CN205701624U - Photovoltaic module packet type automatic cleaning system - Google Patents

Abstract

The utility model discloses a photovoltaic component grouping type automatic cleaning system, which comprises a water flushing system, an air cleaning system and a plurality of photovoltaic cleaning units arranged side by side; There is a high-pressure water pump on the connecting pipe between them; the air cleaning system includes an air compressor and a pressure equalizing air pipe; the photovoltaic cleaning unit includes a water cleaning main pipe connected to the pressure equalizing water pipe and an air cleaning main pipe connected to the pressure equalizing air pipe; the photovoltaic cleaning unit It also includes a cleaning mechanism arranged side by side; the cleaning mechanism includes two guide rails respectively arranged correspondingly, and sliders are respectively arranged on the two guide rails, a water spray pipe and an air spray pipe are arranged between the two slide blocks, and a water spray pipe is provided on the water spray pipe. The water spraying slot is provided with an air spraying slot on the air spraying pipe; the water spraying pipe is connected with the water cleaning main pipe, and the air spraying pipe is connected with the air cleaning main pipe; the photovoltaic bracket is provided with a driving mechanism for driving the slider to slide along the guide rail.

Description

Photovoltaic module group automatic cleaning system

technical field

The utility model belongs to the technical field of photovoltaic power stations, and in particular relates to a photovoltaic module grouping type automatic cleaning system.

Background technique

As a clean energy source, photovoltaic power generation has developed rapidly at home and abroad in recent years. However, the dust coverage in the air has a great impact on the energy conversion of photovoltaic panels, which has become a difficult problem restricting photovoltaic power generation. The US "Opportunity" Mars rover faced this problem during its mission. During the six years from 2004 to 2010, its power was attenuated by 1/3 due to dust coverage. Similarly, both rooftop photovoltaic power plants and ground photovoltaic power plants are faced with the situation of module dust accumulation, and dust is one of the key factors affecting the power generation of photovoltaic power plants.

The impact of dust on photovoltaic modules mainly includes:

1. The dust on the surface of the photovoltaic cell will block the sun's rays from shining on the module, reducing the amount of solar radiation projected on the surface of the photovoltaic cell, thereby reducing the power generation of the photovoltaic module;

2. When there is dust on the surface of the photovoltaic module, the long-term sunlight will cause the temperature of the covered part of the module surface to be much higher than that of the unshielded part. When the temperature is too high, there will be dark spots of burnt - hot spots. The hot spot effect is an important factor affecting the output power and service life of photovoltaic modules, which can lead to permanent damage such as dark spots caused by local burning of photovoltaic cells, melting of solder joints and aging of packaging materials, and may even lead to safety hazards;

3. The surface of the photovoltaic cell cover is mostly made of glass. The main components of glass are silica and limestone. Alkaline reaction. As the time of the glass in an acidic or alkaline environment increases, the glass surface will be eroded slowly, resulting in pits and pits on the surface, resulting in diffuse reflection of light on the surface of the cover plate, and the uniformity of transmission in the glass will be destroyed. .

A photovoltaic power station in San Diego, USA, conducted a study on the power generation loss rate caused by dust. There was no rainfall during May 15th to August 29th, and the dust-induced loss rate of photovoltaic power plant power generation has been increasing, with a peak of 22%. This also means that on August 29, about 22% of the power generation was lost due to dustfall.

In order to overcome the impact of dust coverage on the power generation of photovoltaic modules, the current cleaning methods of photovoltaic modules mainly include the following three types.

1. Manual cleaning: manual cleaning methods include manual scrubbing, direct spray water cleaning, compressed air blowing, etc.

Manual scrubbing is the most primitive component cleaning method, which is completed entirely by manpower. This cleaning method has low work efficiency, long cleaning cycle, high labor cost, and hidden dangers to personal safety.

Direct spray water cleaning uses a high-pressure nozzle connected to a water wheel (or water pipe) to spray water on the surface of the photovoltaic module to wash it, so as to achieve the purpose of cleaning. This cleaning method is obviously better than manual scrubbing, and the cleaning efficiency is higher, but it still has the disadvantages of large water consumption and cleaning efficiency that cannot meet the requirements of large-scale photovoltaic power generation.

Compressed air blowing is to blow out compressed air through a special device to remove dust on the surface of components, and is used in areas where water resources are scarce. This method is inefficient and has the problem of dust and high-speed friction components, so it is rarely used in power stations at present.

