Photovoltaic array cleaning evaluation method and cleaning device

Abstract

The present invention discloses a photovoltaic array cleaning evaluation method, which solves the problem of poor accuracy of existing photovoltaic array cleaning evaluation methods. The photovoltaic array cleaning evaluation method proposed by the present invention includes the following steps: obtaining a control power generation power P0 of a control photovoltaic panel in the same outdoor environment as the photovoltaic array, and calculating a control conversion coefficient CF0 of the control photovoltaic panel based on a preset control photovoltaic panel capacity Q0; obtaining the array power generation power P0 of the photovoltaic array; and calculating the control conversion coefficient CF0 of the control photovoltaic panel based on a preset control photovoltaic panel capacity Q0. i , and based on the preset photovoltaic array capacity Q i Calculate the array conversion factor CF of the photovoltaic array i ; According to CF0 and CF i Determining whether a photovoltaic array requires cleaning. The photovoltaic array cleaning assessment method of the present invention establishes a reference photovoltaic panel corresponding to the photovoltaic array, thereby accurately determining whether the photovoltaic array requires cleaning. The present invention also provides a cleaning device that utilizes the cleaning assessment method of the above technical solution and cleans the photovoltaic array when it requires cleaning.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic array cleaning, in particular to a photovoltaic array cleaning evaluation method and a cleaning device. Background Art

[0002] Photovoltaic arrays, consisting of multiple photovoltaic cells connected electrically and mechanically, are used to convert solar energy into electricity. PV arrays are typically installed on rooftops or in open areas. Accumulation of dirt, such as dust, leaves, and bird droppings, can reduce the array's efficiency.

[0003] In the prior art, cleaning robots are commonly used to clean photovoltaic arrays. To identify and determine whether a photovoltaic array requires cleaning, Chinese invention patent application publication number CN119406815A, entitled "Photovoltaic Panel Cleaner and Control Method Thereof," discloses a method for determining whether a photovoltaic array requires cleaning by establishing a miniature weather station.

[0004] In the aforementioned patent application, environmental data is monitored to calculate the standard power generation data of the photovoltaic panels under the current light intensity. This standard power generation value is then compared with the actual power generation data of the photovoltaic panels to determine whether the photovoltaic panels need to be cleaned. However, because the standard power generation value in this technical solution is a prediction based on the current environmental data, there is a significant error between it and the actual power generation status of the photovoltaic panels. As a result, the accuracy of the above patent application in determining whether the photovoltaic panels need to be cleaned is not very good. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention proposes a photovoltaic array cleaning evaluation method and a cleaning device, so as to solve the problem of poor accuracy of the prior photovoltaic array cleaning evaluation method.

[0006] In order to achieve the above technical objectives, the present invention proposes a photovoltaic array cleaning evaluation method, comprising the following steps:

[0007] Obtaining a control power generation power P0 of a control photovoltaic panel in the same outdoor environment as the photovoltaic array, and calculating a control conversion coefficient CF0 of the control photovoltaic panel based on a preset control photovoltaic panel capacity Q0;

[0008] Get the array power generation power P of the photovoltaic array i , and based on the preset photovoltaic array capacity Q i Calculate the array conversion factor CF of the photovoltaic array i ;

[0009] According to CF0 and CF i Determine whether the photovoltaic array needs cleaning.

[0010] The photovoltaic array cleaning evaluation method of the present invention obtains the comparison conversion coefficient CF0 of the comparison photovoltaic panel in the same outdoor environment as the photovoltaic array, and obtains the array conversion coefficient CF i , based on CF0 and CF i To judge whether the photovoltaic array is in normal working condition, since the control photovoltaic panel and the photovoltaic array are in the same outdoor environment, the conversion coefficients of the two should be very close. When there is a small difference between the two, it can be judged that the current power generation efficiency of the photovoltaic array is poor and needs to be cleaned, thereby greatly improving the precision and accuracy of the judgment, allowing the photovoltaic array to maintain good photoelectric conversion efficiency for a long time and improve its economic efficiency; at the same time, since the accumulated stains on the photovoltaic array can be discovered and cleaned relatively quickly, the photovoltaic array can be cleaned with a lower cleaning force, avoiding the photovoltaic array being subjected to greater pressure during the cleaning process and causing irreversible physical damage.

