Energy-saving device for photovoltaic power station

Abstract

This application provides an energy-saving device for a photovoltaic power station. The device includes a controller and a high-voltage switch; the controller is connected to the high-voltage switch; the high-voltage switch is installed on the collector line corresponding to the photovoltaic power station, with one end of the high-voltage switch located on the side of the collector line adjacent to a first box-type transformer, which represents the box-type transformer closest to the photovoltaic power station along the collector line; the high-voltage switch is also connected to the high-voltage side of the first box-type transformer, and the low-voltage side of the first box-type transformer is connected to the corresponding low-voltage load. The high-voltage switch is used to control the disconnection and connection of high-voltage loads on the collector line whose distance to the photovoltaic power station is greater than that of the first box-type transformer. This method addresses the problem of insufficient actual energy-saving effect of the corresponding equipment and lines of box-type transformers in related technologies.

Description

Technical Field

[0001] This application relates to the field of power grid technology, and in particular to an energy-saving device for photovoltaic power plants. Background Technology

[0002] In a photovoltaic power generation system, the collector line collects the electrical energy output from each photovoltaic module string through the combiner box to the inverter, and then collects it through the inverter output terminal to the DC and AC transmission lines of the power generation bus. The box-type substation is an important part of the collector line and is also the largest electrical load when the photovoltaic circuit is not generating electricity at night.

[0003] In related technologies, in order to reduce the nighttime power load of the transformer substation, a dedicated low-voltage power supply line and step-down transformer are configured for the transformer substation to supply power to the transformer substation at night through the low-voltage power supply line. However, this will also increase the hardware cost and lead to insufficient actual energy saving effect. Utility Model Content

[0004] This application provides an energy-saving device for photovoltaic power plants to address the problem of insufficient actual energy-saving effect of corresponding equipment and lines in related technologies.

[0005] In a first aspect, embodiments of this application provide a photovoltaic power plant energy-saving device, comprising:

[0006] Controllers and high-voltage switches;

[0007] The controller is connected to the high-voltage switch;

[0008] The high-voltage switch is installed on the collector line corresponding to the photovoltaic power station. One end of the high-voltage switch is installed on the side of the collector line adjacent to the first box-type transformer. The first box-type transformer is used to indicate the box-type transformer that is closest to the photovoltaic power station along the collector line.

[0009] The high-voltage switch is also connected to the high-voltage side of the first box-type transformer, and the low-voltage side of the first box-type transformer is connected to the corresponding low-voltage load. The high-voltage switch is used to control the disconnection and connection of the high-voltage load on the collector line that is farther from the photovoltaic power station than the high-voltage load of the first box-type transformer.

[0010] In one possible implementation, the high-voltage load also includes a second box-type transformer and a box-type transformer along the line. The second box-type transformer is used to refer to the box-type transformer that is closest to the first box-type transformer along the collector line, and the box-type transformer along the line is used to refer to the box-type transformer that is located along the collector line from the first box-type transformer to the second box-type transformer and is located at a distance greater than the second box-type transformer from the photovoltaic power station.

[0011] In one possible implementation, the end of the high-voltage switch that is off-center from the high-voltage side of the first box-type transformer is connected to the high-voltage side of the second box-type transformer. The high-voltage switch is used to control the disconnection and connection of the second box-type transformer with the box-type transformers along the line.

[0012] In one possible implementation, the photovoltaic power station energy-saving device further includes a drive module, a controller connected to the drive module, an input terminal of the drive module connected to the low-voltage side of the first box-type transformer, and an output terminal of the drive module connected to the low-voltage side of the second box-type transformer. The drive module is used to adjust the voltage on the low-voltage side of the first box-type transformer and the voltage on the low-voltage side of the second box-type transformer to a mutually matched state.

[0013] In one possible implementation, the controller includes a voltage acquisition module, the receiving end of which is connected to the input and output ends of the drive module, respectively, and the voltage acquisition module is used to acquire the voltage at the input and output ends of the drive module.

