation effect causes the system to exceed the temperature threshold of this device at time t1, at which time the bus voltage begins to rise. As the bus voltage rises, the current flowing through the DC bus begins to decrease. After a period of time, the device temperature begins to drop until time t2, when the device temperature drops to near the temperature threshold. After a short-term fluctuation adjustment, the bus rises and stabilizes near △Vbus. It can be seen that after the device temperature rises, the system does not need to be derated, and the system can continue to operate at constant power by simply raising the DC bus.

[0061] In some embodiments, when the current threshold of the actual current is the current specification of each device, in the actual implementation process, when the actual current of one or some devices or equipment sampling points is greater than the current specification corresponding to each device, it may cause damage to the device itself. In this case, the bus voltage of the photovoltaic storage system can be raised to reduce the current of the photovoltaic storage system, so that the current of each device or each device sampling point is less than its corresponding current threshold. Therefore, in the actual application process, devices with smaller current specifications can be used to save device costs without affecting the operating efficiency and device safety of the photovoltaic storage system.

[0062] For example, Figure 3As shown, it is assumed that before t1, the bus current is lower than the bus current specification. At t1, the power reference of the system is raised, and the DC bus current begins to rise as the system power rises. At t2, the DC bus current exceeds the bus current specification, and the bus voltage begins to rise. Then the actual power rises rapidly. At t3, the bus current reaches the maximum value and then begins to decline. After a short adjustment, the bus current remains near the current specification. It can be seen that by raising the DC bus voltage, the DC bus current can be prevented from exceeding the bus current specification when the system power increases.

[0063] In some embodiments, the bus voltage of the photovoltaic energy storage system can be increased based on a DC bus control device electrically connected to the photovoltaic energy storage inverter and the energy storage module respectively.

[0064] In this embodiment, if Figure 5 As shown, the DC bus control device can receive sampling signals from each device or sampling points of the photovoltaic storage inverter and the energy storage module, thereby obtaining the bus voltage lift value of the photovoltaic storage system, and transmitting the bus voltage lift value to the photovoltaic storage inverter, thereby realizing the control of the bus voltage of the photovoltaic storage system.

[0065] During the research and development process, the inventor discovered that a DC-coupled photovoltaic storage system can generally include photovoltaic modules, inverters, and energy storage modules. In some cases, it can also include DC loads (such as charging piles). The busbars are connected by DC cables or busbars, and there is power flow between various devices. Therefore, there is often a relatively large current on the DC cable or busbar. For example, when the photovoltaic storage system includes a DC load, when the DC pile is charged at high power, photovoltaics, power grids, and energy storage provide power to the DC load at the same time. The long-term flow of large current on the DC cable or busbar will cause the DC cable, busbar, or connector to heat up, causing the equipment to need to be derated or shut down due to overtemperature. In more serious cases, long-term heating will cause safety hazards. In related technologies, when the system detects that the temperature of the device is too high, it will reduce the power of the system DC busbar to reduce the temperature of the device, but this control strategy will reduce the charging and discharging speed of the energy storage unit inside the system or the charging speed of the DC charging pile, prolong the charging time, and affect the user experience.

[0066] In the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the ability to select devices with lower current specifications, saving the cost of photovoltaic storage system devices, and reducing the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0067] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the ability to select devices with lower current specifications, save the cost of photovoltaic storage system devices, and reduce the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, thereby reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0068] In some embodiments, step 120 may include: Based on an open-loop control algorithm or a closed-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic energy storage system is raised.

[0069] In this embodiment, the open-loop control algorithm is an algorithm that generates a control signal according to a predetermined input signal without considering the actual output result.

[0070] The closed-loop control algorithm is based on comparing the output signal with the expected output signal to obtain an error signal, and then adjusting the input signal based on the error signal with the goal of reducing the error signal so that the output signal moves closer to the expected output signal.

[0071] It is understandable that the control process of raising the bus voltage of the photovoltaic storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal can be implemented based on any one of the open-loop control algorithm and the closed-loop control algorithm.

[0072] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, by raising the bus voltage of the photovoltaic storage system based on an open-loop control algorithm or a closed-loop control algorithm when the sampling signal is greater than the target threshold corresponding to the sampling signal, a variety of control methods for raising the bus voltage can be implemented, thereby improving the flexibility and adaptability of the control method.

[0073] The following describes a specific method for raising the bus voltage of the photovoltaic storage system based on an open-loop control algorithm when the sampling signal is greater than the target threshold corresponding to the sampling signal.

[0074] In some embodiments, based on an open-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic energy storage system may include: Obtaining a target voltage raise value based on a preset relationship table; Based on the target voltage increase value, the bus voltage of the photovoltaic energy storage system is increased.

[0075] In this embodiment, the voltage boost value is a bus voltage value for boosting the bus voltage of the photovoltaic energy storage system.

[0076] The preset relationship table is a one-to-one correspondence relationship table between multiple sampling values ​​of the same sampling signal and multiple bus voltage lift values.

[0077] For example, the preset relationship table of the temperature of a device connector terminal includes temperature value 1, temperature value 2 and temperature value 3. Temperature value 1 corresponds to bus voltage rise value 1, temperature value 2 corresponds to bus voltage rise value 2, and temperature value 3 corresponds to bus voltage rise value 3.

[0078] It should be noted that, in the preset relationship table, the larger the sampling signal, the larger the target voltage lift value; and the smaller the sampling signal, the smaller the target voltage lift value.

[0079] In the actual execution process, each sampling signal corresponds to its own preset relationship table. For example, each device connector terminal temperature corresponds to its own preset relationship table.

