Control Method, Device, Photovoltaic System, Storage Medium and Computer Program Product of Photovoltaic Energy Storage System

Abstract

The present application discloses a control method, device, photovoltaic system, storage medium, and computer program product for a photovoltaic energy storage system, belonging to the field of photovoltaic systems. The control method of the photovoltaic energy storage system includes: obtaining a sampling signal of the photovoltaic energy storage system, where the sampling signal includes the actual circuit temperature and / or actual current corresponding to the photovoltaic energy storage system; and increasing the bus voltage of the photovoltaic energy storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal. The control method of the photovoltaic energy storage system in the present application can reduce the risk of over-temperature protection for the photovoltaic energy storage system without the need to derate the operation of the photovoltaic energy storage system, improve the stability of the charge and discharge power inside the photovoltaic energy storage system, and improve the stability of the charging power output of the photovoltaic energy storage system to a DC load and the charging efficiency when the photovoltaic energy storage system includes a DC load, thereby enhancing the user experience.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic systems, and particularly relates to a control method, device, photovoltaic system, storage medium, and computer program product for a photovoltaic energy storage system. Background Art

[0002] A DC-coupled photovoltaic energy storage system generally includes a photovoltaic module, an inverter, and an energy storage module. In some cases, it may also include a DC load (such as a charging pile). The buses 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 cables or busbars. For example, when the photovoltaic energy storage system includes a DC load and the DC pile is charging at high power, the photovoltaic, grid, and energy storage simultaneously supply power to the DC load. A large current flowing through the DC cables or busbars for a long time will cause the DC cables, busbars, or plug terminals to heat up, resulting in the equipment needing to operate at a derated power or shutting down due to overheating. In a more serious case, long-term heating will pose a safety hazard. In related technologies, when the system detects that the temperature of the equipment is too high, it will reduce the power of the system's DC busbar to lower the equipment temperature. However, this control strategy will reduce the charge and discharge 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] This application aims to solve at least one of the technical problems existing in the related technologies. Therefore, this application provides a control method, device, photovoltaic system, storage medium, and computer program product for a photovoltaic energy storage system, which can reduce the risk of over-temperature protection of the photovoltaic energy storage system, improve the stability of the charge and discharge power inside the photovoltaic energy storage system, and when the photovoltaic energy storage system includes a DC load, improve the stability of the charging power output of the photovoltaic energy storage system to the DC load, improve the charging efficiency, and thus enhance the user experience, without the need to derate the operation of the photovoltaic energy storage system.

[0004] In a first aspect, this application provides a control method for a photovoltaic energy storage system, and the method includes:

[0005] Obtain a sampling signal of the photovoltaic energy storage system, where the sampling signal includes the actual circuit temperature and / or actual current corresponding to the photovoltaic energy storage system;

[0006] When the sampling signal is greater than the target threshold corresponding to the sampling signal, raise the bus voltage of the photovoltaic energy storage system.

[0007] According to the control method of the optical storage system of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the optical storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the optical storage system is increased, which can reduce the bus current of the optical storage system. Thus, it is possible to select devices with a lower current specification, save the device cost of the optical storage system, and without derating the operation of the optical storage system, reduce the temperature of the device corresponding to the sampling signal, reduce the risk of over-temperature protection of the optical storage system, improve the stability of the charge and discharge power inside the optical storage system, and when the optical storage system includes a DC load, improve the stability of the charging power output of the optical storage system to the DC load, improve the charging efficiency, and thus enhance the user experience.

[0008] According to an embodiment of the present application, when the sampling signal is greater than the target threshold corresponding to the sampling signal, increasing the bus voltage of the optical storage system includes:

[0009] 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, increase the bus voltage of the optical storage system.

[0010] 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, increasing the bus voltage of the optical storage system includes:

[0011] Obtain a target voltage increase value based on a preset relationship table; the preset relationship table is pre-constructed based on test data;

[0012] Based on the target voltage increase value, increase the bus voltage of the optical storage system.

[0013] According to an embodiment of the present application, the actual circuit temperature includes the plug terminal temperature of each device included in the optical storage system, the bus temperature of each device bus sampling point, and the DC cable temperature of the DC cable;

[0014] The obtaining a target voltage increase value based on a preset relationship table includes:

[0015] Based on at least one of the plug terminal temperature, the bus temperature, and the DC cable temperature, query the preset relationship table to determine the target voltage increase value.

[0016] According to an embodiment of the present application, the querying the preset relationship table based on at least one of the plug terminal temperature, the bus temperature, and the DC cable temperature to determine the target voltage increase value includes:

[0017] Obtain the corresponding candidate voltage boost values for each target temperature in the actual circuit temperature that is greater than the target threshold based on the preset relationship table;

[0018] Determine the target voltage boost value based on each of the candidate voltage boost values;

[0019] Or,

[0020] Query the preset relationship table to obtain the first voltage boost value corresponding to the maximum plug-in terminal temperature among each of the plug-in terminal temperatures;

[0021] Query the preset relationship table to obtain the second voltage boost value corresponding to the maximum bus temperature among each of the bus temperatures;

[0022] Query the preset relationship table to obtain the third voltage boost value corresponding to the DC cable temperature;

[0023] Determine the target voltage boost value based on the first voltage boost value, the second voltage boost value, and the third voltage boost value;

[0024] Or,

[0025] Obtain the maximum temperature in the actual circuit temperature, and query the preset relationship table based on the maximum temperature to obtain the target voltage boost value.

[0026] According to an embodiment of the present application, the actual current includes the bus current of each device included in the photovoltaic and energy storage system and the DC current of the DC cable;

[0027] The obtaining the target voltage boost value based on the preset relationship table includes:

[0028] Obtain the corresponding candidate voltage boost values for each target current in the actual current that is greater than the target threshold based on the preset relationship table;

[0029] Determine the target voltage boost value based on each of the candidate voltage boost values;

[0030] Or,

[0031] Obtain the maximum current in the actual current, and query the preset relationship table based on the maximum current to obtain the target voltage boost value.

[0032] 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, boosting the bus voltage of the photovoltaic and energy storage system includes:

[0033] Lift the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step until the adjusted sampling signal is less than the target threshold, then reduce the target step, and determine the reduced target step as the fourth voltage lift value;

[0034] Determine the target voltage lift value based on each of the fourth voltage lift values;

[0035] Lift the bus voltage of the photovoltaic and energy storage system based on the target voltage lift value.

[0036] According to an embodiment of the present application, the actual circuit temperature includes the plug-in terminal temperature of each device included in the photovoltaic and energy storage system, the bus temperature of each device bus sampling point, and the DC cable temperature of the DC cable;

[0037] The step of lifting the bus voltage corresponding to the sampling signal that is greater than the target threshold based on the target step until the adjusted sampling signal is less than the target threshold, then reducing the target step, and determining the reduced target step as the fourth voltage lift value includes:

[0038] Lift the bus voltage corresponding to at least one target temperature in the actual circuit temperature that is greater than the target threshold based on the target step;

[0039] When the adjusted target temperature is less than the target threshold, reduce the target step, and determine the reduced target step as the fourth voltage lift value corresponding to the target temperature;

[0040] Or,

[0041] When the maximum plug-in terminal temperature among the plug-in terminal temperatures is greater than the target threshold, lift the bus voltage based on the target step;

[0042] When the adjusted maximum plug-in terminal temperature is less than the target threshold, reduce the target step, and determine the reduced target step as the fifth voltage lift value corresponding to the maximum plug-in terminal temperature;

[0043] When the maximum bus temperature among the bus temperatures is greater than the target threshold, lift the bus voltage based on the target step;

[0044] When the adjusted maximum bus temperature is less than the target threshold, reduce the target step, and determine the reduced target step as the sixth voltage lift value corresponding to the maximum bus temperature;

[0045] When the DC cable temperature is greater than the target threshold, lift the bus voltage based on the target step;

[0046] When the temperature of the DC cable after regulation is less than the target threshold, reduce the target step size, and determine the reduced target step size as the seventh bus voltage boost value corresponding to the temperature of the DC cable;

[0047] Based on the fifth bus voltage boost value, the sixth bus voltage boost value, and the seventh bus voltage boost value, determine the fourth bus voltage boost value;

[0048] Or,

[0049] When the maximum temperature among the actual circuit temperatures is greater than the target threshold, boost the bus voltage corresponding to the maximum temperature based on the target step size;

[0050] When the maximum temperature after regulation is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fourth bus voltage boost value corresponding to the maximum temperature.