2. Semi-automatic cleaning method: Semi-automatic cleaning is to realize the cleaning of photovoltaic modules by manually operating a special cleaning car washing device. Semi-automatic cleaning methods include both water cleaning and non-water cleaning, and are less dependent on water resources, but have strict requirements on the height, width, and road conditions between arrays of photovoltaic modules, which cannot meet the application requirements of all large-scale photovoltaic power plants. .

3. Automatic cleaning method: The automatic cleaning method is to install the cleaning device on the photovoltaic module array, and control the rotation of the motor through the program to realize the automatic cleaning of the photovoltaic module by the device. This cleaning method is expensive and complex in design. It is mostly used in research and development and testing, and is rarely used in large-scale photovoltaic power plants. However, with the reduction of its cost, it may replace the non-automatic cleaning method in the future, which is the development trend of photovoltaic power plant component cleaning in the future.

Contents of the invention

In view of this, the purpose of this utility model is to provide a grouped automatic cleaning system for photovoltaic modules, which can meet the requirements for automatic cleaning of photovoltaic modules, and has the advantages of simple structure, low cost and suitable for large-scale photovoltaic power plants.

In order to achieve the above object, the utility model provides the following technical solutions:

A grouped automatic cleaning system for photovoltaic modules, including a water flushing system, an air cleaning system, and a plurality of photovoltaic cleaning units arranged side by side; the water flushing system includes a cleaning pool and a pressure equalizing pipe, and the cleaning pool and the pressure equalizing A high-pressure water pump is provided on the connecting pipe between the water pipes; the air cleaning system includes an air compressor and an equalizing air pipe connected to the air compressor;

The photovoltaic cleaning unit includes a water cleaning main pipe connected to the pressure equalizing water pipe and an air cleaning main pipe connected to the pressure equalizing air pipe; a water cleaning control main valve is provided between the water cleaning main pipe and the pressure equalizing water pipe , an air cleaning control master valve is provided between the air cleaning main pipe and the pressure equalizing air pipe; and the photovoltaic cleaning unit also includes a cleaning mechanism arranged side by side;

The cleaning mechanism includes two guide rails correspondingly arranged on the photovoltaic brackets located on both sides of the photovoltaic module. The two guide rails are respectively provided with sliders that slide and cooperate with them. The water spray pipe and the air spray pipe above the photovoltaic module, the water spray pipe is provided with a water spray slit for spraying high-pressure water towards the photovoltaic module at intervals, and the air spray pipe is provided with a high-pressure water spray toward the photovoltaic assembly at intervals. Air jet slit; the water spray pipe is connected to the water cleaning main pipe, the air spray pipe is connected to the air cleaning main pipe, and a water cleaning control valve is arranged between the water spray pipe and the water cleaning main pipe , an air cleaning control valve is provided between the air spray pipe and the air cleaning main pipe; the photovoltaic bracket is provided with a device for driving the slider to slide along the guide rail and make the water spray pipe and the air spray pipe A drive mechanism for reciprocating motion above the photovoltaic module.

Further, a water cleaning control valve is provided between each of the water spray pipes and the water cleaning main pipe, and an air cleaning control valve is provided between each of the air spray pipes and the air cleaning main pipe.

Further, the main water cleaning control valve, the main air cleaning control valve, the water cleaning control valve and the air cleaning control valve all use electromagnetic reversing valves.

Further, it also includes a water circulation system, the water circulation system includes a sewage sedimentation tank and a water collection tank arranged under the photovoltaic module, a water collection pipe is provided between the water collection tank and the sewage sedimentation tank to connect, and the sewage sedimentation tank A water pump is provided to pump the settled clear water to the clean pool.

Further, the water pump is provided with a water pump inlet pipe, and a suspension water inlet device is provided on the water pump inlet pipe, and the suspension water inlet device includes a suspension housing fixedly installed on the water pump inlet pipe, and the suspension housing A counterweight is provided at the bottom of the body, and a filter screen is provided at the water inlet of the water pump inlet pipe.

Further, a turbidity meter electrically connected to the controller is installed in the sewage sedimentation tank.

Further, the included angle between the high-pressure water sprayed by the water spray slit and the photovoltaic module, and the high-pressure air sprayed by the air spray slit and the photovoltaic module are equal, and are 20-40°.

Further, hoses are provided between the water spray pipe and the water cleaning main pipe, and between the air spray pipe and the air cleaning main pipe.

