A snow removing system and method for a photovoltaic power station

Abstract

The application relates to a snow removing system and method for a photovoltaic power station. The snow removing system for the photovoltaic power station comprises a snow removing device, and the snow removing device comprises an induction device, a power generation device, an energy storage device and a snow removing mechanism. At least N photovoltaic panels of each photovoltaic panel string are respectively provided with the snow removing mechanism. The power generation device comprises a solar panel, the energy storage device is used for storing the electric energy transmitted by the solar panel, and the energy storage device and the power generation device are respectively connected with the induction device in signal connection. When the induction device monitors that the power generation power of the solar panel is less than or equal to a preset value, the energy storage device supplies power to the snow removing mechanism, the snow removing mechanism is used for removing the snow on the corresponding photovoltaic panel, N photovoltaic panels with the removed snow supply power to a single branch circuit, and then the snow on the remaining photovoltaic panels is heated and melted.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic technology, and in particular relates to a snow removal system and method for photovoltaic power plants. Background Technology

[0002] A photovoltaic (PV) power station connects multiple photovoltaic (PV) panels in series to form at least one PV string. The positive terminal of each PV string is connected to the positive terminal of a DC busbar of an inverter, and the negative terminal of each PV string is connected to the negative terminal of the corresponding DC busbar, forming a single circuit. When the PV panels generate electricity, each single circuit PV string produces DC power, which is then converted into AC power by the inverter bridge inside the inverter and fed into the power grid.

[0003] When the surface of photovoltaic panels is covered with snow, the power generation efficiency of photovoltaic power stations will be significantly reduced. In order to ensure the normal operation of photovoltaic power generation devices, snow removal devices will be used to remove snow.

[0004] Existing snow removal devices mostly use movable track snow scrapers. Correspondingly, multiple photovoltaic panel arrays are distributed to form a photovoltaic array. Tracks need to be installed on the photovoltaic array, and the track snow scrapers move along the tracks to sweep away the snow accumulated on each photovoltaic panel.

[0005] However, the snow removal device mentioned above is only suitable for photovoltaic power stations with regularly arranged photovoltaic panels, limiting its application scenarios. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a snow removal system and method for photovoltaic power plants, which is limited to photovoltaic power plants with regularly arranged photovoltaic panels and thus has limited application scenarios.

[0007] To address the aforementioned technical problems, this invention provides a snow removal system for photovoltaic power plants. The photovoltaic power plant includes at least one photovoltaic string, each photovoltaic string comprising M photovoltaic panels connected in series, and each photovoltaic string is connected in series with an inverter to form a single circuit. The snow removal system includes a snow sweeping device, which comprises a sensing device, a power generation device, an energy storage device, and a snow sweeping mechanism. At least N photovoltaic panels in each photovoltaic string are respectively equipped with the snow sweeping mechanism; wherein M > N, N ≥ 1. The power generation device includes a solar panel for generating electricity, and an energy storage device for storing the electrical energy transmitted by the solar panel. The energy storage device and the power generation device are respectively connected to the sensing device for signal transmission. When the sensing device detects that the power generation of the solar panel is less than or equal to a preset value, the energy storage device supplies power to the snow removal mechanism. The snow removal mechanism is used to remove the snow on the corresponding photovoltaic panel so that the N photovoltaic panels with the snow removed supply power to the single circuit, thereby heating and melting the snow on the remaining photovoltaic panels.

[0008] Optionally, the M photovoltaic panels of each photovoltaic string are arranged in an array along a first direction, and the photovoltaic panels located at the ends of the photovoltaic string along the first direction are provided with the snow sweeping mechanism, N=1.

[0009] Optionally, multiple photovoltaic strings are provided, and the photovoltaic panels of the multiple photovoltaic strings are arranged side by side along the second direction. Each photovoltaic string is connected in series with the inverter to form a single circuit. Each of the photovoltaic strings is provided with a snow sweeping device at one end along the first direction.

[0010] Optionally, the snow removal mechanism includes a snow removal motor, a transmission mechanism, and a snow removal brush. The snow removal motor drives the snow removal brush to oscillate back and forth along the surface of the photovoltaic panel through the transmission mechanism.

