Method and device for processing photovoltaic IV data, electronic equipment and storage medium

Abstract

The application provides a photovoltaic IV data processing method and device, electronic equipment and storage medium. The method comprises the following steps: acquiring IV data obtained by scanning a target photovoltaic module in a target period; performing normalization processing on the IV data according to one of at least one preset normalization mode; the at least one preset normalization mode comprises a normalization mode based on a selected standard IV curve of the target photovoltaic module; wherein the selected standard IV curve is a standard IV curve of the target photovoltaic module corresponding to the irradiance value of the target period corrected by a preset correction mode, and the preset correction mode is a correction mode for correcting the irradiance value collected by an irradiance meter according to the angle parameter of the target photovoltaic module. The application can improve the diagnosis effect of the photovoltaic module.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic new energy technology, and in particular to a method, apparatus, electronic device and storage medium for processing photovoltaic IV data. Background Technology

[0002] Photovoltaic power generation is a type of solar power generation technology that uses the photovoltaic effect to convert light energy into electrical energy. Through long-term technological iteration and market cultivation, the photovoltaic industry has become a key force in the development of new energy sources.

[0003] Existing photovoltaic (PV) power generation systems mainly consist of PV modules, controllers, and inverters. Among these, the PV modules, as the core component of the system, directly affect the power generation efficiency. Currently, PV modules can be diagnosed using data such as IV curves (current-voltage curves) to detect faults in a timely manner.

[0004] However, when diagnosing photovoltaic modules, due to differences in environmental conditions and product models, the IV data of different photovoltaic modules under the same photovoltaic power station vary greatly, resulting in poor diagnostic results for photovoltaic modules. Summary of the Invention

[0005] This invention provides a method, apparatus, electronic device, and storage medium for processing photovoltaic IV data, in order to solve the problem of poor diagnostic performance of photovoltaic modules in the prior art.

[0006] In a first aspect, embodiments of the present invention provide a method for processing photovoltaic IV data, including:

[0007] Obtain IV data from scanning the target photovoltaic module within the target time period;

[0008] The IV data is normalized according to at least one of the preset normalization methods.

[0009] At least one preset normalization method includes:

[0010] The normalization process is performed based on the standard IV curve of the selected target photovoltaic module. The selected standard IV curve is the standard IV curve corresponding to the irradiance value obtained by correction using a preset correction method. The preset correction method is to correct the irradiance value collected by the radiometer during the target time period based on the angle parameters of the target photovoltaic module. The angle parameters of the target photovoltaic module include the solar altitude angle and solar azimuth angle of the target photovoltaic module's location during the target time period, the photovoltaic panel tilt angle of the target photovoltaic module, the angle between the photovoltaic panel and the photovoltaic panel at the preset azimuth, the radiometer tilt angle of the radiometer corresponding to the target photovoltaic module, and the angle between the radiometer and the radiometer at the preset azimuth.

[0011] Secondly, embodiments of the present invention provide a photovoltaic IV data processing apparatus, comprising:

[0012] The acquisition module is used to acquire IV data obtained by scanning the target photovoltaic module within the target time period;

[0013] The normalization module is used to normalize IV data according to one of at least one preset normalization method.

[0014] At least one preset normalization method includes:

[0015] The normalization process is performed based on the standard IV curve of the selected target photovoltaic module. The selected standard IV curve is the standard IV curve corresponding to the irradiance value obtained by correction using a preset correction method. The preset correction method is to correct the irradiance value collected by the radiometer during the target time period based on the angle parameters of the target photovoltaic module. The angle parameters of the target photovoltaic module include the solar altitude angle and solar azimuth angle of the target photovoltaic module's location during the target time period, the photovoltaic panel tilt angle of the target photovoltaic module, the angle between the photovoltaic panel and the photovoltaic panel at the preset azimuth, the radiometer tilt angle of the radiometer corresponding to the target photovoltaic module, and the angle between the radiometer and the radiometer at the preset azimuth.

[0016] Thirdly, embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation of the first aspect.

[0017] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation thereof.

[0018] This invention provides a method, apparatus, electronic device, and storage medium for processing photovoltaic (PV) IV data. By employing a preset normalization method, the IV data obtained from scanning target PV modules within a target time period is normalized. This allows for the standardization of IV data from different models of PV modules under varying environmental conditions to a common diagnostic dimension, resolving the issue of discrepancies in IV data across different PV modules. Consequently, when using IV data based on a unified standard for diagnosis, the consistency of the standard effectively improves diagnostic results.

