Photovoltaic module self-cleaning method and photovoltaic module self-cleaning system based on power supply and demand balance

Abstract

The invention relates to the field of photovoltaic technology, in particular to a photovoltaic module self-cleaning method and a photovoltaic module self-cleaning system based on power supply and demand balance. The photovoltaic module self-cleaning method based on electric power supply and demand balance comprises the following steps: under the condition that the periodic average power generation power is smaller than the preset average power generation power, if the real-time load power of a power supply area is smaller than the preset load power, the real-time power generation power is smaller than the preset real-time power generation power; and under the condition that the difference value power between the output power of the photovoltaic power generation assembly and the preset load power is greater than the preset difference value power, controlling the cleaning assembly to clean the photovoltaic power generation assembly, and resetting the difference value power. According to the photovoltaic module self-cleaning method based on power supply and demand balance, the power generation influence on the photovoltaic power generation module is reduced, and the utilization rate of the photovoltaic power generation module is improved to the maximum efficiency, so that the power generation efficiency of the photovoltaic power generation module is improved, and the maintenance cost of the photovoltaic power generation module is reduced.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a photovoltaic component self-cleaning method and a photovoltaic component self-cleaning system based on power supply and demand balance. Background Art

[0002] Solar energy is one of the most common new energy sources for power generation, and it can also avoid the environmental pollution caused by traditional power generation methods. The current solar power generation method is to install large-area solar panels to increase power generation;

[0003] However, due to long-term outdoor use, the solar panels will be covered with dust. When a certain amount of dust accumulates, it will lead to a low light energy reception effect, which in turn affects the efficiency of light energy conversion, so the solar panels need to be cleaned frequently. In the process of cleaning solar panels, most of them are cleaned manually, which has the problem of low cleaning efficiency, which leads to an increase in the maintenance cost of solar panel power generation. At the same time, the cleaning time of solar panels should also take into account the power supply and demand situation, and the cleaning of the photovoltaic self-cleaning system should be realized under the optimal operation of the power system. Summary of the invention

[0004] The objectives of the present invention include, for example, providing a photovoltaic module self-cleaning method and a photovoltaic module self-cleaning system based on power supply and demand balance, which can clean the photovoltaic power generation components at the appropriate time when the power system is running, reduce the impact on the power generation of the photovoltaic power generation components, and maximize the efficiency of the utilization rate of the photovoltaic power generation components, thereby improving the power generation efficiency of the photovoltaic power generation components and reducing the maintenance cost of the photovoltaic power generation components.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a photovoltaic module self-cleaning method based on power supply and demand balance, comprising:

[0007] Receive a power generation signal output by a photovoltaic inverter that represents the power generation power of a photovoltaic power generation component; receive a load power signal output by a load power detection unit that represents the load power of a power supply area;

[0008] Determine the periodic average power generation and real-time power generation of the photovoltaic power generation component within a preset period according to the power generation power signal;

[0009] When the period average power generation is less than the preset average power generation, determine whether the real-time load power of the power supply area is less than the preset load power, and whether the real-time power generation is less than the preset real-time power generation;

[0010] If the real-time load power of the power supply area is less than the preset load power, and the real-time power generation power is less than the preset real-time power generation power, it is determined whether the difference between the output power of the photovoltaic power generation component and the preset load power is greater than the preset difference power;

[0011] When the difference power between the output power of the photovoltaic power generation component and the preset load power is greater than the preset difference power, the cleaning component is controlled to clean the photovoltaic power generation component and reset the difference power.

[0012] In an optional embodiment, the period average power generation is the average power generation of the photovoltaic power generation assembly in one day.

[0013] In an optional implementation manner, the step of determining whether the real-time load power of the power supply area is less than the preset load power includes:

[0014] Determine the active power, reactive power and apparent power of the real-time load in the power supply area according to the load power signal;

[0015] It is determined that one or more of the active power, the reactive power and the apparent power is less than a preset load power.

[0016] In an optional implementation manner, the preset average power generation power is less than or equal to 85%-90% of the rated power of the photovoltaic power generation assembly.

[0017] In an optional implementation manner, the preset load power is 40%-50% of the maximum load power of the power supply area.

[0018] In an optional implementation manner, the preset difference power is 30%-40% of the maximum load power of the power supply area.

[0019] In an optional embodiment, the preset difference power is 1.1 times greater than the power of the cleaning component.