[0014] In one possible implementation, the low-voltage load is a photovoltaic power generation unit connected to the low-voltage side of the first box-type transformer.

[0015] In one possible implementation, the photovoltaic power station energy-saving device also includes a low-voltage switch. The controller is connected to the low-voltage switch, one end of which is connected to the low-voltage side of the first box-type transformer, and the other end of which is connected to the photovoltaic power generation unit. The low-voltage switch is used to control the switching off and on of the photovoltaic power generation unit.

[0016] In one possible implementation, the controller is communicatively connected to the photovoltaic power plant.

[0017] In one possible implementation, the collector line is a 35kV high-voltage distribution line.

[0018] In one possible implementation, the photovoltaic power station energy-saving device is located at the location of the first box-type transformer, or the photovoltaic power station energy-saving device is located inside the casing of the first box-type transformer.

[0019] The photovoltaic power station energy-saving device provided in this application embodiment achieves intelligent switching and connection control of high-voltage loads by installing a high-voltage switch on the collector line and connecting it to the high-voltage side of the first box-type transformer closest to the photovoltaic power station. Through the controller's operation of the high-voltage switch, unnecessary high-voltage loads can be effectively cut off at night or during other non-power generation periods, thereby reducing the nighttime power load on the box-type transformer. This method not only avoids the hardware costs of additional low-voltage power supply lines and step-down transformers but also significantly improves the overall system's energy-saving effect and optimizes the energy management of the photovoltaic power station. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] Figure 1 A schematic diagram of a photovoltaic power plant energy-saving device in the prior art provided in this disclosure embodiment;

[0022] Figure 2 This is a schematic diagram of the structure of a photovoltaic power station energy-saving device provided in one embodiment of the present disclosure.

[0023] in,

[0024] 200. Energy-saving devices;

[0025] 210. Controller; 211. Voltage acquisition module; 220. High voltage switch; 230. Drive module; 240. Low voltage switch;

[0026] 300. Photovoltaic power station; 310. Collection line; 320. First box-type transformer; 330. Low-voltage load; 331. Photovoltaic power generation unit; 340. High-voltage load; 341. Second box-type transformer; 342. Box-type transformer along the line.

[0027] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0029] In photovoltaic (PV) power generation systems, prefabricated substations (PGS) are a crucial component of the power collection lines, undertaking the critical task of gathering and transmitting the electrical energy output from each PV module to the power generation bus. However, in existing technologies, PGS still consume electrical energy at night or during other non-power generation periods, becoming one of the system's largest electrical loads. This not only increases the system's operating costs but also negatively impacts overall energy-saving performance. To address this issue, the traditional approach is to configure dedicated low-voltage power supply lines and step-down transformers for PGS, allowing power to be supplied to the substation at night. However, while this method reduces the nighttime electrical load of the PGS to some extent, it also increases hardware costs, resulting in less than satisfactory energy-saving performance.

[0030] Because photovoltaic (PV) power generation systems are designed to maximize the use of solar energy, their energy efficiency is often overlooked during non-power generation periods such as nighttime or cloudy days. However, with the widespread application of PV power generation systems and the increasing demands for renewable energy efficiency, optimizing energy consumption during non-power generation periods has become an urgent problem to be solved.

[0031] The challenge in solving this technical problem lies in achieving intelligent management of the transformer substation and its related equipment without significantly increasing system complexity and cost. While traditional low-voltage power supply lines and step-down transformers can alleviate nighttime electricity loads to some extent, the increased hardware costs and complexity offset some of the energy-saving benefits. Therefore, current technologies lack effective solutions for managing the high-voltage load of transformer substations without incurring additional costs.

[0032] The photovoltaic power station energy-saving device provided in this application achieves intelligent management of high-voltage loads by installing a high-voltage switch on the collector line of the photovoltaic power station and connecting it to the high-voltage side of the first box-type transformer closest to the photovoltaic power station. The controller operates the high-voltage switch to disconnect unnecessary high-voltage loads at night or during non-generation periods, thereby reducing the nighttime power load on the box-type transformer. This avoids additional hardware costs and improves the system's energy-saving effect and operational efficiency.