[0019] Furthermore, to address the issue of inaccurate irradiance values ​​for photovoltaic modules caused by inconsistent installation angles between the radiometer and the photovoltaic module, a method is proposed to normalize the data based on a standard IV curve of the selected target photovoltaic module. Since the selected standard IV curve has been calibrated based on the angle parameters of the target photovoltaic module, the irradiance values ​​collected by the radiometer can be accurately obtained through this calibration. This allows for the selection of a precise standard IV curve. Consequently, the normalized IV data obtained after normalization based on this precise standard IV curve better reflects the actual operating conditions of the photovoltaic module, further improving the diagnostic effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a flowchart illustrating the implementation of the photovoltaic IV data processing method provided in this embodiment of the invention.

[0022] Figure 2 This is a schematic diagram of the solar altitude angle and solar azimuth angle provided in an embodiment of the present invention;

[0023] Figure 3 This is an exploded schematic diagram of direct irradiance provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the photovoltaic IV data processing device provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0026] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0028] As described in related technologies, even for the same photovoltaic power plant, due to differences in environmental conditions and product models—for example, a photovoltaic power plant may purchase photovoltaic modules from multiple manufacturers, and the tilt angle and installation orientation of each module may also differ—the IV data of the various photovoltaic modules used in the power plant may vary significantly, even exceeding the numerical range required by existing diagnostic solutions. When diagnosing according to a unified diagnostic standard, diagnostic failures or errors may occur, resulting in poor diagnostic effectiveness.

[0029] Furthermore, for photovoltaic power plants equipped with radiometers, due to factors such as environment and installation methods, there is a certain deviation between the total irradiance received by each photovoltaic module and the total irradiance collected by the radiometer. When the total irradiance collected by the radiometer is directly used as the total irradiance received by the photovoltaic module, it will directly affect the accuracy of the selected standard IV curve. An inaccurate standard IV curve differs from the actual operating conditions of the photovoltaic module, which will affect the subsequent judgment of faults such as dust accumulation and glass breakage, making the diagnostic effect worse.

[0030] To address the problems of the prior art, embodiments of the present invention provide a method, apparatus, electronic device, and storage medium for processing photovoltaic IV data. The method for processing photovoltaic IV data provided by the embodiments of the present invention will be described first below.

[0031] The entity executing the photovoltaic IV data processing method can be a photovoltaic IV data processing device. This device can be any electronic device with data processing capabilities, such as a photovoltaic inverter or a photovoltaic controller. This embodiment of the invention does not impose specific limitations.

[0032] See Figure 1 The document illustrates a flowchart of the photovoltaic IV data processing method provided in an embodiment of the present invention, which is described in detail below:

[0033] Step 101: Obtain IV data from scanning the target photovoltaic module within the target time period.

[0034] In some embodiments, the target photovoltaic module can be any photovoltaic module in any photovoltaic power plant. The target time period can be any time period, such as 10:10 AM to 10:30 AM. During the target time period, the inverter to which the target photovoltaic module belongs can scan the target photovoltaic module at a certain scanning resolution to obtain the IV data of the target photovoltaic module. In this way, the IV data obtained by scanning the target photovoltaic module during the target time period can be acquired.

[0035] Taking a scanning resolution of 128 points as an example, IV data including 128 sets of values ​​can be obtained, with each set of data including a current value and a voltage value.

[0036] Step 102: Normalize the IV data according to at least one preset normalization method.

[0037] By employing a pre-defined normalization method, the IV data obtained from scanning target photovoltaic modules within a specific time period can be normalized. This allows for the standardization of IV data from different models of photovoltaic modules under varying environmental conditions, bringing them to a common diagnostic dimension and resolving the discrepancies in IV data across different modules. Consequently, when diagnosing according to this unified standard, the use of standardized IV data avoids diagnostic failures or errors caused by differences in IV data, thus improving diagnostic accuracy.

