Automatic cleaning system of roof photovoltaic power station

Abstract

The utility model discloses an automatic cleaning system of a roof photovoltaic power station, a multi-mode cleaning device comprises a control box, a high-pressure rotary spraying mechanism and a sewage recycling and purifying mechanism, a controller is arranged in the control box, and a man-machine interaction display screen connected with the controller is arranged on the control box. A mode selection change-over switch and an electric valve control switch are arranged on the man-machine interaction display screen; a rotating nozzle of the high-pressure rotating spraying mechanism is arranged at the top end of the roof and faces the upper portion of the roof photovoltaic module, the sewage recycling and purifying mechanism recycles and filters cleaning sewage, and filtered supernatant water flows into the water storage pool again to be used by the high-pressure rotating spraying mechanism. The cleaning device is simple in structure, high in cleaning efficiency, good in cleaning effect, suitable for cleaning a large-area roof photovoltaic power station, suitable for frequent cleaning and long-term use and low in comprehensive cost, and the rotary nozzle is adopted to simulate the artificial rainfall condition to clean the surface of the roof photovoltaic module.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to an automatic cleaning system for a roof photovoltaic power station. Background Art

[0002] The operation and maintenance of photovoltaic power stations, especially the periodic cleaning of photovoltaic modules, is the key to increasing the power generation of photovoltaic power stations and thus ensuring the returns of investors. In the context of my country entering the dual-carbon era, the installation of distributed photovoltaic power stations on the roofs of large industrial plants has become a normalized behavior. Many industrial plant roofs are equipped with many exhaust chimneys. Some of these companies have a large amount of fine dust flying in the roof environment due to inadequate dust treatment in the exhaust gas or low industry standards, which leads to serious dust accumulation problems for photovoltaic modules installed on the roof. Some companies are unaware of the importance of dust cleaning, which has seriously damaged their power generation revenue, with a loss of up to 30% to 40% of power generation. In order to avoid the loss of power generation, the existing cleaning methods are as follows: 1. Arrange employees to perform periodic manual cleaning, but there are certain safety hazards for non-professionals to operate, and it is also difficult to achieve frequent cleaning; 2. Entrust a third party to clean, the cost is very high, and it is also difficult to achieve frequent cleaning; 3. Invest in photovoltaic cleaning robot equipment to clean photovoltaic modules. Because the roof photovoltaic module array is dispersed, multi-dimensional and discontinuous, a large number of photovoltaic cleaning robot equipment must be invested, and the one-time investment cost is high. At the same time, due to dust, the failure rate of photovoltaic cleaning robot equipment is high, and most photovoltaic cleaning robots use brushes for dry cleaning, which easily causes the anti-reflection film layer on the surface of the photovoltaic module to be worn; 4. Invest in portable cleaning robots for wet cleaning, which is costly, and this method still requires manual control, and frequent cleaning operations cannot be guaranteed. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an automatic cleaning system for a roof photovoltaic power station. The system has a simple structure and adopts a rotating nozzle to imitate artificial rainfall to clean the surface of the roof photovoltaic components. The system has high cleaning efficiency and good cleaning effect. The system will not wear the anti-reflection film on the surface of the photovoltaic components and can cool the photovoltaic components to alleviate the influence of high temperature on the power generation efficiency. The system is suitable for the cleaning of large-area roof photovoltaic power stations and is suitable for frequent cleaning and long-term use with low overall cost.

[0004] The technical solution of the utility model is:

[0005] An automatic cleaning system for a roof photovoltaic power station includes a control box, a high-pressure rotary spraying mechanism and a sewage recovery and purification mechanism, wherein the control box is provided with a controller, a wireless communication module and a memory, and the control box is provided with a human-machine interactive display screen and a time controller, the wireless communication module, the memory, the human-machine interactive display screen and the time controller are all connected to the controller, and the human-machine interactive display screen is provided with a mode selection switch and an electric valve control switch, and the mode switching switch includes an emergency stop mode switch, a traditional mode switch and an intelligent mode switch;