[0051] According to an embodiment of the present application, the actual current includes the bus current of each device included in the photovoltaic and energy storage system and the DC current of the DC cable;

[0052] The boosting the bus voltage corresponding to the sampling signal greater than the target threshold based on the target step size until the sampling signal after regulation is less than the target threshold, then reducing the target step size, and determining the reduced target step size as the fourth bus voltage boost value includes:

[0053] Based on the target step size, boost the bus voltage corresponding to at least one target current greater than the target threshold in the actual current;

[0054] When the target current after regulation is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fourth bus voltage boost value corresponding to the target current;

[0055] Or,

[0056] When the maximum current in the actual current is greater than the target threshold, boost the bus voltage corresponding to the maximum current based on the target step size;

[0057] When the maximum current after regulation is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fourth bus voltage boost value corresponding to the maximum current.

[0058] In a second aspect, the present application provides a control device for a photovoltaic and energy storage system, the device includes:

[0059] The first processing module is used to obtain the sampling signal of the photovoltaic and energy storage system, where the sampling signal includes the actual circuit temperature and / or the actual current corresponding to the photovoltaic and energy storage system;

[0060] The second processing module is used to raise the bus voltage of the photovoltaic and energy storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal.

[0061] According to the control device of the photovoltaic and energy storage system of the present application, by obtaining the sampling signal including the actual circuit temperature and / or the actual current corresponding to the photovoltaic and energy storage system, and raising the bus voltage of the photovoltaic and energy storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus current of the photovoltaic and energy storage system can be reduced. Thus, it is possible to select devices with a lower current specification, save the device cost of the photovoltaic and energy storage system, and reduce the temperature of the device corresponding to the sampling signal without derating the operation of the photovoltaic and energy storage system, reduce the risk of over-temperature protection of the photovoltaic and energy storage system, improve the stability of the charge and discharge power inside the photovoltaic and energy storage system, and improve the stability of the charging power output of the photovoltaic and energy storage system to the DC load and the charging efficiency when the photovoltaic and energy storage system includes a DC load, thereby enhancing the user experience.

[0062] In a third aspect, the present application provides a photovoltaic system, which includes:

[0063] A photovoltaic module;

[0064] A photovoltaic and energy storage inverter, which is electrically connected to the photovoltaic module and is used to connect to the power grid;

[0065] An energy storage module, which is connected to the photovoltaic and energy storage inverter through plug terminals and / or DC cables;

[0066] A DC bus control device, which is electrically connected to the photovoltaic and energy 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 and energy storage system as described in the first aspect.

[0067] For the photovoltaic system according to the present application, by acquiring a sampling signal including the actual circuit temperature and / or actual current corresponding to the energy storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the energy storage system is increased, which can reduce the bus current of the energy storage system. Thus, it is possible to select devices with a lower current specification, save the device cost of the energy storage system, and without derating the operation of the energy storage system, reduce the temperature of the device corresponding to the sampling signal, reduce the risk of over-temperature protection of the energy storage system, improve the stability of the charge and discharge power inside the energy storage system, and when the energy storage system includes a DC load, improve the stability of the charging power output of the energy storage system to the DC load, improve the charging efficiency, and thereby enhance the user experience.

[0068] According to an embodiment of the present application, it further includes:

[0069] A DC load, which is arranged between the photovoltaic inverter and the energy storage module through an integrated or split setting method, and the DC load is connected through the plug terminals and / or the DC cables.

[0070] According to an embodiment of the present application, the DC bus control device includes a plurality of regulators, and 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.

[0071] According to an embodiment of the present application, the DC bus control device includes:

[0072] At least one of a temperature control device and a current control device and an integrated control device, and 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.

[0073] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the control method of the energy storage system as described in the first aspect above.

[0074] In a fifth aspect, the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the control method of the energy storage system as described in the first aspect above.

[0075] One or more of the above technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0076] By obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic energy storage system, 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 raised, which can reduce the bus current of the photovoltaic energy storage system. Thus, when devices with lower current specifications can be selected to save the device cost of the photovoltaic energy storage system, without derating the operation of the photovoltaic energy storage system, the temperature of the device corresponding to the sampling signal can be reduced, the risk of over-temperature protection of the photovoltaic energy storage system can be reduced, the charging and discharging power stability inside the photovoltaic energy storage system can be improved, and when the photovoltaic energy storage system includes a DC load, the charging power output stability of the photovoltaic energy storage system to the DC load can be improved, and the charging efficiency can be improved, thereby enhancing the user experience.

[0077] Furthermore, by 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, the bus voltage of the photovoltaic energy storage system is raised, various control methods for raising the bus voltage can be realized, and the flexibility and adaptability of the control method can be improved.

[0078] Even further, by based on at least one of the temperature of the plug terminal, the bus temperature, and the DC cable temperature, querying a preset relationship table to determine the target voltage increase value, various determination methods for the target voltage increase value can be realized when the sampling signal is the actual circuit temperature, the flexibility of determining the target voltage increase value when the sampling signal is the actual circuit temperature can be improved, and thus the adaptability of the control method can be improved.

[0079] Still further, by using a closed-loop control algorithm, the bus voltage corresponding to the sampling signal 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 increase value. Then, based on each fourth voltage increase value, the target voltage increase value is determined. Thus, based on the target voltage increase value, the bus voltage of the photovoltaic energy storage system is raised, and a 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 realized, thereby improving the control accuracy and stability of the bus voltage of the photovoltaic energy storage system.

[0080] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0082] Figure 1 is a schematic flowchart of a control method for a photovoltaic energy storage system provided by an embodiment of the present application;

[0083] Figure 2 It is one of the schematic diagrams of the results of the control method of the optical storage system provided by the embodiments of the present application;

[0084] Figure 3 It is the second of the schematic diagrams of the results of the control method of the optical storage system provided by the embodiments of the present application;

[0085] Figure 4 It is one of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0086] Figure 5 It is the second of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0087] Figure 6 It is the third of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0088] Figure 7 It is the fourth of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0089] Figure 8 It is the fifth of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0090] Figure 9 It is the sixth of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0091] Figure 10 It is the seventh of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0092] Figure 11 It is the eighth of the schematic diagrams of the structure of the photovoltaic system provided by the embodiments of the present application;

[0093] Figure 12 It is the schematic diagram of the structure of the control device of the optical storage system provided by the embodiments of the present application;

[0094] Figure 13 It is the schematic diagram of the structure of the electronic device provided by the embodiments of the present application. Detailed implementation manners

[0095] Next, the technical solutions in the embodiments of the present application will be clearly described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0096] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0097] The following will combine the accompanying drawings and, through specific embodiments and their application scenarios, elaborate in detail on the control method of the optical storage system, the control device of the optical storage system, the photovoltaic system, and the readable storage medium provided by the embodiments of this application.

[0098] Among them, the control method of the optical storage system can be applied to a terminal, and specifically can be executed by hardware or software in the terminal.

[0099] The terminal includes but is not limited to portable communication devices such as mobile phones or tablets. It should also be understood that in some embodiments, the terminal may not be a portable communication device, but a desktop computer.

[0100] The control method of the optical storage system provided by the embodiments of this application, the execution subject of the control method of the optical storage system can be the optical storage system or a functional module or functional entity in the optical storage system that can implement the control method of the optical storage system. The following will take the optical storage system as the execution subject to illustrate the control method of the optical storage system provided by the embodiments of this application.