[0011] Preferably, CF0 and / or CF are calculated based on at least one of the following coefficient corrections: i :

[0012] Array attenuation coefficient ε i , is the attenuation of the photovoltaic array caused by use,

[0013] Array loss coefficient γ i , is the loss caused by connecting multiple photovoltaic cells in series and parallel in the photovoltaic array,

[0014] Inverter loss coefficient μ i , is the loss caused by the photovoltaic array inverter conversion;

[0015] P0 / Q0 is multiplied by at least one of the above coefficients to calculate CF0 in a corrected manner, and / or, P i / Q i Dividing by at least one of the above coefficients, the modified CF is obtained i .

[0016] Adopting the above technical solution, based on at least one coefficient for CF0 and / or CF i The correction is made, so that the difference caused by the different usage states of the photovoltaic panels and photovoltaic arrays can be reduced, thereby making the judgment on whether the photovoltaic array needs to be cleaned more accurate.

[0017] As a preference, the array attenuation coefficient ε is obtained by measuring and regularly correcting the photovoltaic array after cleaning. i .

[0018] By adopting the above technical solution, the array attenuation coefficient ε is regularly corrected. i The actual status of the photovoltaic conversion performance of the photovoltaic array can be obtained more accurately, thereby improving the accuracy of the judgment.

[0019] As a preference, CF0 and CF i The difference coefficient CV0 is calculated by subtraction, and the size of CV0 is compared with the preset cleaning judgment coefficient CV1 to determine whether the photovoltaic array needs to be cleaned.

[0020] Adopting the above technical solution, based on setting the preset cleaning judgment coefficient CV1, CV1 is combined with CF0 and CF i By comparing the difference between the two, it is convenient to judge the current photoelectric conversion status of the photovoltaic array.

[0021] As a preference, it also includes a preset cleaning judgment constant , Multiplying by P0 or P0 / Q0 gives CV1.

[0022] The above technical solution reduces the impact of environmental factors on the comparison between the two, thereby making the comparison between the two more accurate.

[0023] As a preference, CF0 and CF i The difference coefficient CV0 is calculated by division, and the size of CV0 is compared with the preset cleaning judgment coefficient CV1 to determine whether the photovoltaic array needs to be cleaned.

[0024] The above technical solution avoids the simple quantitative comparison between CV0 and CV1, reduces the influence of environmental factors on the comparison between the two, and thus makes the comparison between the two more accurate.

[0025] The present invention also proposes a cleaning device for a photovoltaic array, comprising tracks arranged on both sides of the photovoltaic array, a cleaning robot moving along the tracks, and a control module. The cleaning robot is provided with a reference photovoltaic panel and a power generation detection unit. The power generation detection unit obtains a reference power generation power P0 of the reference photovoltaic panel. The control module executes the cleaning evaluation method described in any of the aforementioned technical solutions, and controls the cleaning robot to clean the photovoltaic array when it is determined that the photovoltaic array needs to be cleaned.

[0026] The cleaning device of the present invention uses the photovoltaic panel used for charging on the cleaning robot as a reference photovoltaic panel, so that the photovoltaic panel can not only provide the cleaning robot with the electricity required for operation, but also serve as a reference photovoltaic panel of the photovoltaic array to provide reference data for cleaning judgment for the cleaning evaluation method, so that the photovoltaic panel plays the above-mentioned dual role; at the same time, the cleaning device does not need to be additionally equipped with a reference photovoltaic panel, thereby saving costs.

[0027] Preferably, the cleaning robot further comprises a brush assembly fixedly arranged relative to the track, and the brush assembly cleans the photovoltaic panel during operation of the cleaning robot.