[0033] Figure 1 A schematic diagram of the structure of an energy-saving device in a photovoltaic power station in the prior art, such as... Figure 1As shown, in existing photovoltaic power generation schemes, the power station 100 is connected to each box-type transformer 110 via the main line 101, and each box-type transformer 110 is equipped with an energy-saving device 120 between the main line 101 and the energy-saving device 120. The energy-saving device 120 provides the box-type transformer 110 with the step-down function required when disconnecting from the main line 101 and the step-up function required when connecting to the main line 101. Therefore, the energy-saving device 120 needs to be equipped with corresponding step-down transformers and step-up transformers to disconnect the box-type transformer 110 at night to achieve energy-saving effect. (In this scheme, only one energy-saving device 120 needs to be added between the first and second box-type transformers, so that the energy-saving device 120 can provide the step-up function required for connecting to the main line 101 for all transformers 110 after the first box-type transformer.)

[0034] It should be noted that, Figure 1 The existing photovoltaic power plant energy-saving devices shown include a power station, main line, box-type transformer, and energy-saving device. Only one or a specific number of these are used as examples for illustration. However, in practice, this is not a limitation. That is to say, the number of power stations, main lines, box-type transformers, and energy-saving devices can be arbitrary (while in this scheme, only one energy-saving device is needed, and its capacity can be configured according to the number of box-type transformers).

[0035] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0036] Figure 2 This is a schematic diagram of the structure of the photovoltaic power station energy-saving device provided in this application, such as... Figure 2 As shown, the device includes:

[0037] The controller 210 and the high-voltage switch 220 are connected; the high-voltage switch 220 is installed on the collector line 310 corresponding to the photovoltaic power station 300, and one end of the high-voltage switch 220 is installed on the side of the collector line 310 adjacent to the first box-type transformer 320. The first box-type transformer 320 is used to indicate the box-type transformer that is closest to the photovoltaic power station 300 along the collector line 310.

[0038] The high-voltage switch 220 is also connected to the high-voltage side of the first box-type transformer 320. The low-voltage side of the first box-type transformer 320 is connected to the corresponding low-voltage load 330. The high-voltage switch 220 is used to control the switching out and connection of the high-voltage load 340 on the collector line 310 to the photovoltaic power station 300 when the distance is greater than that of the first box-type transformer 320.

[0039] Specifically, this embodiment is used to provide a general description of the main structure and core principles of the photovoltaic power station energy-saving device 200.

[0040] The controller 210 is the core component of the entire energy-saving device, responsible for monitoring and managing the operation of the high-voltage switch 220. In this embodiment, it can be a programmable logic controller (PLC) or other type of intelligent control device to control the state of the high-voltage switch 220 according to a preset program or real-time monitored data.

[0041] The high-voltage switch 220 is used to disconnect or connect the high-voltage load 340 on the collector line 310 according to the instructions of the controller 210. The selection of the high-voltage switch 220 can be adjusted according to the specific voltage level and load requirements to ensure that it can withstand the voltage and current of the system.

[0042] The first box-type transformer 320 is used to convert the electrical energy generated by the power generation equipment (such as photovoltaic solar panels) into high voltage and upload it to the collector line 310 during the day, and to receive the high voltage electrical energy output by the photovoltaic power station 300 at night, and then convert the high voltage electrical energy into low voltage electrical energy suitable for the low voltage load 330 to use at night.

[0043] In some embodiments, the high-voltage load 340 further includes a second box-type transformer 341 and a box-type transformer along the line 310. The second box-type transformer 341 is used to represent the box-type transformer that is closest to the first box-type transformer 320 along the collector line 310. The box-type transformer along the line 342 is used to represent the box-type transformer that is further from the first box-type transformer 320 to the second box-type transformer 341 along the collector line 310 and is farther from the photovoltaic power station 300 than the second box-type transformer 341.