[0038] In some embodiments, the preset normalization method for normalizing IV data can be a method of normalizing based on the standard IV curve of the selected target photovoltaic module. Specifically, the selected standard IV curve can be a standard IV curve corresponding to the irradiance value obtained by correction using a preset correction method. This preset correction method can be a method of correcting the irradiance value collected by the radiometer during the target time period based on the angle parameters of the target photovoltaic module. The angle parameters of the target photovoltaic module can include the solar altitude angle and solar azimuth angle of the target photovoltaic module's location during the target time period, the photovoltaic panel tilt angle of the target photovoltaic module, the angle between the photovoltaic panel and the photovoltaic panel at the preset azimuth, the radiometer tilt angle of the radiometer corresponding to the target photovoltaic module, and the angle between the radiometer and the radiometer at the preset azimuth.

[0039] In some embodiments, the solar altitude angle and solar azimuth angle can be obtained using the time zone, latitude and longitude, and target time period of the target photovoltaic module's location, for example, through the PySolar plugin. For the target photovoltaic module and its corresponding radiometer, the tilt angle and included angle used during installation, or the tilt angle and included angle adjusted during subsequent maintenance, can be used. Furthermore, the preset orientation can adopt orientations commonly used in the photovoltaic field, such as due south, due north, etc. Figure 2 As shown, N represents due north, E represents due east, α represents the solar altitude angle, and β represents the solar azimuth angle.

[0040] In one possible implementation of this invention, the preset correction method can be a preset correspondence between angle and correction coefficient. Thus, before normalizing the IV data according to the preset normalization method, the following processing can be performed: determining the correction coefficient corresponding to the angle parameters of the target photovoltaic module based on the preset correspondence between angle and correction coefficient; and correcting the irradiance values ​​collected by the radiometer based on the correction coefficient corresponding to the angle parameters of the target photovoltaic module.

[0041] In some embodiments, the preset correspondence between the angle and the correction coefficient can be a functional relationship composed of the correction coefficient and the angle parameter, for example:

[0042]

[0043]

[0044]

[0045] in, S r δ is the correction factor, δ is the radiometer factor, δ' is the photovoltaic module factor, α is the solar altitude angle, β is the solar azimuth angle, γ is the radiometer angle, γ' is the photovoltaic panel angle, ω is the radiometer tilt angle, and ω' is the photovoltaic panel tilt angle.

[0046] The above functional relationship can be obtained through theoretical calculation. One method of theoretical calculation is given below.

[0047] The direct solar radiation received by photovoltaic panels and radiometers is affected by the solar altitude angle and azimuth angle. Considering the total irradiance as direct solar radiation, and assuming the direct solar irradiance per unit area per unit time is 1, taking a radiometer as an example... Figure 3 As shown, Figure 3 In a, a unit direct irradiance is decomposed into a horizontal component 1 and a vertical component 2. Figure 3 In step b, decomposing the vertical component 2 yields the effective component 4 and the ineffective component 3. Similarly, Figure 3 In step c, level component 1 is decomposed to obtain effective component 7 and ineffective component 8. Furthermore, combining... Figure 3 The radiative influence of the solar azimuth angle in d, and the angle between the radiometer and the radiometer at the preset azimuth, yields components 5 and 6. Through trigonometric function calculations, the formula for calculating the direct irradiance of the radiometer, i.e., the formula for calculating the radiometer coefficient δ, can be obtained. Similarly, the formula for calculating the direct irradiance of the photovoltaic module, i.e., the formula for calculating the photovoltaic module coefficient δ', can be obtained.

[0048] In this way, the angle parameters of the target photovoltaic module can be substituted into the preset correspondence between angle and correction coefficient, and the resulting correction coefficient is the correction coefficient corresponding to the angle parameters of the target photovoltaic module.

[0049] In some embodiments, the functional relationship between the correction coefficient and the angle parameter can also be a relationship that includes the error value generated by the scattered radiation, specifically as follows:

[0050] ;

[0051] in, The error value caused by the scattered radiation can be confirmed through a single measurement.

[0052] In some embodiments, the preset correspondence between the angle and the correction coefficient can also be a functional relationship composed of the angle parameter and the radiometer measurement value, for example:

[0053]

[0054] The theoretical calculation process for the above functional relationship is introduced below. In photovoltaic power plants, total irradiance, diffuse irradiance, and reflected irradiance can be directly obtained through a radiometer.

[0055] For direct irradiance, according to the principle of direct-scatter separation, direct irradiance can be obtained by subtracting scattered irradiance and reflected irradiance from total irradiance, as shown below:

[0056] (1)

[0057] in, Indicates the total irradiance of the radiometer. Indicates the direct irradiance of the radiometer. Indicates the scattered irradiance of the radiometer. This represents the reflected irradiance of the radiometer. When the angle between the radiometer and the horizontal plane is 0°, reflected radiation is not considered.

