A method and system for calculating a component of irradiation on an inclined surface

Abstract

The application discloses a kind of calculation method and system for predicting inclined plane irradiation component, comprising the following steps: obtaining the temporary data of three-party radiation and the direct radiation of photovoltaic field in fixed position;Obtain the first correlation coefficient between the first temporary data and the direct radiation;Obtain the total inclined radiation of the three-party radiation of weather station;Obtain the second correlation coefficient between the temporary data and the total inclined radiation;The actual component of the inclined plane irradiation of photovoltaic field is calculated according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation.This scheme can set up the same collection equipment of information such as inclination angle and height of weather station and field station temporarily under the premise of not carrying out engineering modification, and the equipment is withdrawn after big data calculation, and the total data of photovoltaic area inclined plane irradiation can be directly calculated by using weather station data in later period.

Description

Technical Field

[0001] The present invention relates to the technical field of radiation exposure acquisition, and in particular to a calculation method and system for predicting radiation components of an inclined surface. Background Art

[0002] The irradiance of horizontal and inclined surfaces plays an important role in each system of a photovoltaic power station. The irradiance of inclined surface consists of three components: direct irradiance of inclined surface, scattered irradiance of inclined surface, and reflected irradiance of inclined surface. For cost and productization of meteorological observation equipment, photovoltaic power stations do not have three meters: direct irradiance meter of inclined surface, scattered irradiance meter of inclined surface, and reflected irradiance meter of inclined surface. Usually, there is only total irradiance meter of inclined surface, total irradiance meter of horizontal surface, and scattered irradiance meter of horizontal surface. These total meters can provide comprehensive information about the irradiance of the environment in which the power station is located. Through reasonable data analysis and processing, the approximate value of each irradiance component on the inclined surface can be calculated, but the accuracy is difficult to control;

[0003] On the other hand, due to the limitations of the weather station's power supply, network and other factors, the meter is usually not set in the photovoltaic matrix, or due to the terrain restrictions of the photovoltaic array, the tilt meter is not consistent with the requirements of all photovoltaic modules, the same tilt, height, and environment. As a result, the directly monitored inclined surface irradiation data has a large deviation from the actual irradiation data of the inclined surface of the photovoltaic panel. Especially considering the influence of the setting height and environment, the deviation of the inclined surface irradiation component is very large. This deviation will have a particularly prominent impact on bifacial power generation modules, and will have a great impact on various systems that require inclined surface irradiation as a basis. Summary of the Invention

[0004] In response to the above-mentioned defects, the purpose of the present invention is to propose a calculation method for predicting the irradiation component of an inclined surface. By obtaining different proportional relationships, and then obtaining the predicted amount of the irradiation component of the inclined surface through the total inclined radiation and the proportional relationship, the detection cost can be reduced while improving the prediction accuracy.

[0005] To achieve this purpose, the present invention adopts the following technical solution: a calculation method for predicting the irradiance component of an inclined surface, comprising the following steps:

[0006] Obtain temporary data of tripartite radiation at a fixed location and direct radiation of the photovoltaic field;

[0007] obtaining a first correlation coefficient between the temporary data and the direct radiation amount;

[0008] Get the total tilt radiation of the three-way radiation of the weather station;

[0009] obtaining a second correlation coefficient between the temporary data and the total oblique radiation;

[0010] The actual component of the inclined surface irradiation of the photovoltaic field is calculated according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation.

[0011] Preferably, the temporary data includes the first inclined surface scattered amount, the first inclined surface direct radiation amount and the first ground reflected radiation amount;

[0012] The direct radiation includes the second inclined surface scattered radiation, the second inclined surface direct radiation and the second ground reflected radiation.

[0013] Preferably, the first correlation coefficient includes a first scattering coefficient, a first direct radiation coefficient, and a first reflection coefficient;

[0014] The first scattering coefficient is the ratio between the scattering amount of the first inclined surface and the scattering amount of the second inclined surface;

[0015] The first direct radiation coefficient is the ratio between the direct radiation of the first inclined surface and the direct radiation of the second inclined surface;

[0016] The first reflection coefficient is a ratio of the first ground-reflected radiation to the second ground-reflected radiation.