[0020] In a second aspect, the present invention provides a photovoltaic component self-cleaning system, which is used to implement the photovoltaic component self-cleaning method based on power supply and demand balance as in any one of the aforementioned embodiments, and the photovoltaic component self-cleaning system includes a photovoltaic power generation component, a load power detection unit, a cleaning component, a photovoltaic inverter, a control unit and a controller;

[0021] The photovoltaic power generation assembly is arranged in the power generation field, the load power detection unit is used to detect the load power of the user end in the power supply area, and the inverter is used to detect the power generation power of the photovoltaic power generation assembly; the cleaning assembly is arranged in the power generation field and is used to clean the photovoltaic power generation assembly;

[0022] The photovoltaic power generation component, the load power detection unit, the inverter and the cleaning component are all electrically connected to the control unit;

[0023] The control unit is used to execute a photovoltaic component self-cleaning method based on power supply and demand balance.

[0024] In an optional embodiment, the load power detection unit includes multiple load power monitors, which are distributed at the user end of the power supply area, and are used to detect real-time active power, reactive power and apparent power, and transmit a load power signal representing the load power of the power supply area to the control unit.

[0025] In an optional embodiment, the photovoltaic power generation component includes multiple photovoltaic power generation panels, and the multiple photovoltaic power generation panels are arranged in an array in a power generation field; the cleaning component includes multiple cleaning units, and each cleaning unit is used to clean at least one photovoltaic power generation panel in a row or a column.

[0026] The beneficial effects of the embodiments of the present invention include:

[0027] The steps of the photovoltaic component self-cleaning method based on power supply and demand balance include: receiving a power generation signal output by a photovoltaic inverter that represents the power generation power of the photovoltaic power generation component; receiving a load power signal output by a load power detection unit that represents the load power of the power supply area; determining the periodic average power generation power and the real-time power generation power of the photovoltaic power generation component within a preset period according to the power generation signal; when the periodic average power generation power is less than the preset average power generation power, determining whether the real-time load power of the power supply area is less than the preset load power, and whether the real-time power generation power is less than the preset real-time power generation power; if the real-time load power of the power supply area is less than the preset load power, and the real-time power generation power is less than the preset real-time power generation power, determining whether the difference between the output power of the photovoltaic power generation component and the preset load power is greater than the preset difference power; when the difference power between the output power of the photovoltaic power generation component and the preset load power is greater than the preset difference power, controlling the cleaning component to clean the photovoltaic power generation component and reset the difference power.

[0028] This photovoltaic module self-cleaning method based on power supply and demand balance can clean the photovoltaic power generation modules at the appropriate time when the power system is running, reduce the impact on the power generation of the photovoltaic power generation modules and the power consumption of the power consumption area, and maximize the efficiency of the utilization of the photovoltaic power generation modules, thereby improving the power generation efficiency of the photovoltaic power generation modules and reducing the maintenance cost of the photovoltaic power generation modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Schematic diagram of the structure of the photovoltaic module self-cleaning system in an embodiment of the present invention.

[0031] Icons: 100-photovoltaic module self-cleaning system; 10-power plant; 20-user end; 110-photovoltaic power generation module; 111-photovoltaic power generation panel; 120-cleaning module; 121-cleaning unit; 130-inverter; 140-load power detection unit; 150-controller; 160-external display. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0037] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0038] Please refer to Figure 1 This embodiment provides a photovoltaic module self-cleaning method based on power supply and demand balance, including:

[0039] Receive a power generation signal output by the photovoltaic inverter 130 that represents the power generation power of the photovoltaic power generation assembly 110; receive a load power signal output by the load power detection unit 140 that represents the load power of the power supply area;

[0040] Determine the periodic average power generation and real-time power generation of the photovoltaic power generation assembly 110 within a preset period according to the power generation signal;

[0041] When the period average power generation is less than the preset average power generation, determine whether the real-time load power of the power supply area is less than the preset load power, and whether the real-time power generation is less than the preset real-time power generation;

[0042] If the real-time load power of the power supply area is less than the preset load power, and the real-time power generation power is less than the preset real-time power generation power, it is determined whether the difference between the output power of the photovoltaic power generation assembly 110 and the preset load power is greater than the preset difference power;

[0043] When the difference power between the output power of the photovoltaic power generation component 110 and the preset load power is greater than the preset difference power, the cleaning component 120 is controlled to clean the photovoltaic power generation component 110 and reset the difference power.