[0011] Optionally, the transmission mechanism includes a rotating shaft and a bearing assembly, the snow sweeping motor is located below the photovoltaic panel, and the extension direction of the rotating shaft is perpendicular to the surface of the photovoltaic panel; The bearing assembly includes an inner ring and an outer ring. The inner ring is located inside the outer ring and is coaxially arranged with the outer ring. One end of the rotating shaft is connected to the output end of the snow sweeping motor, and the other end of the rotating shaft extends upward from the photovoltaic panel and is inserted and fixed to the inner ring. One end of the snow sweeping brush is fixed to the outer ring. The snow sweeping motor is used to drive the rotating shaft to rotate, thereby causing the snow sweeping brush to swing back and forth along the surface of the photovoltaic panel.

[0012] Optionally, the photovoltaic panel is square, the photovoltaic panel is arranged at an angle along its long side, the photovoltaic panel has a low end side located on one side of its long side, the snow sweeping mechanism is disposed at the corner of the low end side of the photovoltaic panel, and the photovoltaic panel has a long side side and a short side side adjacent to its corner. The snow sweeping motor is used to drive the snow sweeping brush to swing back and forth between an initial position and a working position. In the initial position, the snow sweeping brush is located on the lower end side of the photovoltaic panel and close to the edge of the short side. In the working position, the snow sweeping brush swings to the long side side of the photovoltaic panel and close to the edge of the photovoltaic panel.

[0013] Optionally, the snow sweeping mechanism further includes a mounting base, which includes a base plate, a first limiting plate, and a second limiting plate. The base plate is fixed to the bottom surface of the photovoltaic panel, and the first and second limiting plates are fixed to the top surface of the base plate. The first limiting plate is attached to the side of the photovoltaic panel on its short side, and the second limiting plate is attached to the side of the photovoltaic panel on its long side. The housing of the snow sweeping motor is fixedly connected to the base plate.

[0014] Optionally, the base plate is provided with a buckle, and the bottom of the photovoltaic panel is provided with a groove with an opening facing the base plate, and the buckle is engaged in the groove.

[0015] On the other hand, the present invention provides a snow removal system for a photovoltaic power station, comprising: The sensing device monitors the power generation of the solar panel; When the sensing device detects that the power generation of the solar panel is less than or equal to a preset value, the energy storage device supplies power to the snow removal mechanism to activate the snow removal mechanism installed on at least N of the photovoltaic panels in each photovoltaic string. The snow removal mechanism removes the snow from the corresponding photovoltaic panel. The N photovoltaic panels with the snow removed supply power to the single circuit, while the snow on the remaining photovoltaic panels is heated and melted.

[0016] Optionally, the sensing device monitors the power generation of the solar panel, specifically including: The sensing device operates during a set time of day to monitor the power generation of the solar panel.

[0017] This invention discloses a snow removal system for a photovoltaic power station. Snow removal mechanisms are installed on at least N photovoltaic panels in each photovoltaic string. Each snow removal mechanism corresponds to a single photovoltaic panel. The snow removal device generates electricity for an energy storage device via a dedicated power generation device, which then powers the snow removal mechanism. The system first removes snow from the corresponding photovoltaic panel, and then uses the N snow-removed photovoltaic panels to power the entire single circuit. Unremoved photovoltaic panels generate heat when current passes through them, melting the accumulated snow and achieving self-heating snow melting. This snow removal system has no requirements on the arrangement of the multiple photovoltaic panels in the photovoltaic power station, is not limited by the usage scenario, and does not require personnel to be on-site for snow removal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the electrical connections of a snow removal system for a photovoltaic power station provided in an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of a photovoltaic panel equipped with a snow-sweeping mechanism.