[0028] By adopting the above-mentioned technical solution, the photovoltaic panels can be cleaned synchronously while the cleaning robot cleans the photovoltaic array, reducing or avoiding the accumulation of stains on the photovoltaic panels. On the one hand, the photovoltaic panels can be cleaned regularly, so that the photovoltaic panels can provide sufficient charging power for the cleaning robot, ensuring that the cleaning robot can complete charging more quickly after completing the cleaning program, reducing the probability that the cleaning robot cannot complete the cleaning work due to working in an undercharged state; on the other hand, keeping the photovoltaic panels clean is conducive to ensuring the accuracy of the control power generation power P0, thereby improving the accuracy of the cleaning evaluation method; secondly, each time the cleaning robot completes the cleaning of the photovoltaic array, it also completes the cleaning of its own photovoltaic panels. The cleaning device does not need to set up an additional cleaning mechanism to complete the cleaning operation of the photovoltaic panels, avoiding the increase in material costs and operating costs caused by the additional setting of a cleaning mechanism.

[0029] Preferably, a dust blowing fan is further included, which blows air toward the photovoltaic panel to remove stains accumulated on the photovoltaic panel.

[0030] By adopting the above-mentioned technical solution, the photovoltaic panels are blown by a dust blower, which reduces the probability of dust, leaves and other debris accumulating on the photovoltaic panels, thereby avoiding the accumulation of stains on the photovoltaic panels and causing a decrease in the control power generation power P0, and improving the accuracy of judging whether the photovoltaic array needs to be cleaned.

[0031] Preferably, the photovoltaic cells on the photovoltaic panel and the photovoltaic cells on the photovoltaic array are of the same model.

[0032] By adopting the above-mentioned technical solution, the difference between the photovoltaic cells on the photovoltaic panel and the photovoltaic cells on the photovoltaic array is relatively small, and the photoelectric conversion performance and usage attenuation rate of the two are relatively close. The photoelectric conversion coefficients of the two can calibrately reflect the difference in their working conditions, thereby improving the accuracy of judging whether the photovoltaic array needs to be cleaned.

[0033] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of a parking bracket according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of a cleaning robot located at a parking position of a parking bracket in an embodiment of the present invention.

[0036] Reference numerals:

[0037] 100. Cleaning robot, 110. Photovoltaic panels;

[0038] 200. Parking bracket, 210. Parking position, 220. Brush assembly. DETAILED DESCRIPTION

[0039] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" or "several" means two or more, unless otherwise explicitly specified.

[0042] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] The photovoltaic array cleaning evaluation method proposed in the embodiment of the present invention includes the following steps:

[0044] Obtaining a control power generation power P0 of a control photovoltaic panel in the same environment as the photovoltaic array, and calculating a control conversion coefficient CF0 of the control photovoltaic panel based on a preset control photovoltaic panel capacity Q0;

[0045] Get the array power generation power P of the photovoltaic array i , and based on the preset photovoltaic array capacity Q i Calculate the array conversion factor CF of the photovoltaic array i ;

[0046] According to CF0 and CF i Determine whether the photovoltaic array needs cleaning.

[0047] When the cleaning evaluation method determines that the photovoltaic array needs to be cleaned, a cleaning device may be started to clean the photovoltaic array.

[0048] It should be noted that, in the above steps, the steps of obtaining P0 and calculating CF0 are not necessarily the first step. i and calculate CF i The step of obtaining P0 is not necessarily the second step. i The steps can be performed in parallel; you can also obtain P0 first, and then obtain P i , or you can first get P i , and then obtain P0. Accordingly, the steps for calculating CF0 are the same as those for calculating CF i The steps can be performed in parallel; you can also calculate CF0 first, and then calculate CF i ; You can also calculate CF first i , and then calculate CF0.

[0049] A photovoltaic array is composed of several photovoltaic cells or photovoltaic modules connected in series and / or in parallel. The reference photovoltaic panel is usually a photovoltaic cell or a photovoltaic module. The reference photovoltaic panel capacity Q0 refers to the maximum output power of the reference photovoltaic panel under standard test conditions. The photovoltaic array capacity Q i Refers to the maximum output power of a photovoltaic array under standard test conditions.