[0080] The preset relationship table corresponding to each sampling signal may be constructed in advance based on test data.

[0081] It is understandable that the preset relationship tables corresponding to the sampling signals may be different.

[0082] The target voltage raising value is a voltage raising value corresponding to the sampling signal when the sampling signal is greater than a target threshold value corresponding to the sampling signal.

[0083] In the actual implementation process, raising the bus voltage of the photovoltaic storage system based on the target voltage raising value can reduce the bus current of the photovoltaic storage system, so that the sampling signal corresponding to the target voltage raising value is less than the corresponding target threshold.

[0084] It should be noted that in open-loop control, the acquisition of the above-mentioned target voltage raising value and the raising of the bus voltage of the photovoltaic storage system based on the target voltage raising value are dynamic and real-time, that is, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the target voltage raising value is acquired in real time based on the preset relationship table, and based on the target voltage raising value, the bus voltage of the photovoltaic storage system is raised.

[0085] For example, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the target voltage increase value 1 is obtained at time t1, and the bus voltage of the photovoltaic storage system is increased based on the target voltage increase value 1. When the sampling signal drops to a value less than the original sampling signal at time t2 but not less than the target threshold, the target voltage increase value 2 is obtained, and the bus voltage of the photovoltaic storage system is increased based on the target voltage increase value 2.

[0086] It can be understood that the open-loop control algorithm is an algorithm that obtains the target voltage increase value corresponding to each sampling signal based on the sampling signals obtained in real time to increase the bus voltage of the photovoltaic storage system, rather than adjusting the target voltage increase value based on the feedback of the increased bus voltage.

[0087] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, through an open-loop control algorithm, a target voltage increase value is obtained based on a preset relationship table, and based on the target voltage increase value, the bus voltage of the photovoltaic storage system is increased. This can achieve real-time acquisition of the target voltage increase value based on a table lookup method, improve the efficiency of acquiring the control signal for increasing the bus voltage, and thus improve the control efficiency of the bus voltage of the photovoltaic storage system based on the open-loop control algorithm.

[0088] It can be understood that based on the open-loop control algorithm, when the sampling signal is greater than the target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system can be divided into two cases: 1) when the sampling signal is the actual circuit temperature; 2) when the sampling signal is the actual circuit temperature. The two cases are described below.

[0089] First, open-loop control when the sampling signal is the actual circuit temperature In some embodiments, the actual circuit temperature includes the temperature of the connectors of each device included in the photovoltaic storage system, the bus temperature of the bus sampling point of each device, and the DC cable temperature of the DC cable; obtaining the target voltage rise value based on the preset relationship table may include: Based on at least one of the connector terminal temperature, the busbar temperature and the DC cable temperature, a preset relationship table is queried to determine a target voltage lift value.

[0090] In this embodiment, it can be understood that when the actual circuit temperature includes the connector temperature of each device included in the photovoltaic storage system, the bus temperature of the bus sampling point of each device, and the DC cable temperature of the DC cable, there may be three situations: 1) Based on the case where one of the connector terminal temperature, the bus temperature or the DC cable temperature is greater than the corresponding temperature threshold, query the corresponding preset relationship table to determine the target voltage increase value; 2) Based on the case where the pairwise combination of the connector terminal temperature, the bus temperature and the DC cable temperature is greater than the corresponding temperature threshold, query the corresponding preset relationship table to determine the target voltage increase value; 3) Based on the case where the connector terminal temperature, the bus temperature and the DC cable temperature are greater than the corresponding temperature threshold, query the corresponding preset relationship table to determine the target voltage increase value.

[0091] In the actual execution process, the process of querying the corresponding preset relationship table and determining the target voltage raising value is different in different situations.

[0092] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, by querying a preset relationship table based on at least one of the connector temperature, the bus temperature and the DC cable temperature, the target voltage lift value is determined. This allows for multiple methods of determining the target voltage lift value when the sampling signal is the actual circuit temperature, thereby improving the flexibility of determining the target voltage lift value when the sampling signal is the actual circuit temperature, and thus improving the adaptability of the control method.

[0093] In some embodiments, based on at least one of the temperature of the plug terminal, the temperature of the busbar, and the temperature of the DC cable, querying a preset relationship table to determine the target voltage increase value may include: Obtaining candidate voltage lift values ​​corresponding to each target temperature greater than a target threshold value in the actual circuit temperature based on a preset relationship table; Based on the candidate voltage boost values, a target voltage boost value is determined.

[0094] In this embodiment, the target temperature is an actual circuit temperature that is greater than a corresponding target threshold.

[0095] The candidate voltage boost values ​​are voltage boost values ​​corresponding to actual circuit temperatures greater than the target threshold.

[0096] It can be understood that a target temperature greater than each corresponding target threshold value can be obtained from all temperatures included in the actual circuit temperature obtained. The target temperature may include the connector temperature, the bus temperature and the DC cable temperature. The voltage boost value corresponding to each target temperature is obtained based on a preset relationship table as a candidate voltage boost value, and then the target voltage boost value is determined based on each candidate voltage boost value.

[0097] In the actual implementation process, the target voltage boost value may be obtained based on the competition among the candidate voltage boost values.

[0098] The competition may be a method of taking an average value or a maximum value, and in some embodiments, may also be a weighted average method, which is not limited in the present application.

[0099] In some embodiments, based on at least one of the temperature of the plug terminal, the temperature of the busbar, and the temperature of the DC cable, querying a preset relationship table to determine the target voltage increase value may include: Querying a preset relationship table to obtain a first voltage rise value corresponding to a maximum plug-in terminal temperature among the plug-in terminal temperatures; Query the preset relationship table to obtain the second voltage lift value corresponding to the maximum bus temperature among the bus temperatures; Query the preset relationship table to obtain the third voltage rise value corresponding to the DC cable temperature; Based on the first voltage boost value, the second voltage boost value, and the third voltage boost value, a target voltage boost value is determined.

