A method and device for calculating power generation loss of a photovoltaic module, and an electronic device

Abstract

The application provides a photovoltaic module power generation loss calculation method and device and electronic equipment. Fault information of a photovoltaic module is obtained, and an area ratio corresponding to the fault information and a power generation loss influence coefficient are calculated. A difference between actual power generation and theoretical power generation of a photovoltaic module string to which the photovoltaic module belongs is calculated and taken as a power generation loss value of the photovoltaic module string. A module power generation loss value corresponding to the fault information is calculated according to the power generation loss value of the photovoltaic module string, the area ratio corresponding to the fault information and the power generation loss influence coefficient. A total power generation loss value of the photovoltaic module is calculated based on the module power generation loss value. Through the application, the power generation loss of the photovoltaic module caused by the fault can be calculated, and the problem that the power generation loss of the photovoltaic module caused by the fault needs to be determined to provide a reference for operation and maintenance when the photovoltaic module fails is solved.

Description

Technical Field

[0001] This invention relates to the field of operation and maintenance of faulty photovoltaic modules, and more specifically, to a method, apparatus and electronic equipment for calculating the power generation loss of photovoltaic modules. Background Technology

[0002] With the further development of the photovoltaic industry, the market size of the photovoltaic industry will show a year-on-year growth trend. As the scale of grid-connected photovoltaic power plants becomes larger and larger, the subsequent operation and maintenance business will become the fastest growing business in the power plant sector in the future.

[0003] During the operation of a solar photovoltaic power station, damage to the solar cells, the development of cracks into breakage, and the deterioration of cell characteristics can occur. Over long-term use, obstructions such as birds, dust, and fallen leaves inevitably accumulate on the photovoltaic modules, creating hot spot effects that can easily lead to module failure.

[0004] When a photovoltaic module fails, determining the power generation loss caused by the failure, in order to provide a reference for operation and maintenance, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a method, apparatus and electronic device for calculating the power generation loss of photovoltaic modules, so as to solve the problem that when photovoltaic modules fail, it is necessary to determine the power generation loss of photovoltaic modules caused by the failure in order to provide a reference for operation and maintenance work.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A method for calculating the power generation loss of a photovoltaic module includes:

[0008] Obtain fault information of photovoltaic modules and calculate the area ratio and power generation loss impact coefficient corresponding to the fault information;

[0009] Calculate the difference between the actual power generation and the theoretical power generation of the photovoltaic string containing the photovoltaic module, and use it as the power generation loss value of the photovoltaic string;

[0010] Based on the power generation loss value of the photovoltaic string, the area ratio corresponding to the fault information, and the power generation loss impact coefficient, calculate the power generation loss value of the module corresponding to the fault information;

[0011] Based on the power generation loss value of the component, calculate the total power generation loss value of the photovoltaic module.

[0012] Optionally, the fault information includes the fault type and the faulty battery cell information corresponding to the fault type; the faulty battery cell information includes the number and location of the faulty battery cells;

[0013] Calculating the area percentage corresponding to the fault information includes:

[0014] Obtain the structural information of the photovoltaic module;

[0015] Based on the structural information of the photovoltaic module, the fault type, and the faulty cell information, calculate the percentage of the module area of ​​the faulty cell corresponding to the fault type in the photovoltaic module.

[0016] Based on the component area ratio, the string area ratio corresponding to the fault type is determined.

[0017] Optionally, based on the component area ratio, determining the string area ratio corresponding to the fault type includes:

[0018] Obtain the structural information of the photovoltaic string containing the photovoltaic module;

[0019] Based on the component area ratio and the structural information of the photovoltaic string, calculate the sub-area ratio of the faulty cell corresponding to the fault type in the photovoltaic module in the photovoltaic string.

[0020] Obtain the sum of the sub-area percentages corresponding to all the fault types in the photovoltaic string;

[0021] The ratio of the sub-area percentage to the sum of the sub-area percentages is taken as the string area percentage corresponding to the fault type.

[0022] Optionally, the calculation of the power generation loss impact coefficient corresponding to the fault information includes:

[0023] Obtain the temperature information of each pixel in the image of all faulty cells corresponding to the fault type in the photovoltaic string;

[0024] Calculate the average temperature information of each pixel and use it as the average temperature information corresponding to the fault type;

[0025] Obtain the sum of the average temperature information corresponding to all fault types in the photovoltaic string;

[0026] The ratio of the average temperature information corresponding to the fault type to the sum of the average temperature information is used as the power generation loss impact coefficient corresponding to the fault type.