[0101] As Figure 1 shown, the control method of the optical storage system includes: step 110 and step 120.

[0102] Step 110, obtain the sampling signal of the optical storage system, and the sampling signal includes the actual circuit temperature and / or actual current corresponding to the optical storage system;

[0103] In this step, the optical storage system can be an optical storage system coupled to a DC bus, and can include a photovoltaic module and an optical storage unit, etc.

[0104] Among them, the photovoltaic module is used for photovoltaic power generation.

[0105] The optical storage unit can include an optical storage inverter and an energy storage module, etc.

[0106] The optical storage inverter is electrically connected to the photovoltaic module, and the optical storage inverter is used to connect to the power grid.

[0107] The energy storage module may include multiple battery packs for storing electrical energy and releasing energy when needed.

[0108] The energy storage module and the photovoltaic energy storage inverter can be connected through pluggable terminals, or through pluggable terminals and DC cables.

[0109] The battery packs included in the energy storage module can be connected through pluggable terminals.

[0110] In some embodiments, the photovoltaic energy storage unit may further include a DC load, such as a charging pile, etc.

[0111] In this embodiment, the DC load is arranged between the photovoltaic energy storage inverter and the energy storage module through an integrated or split setting method, and the DC load is connected through pluggable terminals and / or DC cables.

[0112] Among them, as Figure 8 shown, the integrated type can be understood as the DC load being connected between the photovoltaic energy storage inverter and the energy storage module through pluggable terminals.

[0113] As Figure 9 , Figure 10 and Figure 11 shown, the split type can be understood as the DC load being connected between the photovoltaic energy storage inverter and the energy storage module through DC cables and pluggable terminals.

[0114] The sampling signal is the actual circuit signal of the device or the device sampling point in the photovoltaic energy storage system.

[0115] Among them, the device may include pluggable terminals, DC buses, and DC cables, etc.

[0116] During the actual execution process, the sampling signal can be collected by sensors arranged at the device or the device sampling point.

[0117] The sampling signal may include at least one of the actual circuit temperature and the actual current.

[0118] In some embodiments, the actual circuit temperature may include the pluggable terminal temperature of each device, the bus temperature of the bus sampling point of each device, and the DC cable temperature, etc. Among them, the device may include the photovoltaic energy storage inverter and each battery pack. In the case where the photovoltaic energy storage system includes a DC load, the device may further include the DC load.

[0119] In some embodiments, the actual current may include the bus current of the bus sampling point of each device and the DC current of the DC cable, etc.

[0120] During the actual execution process, at the same moment, the sampling values of the device sampling signals corresponding to each device in the photovoltaic energy storage system may be different.

[0121] Step 120: When the sampled signal is greater than the target threshold corresponding to the sampled signal, raise the bus voltage of the photovoltaic energy storage system.

[0122] In this step, the target threshold may include a temperature threshold and a current threshold.

[0123] In some embodiments, when the sampled signal is the actual circuit temperature, the target threshold corresponding to the sampled signal is the temperature threshold; when the sampled signal is the actual current, the target threshold corresponding to the sampled signal is the current threshold.

[0124] In the actual execution process, the temperature threshold can be determined in advance based on test data, and the current threshold can be determined in advance based on the current specifications of each device.

[0125] Among them, the temperature thresholds corresponding to the respective temperatures included in the actual circuit temperature may be different, and the current thresholds corresponding to the respective currents included in the actual current may be different.

[0126] In the actual execution process, when the actual circuit temperature at a certain or certain device or equipment sampling point is greater than its corresponding temperature threshold, it may cause the photovoltaic energy storage system to derate or shut down due to overheating. In this case, the bus voltage of the photovoltaic energy storage system can be raised to reduce the bus current of the photovoltaic energy storage system, thereby reducing the temperature of the device corresponding to the sampled signal, without the need for the photovoltaic energy storage system to derate.

[0127] For example, as Figure 2 shown, assume that before the temperature of a certain device rises, the charge and discharge power of each battery pack coupled to the DC bus and the DC load power are relatively stable. As the operating time lengthens, the thermal accumulation effect causes the temperature of this device to exceed the temperature threshold at time t1. At this time, the bus voltage begins to rise. As the bus voltage rises, the current flowing through the DC busbar begins to decrease. After a period of time, the device temperature begins to decrease. Until time t2, the device temperature drops to near the temperature threshold. After short-term fluctuation adjustment, the bus voltage rise stabilizes near △Vbus. It can be seen that after the device temperature rises, the system does not need to derate, and only needs to raise the DC bus to continue to maintain the system to work at a constant power.

[0128] In some embodiments, when the current threshold of the actual current is the current specification of each device, in the actual execution process, when the actual current at a certain or certain device or equipment sampling point is greater than the current specification corresponding to each device, it may cause harm to the device itself. Then, the bus voltage of the photovoltaic energy storage system can be raised to reduce the current of the photovoltaic energy storage system, so that the current of each device or each device sampling point is less than its corresponding current threshold, so that in the actual application process, devices with a smaller current specification can be used, saving device costs and not affecting the operating efficiency and device safety of the photovoltaic energy storage system.

[0129] For example, as Figure 3 shown, assume that before t1, the bus current is lower than the bus bar current specification. At t1, the power reference of the system rises. As the system power rises, the DC bus current starts to increase. At t2, the DC bus current exceeds the bus bar current specification. At this time, the bus voltage starts to rise. Subsequently, the actual power rises rapidly. After the bus bar current reaches the maximum value at t3, it starts to decrease. After a short adjustment, the bus bar current is maintained near the current specification. It can be seen that by raising the DC bus bar voltage, the DC bus bar current can be prevented from exceeding the bus bar current specification when the system power increases.

[0130] In some embodiments, the bus voltage of the photovoltaic and energy storage system can be raised based on a DC bus control device electrically connected to the photovoltaic and energy storage inverter and the energy storage module respectively.

[0131] In this embodiment, as Figure 5 shown, the DC bus control device can receive the sampling signals of each device or each device sampling point of the photovoltaic and energy storage inverter and the energy storage module, so as to obtain the bus voltage rise value of the photovoltaic and energy storage system, and transmit the bus voltage rise value to the photovoltaic and energy storage inverter, so as to realize the control of the bus voltage of the photovoltaic and energy storage system.

[0132] The inventor found during the R & D process that a DC-coupled photovoltaic and energy storage system generally includes a photovoltaic module, an inverter and an energy storage module. In some cases, it may also include a DC load (such as a charging pile). The buses are connected by DC cables or bus bars. There is power flow between each device. Therefore, there is often a relatively large current on the DC cable or bus bar. For example, when the photovoltaic and energy storage system includes a DC load, when the DC pile charges at high power, the photovoltaic, the grid and the energy storage provide power to the DC load at the same time. The long-term flow of a large current on the DC cable or bus bar will cause the DC cable, bus bar or plug-in terminal to heat up, resulting in the device needing to derate or shut down due to overheating. In a more serious case, the long-term heating will pose a safety hazard. In the related art, when the system detects that the device temperature is too high, it will reduce the power of the system DC bus bar to reduce the device temperature. However, this control strategy will reduce the charge and discharge speed of the internal energy storage unit of the system or the charging speed of the DC charging pile, prolong the charging time, and affect the user experience.

[0133] In this application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the energy storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the energy storage system is increased, which can reduce the bus current of the energy storage system. Thus, it is possible to select devices with a lower current specification, save the device cost of the energy storage system, and without derating the operation of the energy storage system, reduce the temperature of the device corresponding to the sampling signal, reduce the risk of over-temperature protection of the energy storage system, improve the stability of the internal charge and discharge power of the energy storage system, and when the energy storage system includes a DC load, improve the stability of the charging power output of the energy storage system to the DC load, improve the charging efficiency, and thus enhance the user experience.