[0100] In this embodiment, it can be understood that the voltage rise value corresponding to the maximum temperature of each connector terminal temperature and each bus temperature and the DC cable temperature can be obtained respectively, and then the target voltage rise value can be determined based on the obtained voltage rise value.

[0101] In some embodiments, the method of determining the target voltage boost value based on the first voltage boost value, the second voltage boost value and the third voltage boost value can be similar to the above-mentioned method of determining the target voltage boost value based on each candidate voltage boost value, which is not elaborated in this application.

[0102] In some embodiments, based on at least one of the temperature of the plug terminal, the temperature of the busbar, and the temperature of the DC cable, querying a preset relationship table to determine the target voltage increase value may include: The maximum temperature of the actual circuit temperature is obtained, and a preset relationship table is queried based on the maximum temperature to obtain a target voltage increase value.

[0103] In this embodiment, it can be understood that the maximum temperature can be determined among all the temperatures included in the actual circuit temperature obtained. The maximum temperature can be the connector temperature, the bus temperature or the DC cable temperature. Then, based on the maximum temperature, the voltage raise value corresponding to the maximum temperature in the preset relationship table is queried, and the voltage raise value is determined as the target voltage raise value.

[0104] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, by further providing a plurality of methods for determining the target voltage raise value based on the open-loop control algorithm based on the temperature of the connector terminals of each device, the bus temperature of each device bus sampling point and the DC cable temperature included in the actual circuit temperature when the sampling signal is the actual circuit temperature, the flexibility of determining the target voltage raise value can be further improved to provide users with a variety of options, further improve the bus voltage raised by the target voltage raise value, and thus reduce the adaptability and reliability of the temperature of each device in the photovoltaic storage system.

[0105] Second, open-loop control when the sampling signal is the actual current In some embodiments, the actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; obtaining the target voltage rise value based on the preset relationship table may include: Obtaining candidate voltage lift values ​​corresponding to each target current greater than a target threshold value in the actual current based on a preset relationship table; Determining a target voltage boost value based on each candidate voltage boost value; In this embodiment, the target current is an actual current that is greater than a corresponding target threshold value.

[0106] The candidate voltage boost values ​​are voltage boost values ​​corresponding to actual currents that are greater than the target threshold.

[0107] It can be understood that when the sampling signal is the actual current, obtaining the target voltage boost value based on the preset relationship table is similar to the case where the sampling signal is the actual circuit temperature. A target current greater than each corresponding target threshold can be obtained from all currents included in the actual current obtained. The target current may include the bus current and the DC current of the DC cable. Based on the preset relationship table, the voltage boost value corresponding to each target temperature is obtained as a candidate voltage boost value, and then based on each candidate voltage boost value, the target voltage boost value is determined through competition.

[0108] In some embodiments, the actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; obtaining the target voltage rise value based on the preset relationship table may include: The maximum current in the actual current is obtained, and the preset relationship table is queried based on the maximum current to obtain the target voltage lift value.

[0109] In this embodiment, it can be understood that when the sampling signal is the actual current, obtaining the target voltage lift value based on the preset relationship table is similar to the case where the sampling signal is the actual circuit temperature. The maximum current can be determined among all the currents included in the actual current obtained. The maximum current can be the bus current or the DC current of the DC cable. Based on the maximum current, the voltage lift value corresponding to the maximum current in the preset relationship table is queried, and the voltage lift value is determined as the target voltage lift value.

[0110] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, by further providing a plurality of methods for determining the target voltage raise value based on the open-loop control algorithm based on the bus current of each device included in the actual current and the DC current of the DC cable when the sampling signal is the actual current, the flexibility of determining the target voltage raise value can be further improved, so as to provide users with a variety of options, improve the bus voltage raised by the target voltage raise value, and thus reduce the adaptability and reliability of the current of each device in the photovoltaic storage system.

[0111] like Figure 4 As shown, it should be noted that, in the case of raising the bus voltage of the photovoltaic storage system based on the above-mentioned open-loop control algorithm, the sampling signal can include the actual circuit temperature and the actual current at the same time, and obtain the target voltage raising value corresponding to the actual circuit temperature included in the sampling signal and the target voltage raising value corresponding to the actual current included in the sampling signal based on the above process, and then obtain the final bus voltage raising value based on the target voltage raising value competition, so as to control the bus voltage of the photovoltaic storage system based on the final bus voltage raising value.

[0112] The following describes a specific method for raising the bus voltage of the photovoltaic storage system based on a closed-loop control algorithm when the sampling signal is greater than the target threshold corresponding to the sampling signal.

[0113] In some embodiments, based on a closed-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic energy storage system may include: Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value; Determining a target voltage boost value based on each fourth voltage boost value; Based on the target voltage increase value, the bus voltage of the photovoltaic energy storage system is increased.

[0114] In this embodiment, the target step size is the bus voltage rise value corresponding to the sampling signal when the sampling signal is greater than the target threshold value corresponding to the sampling signal in the closed-loop control.

[0115] In actual execution, the target step size can be customized by the user.

[0116] For example, the target step size can be set to 3V or 5V, etc.

[0117] In the actual implementation process, the bus voltage corresponding to the sampling signal greater than the target threshold can be gradually raised based on the target step size until the adjusted sampling signal is less than the target threshold, and then the target step size is reduced and the reduced target step size is determined as the fourth voltage raising value.