[0027] Optionally, based on the power generation loss value of the photovoltaic string, the area proportion corresponding to the fault information, and the power generation loss impact coefficient, the module power generation loss value corresponding to the fault information is calculated, including:

[0028] Calculate the product of the power generation loss value of the photovoltaic string and the power generation loss influence coefficient, and use it as the power generation quantum loss value when the fault type causes the photovoltaic string to generate power generation loss;

[0029] The product of the power generation quantum loss value and the string area ratio is used as the power generation loss value of the photovoltaic module when the fault type causes the photovoltaic module to generate power loss.

[0030] Optionally, based on the power generation loss value of the component, the total power generation loss value of the photovoltaic module is calculated, including:

[0031] The sum of the power generation loss values ​​of all the photovoltaic modules corresponding to the photovoltaic module is taken as the total power generation loss value of the photovoltaic module.

[0032] Optionally, after calculating the total power generation loss of the photovoltaic module, the method further includes:

[0033] If the total power generation loss of the photovoltaic module exceeds a preset loss threshold, a prompt to replace the photovoltaic module will be output.

[0034] Optionally, if the total power generation loss of the photovoltaic module is not greater than a preset loss threshold, the method further includes:

[0035] Calculate the power generation gain after performing preset operations on the photovoltaic module, as well as the preset operation cost; the preset operations include replacement or repair.

[0036] If the power generation gain is greater than the preset operating cost, output a prompt message to perform the preset operation.

[0037] A device for calculating the power generation loss of a photovoltaic module, comprising:

[0038] The data calculation module is used to acquire fault information of photovoltaic modules and calculate the area ratio and power generation loss impact coefficient corresponding to the fault information.

[0039] The first loss value calculation module is used to calculate the difference between the actual power generation and the theoretical power generation of the photovoltaic string in which the photovoltaic module is located, and use it as the power generation loss value of the photovoltaic string.

[0040] The second loss value calculation module is used to calculate the component power generation loss value corresponding to the fault information based on the power generation loss value of the photovoltaic string, the area ratio corresponding to the fault information, and the power generation loss impact coefficient.

[0041] The third loss value calculation module is used to calculate the total power generation loss value of the photovoltaic module based on the power generation loss value of the module.

[0042] An electronic device includes: a memory and a processor;

[0043] The memory is used to store programs;

[0044] The processor calls the program and executes the above-described method for calculating the power generation loss of a photovoltaic module.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] This invention provides a method, apparatus, and electronic device for calculating the power generation loss of photovoltaic (PV) modules. The method involves acquiring fault information of the PV module, calculating the area proportion and power generation loss impact coefficient corresponding to the fault information, calculating the difference between the actual and theoretical power generation of the PV string containing the PV module, and using this difference as the power generation loss value of the PV string. Based on the power generation loss value of the PV string, the area proportion and power generation loss impact coefficient corresponding to the fault information, the method calculates the module power generation loss value corresponding to the fault information. Finally, based on the module power generation loss value, the method calculates the total power generation loss value of the PV module. This invention enables the calculation of the power generation loss of PV modules due to faults, solving the problem of urgently needing to determine the power generation loss of PV modules due to faults to provide a reference for operation and maintenance work. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0048] Figure 1 A flowchart illustrating a method for calculating power generation loss in a photovoltaic module, provided in an embodiment of the present invention;

[0049] Figure 2 A flowchart illustrating a method for calculating area percentage provided in an embodiment of the present invention;

[0050] Figure 3 A flowchart illustrating a method for calculating the impact coefficient of power generation loss, provided in an embodiment of the present invention;

[0051] Figure 4This is a schematic diagram of a photovoltaic module power generation loss calculation device provided in an embodiment of the present invention. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] With increasing investment in the development and research of clean and renewable energy worldwide, the photovoltaic industry based on solar energy is developing rapidly. Currently, my country's photovoltaic industry continues to expand in scale, and the overall development trend of the industry is positive.

[0054] With the further development of the photovoltaic industry, the market size of the photovoltaic industry will show a year-on-year growth trend. As the scale of grid-connected photovoltaic power plants becomes larger and larger, the subsequent operation and maintenance business will become the fastest growing business in the power plant sector in the future.