[0017] Preferably, the second correlation coefficient includes a second scattering coefficient, a second direct radiation coefficient and a second reflection coefficient;

[0018] The second scattering coefficient is the ratio between the first inclined surface scattering and the total inclined radiation;

[0019] The second direct radiation coefficient is the ratio between the direct radiation of the first inclined surface and the total inclined radiation;

[0020] The second reflection coefficient is the ratio of the first ground reflected radiation to the total inclined radiation.

[0021] Preferably, the actual components of the inclined surface radiation include actual inclined surface scattered radiation, actual inclined surface direct radiation, and actual ground reflected radiation;

[0022] The actual inclined surface scattering amount is obtained by multiplying the second scattering amount coefficient and the total inclined radiation amount by the first scattering amount coefficient;

[0023] The actual direct radiation of the inclined surface is obtained by multiplying the second direct radiation coefficient and the total inclined radiation by the first direct radiation coefficient;

[0024] The actual ground reflected radiation is obtained by multiplying the second reflection coefficient and the total inclined radiation by the first reflection coefficient.

[0025] A calculation system for predicting irradiance components on an inclined surface, using the calculation method for predicting irradiance components on an inclined surface, comprising a first acquisition module, a second acquisition module, a first coefficient acquisition module, a second coefficient acquisition module, and a calculation module;

[0026] The first acquisition module acquires temporary data of three-way radiation and direct radiation of the photovoltaic field at a fixed position;

[0027] The second acquisition module is used to obtain the total inclined radiation of the three-way radiation of the weather station;

[0028] The first coefficient acquisition module is used to obtain a first correlation coefficient based on temporary data and direct radiation;

[0029] The second coefficient acquisition module is used to obtain a second correlation coefficient based on the temporary data and the total tilt radiation;

[0030] The calculation module is used to calculate the actual component of the inclined surface irradiation of the photovoltaic field according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation.

[0031] Preferably, the first coefficient acquisition module includes a first submodule, a second submodule and a third submodule;

[0032] The first submodule is configured to obtain a first scattering coefficient according to a ratio between the scattering amount of the first inclined surface and the scattering amount of the second inclined surface;

[0033] The second submodule is used to obtain a first direct radiation coefficient according to a ratio between the direct radiation amount of the first inclined surface and the direct radiation amount of the second inclined surface;

[0034] The third submodule is configured to obtain a first reflection coefficient according to a ratio between the first ground reflected radiation and the second ground reflected radiation.

[0035] Preferably, the second coefficient acquisition module includes a fourth submodule, a fifth submodule and a sixth submodule;

[0036] The fourth submodule is used to obtain a second scattering coefficient according to the ratio between the first inclined surface scattering amount and the total inclined radiation amount;

[0037] The fifth submodule is used to obtain a second direct radiation coefficient according to the ratio between the direct radiation of the first inclined surface and the total inclined radiation;

[0038] The sixth submodule is configured to obtain a second reflection coefficient according to a ratio between the first ground reflected radiation and the total inclined radiation.

[0039] Preferably, the calculation module includes a first calculation submodule, a second calculation submodule and a third calculation submodule;

[0040] The first calculation submodule is used to obtain the actual inclined surface scattering amount by multiplying the second scattering amount coefficient by the total inclined radiation amount and dividing it by the first scattering amount coefficient;

[0041] The second calculation submodule is used to calculate the actual direct radiation of the inclined surface by dividing the product of the second direct radiation coefficient and the total inclined radiation by the first direct radiation coefficient;

[0042] The third calculation submodule is configured to obtain actual ground reflected radiation by multiplying the second reflection coefficient by the total inclined radiation and dividing the product by the first reflection coefficient.

[0043] One of the above technical solutions has the following advantages or beneficial effects: Under the premise of not making any engineering changes, this solution temporarily sets up information collection equipment with the same inclination angle, height and other information as the station at the meteorological station, and sets up three meters: inclined surface direct radiation meter, inclined surface scattered radiation meter, and inclined surface ground reflection meter. At the same time, the same collection equipment is set up at the station, and three meters are set up to calculate the correlation coefficients of the irradiation data corresponding to the three meters and the correlation coefficients with the total inclined surface irradiation data directly measured by the meteorological station. After the big data calculation, the equipment is removed, and the total inclined surface irradiation data of the photovoltaic area can be directly calculated using the meteorological station data in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a flow chart of an embodiment of the method of the present invention.