[0118] For example, assuming that the sampling signal is a certain actual circuit temperature, and the temperature threshold corresponding to the actual circuit temperature is 80°C, and the target step size is set to 3V, the actual circuit temperature is 90°C at a certain moment, which is greater than the temperature threshold, then the bus voltage corresponding to the actual circuit temperature is raised with 3V as the target step size, and when the bus voltage before the raise is M, each time it is raised, the bus voltage M corresponding to the actual circuit temperature will be increased by 3V on the basis of the last raise, that is, after the first raise, the bus voltage corresponding to the actual circuit temperature is M+3V, and after the second raise, the bus voltage corresponding to the actual circuit temperature is M+3V+3V, and so on. After each raise, the actual circuit temperature will change accordingly based on the adjusted bus voltage, and as the bus voltage gradually rises, the actual circuit temperature gradually decreases until it is less than the temperature threshold, and then the target step size is reduced, and the reduced target step size is determined as the fourth voltage raise value.

[0119] The specific value of reducing the target step size can be set by the user. For example, when the target step size is 3V, the specific value of reducing the target step size can be set to 1V or 2V.

[0120] It can be understood that the closed-loop control algorithm is an algorithm that compares the sampled signal with the target threshold to generate an error signal, and then adjusts the target step size based on the error signal with the goal of reducing the error signal so that the sampled signal moves closer to the target threshold.

[0121] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, through a closed-loop control algorithm, the bus voltage corresponding to the sampling signal that is greater than the target threshold is raised based on the target step size until the adjusted sampling signal is less than the target threshold, the target step size is reduced, and the reduced target step size is determined as the fourth voltage raise value, and then the target voltage raise value is determined based on each fourth voltage raise value, so as to raise the bus voltage of the photovoltaic storage system based on the target voltage raise value, and tracking feedback control of the change of the target step size (control quantity) based on the sampling signal (feedback value) and the target threshold (reference value) can be achieved, thereby improving the accuracy and stability of the control of the bus voltage of the photovoltaic storage system.

[0122] First, closed-loop control when the sampling signal is the actual circuit temperature In some embodiments, the actual circuit temperature includes the temperature of the connector terminals of each device included in the photovoltaic storage system, the bus temperature of each bus, and the DC cable temperature of the DC cable; Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value may include: Raising the bus voltage corresponding to at least one target temperature greater than a target threshold value among the actual circuit temperatures based on the target step size; When the adjusted target temperature is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the target temperature.

[0123] In this embodiment, it can be understood that a target temperature greater than each corresponding target threshold value can be obtained from all temperatures included in the actual circuit temperature obtained, and the target temperature can include the connector temperature, the bus temperature and the DC cable temperature, and the bus voltage corresponding to at least one target temperature is raised based on the target step size. When the adjusted target temperature is less than the target threshold value, the target step size is reduced, and the reduced target step size is determined as the fourth voltage raising value corresponding to the target temperature.

[0124] During the actual execution process, when the bus voltages corresponding to multiple target temperatures are raised based on the target step size, and the fourth voltage raising values ​​corresponding to each target temperature are obtained, the final fourth voltage raising value can be obtained based on the competition of the fourth voltage raising values, and then the target voltage raising value can be determined based on the final fourth voltage raising value, thereby raising the bus voltage of the photovoltaic storage system based on the target voltage raising value.

[0125] The competition may be a method of taking an average value or a maximum value, and in some embodiments, may also be a weighted average method, which is not limited in the present application.

[0126] It should be noted that when the bus voltage corresponding to multiple target temperatures greater than the target threshold in the actual circuit temperature is raised based on the target step size, and when the adjusted target temperature is less than the target threshold, the specific value of reducing the target step size is the same.

[0127] In some embodiments, the actual circuit temperature includes the temperature of the connector terminals of each device included in the photovoltaic storage system, the bus temperature of each bus, and the DC cable temperature of the DC cable; Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value may include: When the maximum plug-in terminal temperature among the plug-in terminal temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum plug terminal temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fifth voltage raising value corresponding to the maximum plug terminal temperature; When the maximum bus temperature among the bus temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum bus temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the sixth voltage raising value corresponding to the maximum bus temperature; When the DC cable temperature is greater than the target threshold, the bus voltage is increased based on the target step size; When the adjusted DC cable temperature is less than the target threshold, reducing the target step size, and determining the reduced target step size as the seventh voltage raising value corresponding to the DC cable temperature; Based on the fifth voltage boost value, the sixth voltage boost value, and the seventh voltage boost value, a fourth voltage boost value is determined.

[0128] In this embodiment, it can be understood that the maximum temperature of each plug terminal temperature and each bus temperature and the DC cable temperature can be obtained respectively. When the maximum temperature of each plug terminal temperature and each bus temperature and the DC cable temperature are respectively greater than the corresponding target thresholds, the bus voltage corresponding to the maximum temperature of each plug terminal temperature and each bus temperature and the DC cable temperature is raised based on the target step size, and when the adjusted maximum temperature of each plug terminal temperature and each bus temperature and the DC cable temperature are less than their respective corresponding target thresholds, the target step size is reduced, and the reduced target step size is determined as the voltage raise value corresponding to the maximum temperature of each plug terminal temperature and each bus temperature and the DC cable temperature, that is, the fifth voltage raise value corresponding to the maximum temperature of each plug terminal temperature, the sixth voltage raise value corresponding to the maximum temperature of each bus temperature and the seventh voltage raise value corresponding to the DC cable temperature, and then based on the obtained fifth voltage raise value, sixth voltage raise value and seventh voltage raise value, the fourth voltage raise value is competitively determined, and then based on the fourth voltage raise value, the target voltage raise value is determined.