[0055] During the operation of a solar photovoltaic power station, damage to the solar cells, the development of cracks into breakage, and the deterioration of cell characteristics can occur. Over long-term use, obstructions such as birds, dust, and fallen leaves inevitably accumulate on the photovoltaic modules, creating hot spot effects that can easily lead to module failure.

[0056] Domestic photovoltaic power plants are generally built on large hillsides, deserts, plains, swamps, bodies of water, factory rooftops, and residential rooftops. The scale, form, and distribution of different photovoltaic power plants vary significantly, leading to many inconveniences in later operation and maintenance inspections. In particular, the larger the scale of a photovoltaic power generation project, the more complex the power plant inspection work becomes. When inspecting this type of power plant project, conventional manual inspection methods not only consume a large amount of manpower and time, resulting in untimely equipment inspections and affecting the power plant's economic benefits, but also pose certain dangers to the inspection personnel.

[0057] Currently, in power plant operation and maintenance, infrared images of photovoltaic modules are mainly collected by infrared cameras carried by drones. Based on image analysis, detection methods are used to determine whether the modules have faults and what kind of faults they have.

[0058] While drone inspections of power plants can pinpoint the specific faulty components, they cannot provide a quantitative estimate of the power generation loss caused by the faults. This only offers limited reference information for developing maintenance strategies, leaving maintenance personnel unsure how to make accurate maintenance decisions. They often need to manually inspect the severity of the faults on-site, which increases their workload.

[0059] Therefore, determining the power generation loss caused by photovoltaic modules when they fail is a technical problem that urgently needs to be solved by those skilled in the art, so as to provide a more accurate reference for operation and maintenance decisions and to guide operation and maintenance work more efficiently.

[0060] To address this issue, the present invention provides a method, apparatus, and electronic device for calculating the power generation loss of photovoltaic (PV) modules. The method involves acquiring fault information of the PV module, calculating the area proportion and power generation loss impact coefficient corresponding to the fault information, calculating the difference between the actual and theoretical power generation of the PV string containing the PV module, and using this difference as the power generation loss value of the PV string. Based on the power generation loss value of the PV string, the area proportion and power generation loss impact coefficient corresponding to the fault information, the method calculates the module power generation loss value corresponding to the fault information. Finally, based on the module power generation loss value, the method calculates the total power generation loss value of the PV module. This invention enables the calculation of the power generation loss of PV modules due to faults, solving the problem of urgently needing to determine the power generation loss of PV modules due to faults to provide a reference for operation and maintenance work.

[0061] Based on the above, embodiments of the present invention provide a method for calculating the power generation loss of photovoltaic modules, referring to... Figure 1 It can include:

[0062] S11. Obtain fault information of photovoltaic modules and calculate the area ratio and power generation loss impact coefficient corresponding to the fault information.

[0063] In this embodiment, infrared images of photovoltaic modules can be acquired by an infrared camera device carried by a drone. Based on image analysis, a detection method can be used to determine whether the module has a fault and what kind of fault it has. For example, an AI model can be used to identify faulty modules and fault types.

[0064] In this embodiment, the fault information of the photovoltaic module may include:

[0065] The fault type and the corresponding faulty solar cell information; the faulty solar cell information includes the number and location of the faulty solar cells, specifically referring to which photovoltaic module the faulty solar cells are located on and their exact position on the photovoltaic module.

[0066] In practical applications, a photovoltaic string may contain multiple faulty photovoltaic modules, and a single photovoltaic module may also contain multiple faults. Therefore, when estimating the power generation loss of faulty modules, we need to calculate separately for each specific fault type.

[0067] After obtaining the fault information of the photovoltaic modules, it is necessary to calculate the area percentage corresponding to the fault information. This area percentage includes both the module area percentage and the string area percentage.

[0068] The component area percentage refers to the percentage of the area of ​​the faulty solar cell corresponding to the fault type in the photovoltaic module.

[0069] The string area ratio refers to the proportion of the faulty cell corresponding to the fault type in the photovoltaic module within the total fault area corresponding to the fault type in the photovoltaic string where the photovoltaic module is located.

[0070] Specifically, refer to Figure 2 Calculating the area percentage corresponding to the fault information may include:

[0071] S21. Obtain the structural information of the photovoltaic module.