[0050] Since the control photovoltaic panel and the photovoltaic array are in the same outdoor environment, the conversion coefficients of the control photovoltaic panel and the photovoltaic array should be very close. i When there is a small deviation between the two, it can be determined that there is dirt blocking the photovoltaic array, which leads to a decrease in the photoelectric conversion efficiency of the photovoltaic array, so the photovoltaic array is cleaned to restore the photoelectric conversion efficiency of the photovoltaic array.

[0051] The photovoltaic array cleaning evaluation method of the present invention obtains the comparison conversion coefficient CF0 of the comparison photovoltaic panel in the same outdoor environment as the photovoltaic array, and obtains the array conversion coefficient CF i , based on CF0 and CF iTo judge whether the photovoltaic array is in normal working condition, since the control photovoltaic panel and the photovoltaic array are in the same outdoor environment, the conversion coefficients of the two should be very close. When there is a small difference between the two, it can be judged that the current photoelectric conversion efficiency of the photovoltaic array is poor and needs to be cleaned, thereby greatly improving the precision and accuracy of the judgment, allowing the photovoltaic array to maintain good photoelectric conversion efficiency for a long time and improve its economic efficiency; at the same time, since the accumulated stains on the photovoltaic array can be discovered and cleaned relatively quickly, the photovoltaic array can be cleaned with a lower cleaning force, avoiding the photovoltaic array being subjected to greater pressure during the cleaning process and causing irreversible physical damage.

[0052] In one embodiment, the cleaning evaluation method further comprises the following steps:

[0053] While or after the PV array cleaning is in progress, clean the control PV panel.

[0054] In this way, the control photovoltaic panel can be kept clean, reducing or avoiding the inaccurate judgment caused by the decrease of the control power generation power P0 due to the presence of stains on the control photovoltaic panel.

[0055] In one embodiment, CF0 and / or CF are calculated based on a coefficient correction of at least one of the following: i .

[0056] Parameters include:

[0057] Array attenuation coefficient ε i , is the attenuation of the photovoltaic array caused by use,

[0058] Array loss coefficient γ i , is the loss caused by connecting multiple photovoltaic cells in series and parallel in the photovoltaic array,

[0059] Inverter loss coefficient μ i , is the loss caused by the inverter conversion of the photovoltaic array.

[0060] Among them, the array attenuation coefficient ε i , which is generated with the use of the photovoltaic array, can be corrected by regular measurement of the photovoltaic array, or can be calculated based on the annual attenuation rate of the photovoltaic panel according to the service life of the photovoltaic array.

[0061] Among them, the array loss coefficient γ i , which can be regarded as a constant and can be calculated based on the number and connection method of photovoltaic cells in the photovoltaic array or measured by instruments.

[0062] Among them, the inverter loss coefficient μ i , which can be regarded as a constant and can be directly measured or calculated by measuring the input and output ends of the photovoltaic array inverter through instruments.

[0063] In this embodiment, P0 / Q0 is multiplied by at least one of the above coefficients to calculate CF0 in a corrected manner.

[0064] In some other embodiments, P i / Q i CF is calculated by dividing at least one of the above coefficients i .

[0065] In some other embodiments, P0 / Q0 is multiplied by at least one of the above coefficients to calculate CF0 in a modified manner, and P i / Q i CF is calculated by dividing at least one of the above coefficients i .

[0066] Based on at least one coefficient for CF0 and / or CF i The correction is made, so that the difference caused by the different usage states of the photovoltaic panels and photovoltaic arrays can be reduced, thereby making the judgment on whether the photovoltaic array needs to be cleaned more accurate.

[0067] In one embodiment, the array attenuation coefficient ε is obtained by periodically measuring and correcting the photovoltaic array after cleaning. i .

[0068] During the regular inspection of the photovoltaic array by the inspectors, the inspectors measure the photovoltaic array with the IV curve tester under the condition of appropriate irradiance, so as to obtain the array attenuation coefficient ε i Before measurement, the inspection personnel need to clean the photovoltaic array to ensure the accuracy of the measurement. The photovoltaic array can also be cleaned by executing a cleaning procedure through the photovoltaic array cleaning device.