[0058] Similarly, the formula for calculating the total irradiance of a photovoltaic module is as follows:

[0059] (2)

[0060] in, , , , These represent the total irradiance, direct irradiance, diffuse irradiance, and reflected irradiance received by the photovoltaic module, respectively.

[0061] For direct radiation, as before, the formula for calculating the direct irradiance of a radiometer is as follows:

[0062] (3)

[0063] The formula for calculating the direct irradiance of photovoltaic modules is shown below:

[0064] (4)

[0065] Based on formulas (3) and (4), the formula for direct irradiance on a photovoltaic module can be derived as follows:

[0066] (5)

[0067] For scattered irradiance, commonly used scattering models include the Hay model, the Klucher model, and the Perez model. Taking the Klucher model as an example, the formula for calculating the scattered irradiance of a radiometer is as follows:

[0068] (6)

[0069] in, Indicates the angle of incidence of direct sunlight. The diffuse irradiance received by the horizontal plane. It can be obtained from formula (6). .

[0070] Similarly, the formula for calculating the diffuse irradiance of a photovoltaic module is as follows:

[0071] (7)

[0072] in, .

[0073] The formula for calculating the reflected irradiance of a photovoltaic module is as follows:

[0074] (8)

[0075] in, For ground reflectivity, For the total irradiance on the horizontal plane, according to the principle of direct-scatter separation, we have , It can be obtained from formula (6), thus, The calculation formula is as follows:

[0076] (9)

[0077] In summary, based on formulas (3), (4), and (6), we can obtain the functional relationship between the angle parameter and the radiometer measurement value:

[0078]

[0079] Based on the above functional relationship, the irradiance value of the photovoltaic module during the target period can be calculated from the total irradiance, direct irradiance, diffuse irradiance and reflected irradiance collected by the radiometer during the target period. That is, the actual irradiance value received by the photovoltaic module is obtained by correcting the irradiance value collected by the radiometer.

[0080] In some embodiments, the preset correspondence between angles and correction coefficients can also be a record of the correspondence between correction coefficients corresponding to different angle parameters, such as a table recording the correction coefficients corresponding to various different angle parameters. Specifically, based on the above functional relationship, the correspondence between common angle parameters and correction coefficients can be extracted to form a table.

[0081] In this way, the correction coefficient corresponding to the angle parameter of the target photovoltaic module can be found in the preset correspondence between angle and correction coefficient. For example, by using a common table lookup method, the correction coefficient found is the correction coefficient corresponding to the angle parameter of the target photovoltaic module.

[0082] In some embodiments, when the preset normalization method for normalizing IV data is to normalize it according to the standard IV curve of the selected target photovoltaic module, the normalization process can be as follows: divide all current values ​​in the IV data by the short-circuit current value of the selected standard IV curve to obtain the current value portion of the normalized IV data; divide all voltage values ​​in the IV data by the open-circuit voltage value of the selected standard IV curve to obtain the voltage value portion of the normalized IV data.

[0083] Assuming the short-circuit current value of the selected standard IV curve is 10A and the open-circuit voltage value is 50V, if the current values ​​in the IV data are 0A, 3A, and 9A, and the voltage values ​​are 0V, 10V, and 49V, then the current value portion of the IV data after normalization will be 0, 0.3, and 0.9, and the voltage value portion will be 0, 0.2, and 0.98.

[0084] Through the above correction process, since the selected standard IV curve has been calibrated based on the irradiance values ​​collected by the radiometer according to the angle parameters of the target photovoltaic module, the irradiance value of the photovoltaic module can be accurately obtained. This allows for the selection of a precise standard IV curve. Furthermore, after normalization based on this precise standard IV curve, the obtained normalized IV data better reflects the actual operating conditions of the photovoltaic module, which is beneficial for further improving the diagnostic effect of the photovoltaic module. Moreover, even if other photovoltaic modules or strings malfunction, it does not affect the normalization of the target photovoltaic module or subsequent fault diagnosis and processing.

[0085] In some embodiments, before normalization using a selected standard IV curve, the IV data can be corrected as a whole using the selected standard IV curve to eliminate the influence of using the total irradiance collected by the radiometer as the total irradiance received by the photovoltaic module on the scanned IV data.