[0134] According to the control method of the energy storage system provided by the embodiment of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the energy storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the energy storage system is increased, which can reduce the bus current of the energy storage system. Thus, it is possible to select devices with a lower current specification, save the device cost of the energy storage system, and without derating the operation of the energy storage system, reduce the temperature of the device corresponding to the sampling signal, reduce the risk of over-temperature protection of the energy storage system, improve the stability of the internal charge and discharge power of the energy storage system, and when the energy storage system includes a DC load, improve the stability of the charging power output of the energy storage system to the DC load, improve the charging efficiency, and thus enhance the user experience.

[0135] In some embodiments, step 120 may include:

[0136] 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, the bus voltage of the energy storage system is increased.

[0137] 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.

[0138] The closed-loop control algorithm is an algorithm based on comparing the output signal with the desired output signal to obtain an error signal, and then aiming to reduce the error signal, adjusting the input signal based on the error signal so that the output signal approaches the desired output signal.

[0139] It can be understood that, based on either the open-loop control algorithm or the closed-loop control algorithm, the control process of increasing the bus voltage of the energy storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal can be realized.

[0140] According to the control method of the optical storage system provided by the embodiments of the present application, by 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, the bus voltage of the optical storage system is raised, and various control methods for raising the bus voltage can be realized, improving the flexibility and adaptability of the control method.

[0141] The following describes the specific method for raising the bus voltage of the optical storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal based on the open-loop control algorithm.

[0142] In some embodiments, 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 optical storage system may include:

[0143] Obtain the target voltage boost value based on a preset relationship table;

[0144] Based on the target voltage boost value, raise the bus voltage of the optical storage system.

[0145] In this embodiment, the voltage boost value is the bus voltage value for raising the bus voltage of the optical storage system.

[0146] The preset relationship table is a one-to-one correspondence table between multiple sampling values of the same sampling signal and multiple bus voltage boost values.

[0147] For example, in the preset relationship table of the temperature of a certain device's plug-in terminal, it includes temperature value 1, temperature value 2, and temperature value 3. Temperature value 1 corresponds to bus voltage boost value 1, temperature value 2 corresponds to bus voltage boost value 2, and temperature value 3 corresponds to bus voltage boost value 3.

[0148] It should be noted that in the preset relationship table, the larger the sampling signal, the larger the target voltage boost value; the smaller the sampling signal, the smaller the target voltage boost value.

[0149] In the actual execution process, each sampling signal corresponds to its own preset relationship table. For example, the temperature of each device's plug-in terminal corresponds to its own preset relationship table.

[0150] The preset relationship tables corresponding to each sampling signal can be constructed in advance based on test data.

[0151] It can be understood that the preset relationship tables corresponding to each sampling signal can be different.

[0152] The target voltage boost value is the voltage boost value corresponding to the sampling signal when the sampling signal is greater than the target threshold corresponding to the sampling signal.

[0153] During the actual execution process, the bus voltage of the photovoltaic and energy storage system can be lifted based on the target voltage lift value, which can reduce the bus current of the photovoltaic and energy storage system, so that the sampling signal corresponding to the target voltage lift value is less than the corresponding target threshold.

[0154] It should be noted that in open-loop control, the acquisition of the above target voltage lift value and the lifting of the bus voltage of the photovoltaic and energy storage system based on the target voltage lift 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 lift value is obtained in real time based on the preset relationship table, and the bus voltage of the photovoltaic and energy storage system is lifted based on the target voltage lift value.

[0155] For example, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the target voltage lift value 1 is obtained at time t1, and the bus voltage of the photovoltaic and energy storage system is lifted based on the target voltage lift value 1. When the sampling signal drops to a value less than the original sampling signal but not less than the target threshold at time t2, the target voltage lift value 2 is obtained, and the bus voltage of the photovoltaic and energy storage system is lifted based on the target voltage lift value 2.

[0156] It can be understood that the open-loop control algorithm is to obtain the target voltage lift value corresponding to each sampling signal according to the real-time obtained sampling signal to lift the bus voltage of the photovoltaic and energy storage system, rather than an algorithm that adjusts the target voltage lift value based on the feedback of the lifted bus voltage.

[0157] According to the control method of the photovoltaic and energy storage system provided by the embodiments of the present application, through the open-loop control algorithm, the target voltage lift value is obtained based on the preset relationship table, and the bus voltage of the photovoltaic and energy storage system is lifted based on the target voltage lift value, which can realize the real-time acquisition of the target voltage lift value in a look-up table manner, improve the acquisition efficiency of the control signal for lifting the bus voltage, and thus improve the control efficiency of the bus voltage of the photovoltaic and energy storage system based on the open-loop control algorithm.

[0158] 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, lifting the bus voltage of the photovoltaic and energy 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. These two cases will be described below.

[0159] First, open-loop control when the sampling signal is the actual circuit temperature

[0160] In some embodiments, the actual circuit temperature includes the plug terminal temperature of each device included in the photovoltaic and energy storage system, the bus temperature of each device bus sampling point, and the DC cable temperature of the DC cable; obtaining the target voltage lift value based on the preset relationship table may include:

[0161] Query a preset relationship table based on at least one of the plug-in terminal temperature, bus temperature, and DC cable temperature to determine the target voltage boost value.

[0162] In this embodiment, it can be understood that when the actual circuit temperature includes the plug-in terminal temperature of each device included in the photovoltaic energy storage system, the bus temperature of each device bus sampling point, and the DC cable temperature of the DC cable, there can be three cases: 1) When one of the plug-in terminal temperature, bus temperature, or DC cable temperature is greater than its corresponding temperature threshold, query the corresponding preset relationship table to determine the target voltage boost value; 2) When a combination of two of the plug-in terminal temperature, bus temperature, and DC cable temperature is greater than its corresponding temperature threshold, query the corresponding preset relationship table to determine the target voltage boost value; 3) When the plug-in terminal temperature, bus temperature, and DC cable temperature are greater than their corresponding temperature thresholds, query the corresponding preset relationship table to determine the target voltage boost value.

[0163] In the actual execution process, the process of querying the corresponding preset relationship table and determining the target voltage boost value is different in different cases.

[0164] According to the control method of the photovoltaic energy storage system provided by the embodiment of the present application, by querying a preset relationship table based on at least one of the plug-in terminal temperature, bus temperature, and DC cable temperature to determine the target voltage boost value, various determination methods of the target voltage boost value can be realized when the sampling signal is the actual circuit temperature, improving the flexibility of determining the target voltage boost value when the sampling signal is the actual circuit temperature, thereby improving the adaptability of the control method.

[0165] In some embodiments, querying a preset relationship table based on at least one of the plug-in terminal temperature, bus temperature, and DC cable temperature to determine the target voltage boost value may include:

[0166] Obtain the candidate voltage boost values corresponding to the target temperatures in the actual circuit temperature that are greater than the target threshold based on the preset relationship table;

[0167] Determine the target voltage boost value based on each candidate voltage boost value.

[0168] In this embodiment, the target temperature is the actual circuit temperature that is greater than the corresponding target threshold.

[0169] The candidate voltage boost value is the voltage boost value corresponding to each actual circuit temperature that is greater than the target threshold.

[0170] It can be understood that the target temperature greater than each corresponding target threshold can be obtained from all the temperatures included in the acquired actual circuit temperature. The target temperature can include the temperature of the plug terminal, the temperature of the bus bar, and the temperature of the DC cable. Then, based on the preset relationship table, the voltage boost value corresponding to each target temperature is obtained as the candidate voltage boost value, and the target voltage boost value is determined based on each candidate voltage boost value.

[0171] In the actual execution process, the target voltage boost value can be obtained through competition among the candidate voltage boost values.

[0172] Among them, the competition can be methods such as taking the average value or the maximum value. In some embodiments, it can also be the weighted average method, which is not limited in this application.

[0173] In some embodiments, querying the preset relationship table based on at least one of the temperature of the plug terminal, the temperature of the bus bar, and the temperature of the DC cable to determine the target voltage boost value may include:

[0174] Query the preset relationship table to obtain the first voltage boost value corresponding to the maximum plug terminal temperature among the plug terminal temperatures.