[0072] For example, in practical applications, photovoltaic cells are usually connected in series to form a group, and then connected in parallel to form a photovoltaic module. Based on the process design of photovoltaic modules, photovoltaic cells in the same series affect each other's power generation, while photovoltaic cells connected in parallel do not affect each other.

[0073] Therefore, when determining the power generation loss of photovoltaic modules, it is necessary to obtain the structural information of the photovoltaic modules to understand how many photovoltaic cells are connected in series and how many are connected in parallel, so as to determine how many photovoltaic cells will be affected by failure and thus power generation.

[0074] S22. Based on the structural information of the photovoltaic module, the fault type, and the faulty cell information, calculate the percentage of the module area of ​​the faulty cell corresponding to the fault type in the photovoltaic module.

[0075] Specifically, based on the structural information of the photovoltaic module, the fault type, and the faulty cell information, the fault coverage ratio is calculated, that is, the percentage of module area covered by each fault type is statistically analyzed. ij Where i represents the fault type and j represents the photovoltaic module.

[0076] For example, a photovoltaic module consists of 10*6 (60) photovoltaic cells connected in series and parallel, meaning 10 cells are connected in series and then 6 groups are connected in parallel. If a fault spans 3 groups of parallel cells, then the area covered by the fault is 3 / 6. If another fault affects 5 cells, but all 5 cells are in the same parallel cell group, then the area covered by the fault is 1 / 6.

[0077] S23. Based on the component area ratio, determine the string area ratio corresponding to the fault type.

[0078] Specifically, step S23 may include:

[0079] 1) Obtain the structural information of the photovoltaic string in which the photovoltaic module is located.

[0080] For example, generally speaking, a photovoltaic string is composed of photovoltaic modules connected in series. If it is composed of 22 photovoltaic modules connected in series, then the structural information of the photovoltaic string containing the photovoltaic modules is the series connection method of the photovoltaic modules.

[0081] 2) Based on the component area ratio and the structural information of the photovoltaic string, calculate the sub-area ratio of the faulty cell corresponding to the fault type in the photovoltaic module in the photovoltaic string.

[0082] For example, fault type 1 exists in two photovoltaic modules (PV module 1 and PV module 2) in a photovoltaic string. The area ratio of fault type 1 on PV module 1 is 0.3. If the photovoltaic string consists of 20 photovoltaic modules connected in series, then the proportion of the photovoltaic module corresponding to the faulty cell with fault type 1 in the photovoltaic string is 1 / 20, and the sub-area ratio is 0.3 * 1 / 20 = 0.015.

[0083] The area ratio of photovoltaic module 2 is 0.2, and the sub-area ratio is 0.2*1 / 20=0.01.

[0084] 3) Obtain the sum of the sub-area percentages corresponding to all the fault types in the photovoltaic string.

[0085] If only photovoltaic modules 1 and 2 in the photovoltaic string have the fault corresponding to fault type 1, then the sum of the sub-area proportions corresponding to all the fault types in the photovoltaic string, S i =0.015+0.01=0.025, where i represents the fault type.

[0086] 4) The ratio of the sub-area percentage to the sum of the sub-area percentages is taken as the string area percentage corresponding to the fault type.

[0087] Specifically, the area ratio P of the string is...ij =0.015 / 0.025.

[0088] After calculating the area proportion corresponding to the fault information, it is also necessary to calculate the power generation loss impact coefficient corresponding to the fault information. Specifically, refer to... Figure 3 Calculating the power generation loss impact coefficient corresponding to the fault information may include:

[0089] S31. Obtain the temperature information of each pixel in the image of all faulty cells corresponding to the fault type in the photovoltaic string.

[0090] Specifically, the infrared images collected by the drone during inspection carry temperature information of the photovoltaic modules, which can be temperature values. Therefore, in this embodiment, the temperature value of each pixel in the image of all faulty cells corresponding to this fault type within the photovoltaic string is obtained.

[0091] S32. Calculate the average temperature information of each pixel and use it as the average temperature information corresponding to the fault type.

[0092] Average temperature information generally refers to the average temperature value, which can be used to calculate the power generation loss impact coefficient caused by each type of fault.

[0093] The average temperature T corresponding to the fault type i = The average temperature value of each pixel, where i represents the fault type.