[0019] The reference numerals in the accompanying drawings are as follows: 1. Photovoltaic string; 11. Photovoltaic panel; 111. Low-position side; 112. Long side; 113. Short side; 2. Inverter; 3. Single circuit; 4. Snow sweeper motor; 5. Snow sweeper brush; 6. Rotating shaft; 7. Bearing assembly; 71. Inner ring; 72. Outer ring; 8. Mounting base; 81. Base plate; 82. First limiting plate; 83. Second limiting plate. Detailed Implementation

[0020] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a snow removal system for a photovoltaic power station, which is used for snow removal in a photovoltaic power station. The photovoltaic power station includes at least one photovoltaic string 1, each photovoltaic string 1 includes M photovoltaic panels 11 connected in series, and each photovoltaic string 1 is connected in series with an inverter 2 to form a single branch circuit 3.

[0022] Specifically, the positive terminal of each photovoltaic string 1 is connected to the positive DC terminal of a DC bus of inverter 2 via a DC positive cable. ＋ The negative terminal of each photovoltaic string 1 is connected to the negative terminal of the corresponding DC return bus via a DC negative cable. - This forms a single-branch loop 3. When the photovoltaic panel 11 generates electricity, the photovoltaic string 1 of each single-branch loop 3 generates direct current, and the inverter bridge inside the inverter 2 inverts the direct current into alternating current and connects it to the power grid.

[0023] The snow removal system for a photovoltaic power station includes a snow removal device, which includes a sensing device, a power generation device, an energy storage device, and a snow removal mechanism. Each photovoltaic string 1 has at least N photovoltaic panels 11 equipped with a snow removal mechanism; where M > N and N ≥ 1.

[0024] The power generation device includes solar panels for generating electricity, and an energy storage device for storing the electrical energy transmitted by the solar panels. The energy storage device and the power generation device are respectively connected to the induction device for signal transmission. When the sensing device detects that the power generation of the solar panel is less than or equal to the preset value, the energy storage device supplies power to the snow removal mechanism. The snow removal mechanism is used to remove the snow on the corresponding photovoltaic panel 11 so that the N photovoltaic panels 11 with the snow removed supply power to a single circuit 3, and then the snow on the remaining photovoltaic panels 11 is heated and melted.

[0025] Specifically, the energy storage device is an energy storage battery. The sensing device usually measures the voltage, current and power of the power generation device through the power acquisition module. The controller compares the power generation of the solar panel with the set value. When the power generation is less than or equal to the set value, the energy storage device supplies power to the snow removal mechanism. When the power generation is greater than the set value, the energy storage device does not supply power.

[0026] It should be noted that the sensing device can only operate during a set time during the day, such as from 8:00 AM to 5:00 PM, to detect the power generation of the solar panels. At night, it can automatically enter a shutdown state or a low-power sleep state.

[0027] At least N photovoltaic panels 11 in each photovoltaic string 1 are equipped with snow removal mechanisms. When the photovoltaic power station is generating electricity normally, the snow removal mechanisms do not work. The solar panels of the power generation device receive sunlight, convert solar energy into electrical energy, and send it to the energy storage device for storage, which is then used to power the snow removal mechanisms.

[0028] When continuous snowfall causes the photovoltaic panels 11 of the photovoltaic power station and the solar panels of the power generation device to be covered by snow, and the sensing device detects that the power generation power of the power generation device is less than or equal to a preset value, both the solar panels and the photovoltaic power station can no longer generate electricity normally. At this time, the sensing device sends a signal to the energy storage device. After receiving the signal, the energy storage device supplies power to the snow removal mechanism. The snow removal mechanism on N photovoltaic panels 11 in each photovoltaic string 1 is activated to remove the snow on the corresponding photovoltaic panel 11. The photovoltaic panels 11 without snow removal mechanism are still covered by snow. The photovoltaic panels 11 with the snow removed receive sunlight and begin to generate electricity normally. The photovoltaic panels 11 with the snow removed act as the power source for the single circuit 3, causing the single circuit 3 to generate current. The photovoltaic panels 11 with the snow not removed act as the load of the single circuit 3. When the current passes through the photovoltaic panels 11 with the snow not removed, heat is generated, and the temperature rises, causing the adhesive layer of snow attached to the surface of the photovoltaic panel 11 to melt, so that the snow layer can slide off, realizing self-heating snow melting without the need for external energy supply.