[0006] The high-pressure rotary spraying mechanism includes a water reservoir, a high-pressure water pump, a water pump frequency converter, a water inlet pipeline, an electric valve, a rotary nozzle and a camera. The water inlet end of the high-pressure water pump is connected to the water reservoir, and the water outlet end of the high-pressure water pump is connected to the rotary nozzle through the water inlet pipeline. The rotary nozzle is arranged at the top of the roof and the nozzle faces the top of the roof photovoltaic module. The electric valve is arranged at the connection between the water inlet pipeline and the rotary nozzle. The camera is mounted on the top of the roof and its height is higher than the height of the rotary nozzle. The high-pressure water pump is powered by the water pump frequency converter, and the water pump frequency converter is installed in the control box. The water pump frequency converter, the control end of the electric valve, and the camera are respectively connected to the controller;

[0007] The sewage recovery and purification mechanism includes a water collection tank, a circulation pipeline, a filter tank and filter materials. The water collection tank is arranged at the edge of the bottom end of the roof, the filter material is arranged at the bottom end of the filter tank, the top end of the circulation pipeline is connected with the water collection tank, the bottom end of the circulation pipeline extends and is inserted into the filter material and is connected with the bottom of the filter tank, and the top end of the filter tank is provided with an overflow port, and the clear water discharged from the overflow port flows into the water storage tank.

[0008] The top of the roof is provided with a base, the fixed end of the bottom end of the rotating nozzle is positioned on the base, and the rotating angle of the rotating part at the top end of the rotating nozzle is 45-320 degrees.

[0009] A rainwater detection sensor connected to the controller is arranged on the top of the roof, and the height of the rainwater detection sensor is higher than the height at which the rotating sprinkler is arranged.

[0010] The roof photovoltaic assembly is erected on the roof and parallel to the roof, a gap is left between the bottom end of the roof photovoltaic assembly and the roof, and a water guide clip is arranged on the frame of the bottom end of the roof photovoltaic assembly.

[0011] The high-pressure water pump and filter tank are both arranged in the water reservoir. The height of the top of the filter tank is higher than the height of the top of the water reservoir. The top of the filter tank is provided with multiple overflow ports. A liquid level sensor connected to the controller is arranged in the water reservoir. The top of the water reservoir is connected with a drain pipe.

[0012] A row of rotating nozzles is arranged at the top of the roof, and the water inlet pipeline includes a main water inlet pipe and multiple branch water inlet pipes. The bottom end of the main water inlet pipe is connected to the water outlet end of the high-pressure water pump, the top of the main water inlet pipe is a horizontal pipe structure, and the top of the main water inlet pipe is a closed structure. Multiple branch water inlet pipes are arranged in a row and parallel to each other. The water inlet ends of the multiple branch water inlet pipes are connected to the top of the main water inlet pipe, and each rotating nozzle is connected to the water outlet end of a corresponding branch water inlet pipe. The electric valve includes a main electric valve and multiple branch-side electric valves. The main electric valve is arranged on the main water inlet pipe, and the multiple branch-side electric valves are respectively arranged on corresponding branch water inlet pipes.

[0013] The filtering material is selected from quartz sand, medical stone, volcanic stone, activated carbon particles or filter cotton.

[0014] Advantages of the utility model:

[0015] (1) The utility model adopts a high-pressure rotary spraying mechanism composed of a high-pressure water pump and a rotary nozzle to simulate artificial rainfall, clean the roof photovoltaic modules, effectively moisten and flush the dust and floating ash accumulated on the surface of the roof photovoltaic modules, and produce a large area of ​​sewage water film; at the same time, the cleaning water can cool the roof photovoltaic modules, and assist in improving the power generation efficiency of the roof photovoltaic modules. When the temperature of the photovoltaic cell is greater than 25°C, the power of the battery will generally change at a percentage of (-0.3 to -0.34)% / °C. The higher the temperature, the greater the decrease in the power of the photovoltaic cell. The temperature of the photovoltaic cell during operation can generally reach 40 to 70°C, so surface water cooling can effectively reduce the temperature, thereby reducing power generation losses.

[0016] (2) The utility model is provided with a sewage recovery and purification mechanism, which recovers and filters the cleaned sewage and then injects it back into the reservoir, effectively reducing the water cost and avoiding the waste of water resources.