[0175] Query the preset relationship table to obtain the second voltage boost value corresponding to the maximum bus bar temperature among the bus bar temperatures.

[0176] Query the preset relationship table to obtain the third voltage boost value corresponding to the DC cable temperature.

[0177] Determine the target voltage boost value based on the first voltage boost value, the second voltage boost value, and the third voltage boost value.

[0178] In this embodiment, it can be understood that the maximum temperature among the plug terminal temperatures and the bus bar temperatures and the voltage boost value corresponding to the DC cable temperature can be obtained respectively, and then the target voltage boost value is determined based on the obtained voltage boost values.

[0179] In some embodiments, the manner 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 may be similar to the case of determining the target voltage boost value based on each candidate voltage boost value, which is not elaborated in this application.

[0180] In some embodiments, querying the preset relationship table based on at least one of the temperature of the plug terminal, the temperature of the bus bar, and the temperature of the DC cable to determine the target voltage boost value may include:

[0181] Obtain the maximum temperature in the actual circuit temperature, query the preset relationship table based on the maximum temperature, and obtain the target voltage boost value.

[0182] In this embodiment, it can be understood that the maximum temperature can be determined from all the temperatures included in the actually obtained circuit temperature. The maximum temperature can be the temperature of the plug terminal, the bus temperature, or the DC cable temperature. Then, based on the maximum temperature, the voltage boost value corresponding to the maximum temperature in the preset relationship table is queried, and the voltage boost value is determined as the target voltage boost value.

[0183] According to the control method of the optical storage system provided by the embodiments of the present application, when the sampling signal is the actual circuit temperature, based on the plug terminal temperatures of each device, the bus temperatures of the bus sampling points of each device, and the DC cable temperature included in the actual circuit temperature, various methods for determining the target voltage boost value based on the open-loop control algorithm are further provided, which can further improve the flexibility of determining the target voltage boost value, provide multiple options for users, and further improve the adaptability and reliability of boosting the bus voltage through the target voltage boost value to reduce the temperatures of each device in the optical storage system.

[0184] Second, open-loop control when the sampling signal is the actual current

[0185] In some embodiments, the actual current includes the bus current of each device included in the optical storage system and the DC current of the DC cable; obtaining the target voltage boost value based on the preset relationship table may include:

[0186] Obtaining the candidate voltage boost values corresponding to the target currents that are greater than the target threshold in the actual current based on the preset relationship table;

[0187] Determining the target voltage boost value based on each candidate voltage boost value;

[0188] In this embodiment, the target current is the actual current greater than the corresponding target threshold.

[0189] The candidate voltage boost value is the voltage boost value corresponding to each actual current greater than the target threshold.

[0190] 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. The target current greater than each corresponding target threshold can be obtained from all the currents included in the actually obtained actual current. The target current can include the bus current and the DC current of the DC cable, and the voltage boost value corresponding to each target temperature is obtained based on the preset relationship table as the candidate voltage boost value, and then the target voltage boost value is determined through competition based on each candidate voltage boost value.

[0191] In some embodiments, the actual current includes the bus current of each device included in the optical storage system and the DC current of the DC cable; obtaining the target voltage boost value based on the preset relationship table may include:

[0192] Obtain the maximum current in the actual current, query the preset relationship table based on the maximum current, and obtain the target voltage boost value.

[0193] In this embodiment, 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. Among all the currents included in the obtained actual current, the maximum current can be determined. The maximum current can be the bus current or the DC current of the DC cable. Then, based on the maximum current, query the voltage boost value corresponding to the maximum current in the preset relationship table, and determine the voltage boost value as the target voltage boost value.

[0194] According to the control method of the optical storage system provided by the embodiments of the present application, when the sampling signal is the actual current, based on the bus current of each device and the DC current of the DC cable included in the actual current, various determination methods of the target voltage boost value based on the open-loop control algorithm are further provided, which can further improve the flexibility of determining the target voltage boost value, provide multiple options for users, and improve the adaptability and reliability of boosting the bus voltage through the target voltage boost value to reduce the currents of each device in the optical storage system.

[0195] As Figure 4 shown, it should be noted that when boosting the bus voltage of the optical storage system based on the open-loop control algorithm, the sampling signal can include both the actual circuit temperature and the actual current, and the target voltage boost value corresponding to the actual circuit temperature included in the sampling signal, and the target voltage boost value corresponding to the actual current included in the sampling signal are respectively obtained based on the above process. Then, the final bus voltage boost value is obtained through competition based on the target voltage boost value, so as to control the bus voltage of the optical storage system based on the final bus voltage boost value.

[0196] Next, a specific method for boosting the bus voltage of the optical storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal based on the closed-loop control algorithm will be described.

[0197] In some embodiments, based on the closed-loop control algorithm, when the sampling signal is greater than the target threshold corresponding to the sampling signal, boosting the bus voltage of the optical storage system may include:

[0198] Boost the bus voltage corresponding to the sampling signal greater than the target threshold based on the target step size until the adjusted sampling signal is less than the target threshold, then reduce the target step size, and determine the reduced target step size as the fourth voltage boost value;

[0199] Determine the target voltage boost value based on each fourth voltage boost value;

[0200] Based on the target voltage boost value, boost the bus voltage of the photovoltaic and energy storage system.

[0201] In this embodiment, the target step is the boost value of the bus voltage corresponding to the sampling signal when the sampling signal is greater than the target threshold corresponding to the sampling signal in the closed-loop control.

[0202] During the actual execution process, the target step can be set by the user customarily.

[0203] For example, the target step can be set to 3V or 5V, etc.

[0204] During the actual execution process, the bus voltage corresponding to the sampling signal greater than the target threshold can be gradually boosted based on the target step until the adjusted sampling signal is less than the target threshold, and then the target step is decreased, and the decreased target step is determined as the fourth voltage boost value.

[0205] For example, assume that the sampling signal is a certain actual circuit temperature, the temperature threshold corresponding to this actual circuit temperature is 80°C, and the target step is set to 3V. If the actual circuit temperature is 90°C at a certain moment, which is greater than the temperature threshold, then the bus voltage corresponding to this actual circuit temperature is boosted with 3V as the target step. If the bus voltage before boosting is M, then for each boost, the bus voltage M corresponding to this actual circuit temperature will be increased by 3V on the basis of the previous boost. That is, after the first boost, the bus voltage corresponding to this actual circuit temperature is M + 3V; after the second boost, the bus voltage corresponding to this actual circuit temperature is M + 3V + 3V, and so on. After each boost, the actual circuit temperature will change correspondingly based on the adjusted bus voltage, and as the bus voltage is gradually boosted, the actual circuit temperature gradually decreases until it is less than the temperature threshold, and then the target step is decreased, and the decreased target step is determined as the fourth voltage boost value.

[0206] Among them, the specific value of decreasing the target step can be set by the user customarily. For example, when the target step is 3V, the specific value of decreasing the target step can be set to 1V or 2V, etc.

[0207] It can be understood that the closed-loop control algorithm is an algorithm that compares the sampling signal with the target threshold to generate an error signal, and then aims to reduce the error signal, and adjusts the target step based on the error signal to make the sampling signal approach the target threshold.

[0208] According to the control method of the optical storage system provided by the embodiments of the present application, through a closed-loop control algorithm, the bus voltage corresponding to the sampling signal greater than the target threshold is lifted based on the target step until the adjusted sampling signal is less than the target threshold, the target step is reduced, and the reduced target step is determined as the fourth voltage lift value. Then, based on each fourth voltage lift value, the target voltage lift value is determined, so that based on the target voltage lift value, the bus voltage of the optical storage system is lifted, and tracking feedback control of the change of the target step (control quantity) can be realized based on the sampling signal (feedback value) and the target threshold (reference value), thereby improving the accuracy and stability of the control of the bus voltage of the optical storage system.