[0086] In one possible implementation of this invention, the preset normalization method for normalizing IV data can also be a method of normalizing based on a first maximum short-circuit current value and a first maximum open-circuit voltage value. The first maximum short-circuit current value is the maximum current value obtained by scanning all photovoltaic modules controlled by the inverter to which the target photovoltaic module belongs during the target time period, and the first maximum open-circuit voltage value is the maximum voltage value obtained by scanning all photovoltaic modules controlled by the inverter during the target time period. Accordingly, the normalization process can be as follows: divide all current values ​​in the IV data by the first maximum short-circuit current value to obtain the current value portion of the normalized IV data; divide all voltage values ​​in the IV data by the first maximum open-circuit voltage value to obtain the voltage value portion of the normalized IV data.

[0087] It is worth mentioning that, since photovoltaic power plants are usually diagnosed in string configurations, the above-mentioned normalization method based on the first maximum short-circuit current value and the first maximum open-circuit voltage value is closer to the actual diagnostic conditions of photovoltaic power plants.

[0088] In one possible implementation of this invention, the preset normalization method for normalizing IV data can also be a method of normalizing based on the second maximum short-circuit current value and the second maximum open-circuit voltage value; wherein, the second maximum short-circuit current value is the largest current value in the IV data, or the maximum value among all current values ​​obtained by scanning the photovoltaic power station to which the target photovoltaic module belongs within the target time period; the second maximum open-circuit voltage value is the largest voltage value in the IV data, or the maximum value among all voltage values ​​obtained by scanning the photovoltaic power station within the target time period. Accordingly, the normalization process can be as follows: divide all current values ​​in the IV data by the second maximum short-circuit current value to obtain the current value portion of the normalized IV data; divide all voltage values ​​in the IV data by the second maximum open-circuit voltage value to obtain the voltage value portion of the normalized IV data.

[0089] It is worth mentioning that the above-mentioned normalization method based on the second maximum short-circuit current value and the second maximum open-circuit voltage value can highlight the slope changes and step phenomena in the curve, which is beneficial for subsequent diagnosis of faults related to slope changes and step phenomena. In addition, it also has the advantage of simple operation.

[0090] In this embodiment of the invention, an IV data obtained from scanning the target photovoltaic module within a target time period is normalized using a preset normalization method. This allows the IV data of different models of photovoltaic modules under different environmental conditions to be unified to a common diagnostic dimension according to a unified standard, thus solving the problem of differences in IV data among different photovoltaic modules. Therefore, when using IV data based on a unified standard for diagnosis, the consistency of the standard effectively improves the diagnostic results.

[0091] Furthermore, to address the issue of inaccurate irradiance values ​​for photovoltaic modules caused by inconsistent installation angles between the radiometer and the photovoltaic module, a method is proposed to normalize the data based on a standard IV curve of the selected target photovoltaic module. Since the selected standard IV curve has been calibrated based on the angle parameters of the target photovoltaic module, the irradiance values ​​collected by the radiometer can be accurately obtained through this calibration. This allows for the selection of a precise standard IV curve. Consequently, the normalized IV data obtained after normalization based on this precise standard IV curve better reflects the actual operating conditions of the photovoltaic module, further improving the diagnostic effect.

[0092] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0093] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0094] Figure 4 A schematic diagram of the photovoltaic IV data processing device provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0095] like Figure 4 As shown, the photovoltaic IV data processing device includes:

[0096] The acquisition module 401 is used to acquire IV data obtained by scanning the target photovoltaic module within the target time period;

[0097] The normalization module 402 is used to normalize the IV data according to one of the preset normalization methods.

[0098] At least one preset normalization method includes:

[0099] The normalization process is performed based on the standard IV curve of the selected target photovoltaic module. The selected standard IV curve is the standard IV curve of the target photovoltaic module corresponding to the irradiance value of the target time period obtained by using a preset correction method. The preset correction method is to correct the irradiance value collected by the radiometer according to the angle parameters of the target photovoltaic module. The angle parameters of the target photovoltaic module include the solar altitude angle and solar azimuth angle of the target photovoltaic module's location in the target time period, the photovoltaic panel tilt angle of the target photovoltaic module, the angle between the photovoltaic panel and the photovoltaic panel in the preset azimuth, the radiometer tilt angle of the radiometer corresponding to the target photovoltaic module, and the angle between the radiometer and the radiometer in the preset azimuth.