[0094] S33. Obtain the sum of the average temperature information corresponding to all fault types in the photovoltaic string.

[0095] Specifically, for a photovoltaic string, there may be at least one fault type. Therefore, the sum of the average temperature information corresponding to all fault types, ∑T, is calculated. i .

[0096] S34. The ratio of the average temperature information corresponding to the fault type to the sum of the average temperature information is used as the power generation loss impact coefficient corresponding to the fault type.

[0097] Specifically, the power generation loss impact coefficient W corresponding to the fault type i =T i / ∑T i , where i represents the fault type.

[0098] The power generation loss impact coefficient represents the power generation loss impact coefficient caused by this type of fault in the photovoltaic string.

[0099] S12. Calculate the difference between the actual power generation and the theoretical power generation of the photovoltaic string containing the photovoltaic module, and use it as the power generation loss value of the photovoltaic string.

[0100] Specifically, power plants typically obtain the actual power generation of the entire photovoltaic string. Based on information such as irradiance, temperature, and module efficiency at the time corresponding to the actual power generation, they assess and calculate the theoretical power generation of the photovoltaic string under the same conditions. The difference between the theoretical power generation and the actual power generation is taken as the power generation loss L caused by the fault of the string.

[0101] S13. Calculate the component power generation loss value corresponding to the fault information based on the power generation loss value of the photovoltaic string, the area ratio corresponding to the fault information, and the power generation loss impact coefficient.

[0102] In practical applications, the component power generation loss value corresponding to the fault information refers to the loss value when the photovoltaic module loses power generation due to each type of fault.

[0103] The specific process for calculating the component power generation loss value corresponding to the fault information includes:

[0104] 1) Calculate the product of the power generation loss value of the photovoltaic string and the power generation loss influence coefficient, and use it as the power generation quantum loss value when the fault type causes the photovoltaic string to generate power generation loss.

[0105] In this embodiment, the power generation quantum loss value L when the fault type causes the photovoltaic string to experience a power generation loss is... i =L*W i .

[0106] Where L is the power generation loss value of the photovoltaic string, and W i This is the power generation loss impact coefficient corresponding to the fault type.

[0107] 2) The product of the power generation quantum loss value and the string area ratio is used as the module power generation loss value when the fault type causes the photovoltaic module to generate power generation loss.

[0108] Specifically, based on the power generation loss of each fault type in the photovoltaic string, and the percentage of string area occupied by each fault type in the string calculated above, the module power generation loss value F can be calculated. ij =P ij *L i Where i represents the fault type and j represents the photovoltaic module.

[0109] S14. Based on the power generation loss value of the component, calculate the total power generation loss value of the photovoltaic component.

[0110] Specifically, through the above steps, the power generation loss value corresponding to each fault type in the photovoltaic module is calculated. A photovoltaic module may have multiple faults. Therefore, based on the specific fault situation in the photovoltaic module, the sum of all the power generation loss values ​​corresponding to the photovoltaic module is taken as the total power generation loss value A of the photovoltaic module. j =∑F ij .

[0111] In another implementation of the present invention, a reasonable operation and maintenance strategy can be formulated by comprehensively evaluating whether the photovoltaic module needs to be repaired or replaced based on the proportion of power generation loss of the photovoltaic module, combined with operation and maintenance costs, power generation gain benefits, etc.

[0112] Specifically, after calculating the total power generation loss of the photovoltaic module, if the total power generation loss of the photovoltaic module exceeds a preset loss threshold, a prompt message to replace the photovoltaic module is output.

[0113] In detail, the preset loss threshold can be set according to the actual scenario. If the total power generation loss of the photovoltaic module is greater than the preset loss threshold, it means that the total power generation loss of the photovoltaic module is large. At this time, the photovoltaic module can be replaced. Then, a photovoltaic module replacement prompt message can be output to the maintenance personnel's terminal to notify the maintenance personnel to replace the photovoltaic module in time.

[0114] If the total power generation loss of the photovoltaic module does not exceed a preset loss threshold, calculate the power generation gain after performing a preset operation on the photovoltaic module, as well as the preset operation cost. The preset operation includes replacement or repair. If the power generation gain exceeds the preset operation cost, output a prompt message to perform the preset operation.