Further, the pressure equalizing water pipe is provided with a water discharge switch, and the pressure equalizing air pipe is provided with an air discharge switch.

Further, a one-way valve I is provided between the high-pressure water pump and the equalizing water pipe, and a one-way valve II is arranged between the air compressor and the equalizing air pipe.

The beneficial effects of the utility model are:

1. A water flushing system and an air cleaning system are set up. When cleaning, first use the water flushing system to clean the photovoltaic modules, and then use the air cleaning system to dry the photovoltaic modules, so as to avoid damage caused by separate air cleaning. Dust leaves wear marks on the surface of photovoltaic modules, and it can also avoid the problem that water droplets are easy to stick to dust on photovoltaic modules after water cleaning.

2. The water flushing system and air cleaning system adopt hierarchical grouping control, and the photovoltaic modules are grouped and cleaned, which is easy to realize the control of cleaning pressure; thus ensuring that the cleaning water pressure and air pressure will not cause pressure drop and pressure transmission due to excessive pipe network issues such as delays.

3. The water spray slit and the air spray slit are respectively set on the water spray pipe and the air spray pipe. Compared with the existing technology of setting multiple nozzles, the structure is simpler and the cost is lower, and it can effectively improve the spray uniformity of water and air. degree, improve the cleaning effect.

4. By setting up a water circulation system, it is possible to recycle cleaned sewage and receive rainwater. In this way, water can be effectively saved and costs can be reduced; by setting a turbidity meter in the sewage sedimentation tank and a suspended water inlet device on the water pump, it can be effectively avoided. Pumps dirty water into clean pools.

Description of drawings

In order to make the purpose, technical solutions and beneficial effects of the utility model clearer, the utility model provides the following drawings for illustration:

Fig. 1 is a structural schematic diagram of an embodiment of a grouped automatic cleaning system for photovoltaic modules of the present invention;

Fig. 2 is the structural representation of cleaning mechanism;

Figure 3 is a schematic diagram of the structure between the high-pressure water injection direction and the high-pressure air injection direction and the photovoltaic module;

Fig. 4 is a schematic structural view of the suspended water inlet device;

Fig. 5 is a structural schematic diagram of a cleanliness sensor of a photovoltaic module;

Fig. 6 is a functional block diagram of the automatic cleaning control system.

Explanation of reference signs:

1-Clean pool; 2-Equalizing water pipe; 3-Connecting pipe; 4-High pressure water pump; 5-Air compressor; 6-Equalizing air pipe; 7-Water cleaning main pipe; 8-Air cleaning main pipe; 9-Water cleaning control Main valve; 10-air cleaning control main valve; 11-photovoltaic module; 12-photovoltaic support; 13-guide rail; 14-slider; 15-spray pipe; Air cleaning control valve; 19-water discharge switch; 20-air release switch; 21-one-way valve Ⅰ; 22-one-way valve Ⅱ; 23-controller; 24-pressure sensor Ⅰ; 25-pressure sensor Ⅱ; 26-cleaning 27-data collector; 28-high pressure water pump control circuit; 29-compressor control circuit; 30-drive mechanism control circuit; 31-comparison guide rail; 32-comparison slider; 33-comparison water spray pipe; 34-contrast jet pipe; 35-sewage sedimentation tank; 36-water collection tank; 37-water collection pipe; 38-water pump; 39-water pump inlet pipe; 40-suspension water inlet device; 41-suspension shell; ; 43-filter; 44-turbidimeter; 45-hose.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the examples given are not intended to limit the utility model.

As shown in FIG. 1 , it is a schematic structural diagram of an embodiment of the group-type automatic cleaning system for photovoltaic modules of the present invention. The group-type automatic cleaning system for photovoltaic modules in this embodiment includes a water flushing system, an air cleaning system, and a plurality of photovoltaic cleaning units arranged side by side. The water flushing system includes a cleaning pool 1 and a pressure equalizing water pipe 2, and a high pressure water pump 4 is arranged on a connecting pipe 3 between the cleaning pool 1 and the pressure equalizing water pipe 2. The air cleaning system includes an air compressor 5 and an equalizing air pipe 6 connected with the air compressor 5 .