[0044] It should be noted that within the power plant 10 , the photovoltaic power generation components 110 are affected by dust accumulation, which may cause changes in their power generation efficiency. The amount of dust accumulated on the photovoltaic power generation components 110 is affected by the climate environment. Based on this, the photovoltaic power generation components 110 need to be cleaned.

[0045] The working principle of the photovoltaic module self-cleaning method based on power supply and demand balance is:

[0046] First, the photovoltaic component self-cleaning method based on power supply and demand balance is applied to the power system, which includes the photovoltaic power generation component 110, the user end 20 in the power supply area, and the cleaning component 120. The purpose is to determine the appropriate working time period of the cleaning component 120 according to the power generation power of the photovoltaic power generation component 110 as the power generation and power supply end, and the supply and demand relationship between the load power of the user end 20 in the power supply area, so as to reduce the impact on the power generation state of the photovoltaic power generation component 110 as much as possible when the cleaning component 120 is working, and ensure the power demand of the user end 20 in the power supply area. Specifically, the steps include:

[0047] Receive a power generation signal representing the power generation power of the photovoltaic power generation component 110 output by the photovoltaic inverter 130; receive a load power signal representing the load power of the power supply area output by the load power detection unit 140; determine the periodic average power generation power and the real-time power generation power of the photovoltaic power generation component 110 within a preset period according to the power generation signal;

[0048] When the periodic average power generation is less than the preset average power generation, determine whether the real-time load power of the power supply area is less than the preset load power, and whether the real-time power generation is less than the preset real-time power generation; if the real-time load power of the power supply area is less than the preset load power, and the real-time power generation is less than the preset real-time power generation, determine whether the difference between the output power of the photovoltaic power generation component 110 and the preset load power is greater than the preset difference power; when the difference power between the output power of the photovoltaic power generation component 110 and the preset load power is greater than the preset difference power, control the cleaning component 120 to clean the photovoltaic power generation component 110 and reset the difference power.

[0049] Thus, through the above steps, the power generation data of the photovoltaic power generation component 110 and the load power data of the power supply area can be collected, and then based on the power generation power data, when the period average power generation is less than the preset average power generation and the real-time power generation is less than the preset real-time power generation, the cleaning component 120 is controlled to clean the photovoltaic power generation component 110, the purpose of which is to select the time period when the photovoltaic power generation component 110 is relatively low, so as to avoid the power generation of the photovoltaic power generation component 110 being significantly reduced during the working time period when the cleaning component 120 cleans the photovoltaic power generation component 110;

[0050] In addition, during the working period when the cleaning component 120 cleans the photovoltaic power generation component 110, the real-time load power of the power supply area is less than the preset load power, and the difference power between the output power of the photovoltaic power generation component 110 and the preset load power is greater than the preset difference power, that is, the load of the power supply area is small at this time, and then it can be selected to control the cleaning component 120 to clean the photovoltaic power generation component 110 when the load of the power supply area is reduced, thereby avoiding the aforementioned situation where the power generation power of the photovoltaic power generation component 110 is reduced and cannot meet the load of the power supply area;

[0051] In summary, the photovoltaic component self-cleaning method based on the balance of electricity supply and demand can clean the photovoltaic power generation component 110 at the appropriate time when the power system is operating, that is, comprehensively considering the power generation power of the photovoltaic power generation component 110 and the load power of the power supply area, and selecting the time period when the power generation power of the photovoltaic power generation component 110 is low and the load power of the power supply area is low to control the cleaning component 120 to clean the photovoltaic power generation component 110, thereby reducing the impact on the power generation of the photovoltaic power generation component 110 and the impact on the power consumption of the power consumption area, and maximizing the efficiency of the utilization of the photovoltaic power generation component 110, thereby improving the power generation efficiency of the photovoltaic power generation component 110, and then reducing the maintenance cost of the photovoltaic power generation component 110.

[0052] Furthermore, in this embodiment, the period average power generation is the average power generation of the photovoltaic power generation assembly 110 in one day. It should be noted that this embodiment is based on the statistical average power generation of the photovoltaic power generation assembly 110 in one day, and the calculation period of the period average power generation can be adaptively adjusted due to the environment of the power plant 10 and the season and climate.