[0209] First, the closed-loop control in the case where the sampling signal is the actual circuit temperature

[0210] In some embodiments, the actual circuit temperature includes the plug terminal temperature of each device included in the optical storage system, the bus temperature of each bus, and the DC cable temperature of the DC cable;

[0211] Lifting the bus voltage corresponding to the sampling signal greater than the target threshold based on the target step until after the adjusted sampling signal is less than the target threshold, reducing the target step, and determining the reduced target step as the fourth voltage lift value may include:

[0212] Lifting the bus voltage corresponding to at least one target temperature greater than the target threshold in the actual circuit temperature based on the target step;

[0213] In the case where the adjusted target temperature is less than the target threshold, reduce the target step, and determine the reduced target step as the fourth voltage lift value corresponding to the target temperature.

[0214] In this embodiment, it can be understood that the target temperature greater than each corresponding target threshold can be obtained from all the temperatures included in the obtained actual circuit temperature. The target temperature may include the plug terminal temperature, the bus temperature, and the DC cable temperature, and the bus voltage corresponding to at least one target temperature is lifted based on the target step. In the case where the adjusted target temperature is less than the target threshold, the target step is reduced, and the reduced target step is determined as the fourth voltage lift value corresponding to the target temperature.

[0215] In the actual execution process, in the case of lifting the bus voltages corresponding to multiple target temperatures based on the target step and obtaining each fourth voltage lift value corresponding to each target temperature, the final fourth voltage lift value can be obtained through competition based on each fourth voltage lift value, and then the target voltage lift value is determined based on the final fourth voltage lift value, so that the bus voltage of the optical storage system is lifted based on the target voltage lift value.

[0216] Among them, the competition can be methods such as taking the average value or the maximum value. In some embodiments, it can also be a weighted average method, which is not limited in this application.

[0217] It should be noted that when raising the bus voltages corresponding to multiple target temperatures greater than the target threshold in the actual circuit temperature based on the target step size, and when the adjusted target temperature is less than the target threshold, the specific values for reducing the target step size are the same.

[0218] In some embodiments, the actual circuit temperature includes the plug terminal temperatures of each device included in the photovoltaic and energy storage system, the bus temperatures of each bus, and the DC cable temperatures of the DC cables;

[0219] Raising the bus voltage corresponding to the sampling signal greater than the target threshold based on the target step size until the adjusted sampling signal is less than the target threshold, and then reducing the target step size, and determining the reduced target step size as the fourth voltage boost value may include:

[0220] When the maximum plug terminal temperature among the plug terminal temperatures is greater than the target threshold, raising the bus voltage based on the target step size;

[0221] When the adjusted maximum plug terminal temperature is less than the target threshold, reducing the target step size, and determining the reduced target step size as the fifth voltage boost value corresponding to the maximum plug terminal temperature;

[0222] 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;

[0223] When the adjusted maximum bus temperature is less than the target threshold, reducing the target step size, and determining the reduced target step size as the sixth voltage boost value corresponding to the maximum bus temperature;

[0224] When the DC cable temperature is greater than the target threshold, raising the bus voltage based on the target step size;

[0225] 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 boost value corresponding to the DC cable temperature;

[0226] Determining the fourth voltage boost value based on the fifth voltage boost value, the sixth voltage boost value, and the seventh voltage boost value.

[0227] In this embodiment, it can be understood that the maximum temperature among the temperatures of each plug terminal and each bus bar and the temperature of the DC cable can be obtained respectively. When the maximum temperature among the temperatures of each plug terminal and each bus bar and the temperature of the DC cable are respectively greater than the corresponding target thresholds, the bus bar voltage corresponding to the maximum temperature among the temperatures of each plug terminal and each bus bar and the temperature of the DC cable is increased based on the target step size. And when the adjusted maximum temperature among the temperatures of each plug terminal and each bus bar and the temperature of the DC cable is less than their respective target thresholds, the target step size is decreased, and the decreased target step size is determined as the voltage increase value corresponding to the maximum temperature among the temperatures of each plug terminal and each bus bar and the temperature of the DC cable, that is, the fifth voltage increase value corresponding to the maximum temperature among the temperatures of each plug terminal, the sixth voltage increase value corresponding to the maximum temperature among the temperatures of each bus bar, and the seventh voltage increase value corresponding to the temperature of the DC cable. Then, based on the obtained fifth voltage increase value, sixth voltage increase value, and seventh voltage increase value, the fourth voltage increase value is competitively determined, and then based on the fourth voltage increase value, the target voltage increase value is determined.

[0228] In some embodiments, the manner of competitively determining the fourth voltage increase value based on the fifth voltage increase value, sixth voltage increase value, and seventh voltage increase value can be similar to the case of increasing the bus bar voltage corresponding to multiple target temperatures based on the target step size as described above, and the present application will not elaborate herein.

[0229] In some embodiments, the actual circuit temperature includes the temperatures of the plug terminals of each device included in the photovoltaic and energy storage system, the bus bar temperatures of each bus bar, and the DC cable temperature of the DC cable;

[0230] Increasing the bus bar voltage corresponding to the sampling signal greater than the target threshold based on the target step size until the adjusted sampling signal is less than the target threshold, and then decreasing the target step size and determining the decreased target step size as the fourth voltage increase value may include:

[0231] When the maximum temperature in the actual circuit temperature is greater than the target threshold, the bus bar voltage corresponding to the maximum temperature is increased based on the target step size;

[0232] When the adjusted maximum temperature is less than the target threshold, the target step size is decreased, and the decreased target step size is determined as the fourth voltage increase value corresponding to the maximum temperature.

[0233] In this embodiment, it can be understood that the maximum temperature can be determined from all the temperatures included in the obtained actual circuit temperature. The maximum temperature can be the temperature of the plug terminal, the temperature of the bus bar, or the temperature of the DC cable. When the maximum temperature is greater than the target threshold, the bus bar voltage corresponding to the maximum temperature is increased based on the target step. When the adjusted maximum temperature is less than the target threshold, the target step is decreased, and the decreased target step is determined as the fourth voltage increase value corresponding to the maximum temperature, so as to determine the fourth voltage increase value as the target voltage increase value and increase the bus bar voltage of the energy storage system.

[0234] According to the control method of the energy storage system provided by the embodiments of the present application, when the sampling signal is the actual circuit temperature, based on the temperature of each device plug terminal, the bus bar temperature of each device bus bar sampling point, and the temperature of the DC cable included in the actual circuit temperature, various determination methods of the target voltage increase value based on the closed-loop control algorithm are further provided, which can further improve the flexibility of determining the target voltage increase value, provide multiple choices for users, and further improve the adaptability and reliability of reducing the temperatures of each device in the energy storage system by increasing the bus bar voltage through the target voltage increase value.

[0235] Second, closed-loop control when the sampling signal is the actual current

[0236] In some embodiments, the actual current includes the bus bar current of each device included in the energy storage system and the DC current of the DC cable;

[0237] Increasing the bus bar voltage corresponding to the sampling signal greater than the target threshold based on the target step until the adjusted sampling signal is less than the target threshold, then decreasing the target step, and determining the decreased target step as the fourth voltage increase value may include:

[0238] Increasing the bus bar voltage corresponding to at least one target current greater than the target threshold in the actual current based on the target step;

[0239] When the adjusted target current is less than the target threshold, decreasing the target step, and determining the decreased target step as the fourth voltage increase value corresponding to the target current;

[0240] In this embodiment, it can be understood that the target current greater than each corresponding target threshold can be obtained from all the currents included in the obtained actual current. The target current can include the bus bar current and the DC current of the DC cable, and the bus bar voltage corresponding to at least one target current is increased based on the target step. When the adjusted target current is less than the target threshold, the target step is decreased, and the decreased target step is determined as the fourth voltage increase value corresponding to the target current.

[0241] In the actual execution process, when the bus voltages corresponding to multiple target currents are lifted based on the target step and the fourth voltage lift values corresponding to the respective target currents are obtained, the final fourth voltage lift value can be obtained through competition based on the respective fourth voltage lift values, and then the target voltage lift value can be determined based on the final fourth voltage lift value, so as to lift the bus voltage of the photovoltaic and energy storage system based on the target voltage lift value.