[0044] Specifically, in practice, there are usually multiple box-type transformers connected to the collector line 310, including not only the first box-type transformer 320, but also the second box-type transformer 341 and the box-type transformers along the line 342. The second box-type transformer 341 refers to the box-type transformer closest to the first box-type transformer 320 along the collector line 310, while the box-type transformers along the line 342 refer to all box-type transformers extending from the first box-type transformer 320 towards the second box-type transformer 341 and farther away from the photovoltaic power station 300 (because these box-type transformers are not different in their connection relationship with the collector line 310 and the energy-saving device 200, they are described in general terms).

[0045] Each transformer box includes a corresponding high-voltage side and a low-voltage side (the function of the transformer box is to realize the voltage conversion between high voltage and low voltage). Therefore, one end of the high-voltage switch 220 is connected to the high-voltage side of the first transformer box 320, and the other end is connected to the high-voltage side of the second transformer box 341. The transformer box 342 along the line is not directly connected to the high-voltage switch 220, but is located on the path from the first transformer box 320 to the second transformer box 341.

[0046] This structure enables the energy-saving device 200 to manage the high-voltage loads 340 corresponding to multiple box-type transformers more flexibly, and allows the controller 210 to disconnect or connect the high-voltage side of these transformers as needed, so that the system can optimize energy consumption over a wider range, especially at night or during non-power generation periods, further reducing unnecessary power consumption and thus optimizing the energy consumption of the entire system.

[0047] In some embodiments, the end of the high-voltage switch 220 that is off-center from the high-voltage side of the first box-type transformer 320 is connected to the high-voltage side of the second box-type transformer 341. The high-voltage switch 220 is used to control the disconnection and connection of the second box-type transformer 341 and the box-type transformers 342 along the line.

[0048] Specifically, based on the aforementioned structure, by connecting the high-voltage switch 220 to the high-voltage side of the second box-type transformer 341, the high-voltage switch 220 is allowed to control the switching off and connecting of the second box-type transformer 341 and the box-type transformers 342 along the line, thereby further optimizing the management of the high-voltage load 340 of the system.

[0049] In some embodiments, the photovoltaic power station 300 energy-saving device further includes a drive module 230, a controller 210 connected to the drive module 230, an input terminal of the drive module 230 connected to the low-voltage side of the first box-type transformer 320, and an output terminal of the drive module 230 connected to the low-voltage side of the second box-type transformer 341. The drive module 230 is used to adjust the voltage on the low-voltage side of the first box-type transformer 320 and the voltage on the low-voltage side of the second box-type transformer 341 to a mutually matched state.

[0050] Specifically, the controller 210 is connected to the drive module 230, thereby adjusting the operation of the drive module 230. By setting the drive module 230, the voltage on the low-voltage side of the first box-type transformer 320 and the second box-type transformer 341 is adjusted to achieve a matching state, ensuring voltage matching between different transformers. The matching of the low-voltage side voltages of the two transformers ensures that the voltage at both ends of 220 is consistent, achieving shock-free closing without voltage difference when 220 is closed.

[0051] When switching back from nighttime energy-saving mode to daytime operation mode, the second box-type transformer 341 and subsequent box-type transformers 342 along the line need to be connected to the collector line 310. At this time, the controller 210 will control the drive module 230 to start running and establish the AC bus voltage until the output voltage of the drive module 230 is consistent with the input voltage. Since the low-voltage side voltage of the first box-type transformer 320 and the second box-type transformer 341 on the collector line 310 side is consistent at this time, the voltage on the high-voltage side will also become consistent. That is, the voltage at both ends of the high-voltage switch 220 is synchronized, and the high-voltage switch 220 can be closed without impact to ensure the normal operation of each high-voltage load 340.

[0052] In some embodiments, the controller 210 includes a voltage acquisition module 211, the receiving end of which is connected to the input and output ends of the drive module 230, respectively, and the voltage acquisition module 211 is used to acquire the voltage at the input and output ends of the drive module 230.