[0045] Figure 2 It is a structural diagram of an embodiment of the system of the present invention. DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention.

[0047] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically specified.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0049] like Figures 1 and 2 As shown, a calculation method for predicting the irradiance component of an inclined surface includes the following steps:

[0050] Obtain temporary data of tripartite radiation at a fixed location and direct radiation of the photovoltaic field;

[0051] obtaining a first correlation coefficient between the temporary data and the direct radiation amount;

[0052] Get the total tilt radiation of the three-way radiation of the weather station;

[0053] obtaining a second correlation coefficient between the temporary data and the total oblique radiation;

[0054] The actual component of the inclined surface irradiation of the photovoltaic field is calculated according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation.

[0055] In the present invention, temporary data on the three-dimensional radiation is obtained at a fixed location. However, due to locational constraints, the oblique radiation component between the fixed location and the photovoltaic power station is different. The fixed location, the photovoltaic field, and the meteorological station are all fixed in position, and a proportional relationship exists between the radiation amounts of the three. This can be achieved by using a first correlation coefficient between the temporary data and the direct radiation amount, and a second correlation coefficient between the temporary data and the total oblique radiation amount. When it is necessary to obtain the actual component of the oblique surface irradiation of the photovoltaic field, the temporary data on the three-dimensional radiation obtained at the fixed location can be reversely inferred using the second correlation coefficient and the total oblique radiation amount. The temporary data on the three-dimensional radiation obtained at the fixed location also has a fixed proportional relationship (the first correlation coefficient) with the direct radiation amount of the photovoltaic field. At this point, reverse inference can be continued using the first correlation coefficient and the inferred temporary data on the three-dimensional radiation at the fixed location to obtain the actual component of the oblique surface irradiation of the photovoltaic field.

[0056] It is worth mentioning that in order to ensure the accuracy of the first correlation coefficient, the inclination angle and height of the tripartite radiation device obtained at a fixed position need to be consistent with those of the photovoltaic field device.

[0057] Without requiring any engineering modifications, this method temporarily sets up data collection equipment at the weather station, using the same inclination angle and height as the station. Three meters are installed: a direct radiation meter for the inclined surface, a scattered radiation meter for the inclined surface, and a ground reflectometer for the inclined surface. Simultaneously, the same data collection equipment is set up at the photovoltaic field, with the three meters. The correlation coefficients of the irradiance data corresponding to the three meters are calculated, as well as the correlation coefficient with the total irradiance data directly measured at the weather station. After the big data calculations are completed, the equipment is removed, and the total irradiance data for the photovoltaic field can be directly inferred using the weather station data. This ensures accuracy while also saving the cost of monitoring equipment.

[0058] Preferably, the temporary data includes the first inclined surface scattered amount, the first inclined surface direct radiation amount and the first ground reflected radiation amount;

[0059] The direct radiation includes the second inclined surface scattered radiation, the second inclined surface direct radiation and the second ground reflected radiation.

[0060] Preferably, the first correlation coefficient includes a first scattering coefficient, a first direct radiation coefficient, and a first reflection coefficient;

[0061] The first scattering coefficient is the ratio between the scattering amount of the first inclined surface and the scattering amount of the second inclined surface;

[0062] The first direct radiation coefficient is the ratio between the direct radiation of the first inclined surface and the direct radiation of the second inclined surface;

[0063] The first reflection coefficient is a ratio of the first ground-reflected radiation to the second ground-reflected radiation.

[0064] The calculation formula of the first scattering coefficient is defined as:

[0065] ;

[0066] The first direct radiation coefficient calculation formula is defined as:

[0067] ;

[0068] The first reflection coefficient calculation formula is defined as:

[0069] ;

[0070] in 、 are the scattering amount of the first inclined surface and the scattering amount of the second inclined surface, 、 are the direct radiation amount of the first inclined surface and the direct radiation amount of the second inclined surface respectively, 、 They are the first ground reflected radiation and the second ground reflected radiation respectively.

[0071] Preferably, the second correlation coefficient comprises a second scattering coefficient, a second direct coefficient and a second reflection coefficient;

[0072] The second scattering coefficient is a ratio between the first inclined surface scattering and the total inclined radiation;

[0073] The second direct coefficient is a ratio between the first inclined surface direct radiation and the total inclined radiation;

[0074] The second reflection coefficient is a ratio between the first ground reflection radiation and the total inclined radiation.