The photovoltaic cleaning unit of this embodiment includes a water cleaning main pipe 7 connected to the pressure equalizing water pipe 2 and an air cleaning main pipe 8 connected to the pressure equalizing air pipe 6 . Water cleaning main pipe 7 is provided with water cleaning main valve 9, and air cleaning main pipe 8 is provided with air cleaning main valve 10. In addition, the photovoltaic cleaning unit also includes cleaning mechanisms arranged side by side. The cleaning mechanism of this embodiment includes two guide rails 13 respectively correspondingly arranged on the photovoltaic brackets 12 located on both sides of the photovoltaic module 11. The two guide rails 13 are respectively provided with sliders 14 that slide and cooperate with them. Between the two sliders 14 The water spray pipe 15 and the air spray pipe 16, both located above the photovoltaic module 11, are arranged between them. The water spray pipe 15 is provided with a water spray slit for spraying high-pressure water toward the photovoltaic module 11. jet slit. By setting the water spray slit and the air spray slit on the water spray pipe and the air spray pipe respectively, the uniformity of water and air spray can be effectively improved, and the cleaning effect can be improved. Water spray pipe 15 links to each other with water cleaning main pipe 7, and air spray pipe 16 links to each other with air cleaning main pipe 8. The photovoltaic bracket 12 is provided with a driving mechanism for driving the slider 14 to slide along the guide rail 13 and make the water spray pipe 15 and the air spray pipe 16 reciprocate above the photovoltaic module 11 . The driving mechanism of this embodiment adopts electric control, and the power unit adopts a motor.

In the group-type automatic cleaning system of photovoltaic modules in this embodiment, by setting a water flushing system, an air cleaning system, and a plurality of photovoltaic cleaning units arranged side by side, the photovoltaic modules of a photovoltaic power station can be divided into multiple groups for cleaning respectively. It can effectively guarantee the cleaning water pressure and air pressure; when cleaning, first use the water flushing system to clean the photovoltaic modules, and then use the air cleaning system to dry the photovoltaic modules, so as to avoid the dust caused by separate air cleaning in the photovoltaic Wear marks are left on the surface of the module, and it can also avoid the problem of water droplets on the photovoltaic module after water cleaning, which is easy to stick to dust.

Specifically, a water cleaning control valve 17 is provided between each water spray pipe 15 and the water cleaning main pipe 7 of the present embodiment, and an air cleaning control valve is provided between each air spray pipe 16 and the air cleaning main pipe 8. 18. In this way, a single photovoltaic module 11 can be cleaned. The main water cleaning control valve 9, the main air cleaning control valve 10, the water cleaning control valve 17 and the air cleaning control valve 18 of this embodiment all adopt electromagnetic reversing valves. The angle between the high-pressure water sprayed by the water spray slot and the photovoltaic module 11, and the angle between the high-pressure air sprayed by the air spray slot and the photovoltaic module 11 are equal, and are 20-40°. The water spray slot of this embodiment sprays The included angle between the high-pressure water and the photovoltaic module 11, and the included angle between the high-pressure air jetted from the air jet slit and the photovoltaic module 11 are both 30°. The equalizing water pipe 2 is provided with a drain switch 19, and the equalizing air pipe 6 is provided with an air release switch 20, and the water drain switch 19 and the air release switch 20 are used for discharging water and deflation during maintenance, which is convenient for maintenance. A one-way valve I21 is provided between the high-pressure water pump 4 and the pressure-equalizing water pipe 2 , and a one-way valve II22 is provided between the air compressor 5 and the pressure-equalizing air pipe 6 . Between the water spray pipe 15 and the water cleaning main pipe 7, and between the air spray pipe 16 and the air cleaning main pipe 8, a hose 45 is provided, which can be kept connected when the slider 14 moves. Limiting devices are also provided at both ends of the guide rail 13 in this embodiment.

