Photovoltaic string attenuation repairing equipment, control method thereof and readable storage medium

Abstract

The invention provides photovoltaic string attenuation repairing equipment, a control method thereof and a readable storage medium, and relates to the technical field of photovoltaic power generation. According to the invention, photovoltaic string attenuation repairing equipment is deployed between a plurality of photovoltaic strings of a photovoltaic power station and a power grid, so that when the photovoltaic power station is in a power generation limiting state, a to-be-repaired string and a repaired energy supply string are determined according to real-time performance attenuation values of the plurality of photovoltaic strings in a photovoltaic power generation process; and the electric energy generated by the repair energy supply string in the limited power generation state is transmitted to the to-be-repaired string for electric injection repair, so that the mutual electric injection repair function among a plurality of photovoltaic strings is realized by utilizing photovoltaic abandoned power generated by a photovoltaic power station in the limited power generation state directly on the outdoor use site of the photovoltaic strings. The method improves the photovoltaic string repair efficiency, reduces the string repair cost loss, avoids the influence on the normal operation of the photovoltaic power station, and facilitates the rapid realization of the large-scale photovoltaic module repair effect of the large-scale photovoltaic power station.

Description

Technical Field

[0001] This application relates to the field of photovoltaic power generation technology, and more specifically, to a photovoltaic string attenuation repair device, its control method, and a readable storage medium. Background Technology

[0002] With the continuous development of science and technology, photovoltaic power generation technology, which can convert solar radiation energy into electrical energy using the photovoltaic effect of semiconductor materials, has become a development direction of clean energy technology. However, in the actual application of photovoltaic power generation technology, photovoltaic modules deployed in outdoor environments often experience severe performance degradation under the influence of various environmental factors such as sunlight, temperature, humidity, and dust, affecting the overall power generation of the photovoltaic power station.

[0003] Currently, for photovoltaic (PV) modules exhibiting severe performance degradation, the modules need to be removed from their outdoor mounting brackets and sent to an indoor laboratory for electro-injection repair to restore them to the desired performance state. However, it's worth noting that this repair method relies on module removal and the use of grid-connected electro-injection equipment, resulting in low overall repair efficiency, significant cost losses, and a high risk of disrupting the normal operation of the PV power plant. Therefore, it is unsuitable for large-scale PV module repair scenarios in large-scale PV power plants. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a photovoltaic string attenuation repair device, a photovoltaic string attenuation repair control method, and a readable storage medium, which can directly utilize the photovoltaic curtailment generated by the photovoltaic power station under restricted power generation conditions at the outdoor use site of the photovoltaic string to realize the mutual electrical injection repair function between multiple photovoltaic strings, so as to improve the photovoltaic string repair efficiency, reduce the photovoltaic string repair cost loss, and avoid affecting the normal operation of the corresponding photovoltaic power station, and facilitate the rapid implementation of large-scale photovoltaic module repair effect for large photovoltaic power stations.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In a first aspect, this application provides a photovoltaic string attenuation repair device. The repair device includes a main control unit, an inverter monitoring circuit, a string mutual power injection unit, and multiple maximum power point tracking circuits. The power input terminals of each of the multiple maximum power point tracking circuits are individually connected to a photovoltaic string in a photovoltaic power station. The power output terminals of each of the multiple maximum power point tracking circuits are interconnected and connected to the power grid via a photovoltaic inverter. Each string connection terminal of the string mutual power injection unit is individually connected to the power output terminal of one of the maximum power point tracking circuits.

[0007] The inverter monitoring circuit is used to monitor the operating status of the photovoltaic inverter in real time to detect whether the photovoltaic power station is in a state of restricted power generation.

[0008] The main control unit is communicatively connected to multiple maximum power point tracking circuits, and is used to obtain the real-time maximum power generation of the photovoltaic strings connected to each of the multiple maximum power point tracking circuits during the photovoltaic power generation process, perform string performance degradation analysis, and obtain the real-time performance degradation value of the corresponding photovoltaic string during the photovoltaic power generation process.

[0009] The main control unit is also communicatively connected to the string mutual injection unit and the inverter monitoring circuit, respectively. When the photovoltaic power station is in a restricted power generation state, it determines the string to be repaired and the power supply string to be repaired among the multiple photovoltaic strings according to the real-time performance degradation value of each of the multiple photovoltaic strings, and controls the string mutual injection unit to transmit the electrical energy generated by the power supply string to the string to be repaired for electrical injection repair.

[0010] In an optional implementation, the string mutual power supply unit includes a plurality of first switches and a multi-directional DC-DC converter;

[0011] The multi-directional DC converter includes multiple conversion connection terminals, each of which is individually connected to one end of the first switch, and the other end of each first switch serves as a string connection terminal of the string mutual injection unit.

[0012] The main control unit controls the first switch connected to the string to be repaired and the repair power supply string to be turned on, and controls the multi-directional DC converter to convert the DC voltage signal output by the repair power supply string into a repair voltage state adapted to the string to be repaired and then inject it into the string to be repaired, so as to realize the electro-injection repair operation of the repair power supply string on the string to be repaired.

[0013] In an optional implementation, the string mutual power injection unit includes multiple second switches and at least one bidirectional DC-DC converter, wherein the power output terminals of any two maximum power point tracking circuits in the plurality of maximum power point tracking circuits are respectively connected to the two conversion connection terminals of the same bidirectional DC-DC converter via a second switch.

[0014] Specifically, for the bidirectional DC-DC converter that is simultaneously connected to the string to be repaired and the repair power supply string via a maximum power point tracking circuit, the main control unit controls the two second switches directly connected to the bidirectional DC-DC converter to be turned on, and controls the bidirectional DC-DC converter to convert the DC voltage signal output by the repair power supply string into a repair voltage state adapted to the string to be repaired and then inject it into the string to be repaired, so as to realize the electro-injection repair operation of the repair power supply string on the string to be repaired.