[0029] Moreover, as some of the snow on the photovoltaic panel 11 slides off, the power generation of most of the photovoltaic panels 11 increases, the current in the single circuit 3 gradually increases, and the temperature of the photovoltaic panel 11 corresponding to the part where the snow has not slid off will rise to a higher temperature so that the snow melts completely and the entire photovoltaic power station operates normally. The snow removal mechanism stops snow removal when the energy storage device runs out of power, or when the sensing device detects that the solar panel has started generating electricity, it sends a signal to the energy storage device again, and the energy storage device stops supplying power to the snow removal mechanism.

[0030] In this snow removal system for a photovoltaic power station, the snow removal device generates electricity for an energy storage device via a dedicated power generation unit, which in turn powers the snow removal mechanism. The snow removal device operates independently of the photovoltaic power station, without interfering with it. This modular design facilitates installation in various photovoltaic power stations, offering good portability and scalability. Furthermore, the snow removal mechanism only needs to be installed on a portion of the photovoltaic panels 11 within the photovoltaic string 1. Each snow removal mechanism corresponds to a single photovoltaic panel 11. The snow removal mechanism first clears snow from the corresponding photovoltaic panel 11, and then the cleared panel 11 powers the entire single-branch circuit 3. Uncleared panels 11 generate heat when current flows through them, melting the snow and achieving self-heating snow removal. This snow removal system has no requirements regarding the arrangement of the multiple photovoltaic panels 11 within the photovoltaic power station, is not limited by the application scenario, requires no on-site personnel for snow removal, and requires no external energy supply.

[0031] Moreover, the snow removal system uses a snow removal mechanism to remove snow from a few photovoltaic panels 11. The photovoltaic panels 11 that have been cleared of snow generate electricity, which causes the remaining photovoltaic panels 11 on a single circuit 3 to heat up and melt the snow. This overturns the traditional method of using large-scale mobile snow removal equipment. The snow removal mechanism only needs to clear snow from a single photovoltaic panel 11. The snow removal area is small, the snow removal mechanism is small in size, the cost is low, and it is easy to promote.

[0032] In one embodiment, such as Figure 1 As shown, each photovoltaic string 1 has M photovoltaic panels 11 arranged in an array along the first direction. The photovoltaic panels 11 located at the ends of the photovoltaic string 1 along the first direction are equipped with a snow sweeping mechanism, and N=1.

[0033] Understandably, the large space around the photovoltaic panels 11 at the ends of the row of photovoltaic strings 1 provides ample working space for the mechanical structure of the snow sweeping mechanism, facilitating installation and subsequent maintenance.

[0034] Furthermore, the number of snow-sweeping mechanisms installed on each photovoltaic string 1 is relatively small, which reduces costs. Of course, considering snow melting efficiency and effect, the number of snow-sweeping mechanisms can be increased in actual deployment.

[0035] In one embodiment, multiple photovoltaic strings 1 are provided, and each photovoltaic string 1 is connected in series with an inverter 2 to form a single branch circuit 3; the photovoltaic panels 11 of the multiple photovoltaic strings 1 are arranged side by side along the second direction, and a snow sweeping device is provided at the end of each photovoltaic string 1 along the first direction.

[0036] It is understandable that the snow removal device on the photovoltaic panel 11 of each photovoltaic string 1 has a matching power generation device and energy storage device to generate and supply power to the snow removal mechanism. There is no need for multiple photovoltaic strings 1 to share a set of power generation and energy storage devices for snow removal mechanisms. The snow removal device is more modular, which is conducive to installation and replacement.

[0037] In one embodiment, such as Figure 2 As shown, the snow removal mechanism includes a snow removal motor 4, a transmission mechanism, and a snow removal brush 5. The snow removal motor 4 drives the snow removal brush 5 to swing back and forth along the surface of the photovoltaic panel 11 through the transmission mechanism.

[0038] Understandably, since the snow removal mechanism only needs to remove snow from a single photovoltaic panel 11 and the area to be removed is relatively small, the snow removal brush 5 can be used to remove the snow on the photovoltaic panel 11. The snow removal brush 5 does not need to move in a straight line along the photovoltaic panel 11, which simplifies the structure of the snow removal mechanism.