[0129] In some embodiments, based on the fifth voltage boost value, the sixth voltage boost value and the seventh voltage boost value, the method of competitively determining the fourth voltage boost value can be similar to the above-mentioned case of raising the bus voltage corresponding to multiple target temperatures based on the target step size, which is not elaborated in this application.

[0130] In some embodiments, the actual circuit temperature includes the temperature of the connector terminals of each device included in the photovoltaic storage system, the bus temperature of each bus, and the DC cable temperature of the DC cable; Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value may include: When the maximum temperature in the actual circuit temperature is greater than the target threshold, the bus voltage corresponding to the maximum temperature is raised based on the target step size; When the adjusted maximum temperature is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum temperature.

[0131] In this embodiment, it can be understood that the maximum temperature can be determined among all the temperatures included in the actual circuit temperature obtained. The maximum temperature can be the connector temperature, the bus temperature or the DC cable temperature. When the maximum temperature is greater than the target threshold, the bus voltage corresponding to the maximum temperature is raised based on the target step size. When the adjusted maximum temperature is less than the target threshold, the target step size is reduced, and the reduced target step size is determined as the fourth voltage raise value corresponding to the maximum temperature, thereby determining the fourth voltage raise value as the target voltage raise value to raise the bus voltage of the photovoltaic storage system.

[0132] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, by further providing a plurality of methods for determining the target voltage raise value based on a closed-loop control algorithm based on the temperature of the connector terminals of each device, the bus temperature at each device bus sampling point and the DC cable temperature included in the actual circuit temperature when the sampling signal is the actual circuit temperature, the flexibility of determining the target voltage raise value can be further improved to provide users with a variety of options, further improve the bus voltage raised by the target voltage raise value, and thus reduce the adaptability and reliability of the temperature of each device in the photovoltaic storage system.

[0133] Second, closed-loop control when the sampling signal is the actual current In some embodiments, the actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value may include: Raising the bus voltage corresponding to at least one target current in the actual current that is greater than the target threshold based on the target step size; When the adjusted target current is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the target current; In this embodiment, it can be understood that a target current greater than each corresponding target threshold value can be obtained from all currents included in the actual current obtained, and the target current can include the bus current and the DC current of the DC cable, and the bus voltage corresponding to at least one target current is raised based on the target step size. When the adjusted target current is less than the target threshold value, the target step size is reduced, and the reduced target step size is determined as the fourth voltage raising value corresponding to the target current.

[0134] During the actual execution process, when the bus voltages corresponding to multiple target currents are raised based on the target step size, and the fourth voltage raise values ​​corresponding to each target current are obtained, the final fourth voltage raise value can be obtained based on the competition of the fourth voltage raise values, and then the target voltage raise value can be determined based on the final fourth voltage raise value, thereby raising the bus voltage of the photovoltaic storage system based on the target voltage raise value.

[0135] The competition may be a method of taking an average value or a maximum value, and in some embodiments, may also be a weighted average method, which is not limited in the present application.

[0136] It should be noted that when the bus voltage corresponding to multiple target currents greater than the target threshold in the actual current is raised based on the target step size, and when the adjusted target current is less than the target threshold, the specific value of reducing the target step size is the same.

[0137] In some embodiments, the actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value may include: When the maximum current in the actual current is greater than the target threshold, the bus voltage corresponding to the maximum current is raised based on the target step size; When the adjusted maximum current is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum current.

[0138] In this embodiment, it can be understood that the maximum current can be determined from all the currents included in the actual current obtained. The maximum current can be the bus current and the DC current of the DC cable. When the maximum current is greater than the target threshold, the bus voltage corresponding to the maximum current is raised based on the target step size. When the adjusted maximum current is less than the target threshold, the target step size is reduced, and the reduced target step size is determined as the fourth voltage raise value corresponding to the maximum current, thereby determining the fourth voltage raise value as the target voltage raise value to raise the bus voltage of the photovoltaic storage system.

[0139] According to the control method of the photovoltaic storage system provided in the embodiment of the present application, by further providing a plurality of methods for determining the target voltage raise value based on a closed-loop control algorithm based on the bus current of each device included in the actual current and the DC current of the DC cable when the sampling signal is the actual current, the flexibility of determining the target voltage raise value can be further improved to provide users with a variety of options, and the bus voltage can be raised by the target voltage raise value, thereby reducing the adaptability and reliability of the current of each device in the photovoltaic storage system.

[0140] like Figure 4 As shown, it should be noted that, in the case of raising the bus voltage of the photovoltaic storage system based on the above-mentioned closed-loop control algorithm, the sampling signal can include the actual circuit temperature and the actual current at the same time, and obtain the target voltage raising value corresponding to the actual circuit temperature included in the sampling signal and the target voltage raising value corresponding to the actual current included in the sampling signal based on the above process, and then obtain the final bus voltage raising value based on the target voltage raising value competition, so as to control the bus voltage of the photovoltaic storage system based on the final bus voltage raising value.

[0141] The control method of the photovoltaic storage system provided in the embodiment of the present application can be executed by a control device of the photovoltaic storage system. In the embodiment of the present application, the control device of the photovoltaic storage system performing the control method of the photovoltaic storage system is taken as an example to illustrate the control device of the photovoltaic storage system provided in the embodiment of the present application.

[0142] An embodiment of the present application also provides a control device for a photovoltaic storage system.

[0143] like Fig.12 As shown, the control device of the photovoltaic storage system includes: a first processing module 1210 and a second processing module 1220 .