[0075] The second scattering coefficient is defined by the following formula:

[0076] ;

[0077] The second direct coefficient is defined by the following formula:

[0078] ;

[0079] The second reflection coefficient is defined by the following formula:

[0080] ;

[0081] Wherein, the total inclined radiation is defined by the following formula:

[0082] Preferably, the actual component of the inclined surface irradiation comprises an actual inclined surface scattering, an actual inclined surface direct radiation and an actual ground reflection radiation;

[0083] The actual inclined surface scattering is obtained by multiplying the second scattering coefficient and the total inclined radiation, and then dividing the product by the first scattering coefficient;

[0084] The actual inclined surface direct radiation is obtained by multiplying the second direct coefficient and the total inclined radiation, and then dividing the product by the first direct coefficient;

[0085] The actual ground reflection radiation is obtained by multiplying the second reflection coefficient and the total inclined radiation, and then dividing the product by the first reflection coefficient.

[0086] The acquisition of the actual inclined surface scattering is shown as follows:

[0087] ;

[0088] The acquisition of the actual inclined surface direct radiation is shown as follows:

[0089] ;

[0090] ​The actual amount of direct radiation from the inclined surface is obtained as follows:

[0091] .

[0092] A calculation system for predicting irradiance components on an inclined surface, using the calculation method for predicting irradiance components on an inclined surface, comprising a first acquisition module, a second acquisition module, a first coefficient acquisition module, a second coefficient acquisition module, and a calculation module;

[0093] The first acquisition module acquires temporary data of three-way radiation and direct radiation of the photovoltaic field at a fixed position;

[0094] The second acquisition module is used to obtain the total inclined radiation of the three-way radiation of the weather station;

[0095] The first coefficient acquisition module is used to obtain a first correlation coefficient based on temporary data and direct radiation;

[0096] The second coefficient acquisition module is used to obtain a second correlation coefficient based on the temporary data and the total tilt radiation;

[0097] The calculation module is used to calculate the actual component of the inclined surface irradiation of the photovoltaic field according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation.

[0098] Preferably, the first coefficient acquisition module includes a first submodule, a second submodule and a third submodule;

[0099] The first submodule is configured to obtain a first scattering coefficient according to a ratio between the scattering amount of the first inclined surface and the scattering amount of the second inclined surface;

[0100] The second submodule is used to obtain a first direct radiation coefficient according to a ratio between the direct radiation amount of the first inclined surface and the direct radiation amount of the second inclined surface;

[0101] The third submodule is configured to obtain a first reflection coefficient according to a ratio between the first ground reflected radiation and the second ground reflected radiation.

[0102] Preferably, the second coefficient acquisition module includes a fourth submodule, a fifth submodule and a sixth submodule;

[0103] The fourth submodule is used to obtain a second scattering coefficient according to the ratio between the first inclined surface scattering amount and the total inclined radiation amount;

[0104] The fifth submodule is used to obtain a second direct radiation coefficient according to the ratio between the direct radiation of the first inclined surface and the total inclined radiation;

[0105] The sixth submodule is configured to obtain a second reflection coefficient according to a ratio between the first ground reflected radiation and the total inclined radiation.

[0106] Preferably, the calculation module includes a first calculation submodule, a second calculation submodule and a third calculation submodule;

[0107] The first calculation submodule is used to obtain the actual inclined surface scattering amount by multiplying the second scattering amount coefficient by the total inclined radiation amount and dividing it by the first scattering amount coefficient;

[0108] The second calculation submodule is used to calculate the actual direct radiation of the inclined surface by dividing the product of the second direct radiation coefficient and the total inclined radiation by the first direct radiation coefficient;

[0109] The third calculation submodule is configured to obtain actual ground reflected radiation by multiplying the second reflection coefficient by the total inclined radiation and dividing the product by the first reflection coefficient.