[0053] In the above content, the step of determining whether the real-time load power of the power supply area is less than the preset load power includes:

[0054] Determine the active power, reactive power and apparent power of the real-time load in the power supply area according to the load power signal; and determine whether one or more of the active power, reactive power and apparent power is less than the preset load power.

[0055] The reason for such determination is that when identifying and confirming the load power in the power supply area, one of the parameters may fluctuate or an identification error may occur. Therefore, when confirming the load in the power supply area based on the load power signal, the corresponding parameters for comparison can be adjusted based on the actual operating conditions, that is, one or more of the active power, reactive power and apparent power are compared with the preset load power. It should be noted that when comparing multiple of the active power, reactive power and apparent power with the preset load power, specific parameters can be obtained based on their numerical values ​​and substituted into existing calculation formulas in the power system for comparison. In addition, when comparing one or more of the active power, reactive power and apparent power with the preset load power, if the actual selected power changes, the selection parameters of the preset load power need to be adaptively adjusted.

[0056] Furthermore, in the present embodiment, the preset average power generation power is less than or equal to 85%-90% of the rated power of the photovoltaic power generation component 110; that is, when the period average power generation power is taken as the daily average power generation power, when the daily average power generation power is less than or equal to 85%-90% of the rated power of the photovoltaic power generation component 110, it can be preliminarily determined that the photovoltaic power generation component 110 needs to be cleaned.

[0057] The preset load power is 40%-50% of the maximum load power of the power supply area, and the preset load power is less than the preset value of the maximum power of the user end 20. The preset value of the maximum power is determined based on the minimum load of the historical operation curve with seasonal differentiation of the user end 20, and is generally set to about 40% to 50%.

[0058] The setting value of the preset differential power is determined based on the difference between the historical load operation curve differentiated by the user side for 20 seasons and the photovoltaic or energy storage output characteristic curve. Taking into account the load volatility, it is set to 30%-40% of the maximum load power of the power supply area, and the preset differential power is 1.1 times greater than the power of the cleaning component 120.

[0059] Based on the above content, the photovoltaic assembly self-cleaning method based on power supply and demand balance is to monitor the average power generation power and real-time power generation power of the photovoltaic power generation panel 111 within a preset period through the inverter 130 and determine the real-time power generation power through the controller 150, monitor the load power of the user end 20 through the load power detection unit 140, and determine the real-time load power through the controller 150;

[0060] Thus, when the average power generation within the preset period is lower than the set power generation value, and the real-time load power is lower than the set load power value, and the real-time power generation is lower than the set power generation value, by calculating that the difference between the real-time power generation and the load power is higher than the set power difference, it is determined whether to send an action instruction to the cleaning component 120 through the controller 150 to clean the photovoltaic power generation component 110;

[0061] In the above content, the statistical time period of the average power generation used as the criterion is adjustable, and the time period of the average power generation can be set according to the geographical climate environment and seasonal changes of the power plant 10; for example, in areas with heavy sand and dust, the average power generation of the photovoltaic power generation assembly 110 within one week can be used as the judgment value; in an environment with little sand and dust and little climate change, the average power generation of the photovoltaic power generation assembly 110 within fifteen days can be used as the judgment value;

[0062] Moreover, the preset power is also adjustable, and can also be adjusted according to the geographical climate environment and seasonal changes of the power plant 10. For example, the preset power setting value can be larger in places with good sunlight, and the preset power in summer is larger than that in winter. In addition, when setting the preset power, the present embodiment adopts the percentage of the rated power of the photovoltaic power generation component 110 as the reference value. For example, the reference value in places with good sunlight and stable climate can be 90% or more of the rated power of the solar panel as the reference value. That is, the preset power can be set according to the geographical climate environment and seasonal changes of the power plant 10. In addition, the load power value, output and load power difference are also adjustable, and the reference value can be set independently according to the geographical climate environment and seasonal changes of the user end 20.

[0063] It should also be noted that when the controller 150 sends an action instruction to the cleaning component 120 to clean the photovoltaic power generation component 110, the cleaning component 120 starts to operate and automatically stops after completing the predetermined cleaning steps, and then circulates the next preset cycle.