[0144] The first processing module 1210 is used to obtain a sampling signal of the photovoltaic storage system, where the sampling signal includes an actual circuit temperature and / or an actual current corresponding to the photovoltaic storage system; The second processing module 1220 is used to raise the bus voltage of the photovoltaic energy storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal.

[0145] According to the control device of the photovoltaic storage system provided in the embodiment of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold value corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the possibility of selecting devices with lower current specifications, saving the device cost of the photovoltaic storage system, and reducing the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0146] In some embodiments, the second processing module 1220 may also be used to: Based on an open-loop control algorithm or a closed-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic energy storage system is raised.

[0147] In some embodiments, the second processing module 1220 may also be used to: Obtaining a target voltage lift value based on a preset relationship table; the preset relationship table is pre-constructed based on test data; Based on the target voltage increase value, the bus voltage of the photovoltaic energy storage system is increased.

[0148] In some embodiments, the second processing module 1220 may also be used to: The actual circuit temperature includes the connector terminal temperature of each device included in the photovoltaic storage system, the bus temperature of each bus and the DC cable temperature of the DC cable; based on at least one of the connector terminal temperature, the bus temperature and the DC cable temperature, a preset relationship table is queried to determine the target voltage lift value.

[0149] In some embodiments, the second processing module 1220 may also be used to: Obtaining candidate voltage lift values ​​corresponding to each target temperature greater than a target threshold value in the actual circuit temperature based on a preset relationship table; Determining a target voltage boost value based on each candidate voltage boost value; or, Querying a preset relationship table to obtain a first voltage rise value corresponding to a maximum plug-in terminal temperature among the plug-in terminal temperatures; Query the preset relationship table to obtain the second voltage lift value corresponding to the maximum bus temperature among the bus temperatures; Query the preset relationship table to obtain the third voltage rise value corresponding to the DC cable temperature; Determining a target voltage boost value based on the first voltage boost value, the second voltage boost value, and the third voltage boost value; or, The maximum temperature of the actual circuit temperature is obtained, and a preset relationship table is queried based on the maximum temperature to obtain a target voltage increase value.

[0150] In some embodiments, the second processing module 1220 may also be used to: The actual current includes the bus current of each device included in the PV storage system and the DC current of the DC cable; Obtaining candidate voltage lift values ​​corresponding to each target current greater than a target threshold value in the actual current based on a preset relationship table; Determining a target voltage boost value based on each candidate voltage boost value; or, The maximum current in the actual current is obtained, and the preset relationship table is queried based on the maximum current to obtain the target voltage lift value.

[0151] In some embodiments, the second processing module 1220 may also be used to: Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value; Determining a target voltage boost value based on each fourth voltage boost value; Based on the target voltage increase value, the bus voltage of the photovoltaic energy storage system is increased.

[0152] In some embodiments, the second processing module 1220 may also be used to: The actual circuit temperature includes the temperature of the connectors of each device included in the PV storage system, the busbar temperature of each busbar, and the DC cable temperature of the DC cable; Raising the bus voltage corresponding to at least one target temperature greater than a target threshold value among the actual circuit temperatures based on the target step size; When the adjusted target temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value corresponding to the target temperature; or, When the maximum plug-in terminal temperature among the plug-in terminal temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum plug terminal temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fifth voltage raising value corresponding to the maximum plug terminal temperature; When the maximum bus temperature among the bus temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum bus temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the sixth voltage raising value corresponding to the maximum bus temperature; When the DC cable temperature is greater than the target threshold, the bus voltage is increased based on the target step size; When the adjusted DC cable temperature is less than the target threshold, reducing the target step size, and determining the reduced target step size as the seventh voltage raising value corresponding to the DC cable temperature; determining a fourth voltage boost value based on the fifth voltage boost value, the sixth voltage boost value, and the seventh voltage boost value; or, When the maximum temperature in the actual circuit temperature is greater than the target threshold, the bus voltage corresponding to the maximum temperature is raised based on the target step size; When the adjusted maximum temperature is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum temperature.

[0153] In some embodiments, the second processing module 1220 may also be used to: The actual current includes the bus current of each device included in the PV storage system and the DC current of the DC cable; Raising the bus voltage corresponding to at least one target current in the actual current that is greater than the target threshold based on the target step size; When the adjusted target current is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the target current; or, When the maximum current in the actual current is greater than the target threshold, the bus voltage corresponding to the maximum current is raised based on the target step size; When the adjusted maximum current is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum current.

[0154] The control device of the optical storage 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.

[0155] The control device of the photovoltaic storage system provided in the embodiment of the present application can achieve Figures 1 to 11 To avoid repetition, the various processes implemented by the method embodiment are not described here.

[0156] like Figure 6 and Figure 7 As shown, an embodiment of the present application also provides a photovoltaic system.

[0157] In this embodiment, the photovoltaic system includes: a photovoltaic module, a photovoltaic storage inverter, an energy storage module and a DC bus control device.

[0158] Among them, photovoltaic modules are used for photovoltaic power generation.

[0159] The photovoltaic storage inverter is electrically connected to the photovoltaic module, and the photovoltaic storage inverter is used to access the power grid.

[0160] The energy storage module is connected to the photovoltaic inverter via connectors and / or DC cables.

[0161] The energy storage module may include multiple battery packs to store electrical energy and release the energy when needed.

[0162] The battery packs included in the energy storage module can be connected via connector terminals.

[0163] The DC bus control device is electrically connected to the photovoltaic storage inverter and the energy storage module respectively.