[0015] In an optional embodiment, the repair device further includes a battery repair control unit, the battery connection terminal of which is connected to an energy storage battery, and the multiple string connection terminals of the battery repair control unit are each individually connected to the power output terminal of the maximum power point tracking circuit.

[0016] The main control unit is also communicatively connected to the battery repair control unit, and is used to determine the string to be repaired among the multiple photovoltaic strings according to the real-time performance degradation value of each of the multiple photovoltaic strings when the photovoltaic power station is not in a restricted power generation state, and control the battery repair control unit to transfer the stored electrical energy of the energy storage battery to the string to be repaired for electrical injection repair.

[0017] In an optional implementation, the inverter monitoring circuit is also used to detect whether the photovoltaic power station is in a low-irradiance power generation state;

[0018] The power supply terminal of the battery repair control unit is connected to the input terminal of the photovoltaic inverter; wherein, when the photovoltaic power station is in a low-irradiance power generation state, the main control unit controls the battery repair control unit to transmit the stored electrical energy of the energy storage battery to the grid for power supply.

[0019] In an optional embodiment, the battery repair control unit includes a battery output control circuit, multiple third switches, and a mains power supply switch;

[0020] The battery input terminal of the battery output control circuit serves as the battery connection terminal of the battery repair control unit.

[0021] One end of each of the third switches serves as a string connection terminal of the battery repair control unit, and one end of the mains power supply switch serves as a cooperative power supply terminal of the battery repair control unit;

[0022] The other end of each of the third switches is connected to the voltage output terminal of the battery output control circuit, and the other end of the mains power supply switch is connected to the voltage output terminal of the battery output control circuit.

[0023] The main control unit controls the third switch connected to the string to be repaired to turn on, and controls the battery output control circuit to convert the DC voltage signal output by the energy storage battery into a repair voltage state adapted to the string to be repaired and inject it into the string to be repaired, so as to realize the electrical injection repair operation of the energy storage battery on the string to be repaired; the main control unit controls the grid power supply switch to turn on, so that the energy storage battery supplies power to the grid through the battery output control circuit.

[0024] Secondly, this application provides a photovoltaic string attenuation repair control method, applied to the photovoltaic string attenuation repair equipment described in any of the foregoing embodiments, the control method comprising:

[0025] The system detects whether the photovoltaic power station is in a restricted power generation state, and obtains the real-time maximum power generation of each of the multiple photovoltaic strings in the photovoltaic power station during the photovoltaic power generation process to perform string performance degradation analysis, thereby obtaining the real-time performance degradation value of each of the multiple photovoltaic strings during the photovoltaic power generation process.

[0026] When the photovoltaic power station is detected to be in a restricted power generation state, the photovoltaic string with the largest real-time performance degradation value is selected as the string to be repaired, and the photovoltaic string with the smallest real-time performance degradation value is selected as the power supply string to be repaired, based on the real-time performance degradation value of each of the multiple photovoltaic strings.

[0027] The control string mutual power injection unit transmits the electrical energy generated by the repair power supply string to the string to be repaired for electrical injection repair.

[0028] In an optional embodiment, where the photovoltaic string degradation repair device includes a battery repair control unit, the control method further includes:

[0029] If the photovoltaic power station is not in a restricted power generation state, it is detected whether the real-time performance degradation value of each of the multiple photovoltaic strings exceeds the preset degradation amplitude threshold.

[0030] Photovoltaic strings whose real-time performance degradation value exceeds the preset degradation magnitude threshold are identified as strings to be repaired, and the expected repair order of all strings to be repaired is determined.

[0031] According to the desired repair order, the battery repair control unit controls the battery to sequentially transfer the stored electrical energy of the energy storage battery to each string to be repaired for electrical injection repair.

[0032] In an optional implementation, the control method further includes:

[0033] If the photovoltaic power station is not in a restricted power generation state, then the system will detect whether the photovoltaic power station is in a low-irradiance power generation state.

[0034] When the photovoltaic power station is detected to be in a low-irradiance power generation state, the battery repair control unit controls the energy storage battery to transmit the stored energy to the power grid for power supply.

[0035] Thirdly, this application provides a readable storage medium storing a computer program thereon, which, when executed by the photovoltaic string attenuation repair device described in any of the foregoing embodiments, implements the photovoltaic string attenuation repair control method described in any of the foregoing embodiments.

[0036] In this case, the beneficial effects of the embodiments of this application may include the following:

[0037] This application deploys photovoltaic (PV) string attenuation repair equipment between multiple PV strings and the power grid in a PV power plant. When the PV power plant is under restricted power generation conditions, this equipment identifies the string to be repaired and the power supply string based on the real-time performance degradation values ​​of multiple PV strings during PV power generation. It then transmits the electrical energy generated by the power supply string under restricted power generation conditions (i.e., PV curtailment) to the string to be repaired for electrical injection repair. This allows for direct, on-site electrical injection repair of multiple PV strings using PV curtailment generated under restricted power generation conditions at the outdoor application site. This improves PV string repair efficiency, reduces repair costs, and avoids impacting the normal operation of the corresponding PV power plant. It facilitates rapid, large-scale PV module repair for large PV power plants.

[0038] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is one of the circuit schematic diagrams of the photovoltaic string attenuation repair device provided in the embodiments of this application;

[0041] Figure 2 for Figure 1 One of the schematic diagrams shown is of the components of a photovoltaic string attenuation repair device;

[0042] Figure 3 for Figure 1 The second schematic diagram shows the composition of the photovoltaic string attenuation repair equipment;

[0043] Figure 4 The second circuit diagram of the photovoltaic string attenuation repair device provided in the embodiments of this application;

[0044] Figure 5 for Figure 4 The diagram shows the composition of the photovoltaic string attenuation repair equipment.