[0039] In one embodiment, such as Figure 2 As shown, the transmission mechanism includes a rotating shaft 6 and a bearing assembly 7. The snow sweeping motor 4 is located below the photovoltaic panel 11, and the extension direction of the rotating shaft 6 is perpendicular to the surface of the photovoltaic panel 11.

[0040] The bearing assembly 7 includes an inner ring 71 and an outer ring 72. The inner ring 71 is located inside the outer ring 72 and is arranged coaxially with the outer ring 72. One end of the rotating shaft 6 is connected to the output end of the snow sweeping motor 4, and the other end of the rotating shaft 6 extends upward out of the photovoltaic panel 11 and is inserted and fixed to the inner ring 71. One end of the snow sweeping brush 5 is fixed to the outer ring 72.

[0041] The snow sweeping motor 4 is used to drive the rotating shaft 6 to rotate. The inner ring 71 rotates with the rotating shaft 6, and the outer ring 72 rotates with the inner ring 71, so as to drive the snow sweeping brush 5 to swing back and forth along the surface of the photovoltaic panel 11.

[0042] It is understandable that by utilizing the space below the photovoltaic panel 11 to arrange the snow sweeping motor 4, the space occupied by the snow sweeping mechanism above the photovoltaic panel 11 can be reduced, thus avoiding the snow sweeping motor 4 from blocking the photovoltaic panel 11 and affecting the power generation efficiency.

[0043] The transmission mechanism transmits power only through the rotating shaft 6 and the bearing assembly 7. It has a simple structure, is easy to process and assemble, is easy to maintain and replace, and has low maintenance costs.

[0044] In one embodiment, such as Figure 2 As shown, the photovoltaic panel 11 is square and is arranged at an angle along its long side. The photovoltaic panel 11 has a low end side 111 located on one side along its long side. The snow sweeping mechanism is located at the corner of the low end side 111 of the photovoltaic panel 11. The photovoltaic panel 11 has a long side side 112 and a short side side 113 adjacent to its corner.

[0045] The snow sweeping motor 4 is used to drive the snow sweeping brush 5 to swing back and forth between the initial position and the working position. In the initial position, the snow sweeping brush 5 is located on the lower end side 111 of the photovoltaic panel 11 and close to the edge of the short side side 113. In the working position, the snow sweeping brush 5 swings to the long side side 112 of the photovoltaic panel 11 and close to the edge of the photovoltaic panel 11.

[0046] Understandably, the snow sweeping motor 4 drives the snow sweeping brush 5 to swing 90°, causing the snow sweeping brush 5 to repeatedly swing between the initial position and the working position, thereby sweeping away the snow accumulated on the photovoltaic panel 11. Moreover, when the energy storage device loses power, due to the tilted arrangement of the photovoltaic panel 11 and the snow sweeping mechanism being located on the lower end side 111 of the photovoltaic panel 11, the snow sweeping brush 5 can return to its initial position by gravity. The snow sweeping brush 5 in the initial position is located on the lower end side 111 of the photovoltaic panel 11, avoiding the snow sweeping brush 5 from blocking the light-receiving surface of the photovoltaic panel 11 and ensuring power generation efficiency.

[0047] In one embodiment, such as Figure 2 As shown, the snow sweeping mechanism also includes a mounting base 8, which includes a base plate 81, a first limiting plate 82, and a second limiting plate 83. The base plate 81 is fixed to the bottom surface of the corner of the low end side 111 of the photovoltaic panel 11. The first limiting plate 82 and the second limiting plate 83 are fixed to the top surface of the base plate 81. The first limiting plate 82 is attached to the side of the short side 113 of the photovoltaic panel 11, and the second limiting plate 83 is attached to the side of the long side 112 of the photovoltaic panel 11. The housing of the snow sweeping motor 4 is fixedly connected to the base plate 81.

[0048] Understandably, when the snow sweeping brush 5 of the snow sweeping mechanism swings along the surface of the photovoltaic panel 11, the first limiting plate 82 is attached to the side of the short side 113 of the photovoltaic panel 11, and the second limiting plate 83 is attached to the side of the long side 112 of the photovoltaic panel 11. This can limit the mounting base 8 from tilting up, prevent the snow sweeping mechanism from shifting position during operation, and ensure the stability and working accuracy of the snow sweeping mechanism.