[0164] The DC bus control device controls the bus voltage of the photovoltaic system based on the control method of the photovoltaic storage system described in any of the above embodiments.

[0165] According to the photovoltaic system provided in the embodiment of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is raised, and the bus current of the photovoltaic storage system can be reduced, thereby achieving the ability to select devices with lower current specifications, save the cost of photovoltaic storage system devices, and reduce the temperature of the device corresponding to the sampling signal without derating the photovoltaic storage system, thereby reducing the risk of over-temperature protection of the photovoltaic storage system, improving the internal charging and discharging power stability of the photovoltaic storage system, and when the photovoltaic storage system includes a DC load, improving the stability of the charging power output of the photovoltaic storage system to the DC load, improving the charging efficiency, and thus enhancing the user experience.

[0166] like Figure 8 As shown, in some embodiments, the photovoltaic system further includes: a DC load.

[0167] In this embodiment, the DC load is arranged between the photovoltaic energy storage inverter and the energy storage module in an integrated or split manner, and the DC load is connected via connector terminals and / or DC cables.

[0168] Among them, Figure 8 As shown, the integrated type can be understood as a DC load connected between the photovoltaic inverter and the energy storage module through a plug-in terminal.

[0169] like Fig. 9 , Fig.10 and Fig.11 As shown, the split type can be understood as a DC load connected between the photovoltaic inverter and the energy storage module through a DC cable and a connector.

[0170] According to the photovoltaic system provided in the embodiment of the present application, by setting the DC load between the photovoltaic storage inverter and the energy storage module in an integrated or split setting manner, a variety of setting methods of the DC load can be implemented, thereby improving the flexibility of the setting method.

[0171] In some embodiments, the DC bus control device may include a plurality of regulators, the plurality of regulators are arranged in one-to-one correspondence with the sampling signals, and the plurality of regulators are used to adjust the corresponding sampling signals.

[0172] According to the photovoltaic system provided in the embodiment of the present application, by setting multiple regulators corresponding to the sampling signals in the DC bus control device, it is possible to achieve refined control of each sampling signal and improve the control accuracy of the bus voltage of the photovoltaic storage system.

[0173] like Figure 4 As shown, in some embodiments, the DC bus control device may include: At least one of the temperature control device and the current control device and an integrated control device, wherein the input end of the integrated control device is electrically connected to the output ends of the temperature control device and the current control device respectively.

[0174] In this embodiment, the temperature control device is used to control the actual circuit temperature included in the sampling signal.

[0175] The current control device is used to control the actual current included in the sampling signal.

[0176] The integrated control device is used to comprehensively process the target voltage increase value output by the temperature control device and / or the target voltage increase value output by the current control device, and output a final bus voltage increase value, which is used to control the bus voltage of the photovoltaic storage system.

[0177] According to the photovoltaic system provided in the embodiment of the present application, through at least one of the temperature control device and the current control device, and an integrated control device whose input end is electrically connected to the output end of the temperature control device and the current control device respectively, it is possible to obtain the target voltage boost value corresponding to the actual circuit temperature included in the sampling signal, as well as the target voltage boost value corresponding to the actual current included in the sampling signal, and obtain the final bus voltage boost value. Based on the steps of obtaining multiple bus voltage boost values, the accuracy and reliability of the final bus voltage boost value obtained can be achieved.

[0178] In some embodiments, Fig.13As shown, an embodiment of the present application also provides an electronic device 1300, including a processor 1301, a memory 1302, and a computer program stored in the memory 1302 and executable on the processor 1301. When the program is executed by the processor 1301, each process of the control method embodiment of the above-mentioned optical storage system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0179] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0180] An embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the various processes of the control method embodiment of the above-mentioned optical storage system are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0181] 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.

[0182] An embodiment of the present application further provides a computer program product, including a computer program, which implements the control method of the above-mentioned optical storage system when executed by a processor.

[0183] 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.

[0184] 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 above-mentioned control method embodiment of the optical storage system, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0185] 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.

[0186] 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.

[0187] 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 relevant technology, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, disk, CD), and includes a number of instructions for a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0188] 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.

[0189] 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.

[0190] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control method for a photovoltaic storage system, characterized in that: include: Acquiring a sampling signal of the photovoltaic storage system, wherein the sampling signal includes an actual circuit temperature and / or an actual current corresponding to the photovoltaic storage system; When the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is increased.

2. The control method of the photovoltaic storage system according to claim 1, characterized in that: When the sampling signal is greater than a target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system includes: Based on an open-loop control algorithm or a closed-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, the bus voltage of the photovoltaic storage system is increased.

3. The control method of the photovoltaic storage system according to claim 2, characterized in that: Based on the open-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system includes: Obtaining a target voltage lift value based on a preset relationship table; the preset relationship table is pre-constructed based on test data; Based on the target voltage raising value, the bus voltage of the photovoltaic energy storage system is raised.

4. The control method of the photovoltaic storage system according to claim 3, characterized in that: The actual circuit temperature includes the temperature of the connector terminals of each device included in the solar storage system, the bus temperature of the bus sampling point of each device, and the DC cable temperature of the DC cable; The step of obtaining the target voltage raising value based on the preset relationship table includes: Based on at least one of the connector terminal temperature, the busbar temperature and the DC cable temperature, the preset relationship table is queried to determine the target voltage raising value.