[0045] Figure 6 This is one of the flowcharts illustrating the photovoltaic string attenuation repair and control method provided in the embodiments of this application;

[0046] Figure 7 The second schematic flowchart of the photovoltaic string attenuation repair control method provided in the embodiments of this application;

[0047] Figure 8 This is the third flowchart illustrating the photovoltaic string attenuation repair and control method provided in the embodiments of this application.

[0048] Icons: 10-PV string attenuation repair equipment; 11-Main control unit; 12-Maximum power point tracking circuit; 13-String mutual power injection unit; 14-Inverter monitoring circuit; 131-First switch; 132-Multi-directional DC-DC converter; 133-Second switch; 134-Bidirectional DC-DC converter; 15-Battery repair control unit; 151-Battery output control circuit; 152-Third switch; 153-Grid power supply switch. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0052] In the description of this application, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0053] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] Furthermore, it is understood in the description of this application that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features described herein can be combined with each other.

[0056] Please refer to Figure 1 , Figure 1 This is one of the circuit diagrams of the photovoltaic string attenuation repair device 10 provided in this application embodiment. In this application embodiment, the photovoltaic string attenuation repair device 10 is deployed in the field use scenario of a photovoltaic power station, and is used to connect multiple photovoltaic strings of the photovoltaic power station (e.g., Figure 1The system connects photovoltaic strings A, B, and C to the power grid. Even when the photovoltaic power station is in a restricted power generation state (i.e., the corresponding photovoltaic power station is required to suspend power supply to the grid), it utilizes the photovoltaic curtailment generated by the photovoltaic power station under restricted power generation (i.e., the electricity generated by the photovoltaic power station but restricted from being supplied to the grid). This allows for direct mutual electrical injection repair between multiple photovoltaic strings at the outdoor application site, improving repair efficiency, reducing repair costs, and avoiding disruption to the normal operation of the corresponding photovoltaic power station. This facilitates rapid, large-scale photovoltaic module repair for large photovoltaic power stations.

[0057] In this embodiment, the photovoltaic string attenuation repair device 10 may include a main control unit 11, an inverter monitoring circuit 14, a string mutual power injection unit 13, and multiple maximum power point tracking circuits 12, wherein the power input terminal of each of the multiple maximum power point tracking circuits 12 (i.e., Figure 1 The EI terminal of the photovoltaic power station is connected to a photovoltaic string, and the power output terminals of the multiple maximum power point tracking circuits 12 are respectively connected to the photovoltaic power station string. Figure 1 The photovoltaic (PV) inverter connects to the grid via interconnected terminals (EO terminals). Each maximum power point tracking (MPPT) circuit 12 ensures that the corresponding directly connected PV string supplies power to the grid at its real-time maximum power output during PV power generation. The input terminal of the PV inverter (i.e., the EO terminal) is connected to the grid via a photovoltaic inverter. Figure 1 The in terminal of the photovoltaic inverter is simultaneously connected to the power output terminals of each of the multiple maximum power point tracking circuits 12, and the output terminal of the photovoltaic inverter (i.e., the in terminal) is connected to the power output terminals of the multiple maximum power point tracking circuits 12. Figure 1 The out terminal of the circuit is connected to the power grid.

[0058] In this embodiment, the inverter monitoring circuit 14 is used to monitor the operating status of the photovoltaic inverter to detect whether the photovoltaic power station is in a limited power generation state. Specifically, the inverter monitoring circuit 14 can determine whether the photovoltaic power station is in a limited power generation state by real-time monitoring whether the actual output power of the photovoltaic inverter at the output terminal is greater than or equal to an output power threshold matching the limited power generation state. When the actual output power of the photovoltaic inverter is greater than or equal to the output power threshold matching the limited power generation state, it indicates that the photovoltaic inverter is continuously supplying power to the grid, and the photovoltaic power station is not in a limited power generation state. Conversely, when the actual output power of the photovoltaic inverter is less than the output power threshold matching the limited power generation state, it indicates that the photovoltaic inverter is not substantially supplying power to the grid, and the photovoltaic power station is in a limited power generation state.

[0059] In this embodiment, the main control unit 11 is communicatively connected to multiple maximum power point tracking circuits 12, and is used to acquire the real-time maximum power output of the photovoltaic strings connected to each of the multiple maximum power point tracking circuits 12 during the photovoltaic power generation process. Based on the acquired real-time maximum power output of each of the multiple photovoltaic strings, string performance degradation analysis is performed to obtain the real-time performance degradation value of the corresponding photovoltaic string during the photovoltaic power generation process. Specifically, for any photovoltaic string connected to a maximum power point tracking circuit 12, based on the actual operating conditions of the photovoltaic string's output real-time maximum power output, a target reference power output that matches the actual operating conditions can be found in the pre-stored reference power output data of the photovoltaic string under different operating conditions before leaving the factory. Then, the found target reference power output is compared with the corresponding real-time maximum power output to determine the power degradation of the corresponding real-time maximum power output relative to the target reference power output, thereby obtaining the real-time performance degradation value of the photovoltaic string.

[0060] In this embodiment of the application, the string interconnection unit 13 includes multiple string connection terminals (i.e. Figure 1 In the same photovoltaic string attenuation repair device 10, the number of string connection terminals of the string mutual power injection unit 13 is consistent with the number of maximum power point tracking circuits. Each string connection terminal of the string mutual power injection unit 13 is individually connected to the power output terminal of the maximum power point tracking circuit 12, so that each string connection terminal of the string mutual power injection unit 13 can be individually connected to a photovoltaic string of the photovoltaic power station through a maximum power point tracking circuit 12.