[0049] In one embodiment, the base plate 81 is provided with a buckle (not shown in the figure), and the bottom of the photovoltaic panel 11 is provided with a groove (not shown in the figure) with an opening facing the base plate 81, and the buckle is engaged in the groove.

[0050] When the snow removal mechanism is installed on the photovoltaic panel 11, the installation position of the mounting base 8 can be quickly positioned through the cooperation of the buckle and the groove. The positioning is accurate, the operation is convenient and reliable, and the installation efficiency is improved.

[0051] In other embodiments, a snow-sweeping mechanism can be installed on the photovoltaic panel 11 located in the middle of the photovoltaic string 1. Of course, in actual use, the installation position of the snow-sweeping mechanism and the number of photovoltaic panels 11 equipped with the snow-sweeping mechanism can be flexibly adjusted.

[0052] In other embodiments, the snow removal mechanism may include a motor, a lead screw and nut mechanism, and a snow removal brush 5. The lead screw and nut mechanism includes a lead screw, a slider, and a guide rod. The guide rod is fixed to the frame of the photovoltaic panel 11 and is used to guide the slider on the lead screw to move linearly. The motor drives the lead screw to rotate, thereby driving the slider on the lead screw to move. In turn, the slider drives the snow removal brush 5 to move along the surface of the photovoltaic panel 11 to remove snow from the photovoltaic panel 11.

[0053] In other embodiments, the transmission mechanism may include a connecting rod. The snow sweeping motor 4 is disposed on the side of the photovoltaic panel 11. One end of the connecting rod is connected to the output end of the snow sweeping motor 4, and the other end of the connecting rod is hinged to one end of the snow sweeping brush 5. The other end of the snow sweeping brush 5 is rotatably connected to the frame of the photovoltaic panel 11. When the snow sweeping motor 4 rotates, the connecting rod drives the snow sweeping brush 5 to swing back and forth on the surface of the photovoltaic panel 11.

[0054] In addition, one embodiment of the present invention provides a snow removal method for a photovoltaic power station, which uses the snow removal system for a photovoltaic power station in any of the above embodiments and includes the following steps: S1. The sensing device monitors the power generation of the solar panel. It should be noted that the sensing device only operates during the set time of daytime, such as from 8:00 AM to 5:00 PM, to detect the power generation of the solar panel. At night, it can automatically enter a shutdown state or a low-power sleep state.

[0055] S2. When the sensing device detects that the power generation of the solar panel is less than or equal to a preset value, the energy storage device supplies power to the snow removal mechanism to start the snow removal mechanism installed on at least N photovoltaic panels 11 of each photovoltaic string 1. S3. The snow-sweeping mechanism removes the snow from the corresponding photovoltaic panels 11. The N photovoltaic panels 11 with the snow removed are powered by a single circuit 3, while the snow on the remaining photovoltaic panels 11 is melted by heating. It should be noted that during the snow melting process, the snow-sweeping mechanism does not stop sweeping to ensure that the snow on the corresponding photovoltaic panels 11 is removed and that snow continues to fall on the photovoltaic panels 11, thereby ensuring the power generation of the corresponding photovoltaic panels 11.

[0056] It is understandable that each photovoltaic string 1 has M photovoltaic panels 11 connected in series, and the positive terminal of the photovoltaic string 1 is connected to the positive terminal of the inverter 2, and the negative terminal of the photovoltaic string 1 is connected to the negative terminal of the inverter 2, forming a single circuit 3. When the photovoltaic panels 11 of the photovoltaic power station receive sunlight normally, the inverter 2 converts the DC power of the single circuit 3 into AC power and transmits it to the power grid.

[0057] Each photovoltaic string 1 has N photovoltaic panels 11 equipped with a snow-sweeping mechanism. When the photovoltaic power station is generating electricity normally, the snow-sweeping mechanism does not work. The solar panels of the power generation device receive sunlight, convert solar energy into electrical energy, and send it to the energy storage device for storage, which is then used to power the snow-sweeping mechanism.