[0053] Specifically, the controller 210 collects voltage data from the input and output terminals of the drive module 230 through the voltage acquisition module 211 and transmits it to the controller 210 for analysis, so as to realize real-time monitoring and feedback of the voltage status of the drive module 230 and help the controller 210 make accurate voltage regulation decisions.

[0054] As needed, the voltage acquisition module 211 can also integrate more monitoring functions, such as current acquisition and power factor monitoring, to provide more comprehensive system status information. Through real-time voltage monitoring, it can determine whether the high-voltage switch 220 can be closed, ensuring the accuracy of voltage regulation and the stability of the system.

[0055] In some embodiments, the low-voltage load 330 includes a photovoltaic power generation unit 331 that is connected to the low-voltage side of the first box-type transformer 320.

[0056] Specifically, each box-type transformer is connected to the corresponding photovoltaic power generation unit 331 on the low-voltage side.

[0057] In some embodiments, the photovoltaic power station energy-saving device also includes a low-voltage switch 240, with the controller 210 connected to the low-voltage switch 240. One end of the low-voltage switch 240 is connected to the low-voltage side of the first box-type transformer 320, and the other end of the low-voltage switch 240 is connected to the photovoltaic power generation unit 331. The low-voltage switch 240 is used to control the switching off and connection of the photovoltaic power generation unit 331.

[0058] Specifically, based on the aforementioned structure, by setting a low-voltage switch 240, all photovoltaic power generation units 331 corresponding to the first box-type transformer 320 can be switched off when the photovoltaic power generation stops at night, thereby achieving the purpose of energy saving.

[0059] When switching from nighttime energy-saving mode back to daytime operation mode, the low-voltage switch 240 can be opened before the high-voltage switch 220 is opened, disconnecting the photovoltaic power generation unit 331 of the first box-type transformer 320, and then reconnected after the high-voltage switch 220 is closed, thereby preventing the high-voltage switch 220 from affecting the drive module 230 before it is powered on when switching back to daytime operation mode, thus ensuring the overall safety and service life of the energy-saving device 200.

[0060] In some embodiments, the controller 210 is communicatively connected to the photovoltaic power station 300.

[0061] Specifically, the controller 210 controls the working status of each module in the energy-saving device 200, which can be achieved according to the instructions sent in real time by the photovoltaic power station 300. At this time, the controller 210 exchanges data and transmits instructions with other devices in the photovoltaic power station 300 through the communication module, thereby completing the corresponding functions.

[0062] The specific communication connection method can be wired or wireless, such as Ethernet, Wi-Fi or Zigbee.

[0063] Through real-time communication, the controller 210 can dynamically adjust the system's operating status, improving energy efficiency and system responsiveness.

[0064] In some embodiments, the collector line 310 is a 35kV high-voltage distribution line.

[0065] Specifically, the high-voltage power distribution collection line 310 is connected to each transformer of the photovoltaic power station 300 to form a complete power transmission network, which can effectively transmit high-power electrical energy and is suitable for the power transmission needs of large-scale photovoltaic power stations 300.

[0066] In practice, the design of power distribution lines can be adjusted according to different voltage level requirements, such as 10kV or 110kV, so as to reduce line losses and equipment costs while ensuring transmission efficiency by selecting the appropriate voltage level.

[0067] In some embodiments, the photovoltaic power station energy-saving device 200 is located at the location of the first box-type transformer 320.

[0068] Specifically, since the energy-saving device 200 mainly controls the first box-type transformer 320 and its connection with the adjacent high-voltage load 340 and low-voltage load 330, the energy-saving device 200 can be combined with the first box-type transformer 320 in terms of layout, so as to achieve better direct control and management of the first box-type transformer 320, reduce wiring complexity, improve system integration and reliability, and reduce installation and maintenance costs.