[0017] (3) The utility model adopts a rotating nozzle. The rotating nozzle utilizes the centrifugal effect of the water flow and the driving effect of the reaction force to realize the rotation while spraying water, and adopts the method of spraying upward, which further increases the cleaning area. The rotating nozzle can be arranged in a multi-point manner to further increase the cleaning area. At the same time, it also greatly reduces the working flow requirement of the high-pressure water pump, that is, a smaller power water pump can be selected, which can be more energy-saving and reduce the requirements for equipment management and facilities.

[0018] (4) The utility model is provided with a plurality of control modes, which can realize various modes such as emergency stop, traditional manual control and intelligent control. Intelligent control is adopted in daily life, and no human attendance is required. It can realize automatic start of cleaning, thus avoiding the problem of power generation loss due to long-term non-cleaning.

[0019] (5) The liquid level sensor provided in the utility model detects the water level in the water reservoir in real time, thereby avoiding the waste of resources caused by the continuous startup and idling of the high-pressure water pump, and avoiding the problem of damage caused by the idling of the high-pressure water pump;

[0020] (6) The utility model is provided with a rain detection sensor. When rain is sensed, that is, rain is cleaning the roof photovoltaic components in real time, it is determined that there is no need to start the high-pressure water pump, thereby avoiding the waste of energy and water resources;

[0021] (7) The present invention uses a wet cleaning mode, which does not involve any mechanical cleaning equipment causing friction on the cover glass on the surface of the roof photovoltaic module, thus avoiding damage to the anti-reflection film on the surface of the cover glass;

[0022] (8) The utility model provides a water guide clamp on the frame at the bottom of the roof photovoltaic module, which effectively guides the sewage after cleaning to overflow along the frame of the photovoltaic module onto the roof, thereby achieving the guided discharge of sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Figure 2 It is a schematic diagram of the installation structure of the rotary sprinkler of the utility model.

[0025] Figure 3 The utility model is a structural schematic diagram of a water guide clamp installed on a frame of a roof photovoltaic assembly.

[0026] Figure 4 It is a structural diagram of the utility model in which the rotating nozzles are arranged in rows.

[0027] Figure 5 It is a block diagram of the control principle of the utility model.

[0028] Figure markings: 1-control box, 11-controller, 12-wireless communication module, 13-memory, 14-human-computer interaction display screen, 15-time controller, 16-electric valve control switch, 17-emergency stop mode switch, 18-traditional mode switch, 19-intelligent mode switch, 21-water reservoir, 22-high-pressure water pump, 23-water pump inverter, 24-water inlet pipeline, 241-main water inlet pipe, 242-branch water inlet pipe, 25-electric valve, 251-main electric valve, 252-branch side electric valve, 26-rotating nozzle, 27-camera, 28-rainwater detection sensor, 29-liquid level sensor, 210-drain pipe, 211-base, 31-water collection tank, 32-circulation pipeline, 33-filter tank, 34-filter material, 35-overflow, 4-roof, 5-roof photovoltaic module, 6-water guide clamp. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See Figure 1-Figure 5 , an automatic cleaning system for a roof photovoltaic power station, comprising a control box 1, a high-pressure rotary spraying mechanism and a sewage recovery and purification mechanism, a controller 11, a wireless communication module 12 and a memory 13 are arranged in the control box 1, the wireless communication module 12 is used to connect with a remote control terminal to realize remote control, the memory 13 is used to store control programs and various collected data, a human-machine interactive display screen 14 and a time controller 15 are arranged on the control box 1, the wireless communication module 12, the memory 13, the human-machine interactive display screen 14, and the time controller 15 are all connected to the controller 11, a mode selection switch and an electric valve control switch 16 are arranged on the human-machine interactive display screen 14, and the mode switch includes an emergency stop mode switch 17, a traditional mode switch 18 and an intelligent mode switch 19;