[0242] Among them, the competition can be methods such as taking the average value or the maximum value. In some embodiments, it can also be a weighted average method, which is not limited in this application.

[0243] It should be noted that when the bus voltages corresponding to multiple target currents greater than the target threshold in the actual current are lifted based on the target step and the adjusted target current is less than the target threshold, the specific value of reducing the target step is the same.

[0244] In some embodiments, the actual current includes the bus currents of the respective devices included in the photovoltaic and energy storage system and the direct current of the direct current cable;

[0245] Lifting the bus voltage corresponding to the sampling signal greater than the target threshold based on the target step, until the adjusted sampling signal is less than the target threshold, then reducing the target step, and determining the reduced target step as the fourth voltage lift value may include:

[0246] When the maximum current in the actual current is greater than the target threshold, lift the bus voltage corresponding to the maximum current based on the target step;

[0247] When the adjusted maximum current is less than the target threshold, reduce the target step, and determine the reduced target step as the fourth voltage lift value corresponding to the maximum current.

[0248] In this embodiment, it can be understood that the maximum current can be determined among all the currents included in the obtained actual current. The maximum current can be the bus current and the direct current of the direct current cable. When the maximum current is greater than the target threshold, the bus voltage corresponding to the maximum current is lifted based on the target step. When the adjusted maximum current is less than the target threshold, the target step is reduced, and the reduced target step is determined as the fourth voltage lift value corresponding to the maximum current, so as to determine the fourth voltage lift value as the target voltage lift value and lift the bus voltage of the photovoltaic and energy storage system.

[0249] According to the control method of the optical storage system provided by the embodiment of the present application, when the sampling signal is the actual current, based on the bus current of each device included in the actual current and the direct current of the direct current cable, a variety of determination methods for the target voltage boost value based on the closed-loop control algorithm are further provided, which can further improve the flexibility of determining the target voltage boost value to provide multiple choices for users, and can further improve the adaptability and reliability of boosting the bus voltage through the target voltage boost value, thereby reducing the current of each device in the optical storage system.

[0250] As Figure 4 shown, it should be noted that in the case of boosting the bus voltage of the optical storage system based on the closed-loop control algorithm, the sampling signal can include both the actual circuit temperature and the actual current, and respectively obtain the target voltage boost value corresponding to the actual circuit temperature included in the sampling signal and the target voltage boost value corresponding to the actual current included in the sampling signal based on the above process, and then compete based on the target voltage boost value to obtain the final bus voltage boost value, so as to control the bus voltage of the optical storage system based on the final bus voltage boost value.

[0251] The control method of the optical storage system provided by the embodiment of the present application, the execution subject can be the control device of the optical storage system. In the embodiment of the present application, taking the control device of the optical storage system executing the control method of the optical storage system as an example, the control device of the optical storage system provided by the embodiment of the present application is described.

[0252] The embodiment of the present application also provides a control device for an optical storage system.

[0253] As Figure 12 shown, the control device of the optical storage system includes: a first processing module 1210 and a second processing module 1220.

[0254] The first processing module 1210 is used to obtain the sampling signal of the optical storage system, and the sampling signal includes the actual circuit temperature and / or the actual current corresponding to the optical storage system;

[0255] The second processing module 1220 is used to boost the bus voltage of the optical storage system when the sampling signal is greater than the target threshold corresponding to the sampling signal.

[0256] According to the control device of the optical storage system provided by the embodiments of the present application, by acquiring a sampling signal including the actual circuit temperature and / or actual current corresponding to the optical storage system, when the sampling signal is greater than the target threshold corresponding to the sampling signal, the bus voltage of the optical storage system can be raised, the bus current of the optical storage system can be reduced, so that components with a lower current specification can be selected, the cost of components of the optical storage system can be saved, and without the need to derate the operation of the optical storage system, the temperature of the components corresponding to the sampling signal can be reduced, the risk of over-temperature protection of the optical storage system can be reduced, the stability of the internal charge and discharge power of the optical storage system can be improved, and when the optical storage system includes a DC load, the stability of the charging power output of the optical storage system to the DC load can be improved, the charging efficiency can be improved, thereby enhancing the user experience.

[0257] In some embodiments, the second processing module 1220 may further be configured to:

[0258] 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, raise the bus voltage of the optical storage system.

[0259] In some embodiments, the second processing module 1220 may further be configured to:

[0260] Obtain a target voltage boost value based on a preset relationship table; the preset relationship table is pre-constructed based on test data;

[0261] Based on the target voltage boost value, raise the bus voltage of the optical storage system.

[0262] In some embodiments, the second processing module 1220 may further be configured to:

[0263] The actual circuit temperature includes the plug terminal temperature of each device included in the optical storage system, the bus temperature of each bus, and the DC cable temperature of the DC cable; based on at least one of the plug terminal temperature, the bus temperature, and the DC cable temperature, query the preset relationship table to determine the target voltage boost value.

[0264] In some embodiments, the second processing module 1220 may further be configured to:

[0265] Obtain candidate voltage boost values corresponding to each target temperature greater than the target threshold in the actual circuit temperature based on the preset relationship table;

[0266] Based on each candidate voltage boost value, determine the target voltage boost value;

[0267] Or,

[0268] Query the preset relationship table to obtain the first voltage boost value corresponding to the maximum plug terminal temperature among the plug terminal temperatures;

[0269] Query the preset relationship table to obtain the second voltage boost value corresponding to the maximum bus temperature among the bus temperatures;

[0270] Query the preset relationship table to obtain the third voltage boost value corresponding to the DC cable temperature;

[0271] Determine the target voltage boost value based on the first voltage boost value, the second voltage boost value, and the third voltage boost value;

[0272] Or,

[0273] Obtain the maximum temperature in the actual circuit temperature, and query the preset relationship table based on the maximum temperature to obtain the target voltage boost value.

[0274] In some embodiments, the second processing module 1220 may further be configured to:

[0275] The actual current includes the bus currents of the devices included in the photovoltaic and energy storage system and the DC current of the DC cable;

[0276] Obtain the candidate voltage boost values corresponding to the target currents greater than the target threshold in the actual current based on the preset relationship table;

[0277] Determine the target voltage boost value based on the candidate voltage boost values;

[0278] Or,

[0279] Obtain the maximum current in the actual current, and query the preset relationship table based on the maximum current to obtain the target voltage boost value.

[0280] In some embodiments, the second processing module 1220 may further be configured to:

[0281] Boost the bus voltage corresponding to the sampling signal greater than the target threshold based on the target step until the adjusted sampling signal is less than the target threshold, then reduce the target step, and determine the reduced target step as the fourth voltage boost value;

[0282] Determine the target voltage boost value based on the fourth voltage boost values;

[0283] Boost the bus voltage of the photovoltaic and energy storage system based on the target voltage boost value.

[0284] In some embodiments, the second processing module 1220 may further be configured to:

[0285] The actual circuit temperature includes the plug terminal temperatures of the devices included in the photovoltaic and energy storage system, the bus temperatures of the buses, and the DC cable temperatures of the DC cables;

[0286] Boost the bus voltage corresponding to at least one target temperature greater than the target threshold in the actual circuit temperature based on the target step;

[0287] When the adjusted target temperature is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fourth voltage boost value corresponding to the target temperature;

[0288] Or,

[0289] When the maximum plug terminal temperature among the temperatures of each plug terminal is greater than the target threshold, boost the bus voltage based on the target step size;

[0290] When the adjusted maximum plug terminal temperature is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fifth voltage boost value corresponding to the maximum plug terminal temperature;

[0291] When the maximum bus temperature among the temperatures of each bus is greater than the target threshold, boost the bus voltage based on the target step size;

[0292] When the adjusted maximum bus temperature is less than the target threshold, reduce the target step size, and determine the reduced target step size as the sixth voltage boost value corresponding to the maximum bus temperature;

[0293] When the DC cable temperature is greater than the target threshold, boost the bus voltage based on the target step size;

[0294] When the adjusted DC cable temperature is less than the target threshold, reduce the target step size, and determine the reduced target step size as the seventh voltage boost value corresponding to the DC cable temperature;

[0295] Determine the fourth voltage boost value based on the fifth voltage boost value, the sixth voltage boost value, and the seventh voltage boost value;

[0296] Or,

[0297] When the maximum temperature in the actual circuit temperature is greater than the target threshold, boost the bus voltage corresponding to the maximum temperature based on the target step size;

[0298] When the adjusted maximum temperature is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fourth voltage boost value corresponding to the maximum temperature.