[0069] The photovoltaic power plant energy-saving device provided in this application embodiment achieves more efficient energy consumption management by expanding and optimizing the structure and function of the photovoltaic power plant energy-saving device. By introducing a second box-type transformer and a box-type transformer along the line, the system can flexibly manage high-voltage loads over a wider range. The connection between the high-voltage switch and these transformers, combined with the voltage regulation function of the drive module, ensures the stability and voltage matching of the system. The voltage acquisition module provides real-time data support for the controller, optimizing voltage regulation decisions. The introduction of the low-voltage switch further enhances the management capability of the photovoltaic power generation unit. The communication connection between the controller and the photovoltaic power plant improves the system's responsiveness, while the 35kV high-voltage distribution line meets the needs of large-scale power transmission. By placing the energy-saving device near the first box-type transformer, the installation and maintenance of the system are simplified. These improvements collectively enhance the energy-saving effect and operational efficiency of the photovoltaic power plant.

[0070] In the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0071] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this utility model, in essence, or the part that contributes to the prior art, or a 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 a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0072] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0073] Finally, it should be noted that other embodiments of this utility model will readily conceive of by those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A photovoltaic power plant energy saving device, characterized in that, include: Controllers and high-voltage switches; The controller is connected to the high-voltage switch; The high-voltage switch is installed on the collector line corresponding to the photovoltaic power station. One end of the high-voltage switch is installed on the side of the collector line adjacent to the first box-type transformer. The first box-type transformer is used to indicate the box-type transformer that is closest to the photovoltaic power station along the collector line. The high-voltage switch is also connected to the high-voltage side of the first box-type transformer, and the low-voltage side of the first box-type transformer is connected to the corresponding low-voltage load. The high-voltage switch is used to control the disconnection and connection of the high-voltage load on the collector line that is farther from the photovoltaic power station than the high-voltage load of the first box-type transformer.

2. The apparatus of claim 1, wherein, The high-voltage load also includes a second box-type transformer and a box-type transformer along the line. The second box-type transformer is used to refer to the box-type transformer that is closest to the first box-type transformer along the collector line. The box-type transformer along the line is used to refer to the box-type transformer that is located along the collector line from the first box-type transformer to the second box-type transformer and is farther from the photovoltaic power station than the second box-type transformer.

3. The apparatus of claim 2, wherein, The high-voltage switch is connected to the high-voltage side of the second box-type transformer at one end that is offset from the high-voltage side of the first box-type transformer. The high-voltage switch is used to control the disconnection and connection of the second box-type transformer and the box-type transformer along the line.

4. The apparatus of claim 2, wherein, The energy-saving device for the photovoltaic power station also includes a drive module. The controller is connected to the drive module. The input terminal of the drive module is connected to the low-voltage side of the first box-type transformer, and the output terminal of the drive module is connected to the low-voltage side of the second box-type transformer. The drive module is used to adjust the voltage on the low-voltage side of the first box-type transformer and the voltage on the low-voltage side of the second box-type transformer to a mutually matched state.

5. The apparatus of claim 4, wherein, The controller includes a voltage acquisition module, the receiving end of which is connected to the input and output ends of the drive module, respectively, and the voltage acquisition module is used to acquire the voltage at the input and output ends of the drive module.

6. The apparatus of claim 2, wherein, The low-voltage load is a photovoltaic power generation unit connected to the low-voltage side of the first box-type transformer.

7. The apparatus of claim 6, wherein, The energy-saving device for the photovoltaic power station also includes a low-voltage switch. The controller is connected to the low-voltage switch. One end of the low-voltage switch is connected to the low-voltage side of the first box-type transformer, and the other end of the low-voltage switch is connected to the photovoltaic power generation unit. The low-voltage switch is used to control the switching off and connection of the photovoltaic power generation unit.

8. The apparatus of any one of claims 1 to 7, wherein, The controller is communicatively connected to the photovoltaic power station.

9. The apparatus of any one of claims 1 to 7, wherein, The collector line is a 35kV high-voltage distribution line.

10. The apparatus according to any one of claims 1 to 7, characterized in that, The photovoltaic power station energy-saving device is installed at the location of the first box-type transformer, or the photovoltaic power station energy-saving device is installed inside the outer casing of the first box-type transformer.

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