5. The control method of the photovoltaic storage system according to claim 4, characterized in that: The step of querying the preset relationship table based on at least one of the connector terminal temperature, the busbar temperature, and the DC cable temperature to determine the target voltage raising value includes: Acquire, based on the preset relationship table, candidate voltage lift values ​​corresponding to each target temperature in the actual circuit temperature that is greater than the target threshold; Determining the target voltage boost value based on each of the candidate voltage boost values; or, Query the preset relationship table to obtain a first voltage lift value corresponding to the maximum plug-in terminal temperature among the plug-in terminal temperatures; Query the preset relationship table to obtain a second voltage lift value corresponding to the maximum bus temperature among the bus temperatures; Query the preset relationship table to obtain a third voltage rise value corresponding to the DC cable temperature; Determining the target voltage boost value based on the first voltage boost value, the second voltage boost value, and the third voltage boost value; or, The maximum temperature among the actual circuit temperatures is obtained, and the preset relationship table is queried based on the maximum temperature to obtain the target voltage raising value.

6. The control method of the photovoltaic storage system according to claim 3, characterized in that: The actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; The step of obtaining the target voltage raising value based on the preset relationship table includes: Acquire, based on the preset relationship table, candidate voltage lift values ​​corresponding to each target current in the actual current that is greater than the target threshold; Determining the target voltage boost value based on each of the candidate voltage boost values; or, The maximum current in the actual current is obtained, and the preset relationship table is queried based on the maximum current to obtain the target voltage raising value.

7. The control method of the photovoltaic storage system according to claim 2, characterized in that: Based on the closed-loop control algorithm, when the sampling signal is greater than a target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system includes: Raising the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step length until the adjusted sampling signal is less than the target threshold, reducing the target step length, and determining the reduced target step length as a fourth voltage raising value; Determining a target voltage boost value based on each of the fourth voltage boost values; Based on the target voltage raising value, the bus voltage of the photovoltaic energy storage system is raised.

8. The control method of the photovoltaic storage system according to claim 7, characterized in that: The actual circuit temperature includes the temperature of the connector terminals of each device included in the solar storage system, the bus temperature of the bus sampling point of each device, and the DC cable temperature of the DC cable; The bus voltage corresponding to the sampling signal that is greater than the target threshold is raised based on the target step length until the adjusted sampling signal is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value, including: Raising the bus voltage corresponding to at least one target temperature of the actual circuit temperatures that is greater than the target threshold based on the target step size; When the adjusted target temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value corresponding to the target temperature; or, When the maximum plug-in terminal temperature among the plug-in terminal temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum plug terminal temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fifth voltage raising value corresponding to the maximum plug terminal temperature; When the maximum bus temperature among the bus temperatures is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted maximum bus temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the sixth voltage raising value corresponding to the maximum bus temperature; When the DC cable temperature is greater than the target threshold, raising the bus voltage based on the target step size; When the adjusted DC cable temperature is less than the target threshold, reducing the target step length, and determining the reduced target step length as the seventh voltage raising value corresponding to the DC cable temperature; determining the fourth voltage boost value based on the fifth voltage boost value, the sixth voltage boost value and the seventh voltage boost value; or, When a maximum temperature among the actual circuit temperatures is greater than the target threshold, raising a bus voltage corresponding to the maximum temperature based on the target step size; When the adjusted maximum temperature is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum temperature.

9. The control method of the photovoltaic storage system according to claim 7, characterized in that: The actual current includes the bus current of each device included in the photovoltaic storage system and the DC current of the DC cable; The bus voltage corresponding to the sampling signal that is greater than the target threshold is raised based on the target step length until the adjusted sampling signal is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value, including: Raising the bus voltage corresponding to at least one target current of the actual current that is greater than the target threshold based on the target step size; When the adjusted target current is less than the target threshold, reducing the target step length, and determining the reduced target step length as the fourth voltage raising value corresponding to the target current; or, When the maximum current in the actual current is greater than the target threshold, raising the bus voltage corresponding to the maximum current based on the target step size; When the adjusted maximum current is less than the target threshold, the target step length is reduced, and the reduced target step length is determined as the fourth voltage raising value corresponding to the maximum current.

10. A control device for a photovoltaic storage system, characterized in that: include: A first processing module, configured to obtain a sampling signal of the photovoltaic storage system, wherein the sampling signal includes an actual circuit temperature and / or an actual current corresponding to the photovoltaic storage system; The second processing module is used to raise the bus voltage of the photovoltaic storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal.

11. A photovoltaic system, characterized in that: include: Photovoltaic modules; A photovoltaic storage inverter, the photovoltaic storage inverter is electrically connected to the photovoltaic module, and the photovoltaic storage inverter is used to access the power grid; An energy storage module, wherein the energy storage module is connected to the photovoltaic storage inverter via a connector and / or a DC cable; A DC bus control device, wherein the DC bus control device is electrically connected to the photovoltaic storage inverter and the energy storage module respectively, and the DC bus control device controls the bus voltage of the photovoltaic system based on the control method of the photovoltaic storage system according to any one of claims 1 to 9.

12. The photovoltaic system according to claim 11, characterized in that: Also includes: A DC load is arranged between the photovoltaic inverter and the energy storage module in an integrated or split manner, and the DC load is connected via the connector terminal and / or the DC cable.

13. The photovoltaic system according to claim 11 or 12, characterized in that: The DC bus control device includes a plurality of regulators, which are arranged in one-to-one correspondence with the sampling signals, and are used to adjust the corresponding sampling signals.

14. The photovoltaic system according to claim 11 or 12, characterized in that: The DC bus control device comprises: At least one of the temperature control device and the current control device and an integrated control device, wherein the input end of the integrated control device is electrically connected to the output ends of the temperature control device and the current control device respectively.

15. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the photovoltaic storage system as described in any one of claims 1 to 9 is implemented.

16. 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 photovoltaic storage system according to any one of claims 1 to 9 is implemented.

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