[0031] The high-pressure rotary spraying mechanism includes a water reservoir 21, a high-pressure water pump 22, a water pump inverter 23, a water inlet pipeline 24, an electric valve 25, a rotary nozzle 26, a camera 27 and a rain detection sensor 28. A liquid level sensor 29 is arranged in the water reservoir 21. The top of the water reservoir 21 is connected to a drain pipe 210. When the water level in the water reservoir 21 exceeds the inlet height of the drain pipe 210, the water in the water reservoir 21 is discharged from the drain pipe 210. The high-pressure water pump 22 is arranged in the water reservoir 21. The water inlet end of the high-pressure water pump 22 is connected to the water reservoir 21. The water outlet end of the high-pressure water pump 22 is connected to the rotary nozzle 26 through the water inlet pipeline 24. The rotary nozzle 26 is arranged at the top of the roof 4 and the nozzle faces above the roof photovoltaic module 5. The electric valve 25 is arranged at the inlet. At the connection between the water pipe 24 and the rotating nozzle 26, the camera 27 and the rain detection sensor 28 are all mounted on the top of the roof 4 and their heights are higher than the height at which the rotating nozzle 26 is set. The high-pressure water pump 22 is powered by the water pump inverter 23, and the water pump inverter 23 is installed in the control box 1. The water pump inverter 23, the control end of the electric valve 25, the camera 27, the rain detection sensor 28, and the liquid level sensor 29 are respectively connected to the controller 11, and the human-computer interaction display screen 14 displays the operating status of the high-pressure water pump 22 and the opening and closing status of the electric valve 25 in real time; a base 211 is provided at the top of the roof 4, and the fixed end of the bottom end of the rotating nozzle 26 is positioned on the base 211, and the rotation angle range of the rotating part at the top of the rotating nozzle 26 can be set to 45-320 degrees;

[0032] The sewage recovery and purification mechanism includes a water collection tank 31, a circulation pipeline 32, a filter tank 33 and a filter material 34. The water collection tank 31 is arranged at the edge of the bottom end of the roof 4, the filter tank 33 is arranged in the water reservoir 21, the height of the top of the filter tank 33 is higher than the height of the top of the water reservoir 21, and the filter material 34 is arranged at the bottom end of the filter tank 33. The filter material 34 can be selected from quartz sand, medical stone, volcanic stone, activated carbon particles or filter cotton, etc. The top end of the circulation pipeline 32 is connected to the water collection tank 31, and the bottom end of the circulation pipeline 32 extends and is inserted into the filter material 34 and is connected to the bottom of the filter tank 33. A plurality of overflow ports 35 are arranged at the top of the filter tank 33, and the supernatant water discharged from the overflow port 35 flows into the water reservoir 21.

[0033] The roof photovoltaic assembly 5 is mounted on the roof 4 and is parallel to the roof 4 , a gap is left between the bottom of the roof photovoltaic assembly 5 and the roof 4 , and a water guide clip 6 is provided on the frame of the bottom of the roof photovoltaic assembly 5 .

[0034] According to the arrangement size of the roof photovoltaic components 5, a row of rotating nozzles 26 can be set at the top of the roof 4, the water inlet pipeline 24 includes a main water inlet pipe 241 and multiple branch water inlet pipes 242, the bottom end of the main water inlet pipe 241 is connected to the water outlet end of the high-pressure water pump 22, the top of the main water inlet pipe 241 is a horizontal pipe structure, the top of the main water inlet pipe 241 is a closed structure, multiple branch water inlet pipes 242 are arranged in a row and parallel to each other, the water inlet ends of the multiple branch water inlet pipes 242 are connected to the top of the main water inlet pipe 241, each rotating nozzle 26 is connected to the water outlet end of a corresponding branch water inlet pipe 242, the electric valve 25 includes a main electric valve 251 and multiple branch side electric valves 252, the main electric valve 251 is arranged on the main water inlet pipe 241, and the multiple branch side electric valves 252 are respectively arranged on a corresponding branch water inlet pipe 242.

[0035] A multi-mode cleaning method for roof photovoltaic modules specifically comprises the following steps:

[0036] (1) Emergency stop control mode:

[0037] Press the emergency stop mode switch 17, the controller 11 controls the electric valve 25 to close, and at the same time controls the water pump inverter to stop the high-pressure water pump 22, so that the high-pressure rotary spraying mechanism immediately stops the operation of spraying and cleaning the roof photovoltaic assembly 5;

[0038] (2) Traditional control mode:

[0039] After pressing the traditional mode switch 18, the electric valve control switch 16 is pressed to the open state. At this time, the controller 11 controls the electric valve 25 (the main electric valve 251 and all branch side electric valves 252, or the main electric valve 251 and some branch side electric valves 252) to open, and controls the water pump inverter to start the high-pressure water pump 22. The high-pressure water pump 22 delivers water to the rotating nozzle 26, and the rotating nozzle 26 performs a rotating spraying operation to clean the roof photovoltaic module 5. When the cleaning is completed, the electric valve control switch 16 is pressed to the closed state (the electric valve control switch 16 can selectively control the main electric valve 251 and all branch side electric valves 252, respectively). The electric valve 251 and each branch-side electric valve 252, the selective control of the branch-side electric valve 252 brings the convenience of increasing the amount of watering in a regional area), the electric valve 25 (the main electric valve 251 and all branch-side electric valves 252, or only part of the branch-side electric valves 252) are closed, and the high-pressure water pump 22 stops running at the same time; when the traditional mode switch 18 is pressed, and the time controller 15 is manually set, the controller 11 will control the electric valve 25 to open on time according to the time interval set by the time controller 15, and control the water pump inverter, so that the high-pressure water pump 22 starts running on time to clean the roof photovoltaic components 5;

[0040] (3) Intelligent control mode:

[0041] After the intelligent mode switch 19 is pressed, the camera 27 collects the surface image of the roof photovoltaic assembly 5 in real time, and then sends it to the controller 11. When the controller 11 determines that there is dust accumulation on the surface of the roof photovoltaic assembly 5, the electric valve 25 (the main electric valve 251 and all the branch side electric valves 252, or the main electric valve 251 and some of the branch side electric valves 252) is controlled to open, and the water pump inverter is controlled to start the high-pressure water pump 22, and the high-pressure water pump 22 delivers water to the rotating nozzle 26, and the rotating nozzle 26 performs a rotating spraying operation to clean the roof photovoltaic assembly 5. When the cleaning reaches the set cleaning time, the electric valve 25 (the main electric valve 251 and all the branch side electric valves 252, or only some of the branch side electric valves 252) is closed, and the high-pressure water pump 22 stops supplying water, and the cleaning operation is completed;

[0042] (4) Remote control mode:

[0043] When the controller 11 in the control box 1 receives a remote control signal through the wireless communication module 12, the controller 11 controls the electric valve 25 to open or close according to the remote control signal, and controls the water pump inverter to start or stop the high-pressure water pump 22;

[0044] (5) Liquid level sensor detection mode:

[0045] When the liquid level sensor 29 detects that the water level in the water reservoir 21 is lower than the set minimum water level, and the high-pressure water pump 22 is in the start-up state, the controller 11 controls the electric valve 25 (the main electric valve 251 and all branch-side electric valves 252, or only part of the branch-side electric valves 252) to close, and controls the water pump inverter to stop the high-pressure water pump 22, so that the high-pressure rotary spraying mechanism immediately stops the operation of spraying and cleaning the roof photovoltaic module 5;

[0046] (6) Rain detection mode:

[0047] When the rain detection sensor 28 detects rain, the controller 11 controls the electric valve 25 (the main electric valve 251 and all branch-side electric valves 252, or only some branch-side electric valves 252) to close, and controls the high-pressure water pump 22 to stop running;

[0048] (7) Wastewater recycling:

[0049] While the rotating nozzle 26 is performing the rotating spraying operation, the sewage on the roof photovoltaic module 5 slides down its slope, and then falls into the sump 31, and is transported to the bottom of the filter tank 33 through the circulation pipeline 32. The filter material 34 at the bottom of the filter tank 33 intercepts and adsorbs larger solid particles in the sewage, and the tiny solid particles in the sewage move upward with the water flow and along the gaps between the filter materials 34. Due to the gravity of the fixed particles, the tiny solid particles will gradually settle down in the water layer area above the filter material 34. The clear water after precipitation is always located at the upper part of the water layer area. As the sewage inflow increases, the liquid level of the clear water rises, and finally flows out through the overflow port 35 at the top of the filter tank 33 and enters the reservoir 21 for recycling.