[0069] By periodically correcting the array attenuation coefficient ε i The actual status of the photovoltaic conversion performance of the photovoltaic array can be obtained more accurately, thereby improving the accuracy of the judgment.

[0070] In one embodiment, CF0 or CF is calculated based on the correction of the control attenuation coefficient ε0. i , where the control attenuation coefficient ε0 is the attenuation of the control photovoltaic panel caused by use.

[0071] The control attenuation coefficient ε0 can be obtained by regular measurement and correction of the cleaned control photovoltaic panels by inspection personnel using instruments, or it can be calculated based on the annual attenuation rate of the control photovoltaic panels according to the service life of the control photovoltaic panels.

[0072] In this embodiment, CF0 is calculated by multiplying P0 / Q0 by the control attenuation coefficient ε0.

[0073] In some other embodiments, it may also be P i / Q i CF is calculated by dividing the control attenuation coefficient ε0 i .

[0074] By regularly correcting the control attenuation coefficient ε0, the actual status of the photoelectric conversion performance of the control photovoltaic panel can be obtained more accurately, thereby improving the accuracy of the judgment.

[0075] In one embodiment, CF0 and CF i The difference coefficient CV0 is calculated by subtraction, and the size of CV0 is compared with the preset cleaning judgment coefficient CV1 to determine whether the photovoltaic array needs to be cleaned.

[0076] When CV0 is greater than CV1, it is considered that the current photoelectric conversion efficiency of the photovoltaic array is poor, and it is determined that the photovoltaic array needs to be cleaned.

[0077] By setting the cleaning judgment coefficient CV1, CV1 is combined with CF0 and CF i By comparing the difference between the two, it is convenient to judge the current photoelectric conversion status of the photovoltaic array.

[0078] This embodiment preferably also includes a preset cleaning judgment constant , Multiplying by P0 or P0 / Q0 gives CV1.

[0079] CV1 is calculated based on the control power generation power P0 of the control photovoltaic panel, or based on the ratio of the control power generation power P0 to the control photovoltaic panel capacity Q0. When there is sufficient sunlight, the control power generation power P0 increases, and CV1 increases accordingly. When there is insufficient sunlight, the control power generation power P0 decreases, and CV1 decreases accordingly. Multiplying CV1 by P0 or P0 / Q0 converts the comparison between CV0 and CV1 from a simple quantitative comparison to a percentage comparison, reducing the impact of environmental factors on the comparison between the two, making the comparison between the two more accurate.

[0080] In another embodiment, CFO and CF i The difference coefficient CV0 is calculated by division, and the size of CV0 is compared with the preset cleaning judgment coefficient CV1 to determine whether the photovoltaic array needs to be cleaned.

[0081] This setting also avoids the simple quantitative comparison between CV0 and CV1, reduces the impact of environmental factors on the comparison between the two, and thus makes the comparison between the two more accurate.

[0082] The present invention also provides a photovoltaic array cleaning device, such as Figure 1 、 Figure 2As shown, it includes tracks arranged on both sides of the photovoltaic array, a cleaning robot 100 moving along the tracks, and a control module. The cleaning robot 100 is provided with a photovoltaic panel 110 for charging and a power generation detection unit. The photovoltaic panel 110 serves as the reference photovoltaic panel in the aforementioned embodiment. The power generation detection unit obtains the reference power generation P0 of the photovoltaic panel 110. The control module executes the cleaning evaluation method as in any of the aforementioned embodiments, and controls the cleaning robot 100 to clean the photovoltaic array when it is determined that the photovoltaic array needs to be cleaned.

[0083] The cleaning robot 100 is provided with a battery that provides the power required for the movement of the cleaning robot 100. The photovoltaic panel 110 can not only charge the battery, but also serve as a reference panel for comparing the photoelectric conversion efficiency with the photovoltaic array and serving as the basis for the cleaning evaluation method.