Further, the group-type automatic cleaning system of photovoltaic modules in this embodiment also includes a water circulation system. The water circulation system includes a sewage sedimentation tank 35 and a water collection tank 36 arranged below the photovoltaic module 11. A collection tank 36 and the sewage sedimentation tank 35 are provided. The water pipe 37 is connected to each other, and the sewage settling tank 35 is provided with a water pump 38 for pumping the settled clear water to the clean pool. The water pump 38 of this embodiment is provided with a water pump inlet pipe 39, and the water pump inlet pipe 39 is provided with a suspension water inlet device 40. The suspension water inlet device 40 includes a suspension housing 41 fixedly installed on the water pump inlet pipe 39, and the suspension housing The bottom of 41 is provided with counterweight 42, and the water inlet place of water pump inlet pipe 39 is provided with strainer 43. The suspension shell 41 of this embodiment has a pyramid structure with a large top and a small bottom, which can ensure that the suspended water inlet device 40 can be suspended in water. Moreover, the sewage sedimentation tank 35 of this embodiment is provided with a turbidimeter 44 electrically connected to the controller 23 . Specifically, the automatic cleaning control system further includes a water pump control circuit electrically connected to the controller 23 , and the water pump control circuit is electrically connected to the water pump 38 to control the water pump 38 . By setting up a water circulation system, it is possible to recycle the cleaned sewage and receive rainwater, thus effectively saving water and reducing costs. By installing a turbidity meter in the sewage sedimentation tank and installing a suspended water inlet device on the water pump, it is possible to effectively avoid pumping dirty water into the tank for cleaning.

Specifically, the group-type automatic cleaning system for photovoltaic modules in this embodiment can also be provided with an automatic cleaning control system. The automatic cleaning control system includes a controller 23, a pressure sensor I24 installed in the pressure equalizing water pipe 2, and a pressure sensor I24 installed in the pressure equalizing air pipe 6. The pressure sensor Ⅱ25 and the cleanliness sensor of photovoltaic modules. The photovoltaic module cleanliness sensor of the present embodiment comprises the cleanliness contrast photovoltaic module 26 that keeps clean state all the time and the data collector 27 that is electrically connected with controller 23, and data collector 27 collects the output per unit area of cleanliness contrast photovoltaic module 26 respectively power and the output power per unit area of the photovoltaic modules 11 in each photovoltaic cleaning unit, and transmit the collected data to the controller 23. The controller 23 is electrically connected to the high-pressure water pump 4 and is used to control the high-pressure water pump 4. The high-pressure water pump control circuit 28, the compressor control circuit 29 electrically connected to the air compressor 5 and used to control the air compressor 5, and the drive mechanism control circuit 30 electrically connected to the power device of the drive mechanism and used to control the action of the drive mechanism. The main water cleaning control valve 9, the main air cleaning control valve 10, the water cleaning control valve 17, the air cleaning control valve 18, the pressure sensor I24 and the pressure sensor II25 are all electrically connected to the controller. The controller 23 further judges whether each group of photovoltaic modules 11 needs to be cleaned according to the data received from the data collector, and then formulates a corresponding cleaning plan to clean the photovoltaic modules 11 by group.

Specifically, the two sides of the photovoltaic support of the cleanliness comparison photovoltaic module of this embodiment are respectively provided with contrasting guide rails 31, and contrasting guide rails 31 are provided with contrasting sliders 32, and contrasting water spraying is provided between the two contrasting sliders 32. Pipe 33 and contrast air spray pipe 34, the contrast water spray pipe 33 is provided with the contrast water spray slit that sprays cleaning water towards the cleanliness contrast photovoltaic module 26, and the contrast air spray pipe 34 is provided with the contrast of cleanliness contrast photovoltaic module 26 jet air. Jet seam. And the included angle between the high-pressure water jetted from the contrasting water spray slit and the cleanliness comparison photovoltaic module 26, and the included angle between the high-pressure air jetted from the contrasting air jet slot and the cleanliness comparison photovoltaic module 26 are equal, and are 20-40° , the included angle between the high-pressure water sprayed by the comparative water spray slit of the present embodiment and the cleanliness comparative photovoltaic module 26, and the included angle between the high-pressure air sprayed by the comparative air jet slit and the cleanliness comparative photovoltaic module 26 are all 30° . A separate high-pressure water pump is connected on the contrast water spray pipe 33 or is connected with the pressure equalizing water pipe 2, and a separate air compressor is also connected on the contrast air spray pipe 34 or is connected with the pressure equalizing air pipe 6. The modules 26 are cleaned to maintain cleanliness compared to the cleanliness of the photovoltaic modules 26 .

By setting up the automatic cleaning control system and using the photovoltaic module cleanliness sensor to compare the output power per unit area of the smooth photovoltaic module with the output power per unit area of each group of photovoltaic modules to be cleaned, it is judged that each group of photovoltaic modules to be cleaned is due to dust. The degree of power generation reduction caused by accumulation, and then formulate a corresponding cleaning plan to achieve the purpose of cleaning according to the plan (the cleaning cost is high, if the power generation does not change much before and after cleaning, there will be no economic benefits).