[0100] In one possible implementation, the normalization module is also used for:

[0101] Divide each current value in the IV data by the largest current value in the selected standard IV curve to obtain the current value portion of the normalized IV data.

[0102] Divide each voltage value in the IV data by the largest voltage value in the selected standard IV curve to obtain the voltage value portion of the normalized IV data.

[0103] In one possible implementation, the photovoltaic IV data processing apparatus further includes a correction module for:

[0104] Based on the preset correspondence between angle and correction coefficient, determine the correction coefficient corresponding to the angle parameter of the target photovoltaic module;

[0105] The irradiance values ​​collected by the radiometer are corrected according to the correction coefficients corresponding to the angle parameters of the target photovoltaic module.

[0106] In one possible implementation, a preset correspondence between angles and correction coefficients records the correction coefficients corresponding to different angle parameters;

[0107] Correspondingly, the calibration module is also used for:

[0108] In the preset correspondence between angle and correction coefficient, find the correction coefficient that corresponds to the angle parameter of the target photovoltaic module;

[0109] The found correction coefficients are determined to be the correction coefficients corresponding to the angle parameters of the target photovoltaic module.

[0110] In one possible implementation, the preset correspondence between angles and correction coefficients includes:

[0111] ;

[0112] ;

[0113] ;

[0114] in, S r δ is the correction factor, δ is the radiometer factor, δ' is the photovoltaic module factor, α is the solar altitude angle, β is the solar azimuth angle, γ is the radiometer angle, γ' is the photovoltaic panel angle, ω is the radiometer tilt angle, and ω' is the photovoltaic panel tilt angle.

[0115] Correspondingly, the calibration module is also used for:

[0116] By substituting the angle parameters of the target photovoltaic module into the preset correspondence between angle and correction coefficient, the obtained correction coefficient is determined as the correction coefficient corresponding to the angle parameters of the target photovoltaic module.

[0117] In one possible implementation, at least one preset normalization method further includes:

[0118] The normalization process is based on the first maximum short-circuit current value and the first maximum open-circuit voltage value; wherein, the first maximum short-circuit current value is the maximum value among the current values ​​obtained by the inverter to which the target photovoltaic module belongs during the target time period when scanning all photovoltaic modules controlled by it, and the first maximum open-circuit voltage value is the maximum value among the voltage values ​​obtained by the inverter during the target time period when scanning all photovoltaic modules controlled by it.

[0119] Correspondingly, the normalization module is also used for:

[0120] Divide all current values ​​in the IV data by the first maximum short-circuit current value to obtain the current value portion of the normalized IV data.

[0121] Divide each voltage value in the IV data by the first maximum open-circuit voltage value to obtain the voltage value portion of the normalized IV data.

[0122] In one possible implementation, at least one preset normalization method further includes:

[0123] The normalization process is based on the second maximum short-circuit current value and the second maximum open-circuit voltage value; wherein, the second maximum short-circuit current value is the largest current value in the IV data, or the maximum value among all current values ​​obtained by scanning the photovoltaic power station to which the target photovoltaic module belongs within the target time period; the second maximum open-circuit voltage value is the largest voltage value in the IV data, or the maximum value among all voltage values ​​obtained by scanning the photovoltaic power station within the target time period.

[0124] Correspondingly, the normalization module is also used for:

[0125] Divide all current values ​​in the IV data by the second maximum short-circuit current value to obtain the current value portion of the normalized IV data.

[0126] Divide each voltage value in the IV data by the second maximum open-circuit voltage value to obtain the voltage value portion of the normalized IV data.

[0127] In this embodiment of the invention, an IV data obtained from scanning the target photovoltaic module within a target time period is normalized using a preset normalization method. This allows the IV data of different models of photovoltaic modules under different environmental conditions to be unified to a common diagnostic dimension according to a unified standard, thus solving the problem of differences in IV data among different photovoltaic modules. Therefore, when using IV data based on a unified standard for diagnosis, the consistency of the standard effectively improves the diagnostic results.

[0128] Furthermore, to address the issue of inaccurate irradiance values ​​for photovoltaic modules caused by inconsistent installation angles between the radiometer and the photovoltaic module, a method is proposed to normalize the data based on a standard IV curve of the selected target photovoltaic module. Since the selected standard IV curve has been calibrated based on the angle parameters of the target photovoltaic module, the irradiance values ​​collected by the radiometer can be accurately obtained through this calibration. This allows for the selection of a precise standard IV curve. Consequently, the normalized IV data obtained after normalization based on this precise standard IV curve better reflects the actual operating conditions of the photovoltaic module, further improving the diagnostic effect.