[0084] The cleaning device of the present invention uses the photovoltaic panel 110 used for charging on the cleaning robot 100 as a reference photovoltaic panel, so that the photovoltaic panel 110 can not only charge the battery to provide the cleaning robot with the electricity required for operation, but also serve as a reference photovoltaic panel to provide reference data for cleaning judgment for the cleaning evaluation method, so that the photovoltaic panel 110 plays the above-mentioned dual role; at the same time, the cleaning device does not need to be additionally equipped with a reference photovoltaic panel, thereby saving costs.

[0085] In one embodiment, Figure 2 As shown, the cleaning device further includes a brush assembly 220 fixedly arranged relative to the track. The brush assembly 220 cleans the photovoltaic panel 110 during the cleaning process of the cleaning robot 100 cleaning the photovoltaic array.

[0086] In this embodiment, the brush assembly 220 is configured in a strip shape, and the extension direction of the strip brush assembly 220 is perpendicular to the running direction of the cleaning robot 100. During the cleaning process of the cleaning robot 100, the brush assembly 220 brushes the photovoltaic panel 110 on the cleaning robot 100, thereby cleaning the photovoltaic panel 110.

[0087] In some other embodiments, the brush assembly 220 may also have a certain angle with the running direction of the cleaning robot 100, so that the brush assembly 220 can brush the photovoltaic panel 110 on the cleaning robot 100 during the cleaning process of the cleaning robot 100.

[0088] With such an arrangement, the photovoltaic panels 110 can be cleaned synchronously while the cleaning robot 100 cleans the photovoltaic array, reducing or avoiding the accumulation of stains on the photovoltaic panels 110. On the one hand, the photovoltaic panels 110 can be cleaned regularly, so that the photovoltaic panels 110 can provide sufficient charging power for the cleaning robot 100, ensuring that the cleaning robot 100 can complete charging more quickly after completing the cleaning program, reducing the probability that the cleaning robot 100 cannot complete the cleaning work due to working in a fully charged state; on the other hand, keeping the photovoltaic panels 110 clean is conducive to ensuring the accuracy of the control power generation power P0, thereby improving the accuracy of the cleaning evaluation method; secondly, each time the cleaning robot 100 completes the cleaning of the photovoltaic array, it also completes the cleaning of the photovoltaic panels 110 on itself, and the cleaning device does not need to set up an additional cleaning mechanism to complete the cleaning operation of the photovoltaic panels 110, avoiding the increase in material costs and operating costs caused by the additional setting of a cleaning mechanism.

[0089] This embodiment is preferred, as Figure 1 、 Figure 2 As shown, the cleaning device is provided with a parking bracket 200, which is located outside the photovoltaic array. A parking position 210 is provided on the parking bracket 200, and a brush assembly 220 is fixedly provided on the parking bracket 200. The cleaning robot 100 returns to the parking position 210 after completing the cleaning procedure. The brush assembly 220 is provided on the side of the parking bracket 200 close to the photovoltaic array. The brush assembly 220 cleans the photovoltaic panel 110 during the process of the cleaning robot 100 entering and leaving the parking position 210.

[0090] With such an arrangement, the cleaning robot 100 stops at the parking position 210 after completing the cleaning of the photovoltaic array, thereby preventing the cleaning robot 100 from affecting the lighting of the photovoltaic array. At the same time, the brush assembly 220 is arranged on the parking bracket 200, so that the brush assembly 220 can be reliably fixed, avoiding the need to additionally set up a fixing structure for the brush assembly 220.

[0091] In one embodiment, a dust blowing fan is further included, and the dust blowing fan blows air toward the photovoltaic panel 110 .

[0092] The dust blower is powered by the battery of the cleaning robot 100 and is controlled by the control module to blow air regularly.

[0093] By blowing air to the photovoltaic panel 110 with a dust blower, the probability of dust, leaves and other debris accumulating on the photovoltaic panel 110 is reduced, thereby avoiding the accumulation of stains on the photovoltaic panel 110 and causing a decrease in the control power generation power P0, and improving the accuracy of judging whether the photovoltaic array needs to be cleaned.