[0061] In this embodiment, the main control unit 11 is also communicatively connected to the string mutual injection unit 13 and the inverter monitoring circuit 14, respectively, for use when the inverter monitoring circuit 14 detects that the photovoltaic power station is in a limited power generation state, according to the multiple photovoltaic strings indirectly connected to the string mutual injection unit 13 (e.g., Figure 1 The real-time performance degradation values ​​of photovoltaic strings A, B, and C (indirectly connected to the string mutual power injection unit 13) are used to determine the strings to be repaired and the strings to be repaired from among the plurality of photovoltaic strings. The photovoltaic string to be repaired is preferentially selected as the one with the largest corresponding real-time performance degradation value, and the photovoltaic string to be repaired is preferentially selected as the one with the smallest corresponding real-time performance degradation value (e.g., ...). Figure 1 The photovoltaic string A has the smallest real-time performance degradation value, while the photovoltaic string C has the largest real-time performance degradation value. Therefore, photovoltaic string A can be selected as the repair power supply string, and photovoltaic string C can be selected as the string to be repaired. Figure 1Photovoltaic string A has the largest real-time performance degradation value, while photovoltaic string C has the smallest. Therefore, photovoltaic string C can be selected as the repair power supply string, and photovoltaic string A can be selected as the string to be repaired. Then, the main control unit 11 will control the string mutual power injection unit 13 to convert the electrical energy generated by the repair power supply string under the restricted power generation state (i.e., photovoltaic curtailment) to the repair voltage state required by the string to be repaired, and transmit it to the string to be repaired for electrical injection repair, so as to realize the mutual electrical injection repair function between multiple photovoltaic strings.

[0062] Therefore, this application can directly utilize the photovoltaic curtailment generated by the photovoltaic power station under restricted power generation conditions to achieve mutual power injection repair function between multiple photovoltaic strings by deploying photovoltaic string attenuation repair equipment 10 between multiple photovoltaic strings and the power grid at the outdoor use site of the photovoltaic strings. This improves the repair efficiency of photovoltaic strings, reduces the cost of photovoltaic string repair, and avoids affecting the normal operation of the corresponding photovoltaic power station. It is convenient to quickly achieve large-scale photovoltaic module repair effect for large photovoltaic power stations.

[0063] Alternatively, please refer to Figure 2 , Figure 2 yes Figure 1 This is one of the schematic diagrams showing the composition of a photovoltaic string attenuation repair device 10. In this embodiment, the string mutual power injection unit 13 in the photovoltaic string attenuation repair device 10 may include multiple first switches 131 and a multi-directional DC converter 132; the multi-directional DC converter 132 includes multiple conversion connection terminals (i.e., Figure 2 The multi-directional DC converter 132 has the same number of conversion terminals as the string interconnection unit 13; the multiple first switches 131 are all normally open switches.

[0064] In this embodiment, the multi-directional DC converter 132 includes multiple conversion connection terminals, each of which is individually connected to one end of the first switch 131. The other end of each first switch 131 serves as a string connection terminal of the string mutual injection unit 13, so as to individually connect to a photovoltaic string of the photovoltaic power station via a maximum power point tracking circuit 12.

[0065] In this embodiment, when the main control unit 11 determines the string to be repaired and the power supply string to be repaired under the restricted power generation state of the photovoltaic power station, it can control the first switch 131 connected to the string to be repaired and the power supply string to be repaired respectively to be turned on, and control the multi-directional DC converter 132 to convert the DC voltage signal output by the power supply string to be repaired into a repair voltage state adapted to the string to be repaired and then inject it into the string to be repaired, so as to realize the electrical injection repair operation of the power supply string to the string to be repaired. For example, when it is determined that... Figure 2 When photovoltaic string A is designated as the repair power supply string, and photovoltaic string C is identified as the string to be repaired, it can be controlled... Figure 2 The first switch 131, which is indirectly connected to photovoltaic strings A and C respectively, is turned on, and the multi-directional DC converter 132 is controlled to convert the DC voltage signal provided by photovoltaic string A into a repair voltage state adapted to photovoltaic string C, and transmit the converted DC voltage signal to photovoltaic string C for electrical injection repair; and when it is determined that Figure 2 When photovoltaic string C is designated as the repair power supply string, and photovoltaic string A is identified as the string to be repaired, it can be controlled... Figure 2 The first switch 131, which is indirectly connected to photovoltaic string A and photovoltaic string C respectively, is turned on, and the multi-directional DC converter 132 is controlled to convert the DC voltage signal provided by photovoltaic string C into a repair voltage state adapted to photovoltaic string A, and the converted DC voltage signal is transmitted to photovoltaic string A for electrical injection repair.

[0066] Alternatively, please refer to Figure 3 , Figure 3 yes Figure 1 The second schematic diagram shows the composition of the photovoltaic string attenuation repair device 10. In this embodiment, the string mutual power injection unit 13 in the photovoltaic string attenuation repair device 10 may include multiple second switches 133 and at least one bidirectional DC-DC converter 134; any one of the bidirectional DC-DC converters 134 includes two conversion connection terminals (i.e., Figure 3 The two conversion connection terminals (CC terminal) can realize the DC voltage conversion effect between the two conversion connection terminals (for example, stepping up and down the actual input DC voltage value of one conversion connection terminal of the corresponding bidirectional DC converter 134 to the desired output DC voltage value of the other conversion connection terminal of the bidirectional DC converter 134); the number of bidirectional DC converters in the same photovoltaic string attenuation repair device 10 can be calculated by “n! / (2*(n-2)!)”, where “n” is used to represent the number of string connection terminals of the string mutual injection unit 13 in the corresponding photovoltaic string attenuation repair device 10; the multiple second switches 133 are all normally open switches.

[0067] In this embodiment, Figure 3The power output terminals of any two of the multiple maximum power point tracking circuits 12 are respectively connected to the two conversion connection terminals of the same bidirectional DC-DC converter 134 via a second switch 133, so that each string connection terminal of the string mutual injection unit 13 is simultaneously connected to one conversion connection terminal of each of n-1 bidirectional DC-DC converters 134 inside the string mutual injection unit 13.