The above-mentioned embodiments are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present utility model are all within the protection scope of the present utility model. The scope of protection of the utility model shall be determined by the claims.

Claims (10)

1. A photovoltaic module grouping automatic cleaning system, characterized in that: it includes a water flushing system, an air cleaning system and a plurality of photovoltaic cleaning units arranged side by side; the water flushing system includes a cleaning pool and a pressure equalizing water pipe, and the cleaning A high-pressure water pump is arranged on the connecting pipe between the pool and the pressure equalizing water pipe; the air cleaning system includes an air compressor and an equalizing air pipe connected to the air compressor; The photovoltaic cleaning unit includes a water cleaning main pipe connected to the pressure equalizing water pipe and an air cleaning main pipe connected to the pressure equalizing air pipe; a water cleaning control main valve is provided between the water cleaning main pipe and the pressure equalizing water pipe , an air cleaning control master valve is provided between the air cleaning main pipe and the pressure equalizing air pipe; and the photovoltaic cleaning unit also includes a cleaning mechanism arranged side by side; The cleaning mechanism includes two guide rails correspondingly arranged on the photovoltaic brackets located on both sides of the photovoltaic module. The two guide rails are respectively provided with sliders that slide and cooperate with them. The water spray pipe and the air spray pipe above the photovoltaic module, the water spray pipe is provided with a water spray slit for spraying high-pressure water towards the photovoltaic module at intervals, and the air spray pipe is provided with a high-pressure water spray toward the photovoltaic assembly at intervals. Air jet slit; the water spray pipe is connected to the water cleaning main pipe, the air spray pipe is connected to the air cleaning main pipe, and a water cleaning control valve is arranged between the water spray pipe and the water cleaning main pipe , an air cleaning control valve is provided between the air spray pipe and the air cleaning main pipe; the photovoltaic bracket is provided with a device for driving the slider to slide along the guide rail and make the water spray pipe and the air spray pipe A drive mechanism for reciprocating motion above the photovoltaic module. 2. The photovoltaic module grouping type automatic cleaning system according to claim 1, characterized in that: a water cleaning control valve is provided between each of the water spray pipes and the water cleaning main pipe, each of the An air cleaning control valve is arranged between the jet pipe and the air cleaning main pipe. 3. The photovoltaic module group-type automatic cleaning system according to claim 2, characterized in that: the water cleaning control master valve, the air cleaning control master valve, the water cleaning control valve and the air cleaning control valve all use electromagnetic reversing valves . 4. The photovoltaic module group-type automatic cleaning system according to claim 1, characterized in that: it also includes a water circulation system, the water circulation system includes a sewage sedimentation tank and a water collection tank arranged under the photovoltaic module, and the water collection tank A water collection pipe is provided between the sewage sedimentation tank and a water pump is provided on the sewage sedimentation tank to pump the settled clear water to the clean water pool. 5. The photovoltaic module group-type automatic cleaning system according to claim 4, characterized in that: the water pump is provided with a water pump inlet pipe, and the water pump inlet pipe is provided with a suspension water inlet device, and the suspension water inlet device It includes a suspension housing fixedly installed on the water inlet pipe of the water pump, a counterweight is provided at the bottom of the suspension housing, and a filter screen is provided at the water inlet of the water pump inlet pipe. 6 . The group-type automatic cleaning system for photovoltaic modules according to claim 4 , wherein a turbidity meter electrically connected to the controller is installed in the sewage sedimentation tank. 7 . 7. The photovoltaic module group-type automatic cleaning system according to claim 1, characterized in that: the angle between the high-pressure water sprayed by the water spray slit and the photovoltaic module, and the high-pressure air sprayed by the air spray slit The included angle with the photovoltaic module is equal to 20-40°. 8. The photovoltaic module group-type automatic cleaning system according to claim 1, characterized in that: between the water spray pipe and the water cleaning main pipe, and between the air spray pipe and the air cleaning main pipe There are hoses. 9. The group-type automatic cleaning system for photovoltaic modules according to claim 1, characterized in that: the pressure equalizing water pipe is provided with a water release switch, and the pressure equalizing air pipe is provided with an air release switch. 10. The group-type automatic cleaning system for photovoltaic modules according to claim 1, characterized in that: a check valve I is provided between the high-pressure water pump and the pressure-equalizing water pipe, and a check valve I is provided between the air compressor and the pressure-equalizing air pipe. With check valve II.