[0058] When continuous snowfall causes the photovoltaic panels 11 of the photovoltaic power station and the solar panels of the power generation device to be covered by snow, and the sensing device detects that the power generation power of the power generation device is less than or equal to a preset value, both the solar panels and the photovoltaic power station can no longer generate electricity normally. At this time, the sensing device sends a signal to the energy storage device. After receiving the signal, the energy storage device supplies power to the snow removal mechanism, which starts to remove the snow from the corresponding photovoltaic panel 11. The photovoltaic panels 11 without a snow removal mechanism are still covered by snow. The photovoltaic panels 11 with the snow removed receive sunlight and begin to generate electricity normally. The photovoltaic panels 11 with the snow removed act as the power source for the single circuit 3, causing the single circuit 3 to generate current. The photovoltaic panels 11 with the snow not removed act as the load for the single circuit 3. When the current passes through the photovoltaic panels 11 with the snow not removed, heat is generated, and the temperature rises, causing the adhesive layer of snow attached to the surface of the photovoltaic panel 11 to melt, so that the snow can slide off, realizing self-heating snow melting. There is no need for personnel to go to the site to carry out snow removal work, nor is there a need for external energy supply.

[0059] Moreover, as some of the snow on the photovoltaic panel 11 slides off, the power generation of most of the photovoltaic panels 11 increases, the current in the single circuit 3 gradually increases, and the temperature of the photovoltaic panel 11 corresponding to the part where the snow has not slid off will rise to a higher temperature so that the snow melts completely and the entire photovoltaic power station operates normally. The snow removal mechanism stops snow removal when the energy storage device runs out of power, or when the sensing device detects that the solar panel has started generating electricity, it sends a signal to the energy storage device again, and the energy storage device stops supplying power to the snow removal mechanism.

[0060] The snow removal method utilizes a dedicated power generation device to generate electricity for an energy storage device, which in turn powers the snow removal mechanism. The snow removal device operates independently of the photovoltaic power station, without interfering with it. This modular design facilitates installation in various photovoltaic power stations, offering good portability and scalability. Furthermore, the snow removal mechanism only needs to be installed on a portion of the photovoltaic panels 11 within the photovoltaic string 1. First, the snow removal mechanism clears snow from the corresponding individual photovoltaic panel 11. Then, the cleared photovoltaic panel 11 powers the entire single-branch circuit 3. The uncleared photovoltaic panels 11 generate heat when current flows through them, melting the accumulated snow through self-heating. This snow removal method has no requirements regarding the arrangement of multiple photovoltaic panels 11 within the photovoltaic power station and is not limited by the application scenario.

[0061] Moreover, the snow removal system uses a snow removal mechanism to remove snow from a few photovoltaic panels 11. The photovoltaic panels 11 that have been cleared of snow generate electricity, which causes the remaining photovoltaic panels 11 on a single circuit 3 to heat up and melt the snow. This overturns the traditional method of using large-scale mobile snow removal equipment. The snow removal mechanism only needs to clear snow from a single photovoltaic panel 11, the snow removal area is small, and the size of the snow removal mechanism is small, making it easy to promote.

[0062] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A snow removal system for a photovoltaic power station, used for snow removal in the photovoltaic power station, wherein the photovoltaic power station includes at least one photovoltaic string, each photovoltaic string includes M photovoltaic panels connected in series, and each photovoltaic string is connected in series with an inverter to form a single circuit; characterized in that, The snow removal system for the photovoltaic power station includes a snow removal device, which includes a sensing device, a power generation device, an energy storage device, and a snow removal mechanism. At least N photovoltaic panels in each photovoltaic string are respectively equipped with the snow removal mechanism; wherein, M > N, N ≥ 1; The power generation device includes a solar panel for generating electricity, and an energy storage device for storing the electrical energy transmitted by the solar panel. The energy storage device and the power generation device are respectively connected to the sensing device for signal transmission. When the sensing device detects that the power generation of the solar panel is less than or equal to a preset value, the energy storage device supplies power to the snow removal mechanism. The snow removal mechanism is used to remove the snow on the corresponding photovoltaic panel so that the N photovoltaic panels with the snow removed supply power to the single circuit, thereby heating and melting the snow on the remaining photovoltaic panels.