[0050] The priority levels of the above-mentioned multi-mode cleaning are as follows: the emergency stop control mode and the liquid level sensor detection mode both take precedence over the remote control mode and the traditional control mode; the remote control mode and the traditional control mode both take precedence over the rain detection mode; the rain detection mode takes precedence over the camera collection dust accumulation start mode in the intelligent control mode.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic cleaning system for a roof photovoltaic power station, characterized in that: It includes a control box, a high-pressure rotary spraying mechanism and a sewage recovery and purification mechanism. The control box is provided with a controller, a wireless communication module and a memory. The control box is provided with a human-machine interactive display screen and a time controller. The wireless communication module, the memory, the human-machine interactive display screen and the time controller are all connected to the controller. The human-machine interactive display screen is provided with a mode selection switch and an electric valve control switch. The mode switching switch includes an emergency stop mode switch, a traditional mode switch and an intelligent mode switch. The high-pressure rotary spraying mechanism includes a water reservoir, a high-pressure water pump, a water pump frequency converter, a water inlet pipeline, an electric valve, a rotary nozzle and a camera. The water inlet end of the high-pressure water pump is connected to the water reservoir, and the water outlet end of the high-pressure water pump is connected to the rotary nozzle through the water inlet pipeline. The rotary nozzle is arranged at the top of the roof and the nozzle faces the top of the roof photovoltaic module. The electric valve is arranged at the connection between the water inlet pipeline and the rotary nozzle. The camera is mounted on the top of the roof and its height is higher than the height of the rotary nozzle. The high-pressure water pump is powered by the water pump frequency converter, and the water pump frequency converter is installed in the control box. The water pump frequency converter, the control end of the electric valve, and the camera are respectively connected to the controller; The sewage recovery and purification mechanism includes a water collection tank, a circulation pipeline, a filter tank and filter materials. The water collection tank is arranged at the edge of the bottom end of the roof, the filter material is arranged at the bottom end of the filter tank, the top end of the circulation pipeline is connected with the water collection tank, the bottom end of the circulation pipeline extends and is inserted into the filter material and is connected with the bottom of the filter tank, and the top end of the filter tank is provided with an overflow port, and the clear water discharged from the overflow port flows into the water storage tank.

2. The automatic cleaning system for a roof photovoltaic power station according to claim 1, characterized in that: The top of the roof is provided with a base, the fixed end of the bottom end of the rotating nozzle is positioned on the base, and the rotating angle of the rotating part at the top end of the rotating nozzle is 45-320 degrees.

3. The automatic cleaning system for a roof photovoltaic power station according to claim 1, characterized in that: A rainwater detection sensor connected to the controller is arranged on the top of the roof, and the height of the rainwater detection sensor is higher than the height at which the rotating sprinkler is arranged.

4. The automatic cleaning system for a roof photovoltaic power station according to claim 1, characterized in that: The roof photovoltaic assembly is erected on the roof and parallel to the roof, a gap is left between the bottom end of the roof photovoltaic assembly and the roof, and a water guide clip is arranged on the frame of the bottom end of the roof photovoltaic assembly.

5. The automatic cleaning system for a roof photovoltaic power station according to claim 1, characterized in that: The high-pressure water pump and filter tank are both arranged in the water reservoir. The height of the top of the filter tank is higher than the height of the top of the water reservoir. The top of the filter tank is provided with multiple overflow ports. A liquid level sensor connected to the controller is arranged in the water reservoir. The top of the water reservoir is connected with a drain pipe.

6. The automatic cleaning system for a roof photovoltaic power station according to claim 1, characterized in that: A row of rotating nozzles is arranged at the top of the roof, and the water inlet pipeline includes a main water inlet pipe and multiple branch water inlet pipes. The bottom end of the main water inlet pipe is connected to the water outlet end of the high-pressure water pump, the top of the main water inlet pipe is a horizontal pipe structure, and the top of the main water inlet pipe is a closed structure. Multiple branch water inlet pipes are arranged in a row and parallel to each other. The water inlet ends of the multiple branch water inlet pipes are connected to the top of the main water inlet pipe, and each rotating nozzle is connected to the water outlet end of a corresponding branch water inlet pipe. The electric valve includes a main electric valve and multiple branch-side electric valves. The main electric valve is arranged on the main water inlet pipe, and the multiple branch-side electric valves are respectively arranged on corresponding branch water inlet pipes.

7. The automatic cleaning system for a roof photovoltaic power station according to claim 1, characterized in that: The filtering material is selected from quartz sand, medical stone, volcanic stone, activated carbon particles or filter cotton.

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