[0299] In some embodiments, the second processing module 1220 may further be configured to:

[0300] The actual current includes the bus current of each device included in the photovoltaic and energy storage system and the DC current of the DC cable;

[0301] Boost the bus voltage corresponding to at least one target current greater than the target threshold in the actual current based on the target step size;

[0302] In the case that the adjusted target current is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fourth voltage boost value corresponding to the target current;

[0303] Or,

[0304] In the case that the maximum current in the actual current is greater than the target threshold, boost the bus voltage corresponding to the maximum current based on the target step size;

[0305] In the case that the adjusted maximum current is less than the target threshold, reduce the target step size, and determine the reduced target step size as the fourth voltage boost value corresponding to the maximum current.

[0306] The control device of the energy storage and photovoltaic system in the embodiments of the present application can be a device with an operating system. The operating system can be the Android operating system, can be the IOS operating system, or can also be other possible operating systems, which are not specifically limited in the embodiments of the present application.

[0307] The control device of the energy storage and photovoltaic system provided by the embodiments of the present application can implement Figures 1 to 11 each process implemented by the method embodiments. To avoid repetition, it will not be elaborated here.

[0308] As Figure 6 and Figure 7 shown, the embodiments of the present application also provide a photovoltaic system.

[0309] In this embodiment, the photovoltaic system includes: a photovoltaic module, a hybrid energy storage inverter, an energy storage module, and a DC bus control device.

[0310] Among them, the photovoltaic module is used for photovoltaic power generation.

[0311] The hybrid energy storage inverter is electrically connected to the photovoltaic module, and the hybrid energy storage inverter is used to connect to the power grid.

[0312] The energy storage module is connected to the hybrid energy storage inverter through plug-in terminals and / or DC cables.

[0313] The energy storage module can include multiple battery packs, which are used to store electrical energy and release energy when needed.

[0314] The battery packs included in the energy storage module can be connected through plug-in terminals.

[0315] The DC bus control device is electrically connected to the hybrid energy storage inverter and the energy storage module respectively.

[0316] The DC bus control device controls the bus voltage of the photovoltaic system based on the control method of the energy storage and photovoltaic system described in any of the above embodiments.

[0317] According to the photovoltaic system provided by the embodiments of the present application, by obtaining a sampling signal including the actual circuit temperature and / or actual current corresponding to the photovoltaic energy storage system, 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 raised, which can reduce the bus current of the photovoltaic energy storage system. Thus, it is possible to select devices with a lower current specification, save the device cost of the photovoltaic energy storage system, and without derating the operation of the photovoltaic energy storage system, reduce the temperature of the device corresponding to the sampling signal, reduce the risk of over-temperature protection of the photovoltaic energy storage system, improve the stability of the charge and discharge power inside the photovoltaic energy storage system, and when the photovoltaic energy storage system includes a DC load, improve the stability of the charging power output of the photovoltaic energy storage system to the DC load, improve the charging efficiency, and thus enhance the user experience.

[0318] As Figure 8 shown, in some embodiments, the photovoltaic system further includes: a DC load.

[0319] In this embodiment, the DC load is arranged between the photovoltaic energy storage inverter and the energy storage module through an integrated or split-type setting method, and the DC load is connected through plug terminals and / or DC cables.

[0320] Among them, as Figure 8 shown, the integrated type can be understood as that the DC load is connected between the photovoltaic energy storage inverter and the energy storage module through plug terminals.

[0321] As Figure 9 、 Figure 10 and Figure 11 shown, the split type can be understood as that the DC load is connected between the photovoltaic energy storage inverter and the energy storage module through DC cables and plug terminals.

[0322] According to the photovoltaic system provided by the embodiments of the present application, by arranging the DC load between the photovoltaic energy storage inverter and the energy storage module through an integrated or split-type setting method, various setting methods of the DC load can be realized, and the flexibility of the setting method can be improved.

[0323] In some embodiments, the DC bus control device may include a plurality of regulators, and 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.

[0324] According to the photovoltaic system provided by the embodiments of the present application, by arranging a plurality of regulators in one-to-one correspondence with the sampling signals in the DC bus control device, fine control of each sampling signal can be realized, and the control accuracy of the bus voltage of the photovoltaic energy storage system can be improved.

[0325] As Figure 4 shown, in some embodiments, the DC bus control device may include:

[0326] At least one of a temperature control device and a 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.

[0327] In this embodiment, the temperature control device is used to control the actual circuit temperature included in the sampling signal.

[0328] The current control device is used to control the actual current included in the sampling signal.

[0329] The integrated control device is used to comprehensively process the target voltage boost value output by the temperature control device and / or the target voltage boost value output by the current control device, and output the final bus voltage boost value, so as to be used for controlling the bus voltage of the photovoltaic energy storage system.

[0330] According to the photovoltaic system provided by 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 ends 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, the target voltage boost value corresponding to the actual current included in the sampling signal, and the final bus voltage boost value. Based on the steps of obtaining multiple bus voltage boost values, the accuracy and reliability of the obtained final bus voltage boost value are realized.

[0331] In some embodiments, as Figure 13 shown, the embodiment of the present application also provides an electronic device 1300, including a processor 1301, a memory 1302, and a computer program stored on the memory 1302 and executable on the processor 1301. When the program is executed by the processor 1301, it realizes each process of the control method embodiment of the above photovoltaic energy storage system, and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0332] It should be noted that the electronic device in the embodiment of the present application includes the above-mentioned mobile electronic device and non-mobile electronic device.

[0333] The 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, it realizes each process of the control method embodiment of the above photovoltaic energy storage system, and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0334] Wherein, the processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disk, etc.

[0335] An embodiment of the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements the control method of the above-mentioned optical storage system.

[0336] Wherein, the processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes computer-readable storage media such as computer read-only memory ROM, random access memory RAM, magnetic disks or optical discs, etc.

[0337] Another embodiment of the present application provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement each process of the control method embodiment of the above-mentioned optical storage system, and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0338] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system-on-chip, system chip, chip system or system-on-chip, etc.

[0339] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that 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 a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0340] Through the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented 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, in essence, or the part that contributes to the related technology, can be embodied in the form of a computer software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions to enable a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present application.

[0341] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

[0342] 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", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0343] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. 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 a target threshold corresponding to the sampling signal, raising the bus voltage of the photovoltaic storage system so that the sampling signal can be reduced without derating the photovoltaic storage system; 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, raising the bus voltage of the photovoltaic storage system; 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.

2. The control method of the photovoltaic storage system according to claim 1, 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.

3. The control method of the photovoltaic storage system according to claim 2, 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.

4. The control method of the photovoltaic storage system according to claim 3, 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.

5. The control method of the photovoltaic storage system according to claim 2, 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.

6. The control method of the photovoltaic storage system according to claim 1, 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.

7. The control method of the photovoltaic storage system according to claim 1, 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.

8. 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; A 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, so that the sampling signal can be reduced without derating the photovoltaic storage system; 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, raising the bus voltage of the photovoltaic storage system; 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.

9. 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 7.

10. The photovoltaic system according to claim 9, 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.

11. The photovoltaic system according to claim 9 or 10, 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.

12. The photovoltaic system according to claim 9 or 10, 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.

13. 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 7 is implemented.

14. 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 7 is implemented.

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