[0115] Specifically, if the total power generation loss of the photovoltaic module is not greater than the preset loss threshold, it indicates that the power generation loss caused by the photovoltaic module failure is within a controllable range. In this case, replacing or repairing the photovoltaic module will bring a certain power generation gain. Only when this power generation gain is greater than the corresponding discount of the operation and maintenance cost of replacing or repairing a module will the replacement or repair of the module be considered. Therefore, a preset operation prompt message will be output only when the power generation gain is greater than the preset operation cost.

[0116] In this embodiment, fault information of photovoltaic modules is obtained, and the area proportion and power generation loss impact coefficient corresponding to the fault information are calculated. The difference between the actual power generation and the theoretical power generation of the photovoltaic string containing the photovoltaic module is calculated and used as the power generation loss value of the photovoltaic string. Based on the power generation loss value of the photovoltaic string, the area proportion and power generation loss impact coefficient corresponding to the fault information, the power generation loss value of the module corresponding to the fault information is calculated. Based on the power generation loss value of the module, the total power generation loss value of the photovoltaic module is calculated. Through this invention, the power generation loss of photovoltaic modules caused by faults can be calculated, solving the problem that when photovoltaic modules fail, it is urgent to determine the power generation loss of photovoltaic modules caused by faults to provide a reference for operation and maintenance.

[0117] In addition, this invention can quantitatively assess the power generation loss ratio of faulty components after UAV inspection, providing an effective reference for the formulation of reasonable operation and maintenance strategies.

[0118] Optionally, based on the above-described embodiment of a method for calculating the power generation loss of a photovoltaic module, another embodiment of the present invention provides a device for calculating the power generation loss of a photovoltaic module, referring to... Figure 4 ,include:

[0119] The data calculation module 11 is used to acquire fault information of photovoltaic modules and calculate the area ratio and power generation loss impact coefficient corresponding to the fault information.

[0120] The first loss value calculation module 12 is used to calculate the difference between the actual power generation and the theoretical power generation of the photovoltaic string in which the photovoltaic module is located, and use it as the power generation loss value of the photovoltaic string.

[0121] The second loss value calculation module 13 is used to calculate the component power generation loss value corresponding to the fault information based on the power generation loss value of the photovoltaic string, the area ratio corresponding to the fault information, and the power generation loss influence coefficient.

[0122] The third loss value calculation module 14 is used to calculate the total power generation loss value of the photovoltaic module based on the power generation loss value of the module.

[0123] Furthermore, the fault information includes the fault type and the faulty battery cell information corresponding to the fault type; the faulty battery cell information includes the number and location of the faulty battery cells.

[0124] Data calculation module 11 includes:

[0125] The information acquisition submodule is used to acquire the structural information of the photovoltaic module;

[0126] The first proportion calculation submodule is used to calculate the proportion of the component area of ​​the faulty battery cell corresponding to the fault type in the photovoltaic module based on the structural information of the photovoltaic module, the fault type and the faulty battery cell information;

[0127] The second proportion calculation submodule is used to determine the string area proportion corresponding to the fault type based on the component area proportion.

[0128] Furthermore, the second percentage calculation submodule includes:

[0129] The information acquisition unit is used to acquire the structural information of the photovoltaic string in which the photovoltaic module is located;

[0130] The first proportion calculation unit is used to calculate the sub-area proportion of the faulty cell corresponding to the fault type in the photovoltaic module in the photovoltaic string based on the component area proportion and the structural information of the photovoltaic string;

[0131] The percentage sum acquisition unit is used to acquire the sum of the sub-area percentages corresponding to all the fault types in the photovoltaic string;

[0132] The second proportion calculation unit is used to take the ratio of the sub-area proportion to the sum of the sub-area proportions as the string area proportion corresponding to the fault type.

[0133] Furthermore, the data computing module 11 includes:

[0134] The first temperature acquisition submodule is used to acquire the temperature information of each pixel in the image of all faulty cells corresponding to the fault type in the photovoltaic string;

[0135] The temperature calculation submodule is used to calculate the average value of the temperature information of each pixel and use it as the average temperature information corresponding to the fault type.

[0136] The second temperature acquisition submodule is used to acquire the sum of the average temperature information corresponding to all fault types in the photovoltaic string;

[0137] The coefficient determination submodule is used to take the average temperature information corresponding to the fault type and the ratio of the average temperature information to the sum of the average temperature information as the power generation loss impact coefficient corresponding to the fault type.