[0068] In this embodiment, when the main control unit 11 determines the string to be repaired and the power supply string to be repaired under the limited power generation state of the photovoltaic power station, it can control the two second switches 133 directly connected to the two conversion connection terminals of the bidirectional DC-DC converter 134, which is simultaneously connected to the string to be repaired and the power supply string to be repaired via the maximum power point tracking circuit 12, to be turned on. Then, it controls the bidirectional DC-DC converter 134 to convert the DC voltage signal output by the power supply string to be repaired into a repair voltage state adapted to the string to be repaired and inject it into the string to be repaired, so as to realize the electrical injection repair operation of the power supply string to the string to be repaired. For example, when it is determined that... Figure 3 When photovoltaic string A is designated as the repair power supply string, and photovoltaic string C is designated as the string to be repaired, Figure 3 The bidirectional DC-DC converter 134 at the top is the one that connects both photovoltaic string A and photovoltaic string C simultaneously via the maximum power point tracking circuit 12. At this time, it can be controlled... Figure 3 The two second switches 133, directly connected to the top bidirectional DC-DC converter 134, are turned on, controlling the top bidirectional DC-DC converter 134 to convert the DC voltage signal provided by photovoltaic string A into a repair voltage state adapted to photovoltaic string C, and then transmitting the converted DC voltage signal to photovoltaic string C for electrical injection repair; and when it is determined Figure 3 When photovoltaic string C is designated as the repair power supply string, and photovoltaic string A is identified as the string to be repaired, it can be controlled... Figure 3 The two second switches 133, which are directly connected to the top bidirectional DC-DC converter 134, are turned on, and the top bidirectional DC-DC converter 134 is controlled to convert the DC voltage signal provided by the photovoltaic string C into a repair voltage state that is compatible with the photovoltaic string A, and transmits the converted DC voltage signal to the photovoltaic string A for electrical injection repair.

[0069] Alternatively, please refer to Figure 4 , Figure 4 This is the second circuit schematic diagram of the photovoltaic string attenuation repair device 10 provided in this application embodiment. In this application embodiment, it is related to... Figure 1 Compared to the photovoltaic string attenuation repair device 10 shown, Figure 4The photovoltaic string attenuation repair device 10 shown may further include a battery repair control unit 15, wherein the battery connection terminal of the battery repair control unit 15 (i.e. Figure 4 The BC terminals of the battery repair control unit 15 are connected to the energy storage battery, and the multiple string connection terminals (i.e., ...) Figure 4 The multiple SC terminals of the battery repair control unit 15 are each individually connected to the power output terminal of the maximum power point tracking circuit 12, so that each string connection terminal of the battery repair control unit 15 can be individually connected to a photovoltaic string of the photovoltaic power station via a maximum power point tracking circuit 12. Furthermore, the cooperative power supply terminal of the battery repair control unit 15 (i.e., Figure 4 The PS terminal of the inverter is connected to the input terminal of the photovoltaic inverter.

[0070] In this embodiment, the battery repair control unit 15 can be used to monitor the operating status of the energy storage battery, prevent the energy storage battery from being overcharged or over-discharged, and output a matching DC voltage and DC current to the outside through any one of the multiple string connection terminals and the collaborative power supply terminal according to specific needs. The multiple photovoltaic strings of the photovoltaic power station can charge the energy storage battery through the multiple string connection terminals or the collaborative power supply terminal.

[0071] In this embodiment, the main control unit 11 is also communicatively connected to the battery repair control unit 15. When the inverter monitoring circuit 14 detects that the photovoltaic power station is not in a restricted power generation state, it determines the photovoltaic string to be repaired from among the multiple photovoltaic strings indirectly connected to the battery repair control unit 15 based on the real-time performance degradation values ​​of each string. In this case, the photovoltaic string whose corresponding real-time performance degradation value exceeds a preset degradation threshold is preferentially selected as the repair string. Then, the main control unit 11 controls the battery repair control unit 15 to convert the stored energy of the energy storage battery to the repair voltage state required by the repair string and transmits it to the repair string for electrical injection repair, thereby realizing the electrical injection repair function of the energy storage battery for multiple photovoltaic strings in the photovoltaic power station.

[0072] Therefore, this application can be passed Figure 4 The battery repair control unit 15, in conjunction with the energy storage battery, can directly utilize the energy storage battery at the outdoor application site of the photovoltaic string when the photovoltaic power station is not in a restricted power generation state, thereby improving the repair efficiency of the photovoltaic string and avoiding affecting the normal operation of the corresponding photovoltaic power station. This facilitates the rapid achievement of large-scale photovoltaic module repair effects for large photovoltaic power stations.

[0073] In this embodiment, Figure 4The inverter monitoring circuit 14 can also detect whether the photovoltaic power station is in a low-irradiance power generation state by monitoring the operating status of the photovoltaic inverter in real time. Specifically, if the actual output power of the photovoltaic inverter is greater than or equal to the output power threshold matching the limited power generation state, the inverter monitoring circuit 14 can determine whether the photovoltaic power station is in a low-irradiance power generation state by monitoring whether the actual input power at the input terminal of the photovoltaic inverter is greater than or equal to the input power threshold matching the low-irradiance power generation state. When the actual input power of the photovoltaic inverter is greater than or equal to the input power threshold matching the low-irradiance power generation state, it indicates that the photovoltaic inverter is continuously supplying power to the grid, and the current power generation environment of the photovoltaic power station is not a weak light generation environment; in this case, the photovoltaic power station is not in a low-irradiance power generation state. Conversely, when the actual input power of the photovoltaic inverter is less than the input power threshold matching the low-irradiance power generation state, it indicates that the photovoltaic inverter is continuously supplying power to the grid, but the current power generation environment of the photovoltaic power station is a weak light generation environment; in this case, the photovoltaic power station is in a low-irradiance power generation state.

[0074] In this embodiment, when the inverter monitoring circuit 14 detects that the photovoltaic power station is in a low-irradiance power generation state, the main control unit 11 can control the battery repair control unit 15 to transmit the stored energy of the energy storage battery to the grid for power supply. This enables the energy storage battery to cooperate with multiple photovoltaic strings of the photovoltaic power station to supply power to the grid in a coordinated manner, thereby compensating for the weak light power generation of the photovoltaic power station and improving the power supply stability of the photovoltaic power station at the grid.