[0064] Please refer to Figure 1 Based on the above-mentioned photovoltaic component self-cleaning method based on power supply and demand balance, this embodiment further provides a photovoltaic component self-cleaning system 100, which is used to implement the photovoltaic component self-cleaning method based on power supply and demand balance as in any one of the above-mentioned embodiments, and the photovoltaic component self-cleaning system 100 includes a photovoltaic power generation component 110, a load power detection unit 140, a cleaning component 120, a photovoltaic inverter 130, a control unit and a controller 150;

[0065] The photovoltaic power generation component 110 is arranged in the power plant 10, the load power detection unit 140 is used to detect the load power of the user end 20 in the power supply area, and the inverter 130 is used to detect the power generation power of the photovoltaic power generation component 110; the cleaning component 120 is arranged in the power plant 10 and is used to clean the photovoltaic power generation component 110; the photovoltaic power generation component 110, the load power detection unit 140, the inverter 130 and the cleaning component 120 are all electrically connected to the control unit; the control unit is used to execute a photovoltaic component self-cleaning method based on power supply and demand balance.

[0066] The inverter 130 is disposed in the power plant 10 and is used to detect the power generated by the photovoltaic power generation assembly 110 .

[0067] Specifically, in the power plant 10, when the photovoltaic power generation assembly 110 is affected by dust accumulation, which causes a change in its power generation efficiency, the photovoltaic power generation assembly 110 needs to be cleaned. The photovoltaic assembly self-cleaning system 100 can detect the power generation of the photovoltaic power generation assembly 110 in the power plant 10 by configuring the inverter 130; and the load power detection unit 140 can detect the load power of the user end 20 in the power supply area; thereby, relevant data of the power generation end and the power consumption end can be obtained;

[0068] On this basis, the control unit is used to execute a photovoltaic component self-cleaning method based on the balance of electricity supply and demand, so that the photovoltaic power generation component 110 can be cleaned at the appropriate time when the power system is running, that is, the power generation power of the photovoltaic power generation component 110 and the load power of the power supply area are comprehensively considered, and the cleaning component 120 is controlled to clean the photovoltaic power generation component 110 during the time period when the power generation power of the photovoltaic power generation component 110 is low and the load power of the power supply area is low, thereby reducing the impact on the power generation of the photovoltaic power generation component 110 and the power consumption of the power consumption area, and maximizing the efficiency of the utilization of the photovoltaic power generation component 110, thereby improving the power generation efficiency of the photovoltaic power generation component 110, and reducing the maintenance cost of the photovoltaic power generation component 110.

[0069] Furthermore, in this embodiment, when configuring the load power detection unit 140, the load power detection unit 140 includes multiple load power monitors, and the multiple load power monitors are distributed at the user end 20 of the power supply area, which are used to detect real-time active power, reactive power and apparent power. The purpose is to be able to objectively and accurately measure the load power in the user end 20, and transmit a load power signal representing the load power of the power supply area to the control unit.

[0070] When configuring the cleaning component 120, it can be adaptively set according to the structure of the photovoltaic power generation component 110. Specifically, when setting the photovoltaic power generation component 110, in order to increase the total power generation, the photovoltaic power generation component 110 includes a plurality of photovoltaic power generation panels 111, and the plurality of photovoltaic power generation panels 111 are arranged in an array in the power plant 10. The cleaning component 120 includes a plurality of cleaning units 121, and each cleaning unit 121 is used to clean at least one photovoltaic power generation panel 111 in a row or a column, so as to clean the photovoltaic power generation panel 111 in this way.

[0071] In addition, in the process of power generation, in order to facilitate the staff to observe the working state of the photovoltaic module self-cleaning system 100, the state of the photovoltaic power generation module 110, the load power detection unit 140 and the monitoring data of the inverter 130, the photovoltaic module self-cleaning system 100 also includes an external display 160, which is connected to the control unit and the controller 150, and transmits the relevant data to the external display 160 for display to the staff. The controller 150 has a control function, and can set the preset value of power generation, the preset value of load power, and the difference between power generation and load power.

[0072] When setting the controller 150, it can be seen from the above content that the cleaning component 120 is connected to the controller 150, and the controller 150 controls the cleaning component 120 to clean the photovoltaic power generation component 110. The function of the controller 150 is to receive the power generation power of the photovoltaic power generation component 110 through the inverter 130, receive the power signal output by the load power detection unit 140, and execute the photovoltaic component self-cleaning method based on the balance of power supply and demand.