[0110] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0111] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A calculation method for predicting the irradiance component of an inclined surface, characterized in that: The following steps are involved: Obtain temporary data of tripartite radiation at a fixed location and direct radiation of the photovoltaic field; obtaining a first correlation coefficient between the temporary data and the direct radiation amount; Get the total tilt radiation of the three-way radiation of the weather station; obtaining a second correlation coefficient between the temporary data and the total oblique radiation; The actual component of the inclined surface irradiation of the photovoltaic field is calculated according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation; The temporary data includes the first inclined surface scattered amount, the first inclined surface direct radiation amount and the first ground reflected radiation amount; The direct radiation includes the second inclined surface scattered radiation, the second inclined surface direct radiation and the second ground reflected radiation; The first correlation coefficient includes a first scattering coefficient, a first direct radiation coefficient, and a first reflection coefficient; The first scattering coefficient is the ratio between the scattering amount of the first inclined surface and the scattering amount of the second inclined surface; The first direct radiation coefficient is the ratio between the direct radiation of the first inclined surface and the direct radiation of the second inclined surface; The first reflection coefficient is the ratio between the first ground reflected radiation and the second ground reflected radiation; The second correlation coefficient includes a second scattering coefficient, a second direct radiation coefficient and a second reflection coefficient; The second scattering coefficient is the ratio between the first inclined surface scattering and the total inclined radiation; The second direct radiation coefficient is the ratio between the direct radiation of the first inclined surface and the total inclined radiation; The second reflection coefficient is the ratio between the first ground reflected radiation and the total inclined radiation; The actual components of inclined surface irradiance include actual inclined surface scattered radiation, actual inclined surface direct radiation and actual ground reflected radiation; The actual inclined surface scattering amount is obtained by multiplying the second scattering amount coefficient and the total inclined radiation amount by the first scattering amount coefficient; The actual direct radiation of the inclined surface is obtained by multiplying the second direct radiation coefficient and the total inclined radiation by the first direct radiation coefficient; The actual ground reflected radiation is obtained by multiplying the second reflection coefficient and the total inclined radiation by the first reflection coefficient.

2. A calculation system for predicting irradiance components on an inclined surface, using the calculation method for predicting irradiance components on an inclined surface according to claim 1, characterized in that: It includes a first acquisition module, a second acquisition module, a first coefficient acquisition module, a second coefficient acquisition module and a calculation module; The first acquisition module acquires temporary data of three-way radiation and direct radiation of the photovoltaic field at a fixed position; The second acquisition module is used to obtain the total inclined radiation of the three-way radiation of the weather station; The first coefficient acquisition module is used to obtain a first correlation coefficient based on temporary data and direct radiation; The second coefficient acquisition module is used to obtain a second correlation coefficient based on the temporary data and the total tilt radiation; The calculation module is used to calculate the actual component of the inclined surface irradiation of the photovoltaic field according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation; The first coefficient acquisition module includes a first submodule, a second submodule and a third submodule; The first submodule is configured to obtain a first scattering coefficient according to a ratio between the scattering amount of the first inclined surface and the scattering amount of the second inclined surface; The second submodule is used to obtain a first direct radiation coefficient according to a ratio between the direct radiation amount of the first inclined surface and the direct radiation amount of the second inclined surface; The third submodule is used to obtain a first reflection coefficient according to a ratio between the first ground reflected radiation and the second ground reflected radiation; The second coefficient acquisition module includes a fourth submodule, a fifth submodule and a sixth submodule; The fourth submodule is used to obtain a second scattering coefficient according to the ratio between the first inclined surface scattering amount and the total inclined radiation amount; The fifth submodule is used to obtain a second direct radiation coefficient according to the ratio between the direct radiation of the first inclined surface and the total inclined radiation; The sixth submodule is used to obtain a second reflection coefficient according to the ratio between the first ground reflected radiation and the total inclined radiation; The calculation module includes a first calculation submodule, a second calculation submodule and a third calculation submodule; The first calculation submodule is used to obtain the actual inclined surface scattering amount by multiplying the second scattering amount coefficient by the total inclined radiation amount and dividing it by the first scattering amount coefficient; The second calculation submodule is used to obtain the actual direct radiation of the inclined surface by multiplying the product of the second direct radiation coefficient and the total inclined radiation by the first direct radiation coefficient; The third calculation submodule is configured to obtain actual ground reflected radiation by multiplying the second reflection coefficient by the total inclined radiation and dividing the product by the first reflection coefficient.

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