[0138] Furthermore, the second loss value calculation module 13 is specifically used for:

[0139] Calculate the product of the power generation loss value of the photovoltaic string and the power generation loss influence coefficient, and use it as the power generation quantum loss value when the fault type causes the photovoltaic string to generate power generation loss;

[0140] The product of the power generation quantum loss value and the string area ratio is used as the power generation loss value of the photovoltaic module when the fault type causes the photovoltaic module to generate power loss.

[0141] Furthermore, the third loss value calculation module 14 is specifically used for:

[0142] The sum of the power generation loss values ​​of all the photovoltaic modules corresponding to the photovoltaic module is taken as the total power generation loss value of the photovoltaic module.

[0143] Furthermore, it also includes:

[0144] The first information output module is used to output a prompt message to replace the photovoltaic module when the total power generation loss of the photovoltaic module is greater than a preset loss threshold.

[0145] Furthermore, it also includes:

[0146] The data calculation module is used to calculate the power generation gain after performing a preset operation on the photovoltaic module, and the preset operation cost, provided that the total power generation loss of the photovoltaic module is not greater than a preset loss threshold; the preset operation includes replacement or repair.

[0147] The second information output module is used to output a preset operation prompt message when the power generation gain is greater than the preset operation cost.

[0148] In this embodiment, fault information of photovoltaic modules is obtained, and the area proportion and power generation loss impact coefficient corresponding to the fault information are calculated. The difference between the actual power generation and the theoretical power generation of the photovoltaic string containing the photovoltaic module is calculated and used as the power generation loss value of the photovoltaic string. Based on the power generation loss value of the photovoltaic string, the area proportion and power generation loss impact coefficient corresponding to the fault information, the power generation loss value of the module corresponding to the fault information is calculated. Based on the power generation loss value of the module, the total power generation loss value of the photovoltaic module is calculated. Through this invention, the power generation loss of photovoltaic modules caused by faults can be calculated, solving the problem that when photovoltaic modules fail, it is urgent to determine the power generation loss of photovoltaic modules caused by faults to provide a reference for operation and maintenance.

[0149] It should be noted that the working process of each module, submodule and unit in this embodiment is described in the corresponding description in the above embodiment, and will not be repeated here.

[0150] Optionally, based on the above-described method and apparatus for calculating power generation loss of a photovoltaic module, another embodiment of the present invention provides an electronic device, including: a memory and a processor;

[0151] The memory is used to store programs;

[0152] The processor calls the program and executes the above-described method for calculating the power generation loss of a photovoltaic module.

[0153] In this embodiment, fault information of photovoltaic modules is obtained, and the area proportion and power generation loss impact coefficient corresponding to the fault information are calculated. The difference between the actual power generation and the theoretical power generation of the photovoltaic string containing the photovoltaic module is calculated and used as the power generation loss value of the photovoltaic string. Based on the power generation loss value of the photovoltaic string, the area proportion and power generation loss impact coefficient corresponding to the fault information, the power generation loss value of the module corresponding to the fault information is calculated. Based on the power generation loss value of the module, the total power generation loss value of the photovoltaic module is calculated. Through this invention, the power generation loss of photovoltaic modules caused by faults can be calculated, solving the problem that when photovoltaic modules fail, it is urgent to determine the power generation loss of photovoltaic modules caused by faults to provide a reference for operation and maintenance.

[0154] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for calculating the power generation loss of a photovoltaic module, characterized in that, include: Obtain fault information of photovoltaic modules and calculate the area ratio and power generation loss impact coefficient corresponding to the fault information; Calculate the difference between the actual power generation and the theoretical power generation of the photovoltaic string containing the photovoltaic module, and use it as the power generation loss value of the photovoltaic string; Based on the power generation loss value of the photovoltaic string, the area ratio corresponding to the fault information, and the power generation loss impact coefficient, calculate the power generation loss value of the module corresponding to the fault information; Based on the power generation loss value of the component, calculate the total power generation loss value of the photovoltaic module; The fault information includes the fault type and the faulty battery cell information corresponding to the fault type; the faulty battery cell information includes the number and location of the faulty battery cells. Calculating the area percentage corresponding to the fault information includes: Obtain the structural information of the photovoltaic module; Based on the structural information of the photovoltaic module, the fault type, and the faulty cell information, calculate the percentage of the module area of ​​the faulty cell corresponding to the fault type in the photovoltaic module. Based on the component area ratio, the string area ratio corresponding to the fault type is determined.