[0073] In summary, the photovoltaic component self-cleaning method and photovoltaic component self-cleaning system 100 based on power supply and demand balance comprehensively consider the power generation power of the photovoltaic power generation component 110 and the load power of the power supply area, and choose to control the cleaning component 120 to clean the photovoltaic power generation component 110 during the time period when the power generation power of the photovoltaic power generation component 110 is low and the load power of the power supply area is low, that is, through the load power detection unit 140 and the inverter 130, it is evaluated when is the optimal time for the power system to operate, and then the automatic cleaning function is reasonably and efficiently realized, thereby reducing the impact on the power generation of the photovoltaic power generation component 110 and the power consumption of the power consumption area, and maximizing the efficiency. Improve the utilization rate of the photovoltaic power generation component 110, thereby improving the power generation efficiency of the photovoltaic power generation component 110, and then reducing the maintenance cost of the photovoltaic power generation component 110.

[0074] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A photovoltaic module self-cleaning method based on power supply and demand balance, characterized in that: include: Receive a power generation signal output by a photovoltaic inverter that represents the power generation power of a photovoltaic power generation component; receive a load power signal output by a load power detection unit that represents the load power of a power supply area; Determine the periodic average power generation and real-time power generation of the photovoltaic power generation component within a preset period according to the power generation signal; When the period average power generation is less than the preset average power generation, determining whether the real-time load power of the power supply area is less than the preset load power, and whether the real-time power generation is less than the preset real-time power generation; If the real-time load power of the power supply area is less than the preset load power, and the real-time power generation power is less than the preset real-time power generation power, it is determined whether the difference between the output power of the photovoltaic power generation component and the preset load power is greater than the preset difference power; When the difference power between the output power of the photovoltaic power generation component and the preset load power is greater than the preset difference power, the cleaning component is controlled to clean the photovoltaic power generation component and reset the difference power.

2. The photovoltaic module self-cleaning method based on power supply and demand balance according to claim 1, characterized in that: The period average power generation is the average power generation of the photovoltaic power generation assembly in one day.

3. The photovoltaic module self-cleaning method based on power supply and demand balance according to claim 1, characterized in that: The step of determining whether the real-time load power of the power supply area is less than the preset load power comprises: Determine the active power, reactive power and apparent power of the real-time load in the power supply area according to the load power signal; It is determined that one or more of the active power, the reactive power and the apparent power is less than the preset load power.

4. The photovoltaic module self-cleaning method based on power supply and demand balance according to claim 1, characterized in that: The preset average power generation power is less than or equal to 85%-90% of the rated power of the photovoltaic power generation assembly.

5. The photovoltaic module self-cleaning method based on power supply and demand balance according to claim 1, characterized in that: The preset load power is 40%-50% of the maximum load power of the power supply area.

6. The photovoltaic module self-cleaning method based on power supply and demand balance according to claim 1, characterized in that: The preset difference power is 30%-40% of the maximum load power of the power supply area.

7. The photovoltaic module self-cleaning method based on power supply and demand balance according to claim 6, characterized in that: The preset difference power is 1.1 times greater than the power of the cleaning component.

8. A photovoltaic module self-cleaning system, used to implement the photovoltaic module self-cleaning method based on power supply and demand balance as described in any one of claims 1 to 7, characterized in that: The photovoltaic component self-cleaning system includes a photovoltaic power generation component, a load power detection unit, a cleaning component, a photovoltaic inverter, a control unit and a controller; The photovoltaic power generation component is arranged in the power generation field, the load power detection unit is used to detect the load power of the user end of the power supply area, and the inverter is used to detect the power generation power of the photovoltaic power generation component; the cleaning component is arranged in the power generation field and is used to clean the photovoltaic power generation component; The photovoltaic power generation component, the load power detection unit, the inverter and the cleaning component are all electrically connected to the control unit; The control unit is used to execute the photovoltaic component self-cleaning method based on power supply and demand balance.

9. The photovoltaic module self-cleaning system according to claim 8, characterized in that: The load power detection unit includes multiple load power monitors, which are distributed at the user end of the power supply area and are used to detect real-time active power, reactive power and apparent power, and transmit load power signals representing the load power of the power supply area to the control unit.

10. The photovoltaic module self-cleaning system according to claim 8, characterized in that: The photovoltaic power generation component includes a plurality of photovoltaic power generation panels, and the plurality of photovoltaic power generation panels are arranged in an array in a power generation field; the cleaning component includes a plurality of cleaning units, and each of the cleaning units is used to clean at least one photovoltaic power generation panel in a row or a column.

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