[0129] Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Figure 5 As shown, the electronic device 5 in this embodiment includes: a processor 50, a memory 51, and a computer program 52 stored in the memory 51 and executable on the processor 50. When the processor 50 executes the computer program 52, it implements the steps in the various photovoltaic IV data processing method embodiments described above, for example... Figure 1 Steps 101 to 102 are shown. Alternatively, when processor 50 executes computer program 52, it implements the functions of each module in the above-described device embodiments, for example... Figure 5 The functions of modules 401 to 402 are shown.

[0130] For example, computer program 52 can be divided into one or more modules, one or more modules are stored in memory 51 and executed by processor 50 to perform the present invention. One or more modules can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 52 in electronic device 5. For example, computer program 52 can be divided into... Figure 5 Modules 401 to 402 are shown.

[0131] Electronic device 5 may include, but is not limited to, processor 50 and memory 51. Those skilled in the art will understand that... Figure 5 This is merely an example of electronic device 5 and does not constitute a limitation on electronic device 5. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0132] The processor 50 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0133] The memory 51 can be an internal storage unit of the electronic device 5, such as a hard disk or memory. The memory 51 can also be an external storage device of the electronic device 5, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 51 can include both internal and external storage units of the electronic device 5. The memory 51 is used to store the computer program and other programs and data required by the electronic device. The memory 51 can also be used to temporarily store data that has been output or will be output.

[0134] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0135] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0136] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0137] In the embodiments provided by this invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0138] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0139] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0140] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above-described photovoltaic IV data processing method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0141] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for processing photovoltaic IV data, characterized in that, include: Obtain IV data from scanning the target photovoltaic module within the target time period; The IV data is normalized according to at least one preset normalization method. The at least one preset normalization method includes: The normalization process is performed based on the standard IV curve of the selected target photovoltaic module. The selected standard IV curve corresponds to the irradiance value obtained by correction using a preset correction method. This preset correction method involves correcting the irradiance value collected by the radiometer during the target time period based on the angle parameters of the target photovoltaic module. The angle parameters of the target photovoltaic module include the solar altitude angle and solar azimuth angle at the target photovoltaic module's location during the target time period, the photovoltaic panel tilt angle of the target photovoltaic module, the angle between the photovoltaic panel and a photovoltaic panel at a preset azimuth, the radiometer tilt angle of the radiometer corresponding to the target photovoltaic module, and the angle between the radiometer and a radiometer at a preset azimuth. The step of normalizing the IV data according to at least one preset normalization method includes: Divide all current values ​​in the IV data by the short-circuit current value of the selected standard IV curve to obtain the normalized current value portion of the IV data. Divide all voltage values ​​in the IV data by the open-circuit voltage value of the selected standard IV curve to obtain the voltage value portion of the IV data after normalization. Before normalizing the IV data according to at least one preset normalization method, the method further includes: Based on the preset correspondence between angle and correction coefficient, the correction coefficient corresponding to the angle parameter of the target photovoltaic module is determined; The irradiance values ​​collected by the radiometer are corrected according to the correction coefficient corresponding to the angle parameters of the target photovoltaic module. The preset correspondence between the angle and the correction coefficient includes: ； ； ； in, S r δ is the correction coefficient, δ' is the radiometer coefficient, δ' is the photovoltaic module coefficient, α is the solar altitude angle, β is the solar azimuth angle, γ is the radiometer included angle, γ' is the photovoltaic panel included angle, ω is the radiometer tilt angle, and ω' is the photovoltaic panel tilt angle. The step of determining the correction coefficient corresponding to the angle parameter of the target photovoltaic module based on the preset correspondence between the angle and the correction coefficient includes: Substitute the angle parameters of the target photovoltaic module into the preset correspondence between the angle and the correction coefficient, and determine the resulting correction coefficient as the correction coefficient corresponding to the angle parameters of the target photovoltaic module.