[0075] Furthermore, it can be understood that when the inverter monitoring circuit 14 detects that the photovoltaic power station is in a restricted power generation state, the main control unit 11 can control the battery repair control unit 15 to transmit the electrical energy (i.e., photovoltaic curtailment) generated by multiple photovoltaic strings in the restricted power generation state of the photovoltaic power station to the energy storage battery for storage via the cooperative power supply terminal or multiple string connection terminal, so as to reduce the waste of photovoltaic power generation and improve the utilization rate of photovoltaic curtailment (for example, the photovoltaic curtailment can be stored for photovoltaic string repair).

[0076] Alternatively, please refer to Figure 5 , Figure 5 yes Figure 4 The diagram shows the composition of the photovoltaic string attenuation repair device 10. In this embodiment, the battery repair control unit 15 in the photovoltaic string attenuation repair device 10 may include a battery output control circuit 151, multiple third switches 152, and a grid power supply switch 153. The battery input terminal of the battery output control circuit 151 (i.e.,...) Figure 5The BI terminal in the battery repair control unit 15 serves as the battery connection terminal and is electrically connected to the energy storage battery; the plurality of third switches 152 and the grid power supply switch 153 are all normally open switches.

[0077] In this embodiment, one end of each third switch 152 serves as a string connection terminal of the battery repair control unit 15, one end of the mains power supply switch 153 serves as a co-power supply terminal of the battery repair control unit 15, and the other end of each third switch 152 is connected to the voltage output terminal of the battery output control circuit 151 (i.e., Figure 5 The other end of the mains power supply switch 153 is connected to the voltage output terminal of the battery output control circuit 151.

[0078] In this embodiment, when the main control unit 11 determines at least one string to be repaired when the photovoltaic power station is not under a restricted power generation state, it can control the third switch 152 connected to each string to be repaired to be turned on, and control the battery output control circuit 151 to convert the DC voltage signal output by the energy storage battery into a repair voltage state adapted to the string to be repaired and inject it into the string to be repaired, so as to realize the electrical injection repair operation of the energy storage battery on the string to be repaired. For example, when it is determined that... Figure 5 When photovoltaic string B is the string to be repaired, it can be controlled... Figure 5 The third switch 152, which is indirectly connected to the photovoltaic string B, is turned on, and the battery output control circuit 151 is controlled to convert the DC voltage signal provided by the energy storage battery into a repair voltage state that is compatible with the photovoltaic string B, and transmits the converted DC voltage signal to the photovoltaic string B for electrical injection repair.

[0079] In this embodiment, when the photovoltaic power station is in a restricted power generation state, the main control unit 11 can control the grid power supply switch 153 or all third switches 152 to conduct, so that the electrical energy generated by the multiple photovoltaic strings of the photovoltaic power station in the restricted power generation state (i.e., photovoltaic curtailment) can be transmitted to the energy storage battery for storage until the energy storage battery reaches a full charge. When the energy storage battery reaches a full charge, the main control unit 11 can control the grid power supply switch 153 or all third switches 152 to disconnect, thereby preventing battery overcharging.

[0080] In this embodiment, when the photovoltaic power station is in a low-irradiance power generation state, the main control unit 11 can control the grid power supply switch 153 to be turned on, so that the energy storage battery supplies power to the grid through the battery output control circuit 151, thereby compensating for the weak light power generation of the photovoltaic power station and improving the power supply stability of the photovoltaic power station at the grid. When the remaining charge of the energy storage battery reaches a preset charge level, the main control unit 11 can control the grid power supply switch 153 to be turned off to prevent over-discharge of the battery.

[0081] In this application, to ensure that any of the above-mentioned photovoltaic string attenuation repair devices 10 can directly perform electrical injection repair on photovoltaic strings at outdoor application sites, thereby improving the repair efficiency of photovoltaic strings, avoiding impact on the normal operation of the corresponding photovoltaic power station, and facilitating large-scale photovoltaic module repair, this application provides a photovoltaic string attenuation repair control method applied to the photovoltaic string attenuation repair device 10 to achieve the aforementioned objective. The photovoltaic string attenuation repair control method provided in this application will be described in detail below.

[0082] Please refer to Figure 6 , Figure 6 This is one of the flowcharts illustrating the photovoltaic string attenuation repair control method provided in this application embodiment. In this application embodiment, the photovoltaic string attenuation repair control method may include steps S210 to S230, so that at the outdoor application site of the photovoltaic string, the photovoltaic curtailment generated by the photovoltaic power station under restricted power generation conditions can be directly utilized to achieve mutual electrical injection repair function between multiple photovoltaic strings, thereby improving the photovoltaic string repair efficiency, reducing photovoltaic string repair cost losses, and avoiding impact on the normal operation of the corresponding photovoltaic power station. This facilitates the rapid achievement of large-scale photovoltaic module repair effects for large photovoltaic power stations.

[0083] Step S210: Detect whether the photovoltaic power station is in a restricted power generation state, and obtain the real-time maximum power generation of each of the multiple photovoltaic strings in the photovoltaic power station during the photovoltaic power generation process to perform string performance degradation analysis, and obtain the real-time performance degradation value of each of the multiple photovoltaic strings during the photovoltaic power generation process.

[0084] Step S220: When it is detected that the photovoltaic power station is in a restricted power generation state, based on the real-time performance degradation value of each of the multiple photovoltaic strings, the photovoltaic string with the largest corresponding real-time performance degradation value is selected as the string to be repaired, and the photovoltaic string with the smallest corresponding real-time performance degradation value is selected as the repair power supply string.

[0085] In step S230, the control string mutual power injection unit transmits the electrical energy generated by the repair power supply string to the string to be repaired for electrical injection repair.