[0094] In one embodiment, the photovoltaic cells on the photovoltaic panel 110 are of the same model as the photovoltaic cells on the photovoltaic array.

[0095] Such an arrangement makes the difference between the photovoltaic cells on the photovoltaic panel 110 and the photovoltaic cells on the photovoltaic array smaller, and the photoelectric conversion performance and usage attenuation rate of the two are relatively close. The photoelectric conversion coefficients of the two can calibrately reflect the difference in their working conditions, thereby improving the accuracy of the judgment on whether the photovoltaic array needs to be cleaned.

[0096] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A method for evaluating the cleaning of a photovoltaic array, characterized in that: The following steps are involved: Obtaining a control power generation P0 of a control photovoltaic panel in the same outdoor environment as the photovoltaic array, and calculating a control conversion coefficient CF0 of the control photovoltaic panel based on a preset control photovoltaic panel capacity Q0; Get the array power generation power P of the photovoltaic array i , and based on the preset photovoltaic array capacity Q i Calculate the array conversion factor CF of the photovoltaic array i ; According to CF0 and CF i Determine whether the photovoltaic array needs cleaning; The cleaning evaluation method is applied to a cleaning device for a photovoltaic array, the cleaning device comprising tracks arranged on both sides of the photovoltaic array, a cleaning robot moving along the tracks, a parking bracket and a control module, the cleaning robot being provided with a photovoltaic panel for charging and a power generation detection unit, the photovoltaic panel being a control photovoltaic panel, the power generation detection unit obtaining a control power generation P0 of the control photovoltaic panel, the control module executing the cleaning evaluation method and controlling the cleaning robot to clean the photovoltaic array when it is judged that the photovoltaic array needs to be cleaned, the parking bracket being located outside the photovoltaic array, the parking bracket being provided with a parking position, the cleaning robot returning to the parking position after completing the cleaning procedure, the parking bracket being fixed with a brush assembly on the side close to the photovoltaic array, the brush assembly cleaning the photovoltaic panel when the cleaning robot enters and leaves the parking position.

2. The cleaning evaluation method according to claim 1, wherein: The cleaning device further comprises a dust blowing fan, which blows air toward the photovoltaic panel to remove dust or leaves accumulated on the photovoltaic panel.

3. The cleaning evaluation method according to claim 1, wherein: The photovoltaic cells on the photovoltaic panel and the photovoltaic cells on the photovoltaic array are of the same model.

4. The cleaning evaluation method according to claim 1, wherein: CF0 and / or CF are calculated based on the coefficient correction of at least one of the following i : Array attenuation coefficient ε i , is the attenuation of the photovoltaic array caused by use, Array loss coefficient γ i , is the loss caused by connecting multiple photovoltaic cells in series and parallel in the photovoltaic array, Inverter loss coefficient μ i , is the loss caused by the photovoltaic array inverter conversion; P0 / Q0 is multiplied by at least one of the above coefficients to calculate CF0 in a corrected manner, and / or, P i / Q i CF is calculated by dividing at least one of the above coefficients i .

5. The cleaning evaluation method according to claim 4, wherein: The array attenuation coefficient ε is obtained by measuring the cleaned photovoltaic array and regularly correcting it. i .

6. The cleaning evaluation method according to claim 1, wherein: Set CF0 and CF i The difference coefficient CV0 is calculated by subtraction, and the size of CV0 is compared with the preset cleaning judgment coefficient CV1 to determine whether the photovoltaic array needs to be cleaned.

7. The cleaning evaluation method according to claim 6, wherein: Also includes preset cleaning judgment constants , Multiplying by P0 or P0 / Q0 gives CV1.

8. The cleaning evaluation method according to claim 1, wherein: CF0 and CF i The difference coefficient CV0 is calculated by division, and the size of CV0 is compared with the preset cleaning judgment coefficient CV1 to determine whether the photovoltaic array needs to be cleaned.

Images