2. The calculation method according to claim 1, characterized in that, Based on the component area ratio, the string area ratio corresponding to the fault type is determined, including: Obtain the structural information of the photovoltaic string containing the photovoltaic module; Based on the component area ratio and the structural information of the photovoltaic string, calculate the sub-area ratio of the faulty cell corresponding to the fault type in the photovoltaic module in the photovoltaic string. Obtain the sum of the sub-area percentages corresponding to all the fault types in the photovoltaic string; The ratio of the sub-area percentage to the sum of the sub-area percentages is taken as the string area percentage corresponding to the fault type.

3. The calculation method according to claim 1, characterized in that, Calculate the power generation loss impact coefficient corresponding to the fault information, including: Obtain the temperature information of each pixel in the image of all faulty cells corresponding to the fault type in the photovoltaic string; Calculate the average temperature information of each pixel and use it as the average temperature information corresponding to the fault type; Obtain the sum of the average temperature information corresponding to all fault types in the photovoltaic string; The ratio of the average temperature information corresponding to the fault type to the sum of the average temperature information is used as the power generation loss impact coefficient corresponding to the fault type.

4. The calculation method according to claim 1, characterized in that, Based on the power generation loss value of the photovoltaic string, the area proportion corresponding to the fault information, and the power generation loss impact coefficient, the module power generation loss value corresponding to the fault information is calculated, including: Calculate the product of the power generation loss value of the photovoltaic string and the power generation loss influence coefficient, and use it as the power generation quantum loss value when the fault type causes the photovoltaic string to generate power generation loss; The product of the power generation quantum loss value and the string area ratio is used as the power generation loss value of the photovoltaic module when the fault type causes the photovoltaic module to generate power loss.

5. The calculation method according to claim 4, characterized in that, Based on the power generation loss value of the aforementioned components, the total power generation loss value of the photovoltaic components is calculated, including: The sum of the power generation loss values ​​of all the photovoltaic modules corresponding to the photovoltaic module is taken as the total power generation loss value of the photovoltaic module.

6. The calculation method according to claim 1, characterized in that, After calculating the total power generation loss of the photovoltaic module, the following is also included: If the total power generation loss of the photovoltaic module exceeds a preset loss threshold, a prompt to replace the photovoltaic module will be output.

7. The calculation method according to claim 6, characterized in that, If the total power generation loss of the photovoltaic module is not greater than a preset loss threshold, the method further includes: Calculate the power generation gain after performing preset operations on the photovoltaic module, as well as the preset operation cost; the preset operations include replacement or repair. If the power generation gain is greater than the preset operating cost, output a prompt message to perform the preset operation.

8. A device for calculating the power generation loss of a photovoltaic module, characterized in that, include: The data calculation module is used to acquire fault information of photovoltaic modules and calculate the area ratio and power generation loss impact coefficient corresponding to the fault information. The first loss value calculation module is used to calculate the difference between the actual power generation and the theoretical power generation of the photovoltaic string in which the photovoltaic module is located, and use it as the power generation loss value of the photovoltaic string. The second loss value calculation module is used to calculate the component power generation loss value corresponding to the fault information based on the power generation loss value of the photovoltaic string, the area ratio corresponding to the fault information, and the power generation loss impact coefficient. The third loss value calculation module is used to calculate the total power generation loss value of the photovoltaic module based on the power generation loss value of the module. The fault information includes the fault type and the faulty battery cell information corresponding to the fault type; the faulty battery cell information includes the number and location of the faulty battery cells. The data calculation module calculates the area ratio corresponding to the fault information, specifically for: obtaining the structural information of the photovoltaic module; calculating the area ratio of the faulty cell corresponding to the fault type in the photovoltaic module based on the structural information of the photovoltaic module, the fault type, and the faulty cell information; and determining the string area ratio corresponding to the fault type based on the area ratio of the module.

9. An electronic device, characterized in that, include: Memory and processor; The memory is used to store programs; The processor calls the program and executes a method for calculating the power generation loss of a photovoltaic module as described in any one of claims 1-7.

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