[0086] Therefore, by executing the above steps S210 to S230, this application can directly utilize the photovoltaic curtailment generated by the photovoltaic power station under restricted power generation conditions at the outdoor application site of the photovoltaic string to realize the mutual electric injection repair function between multiple photovoltaic strings, thereby improving the repair efficiency of the photovoltaic string, reducing the repair cost of the photovoltaic string, and avoiding affecting the normal operation of the corresponding photovoltaic power station. This facilitates the rapid achievement of large-scale photovoltaic module repair effects for large photovoltaic power stations.

[0087] Alternatively, please refer to Figure 7 , Figure 7 This is the second schematic flowchart of the photovoltaic string attenuation repair control method provided in this application embodiment. In this application embodiment, when the photovoltaic string attenuation repair device 10 includes a battery repair control unit 15, Figure 7 The photovoltaic string attenuation repair control method shown is relative to Figure 6 The photovoltaic string attenuation repair control method shown may further include steps S240 to S260, so that when the photovoltaic power station is not in a restricted power generation state, the energy storage battery can be used directly to realize the photovoltaic string repair function at the outdoor use site of the photovoltaic string, thereby improving the photovoltaic string repair efficiency and avoiding affecting the normal operation of the corresponding photovoltaic power station, which is convenient for quickly achieving large-scale photovoltaic module repair effect for large photovoltaic power stations.

[0088] Step S240: If the photovoltaic power station is not in a restricted power generation state, detect whether the real-time performance degradation value of each of the multiple photovoltaic strings exceeds the preset degradation threshold.

[0089] Step S250: Select photovoltaic strings whose real-time performance degradation value exceeds the preset degradation threshold as strings to be repaired, and determine the expected repair order of all strings to be repaired.

[0090] In this embodiment, when multiple photovoltaic strings in the photovoltaic power station are identified as having real-time performance degradation values ​​exceeding a preset degradation threshold, these strings can be sorted in descending order of priority according to their pre-configured string priorities at the photovoltaic power station to obtain the desired repair order. In this case, the string with the highest priority in the desired repair order has a higher priority. Alternatively, the strings can be sorted in descending order of degradation based on their real-time performance degradation values ​​to obtain the desired repair order. In this case, the string with the highest priority in the desired repair order has a higher real-time performance degradation value. This application does not limit the specific arrangement method of the desired repair order; it can be adaptively configured by photovoltaic power generation managers according to string repair needs.

[0091] Step S260: Arrange the results according to the desired repair order, and control the battery repair control unit to sequentially transfer the stored electrical energy of the energy storage battery to each string to be repaired for electrical injection repair.

[0092] Therefore, by executing the above steps S210 and S240 to S260, this application can directly utilize energy storage batteries to achieve photovoltaic string repair function at the outdoor use site of photovoltaic strings when the photovoltaic power station is not in a restricted power generation state. This improves the photovoltaic string repair efficiency and avoids affecting the normal operation of the corresponding photovoltaic power station, making it convenient to quickly achieve large-scale photovoltaic module repair effect for large photovoltaic power stations.

[0093] Alternatively, please refer to Figure 8 , Figure 8 This is the third schematic flowchart of the photovoltaic string attenuation repair control method provided in this application embodiment. In this application embodiment, when the photovoltaic string attenuation repair device 10 includes a battery repair control unit 15, Figure 8 The photovoltaic string attenuation repair control method shown is relative to Figure 6 or Figure 7 The photovoltaic string attenuation repair and control method shown may further include steps S310 to S320, so that when the photovoltaic power station is in a low-irradiance power generation state, the energy storage battery can be used at the outdoor use site of the photovoltaic string to realize the weak light power generation compensation function of the photovoltaic power station, thereby improving the power supply stability of the photovoltaic power station at the grid.

[0094] Step S310: If the photovoltaic power station is not in a restricted power generation state, then detect whether the photovoltaic power station is in a low irradiance power generation state.

[0095] Step S320: When the photovoltaic power station is detected to be in a low-irradiance power generation state, the battery repair control unit controls the energy storage battery to transmit the stored energy to the grid for power supply.

[0096] Therefore, by executing the above steps S210 and S310 to S320, this application can utilize energy storage batteries in the outdoor use site of the photovoltaic string to achieve the function of compensating for weak light power generation of the photovoltaic power station when the photovoltaic power station is in a low-irradiance power generation state, thereby improving the power supply stability of the photovoltaic power station at the grid.

[0097] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of the apparatus, methods, and computer program products according to embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0098] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part. If the various functions provided in this application are implemented in the form of software functional modules and sold or used as independent products, they can be stored in a storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause any of the above-mentioned photovoltaic string attenuation repair devices 10 to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned readable storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0099] The above descriptions are merely various embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A photovoltaic string attenuation repair device, characterized in that, The repair equipment includes a main control unit, an inverter monitoring circuit, a string mutual injection unit, and multiple maximum power point tracking circuits. The power input terminals of each of the multiple maximum power point tracking circuits are individually connected to a photovoltaic string in the photovoltaic power station. The power output terminals of each of the multiple maximum power point tracking circuits are interconnected and connected to the power grid via the photovoltaic inverter. Each string connection terminal of the string mutual injection unit is individually connected to the power output terminal of one of the maximum power point tracking circuits. The inverter monitoring circuit is used to monitor the operating status of the photovoltaic inverter in real time to detect whether the photovoltaic power station is in a state of restricted power generation. The main control unit is communicatively connected to multiple maximum power point tracking circuits, and is used to obtain the real-time maximum power generation of the photovoltaic strings connected to each of the multiple maximum power point tracking circuits during the photovoltaic power generation process, perform string performance degradation analysis, and obtain the real-time performance degradation value of the corresponding photovoltaic string during the photovoltaic power generation process. The main control unit is also communicatively connected to the string mutual injection unit and the inverter monitoring circuit, respectively. When the photovoltaic power station is in a restricted power generation state, it determines the string to be repaired and the power supply string to be repaired among the multiple photovoltaic strings according to the real-time performance degradation value of each of the multiple photovoltaic strings, and controls the string mutual injection unit to transmit the electrical energy generated by the power supply string to the string to be repaired for electrical injection repair.