2. The method for processing photovoltaic IV data according to claim 1, characterized in that, The preset correspondence between angles and correction coefficients records the correction coefficients corresponding to different angle parameters. The step of determining the correction coefficient corresponding to the angle parameter of the target photovoltaic module based on the preset correspondence between the angle and the correction coefficient includes: In the preset correspondence between the angle and the correction coefficient, find the correction coefficient corresponding to the angle parameter of the target photovoltaic module; The found correction coefficients are determined as the correction coefficients corresponding to the angle parameters of the target photovoltaic module.

3. The method for processing photovoltaic IV data according to claim 1, characterized in that, The at least one preset normalization method further includes: The normalization process is based on the first maximum short-circuit current value and the first maximum open-circuit voltage value; wherein, the first maximum short-circuit current value is the maximum value among the current values ​​obtained by the inverter to which the target photovoltaic module belongs during the target time period when scanning all photovoltaic modules controlled by it, and the first maximum open-circuit voltage value is the maximum value among the voltage values ​​obtained by the inverter during the target time period when scanning all photovoltaic modules controlled by it. The step of normalizing the IV data according to at least one preset normalization method includes: Divide all current values ​​in the IV data by the first maximum short-circuit current value to obtain the current value portion of the IV data after normalization. Divide all voltage values ​​in the IV data by the first maximum open-circuit voltage value to obtain the voltage value portion of the IV data after normalization.

4. The method for processing photovoltaic IV data according to claim 1, characterized in that, The at least one preset normalization method further includes: The normalization process is based on the second maximum short-circuit current value and the second maximum open-circuit voltage value; wherein, the second maximum short-circuit current value is the largest current value in the IV data, or the maximum value among all current values ​​obtained by the photovoltaic power station to which the target photovoltaic module belongs during the target time period; the second maximum open-circuit voltage value is the largest voltage value in the IV data, or the maximum value among all voltage values ​​obtained by the photovoltaic power station during the target time period. The step of normalizing the IV data according to at least one preset normalization method includes: Divide all current values ​​in the IV data by the second maximum short-circuit current value to obtain the current value portion of the IV data after normalization. Divide all voltage values ​​in the IV data by the second maximum open-circuit voltage value to obtain the voltage value portion of the IV data after normalization.

5. A photovoltaic IV data processing device, characterized in that, include: The acquisition module is used to acquire IV data obtained by scanning the target photovoltaic module within the target time period; The normalization module is used to normalize the IV data according to one of at least one preset normalization method. The at least one preset normalization method includes: The normalization process is performed based on the standard IV curve of the selected target photovoltaic module. The selected standard IV curve corresponds to the irradiance value obtained by correction using a preset correction method. This preset correction method involves correcting the irradiance value collected by the radiometer during the target time period based on the angle parameters of the target photovoltaic module. The angle parameters of the target photovoltaic module include the solar altitude angle and solar azimuth angle at the target photovoltaic module's location during the target time period, the photovoltaic panel tilt angle of the target photovoltaic module, the angle between the photovoltaic panel and a photovoltaic panel at a preset azimuth, the radiometer tilt angle of the radiometer corresponding to the target photovoltaic module, and the angle between the radiometer and a radiometer at a preset azimuth. The normalization module is also used for: Divide all current values ​​in the IV data by the short-circuit current value of the selected standard IV curve to obtain the normalized current value portion of the IV data. Divide all voltage values ​​in the IV data by the open-circuit voltage value of the selected standard IV curve to obtain the voltage value portion of the IV data after normalization. The photovoltaic IV data processing device also includes a correction module for: Based on the preset correspondence between angle and correction coefficient, determine the correction coefficient corresponding to the angle parameter of the target photovoltaic module; The irradiance values ​​collected by the radiometer are corrected according to the correction coefficients corresponding to the angle parameters of the target photovoltaic module. The preset correspondence between the angle and the correction coefficient includes: ； ； ； in, S r δ is the correction factor, δ is the radiometer factor, δ' is the photovoltaic module factor, α is the solar altitude angle, β is the solar azimuth angle, γ is the radiometer angle, γ' is the photovoltaic panel angle, ω is the radiometer tilt angle, and ω' is the photovoltaic panel tilt angle. Accordingly, the correction module is also used for: By substituting the angle parameters of the target photovoltaic module into the preset correspondence between angle and correction coefficient, the obtained correction coefficient is determined as the correction coefficient corresponding to the angle parameters of the target photovoltaic module.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the photovoltaic IV data processing method as described in any one of claims 1 to 4.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the photovoltaic IV data processing method as described in any one of claims 1 to 4.

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