2. The snow removal system for photovoltaic power plants according to claim 1, characterized in that, Each photovoltaic string has M photovoltaic panels arranged in an array along a first direction, and the photovoltaic panel located at the end of the photovoltaic string along the first direction is provided with the snow sweeping mechanism, N=1.

3. The snow removal system for photovoltaic power plants according to claim 2, characterized in that, The photovoltaic strings are provided in multiple ways, and the photovoltaic panels of the multiple photovoltaic strings are arranged side by side along the second direction. Each photovoltaic string is connected in series with the inverter to form a single circuit. Each photovoltaic string is provided with a snow removal device at its end along the first direction.

4. The snow removal system for photovoltaic power plants according to claim 1, characterized in that, The snow removal mechanism includes a snow removal motor, a transmission mechanism, and a snow removal brush. The snow removal motor drives the snow removal brush to swing back and forth along the surface of the photovoltaic panel through the transmission mechanism.

5. The snow removal system for photovoltaic power plants according to claim 4, characterized in that, The transmission mechanism includes a rotating shaft and a bearing assembly. The snow sweeping motor is located below the photovoltaic panel, and the extension direction of the rotating shaft is perpendicular to the surface of the photovoltaic panel. The bearing assembly includes an inner ring and an outer ring. The inner ring is located inside the outer ring and is coaxially arranged with the outer ring. One end of the rotating shaft is connected to the output end of the snow sweeping motor, and the other end of the rotating shaft extends upward from the photovoltaic panel and is inserted and fixed to the inner ring. One end of the snow sweeping brush is fixed to the outer ring. The snow sweeping motor is used to drive the rotating shaft to rotate, thereby causing the snow sweeping brush to swing back and forth along the surface of the photovoltaic panel.

6. The snow removal system for photovoltaic power plants according to claim 5, characterized in that, The photovoltaic panel is square and is arranged at an angle along its long side. The photovoltaic panel has a low end side located on one side of its long side. The snow sweeping mechanism is located at the corner of the low end side of the photovoltaic panel. The photovoltaic panel has a long side side and a short side side adjacent to its corner. The snow sweeping motor is used to drive the snow sweeping brush to swing back and forth between an initial position and a working position. In the initial position, the snow sweeping brush is located on the lower end side of the photovoltaic panel and close to the edge of the short side. In the working position, the snow sweeping brush swings to the long side side of the photovoltaic panel and close to the edge of the photovoltaic panel.

7. The snow removal system for photovoltaic power plants according to claim 6, characterized in that, The snow sweeping mechanism also includes a mounting base, which includes a base plate, a first limiting plate, and a second limiting plate. The base plate is fixed to the bottom surface of the photovoltaic panel, and the first and second limiting plates are fixed to the top surface of the base plate. The first limiting plate is attached to the side of the photovoltaic panel on its short side, and the second limiting plate is attached to the side of the photovoltaic panel on its long side. The housing of the snow sweeping motor is fixedly connected to the base plate.

8. The snow removal system for photovoltaic power plants according to claim 7, characterized in that, The base plate is provided with a buckle, and the bottom of the photovoltaic panel is provided with a groove with an opening facing the base plate, and the buckle is engaged in the groove.

9. A snow removal method for a photovoltaic power station, using the snow removal system for a photovoltaic power station as described in any one of claims 1 to 8, characterized in that, include: The sensing device monitors the power generation of the solar panel; When the sensing device detects that the power generation of the solar panel is less than or equal to a preset value, the energy storage device supplies power to the snow removal mechanism to activate the snow removal mechanism installed on at least N of the photovoltaic panels in each photovoltaic string. The snow removal mechanism removes the snow from the corresponding photovoltaic panel. The N photovoltaic panels with the snow removed supply power to the single circuit, while the snow on the remaining photovoltaic panels is heated and melted.

10. The snow removal method for photovoltaic power plants according to claim 9, characterized in that, The sensing device monitors the power generation of the solar panel, specifically including: The sensing device operates during a set time of day to monitor the power generation of the solar panel.

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