2. The repair equipment according to claim 1, characterized in that, The string mutual power injection unit includes multiple first switches and a multi-directional DC-DC converter; The multi-directional DC converter includes multiple conversion connection terminals, each of which is individually connected to one end of the first switch, and the other end of each first switch serves as a string connection terminal of the string mutual injection unit. The main control unit controls the first switch connected to the string to be repaired and the repair power supply string to be turned on, and controls the multi-directional DC converter to convert the DC voltage signal output by the repair power supply string into a repair voltage state adapted to the string to be repaired and then inject it into the string to be repaired, so as to realize the electro-injection repair operation of the repair power supply string on the string to be repaired.

3. The repair equipment according to claim 1, characterized in that, The string mutual power injection unit includes multiple second switches and at least one bidirectional DC-DC converter, wherein the power output terminals of any two maximum power point tracking circuits in the multiple maximum power point tracking circuits are respectively connected to the two conversion connection terminals of the same bidirectional DC-DC converter via a second switch. Specifically, for the bidirectional DC-DC converter that is simultaneously connected to the string to be repaired and the repair power supply string via a maximum power point tracking circuit, the main control unit controls the two second switches directly connected to the bidirectional DC-DC converter to be turned on, and controls the bidirectional DC-DC converter to convert the DC voltage signal output by the repair power supply string into a repair voltage state adapted to the string to be repaired and then inject it into the string to be repaired, so as to realize the electro-injection repair operation of the repair power supply string on the string to be repaired.

4. The repair equipment according to any one of claims 1-3, characterized in that, The repair device also includes a battery repair control unit, the battery connection terminal of which is connected to an energy storage battery, and the multiple string connection terminals of the battery repair control unit are each individually connected to the power output terminal of the maximum power point tracking circuit. The main control unit is also communicatively connected to the battery repair control unit, and is used to determine the string to be repaired among the multiple photovoltaic strings according to the real-time performance degradation value of each of the multiple photovoltaic strings when the photovoltaic power station is not in a restricted power generation state, and control the battery repair control unit to transfer the stored electrical energy of the energy storage battery to the string to be repaired for electrical injection repair.

5. The repair equipment according to claim 4, characterized in that, The inverter monitoring circuit is also used to detect whether the photovoltaic power station is in a low-irradiance power generation state. The power supply terminal of the battery repair control unit is connected to the input terminal of the photovoltaic inverter; wherein, when the photovoltaic power station is in a low-irradiance power generation state, the main control unit controls the battery repair control unit to transmit the stored electrical energy of the energy storage battery to the grid for power supply.

6. The repair equipment according to claim 5, characterized in that, The battery repair control unit includes a battery output control circuit, multiple third switches, and a mains power supply switch; The battery input terminal of the battery output control circuit serves as the battery connection terminal of the battery repair control unit. One end of each of the third switches serves as a string connection terminal of the battery repair control unit, and one end of the mains power supply switch serves as a cooperative power supply terminal of the battery repair control unit; The other end of each of the third switches is connected to the voltage output terminal of the battery output control circuit, and the other end of the mains power supply switch is connected to the voltage output terminal of the battery output control circuit. The main control unit controls the third switch connected to the string to be repaired to turn on, and controls the battery output control circuit to convert the DC voltage signal output by the energy storage battery into a repair voltage state adapted to the string to be repaired and inject it into the string to be repaired, so as to realize the electrical injection repair operation of the energy storage battery on the string to be repaired; the main control unit controls the grid power supply switch to turn on, so that the energy storage battery supplies power to the grid through the battery output control circuit.

7. A method for controlling and repairing the attenuation of a photovoltaic string, characterized in that, The control method, applied to the photovoltaic string attenuation repair equipment according to any one of claims 1-6, comprises: The system detects whether the photovoltaic power station is in a restricted power generation state, and obtains the real-time maximum power generation of each of the multiple photovoltaic strings in the photovoltaic power station during the photovoltaic power generation process to perform string performance degradation analysis, thereby obtaining the real-time performance degradation value of each of the multiple photovoltaic strings during the photovoltaic power generation process. When the photovoltaic power station is detected to be in a restricted power generation state, the photovoltaic string with the largest real-time performance degradation value is selected as the string to be repaired, and the photovoltaic string with the smallest real-time performance degradation value is selected as the power supply string to be repaired, based on the real-time performance degradation value of each of the multiple photovoltaic strings. The control string mutual power injection unit transmits the electrical energy generated by the repair power supply string to the string to be repaired for electrical injection repair.

8. The control method according to claim 7, characterized in that, When the photovoltaic string attenuation repair equipment includes a battery repair control unit, the control method further includes: If the photovoltaic power station is not in a restricted power generation state, it is detected whether the real-time performance degradation value of each of the multiple photovoltaic strings exceeds the preset degradation amplitude threshold. Photovoltaic strings whose real-time performance degradation value exceeds the preset degradation magnitude threshold are identified as strings to be repaired, and the expected repair order of all strings to be repaired is determined. According to the desired repair order, the battery repair control unit controls the battery to sequentially transfer the stored electrical energy of the energy storage battery to each string to be repaired for electrical injection repair.

9. The control method according to claim 8, characterized in that, The control method further includes: If the photovoltaic power station is not in a restricted power generation state, then the system will detect whether the photovoltaic power station is in a low-irradiance power generation state. When the photovoltaic power station is detected to be in a low-irradiance power generation state, the battery repair control unit controls the energy storage battery to transmit the stored energy to the power grid for power supply.

10. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the photovoltaic string attenuation repair device according to any one of claims 1-6, it implements the photovoltaic string attenuation repair control method according to any one of claims 7-9.

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