Calculation method and system for predicting irradiation component of inclined plane

Abstract

The invention discloses a calculation method and system for predicting an inclined plane irradiation component. The calculation method comprises the following steps: acquiring temporary data of three-direction radiation quantity and direct radiation quantity of a photovoltaic field at a fixed position; acquiring a first correlation coefficient between the first temporary data and the direct radiation quantity; obtaining the total inclined radiation quantity of the three-direction radiation quantity of the meteorological station; acquiring a second correlation coefficient between the temporary data and the total inclined radiation quantity; and according to the first correlation coefficient, the second correlation coefficient and the total inclined radiation quantity, calculating to obtain an actual component of inclined plane irradiation of the photovoltaic field. According to the scheme, on the premise that engineering modification is not carried out, acquisition equipment with the same inclination angle, height and other information as the station is temporarily arranged in the meteorological station, the equipment is removed after big data calculation, and the total irradiation data of the inclined plane of the photovoltaic area can be calculated by directly utilizing the data of the meteorological station in the later period.

Description

Technical Field

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

[0002] Horizontal and inclined surface irradiance play an important role in each system of a photovoltaic power station. Inclined surface irradiance consists of three components: direct irradiance on the inclined surface, scattered irradiance on the inclined surface, and reflected irradiance on the inclined surface. Considering the cost and the productization of meteorological observation equipment, photovoltaic power stations do not have three meters: direct irradiance meter on the inclined surface, scattered irradiance meter on the inclined surface, and reflected irradiance meter on the inclined surface. Usually, there are only total irradiance meters on the inclined surface, total irradiance meters on the horizontal surface, and scattered irradiance meters on the 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 values ​​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 components, consistent height, and consistent environment. As a result, the directly monitored inclined surface irradiation data is significantly different 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 components, and will have a great impact on various systems that require inclined surface irradiation as a basis. Summary of the invention

[0004] In view of 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 irradiation 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] Acquiring a first correlation coefficient between the first 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 tilted 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 scattering 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 of the first inclined surface and the scattering 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 between the first ground reflected radiation and 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 product of the second direct radiation coefficient and the total inclined radiation by the first direct radiation coefficient;

[0024] The actual inclined surface direct 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 irradiation components of inclined surfaces, using the calculation method for predicting irradiation components of inclined surfaces, 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 acquire a first correlation coefficient according to the first temporary data and the direct radiation amount;

[0029] The second coefficient acquisition module is used to acquire a second correlation coefficient according to 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 used to obtain a first scattering amount coefficient according to a ratio between a scattering amount of the first inclined surface and a 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 of the first inclined surface and the direct radiation of the second inclined surface;

[0034] The third submodule is used to obtain a first reflection coefficient by calculating the 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 amount 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 used to obtain the second reflection coefficient according to the second reflection coefficient being the ratio of the first ground reflected radiation to 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 dividing the product of the second scattering amount coefficient and the total inclined radiation amount by the first scattering amount coefficient;

[0041] The second calculation submodule is used to obtain the actual inclined surface direct radiation by multiplying 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 used to obtain the actual inclined surface direct radiation by dividing the product of the second reflection coefficient and the total inclined radiation 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 at the meteorological station information collection equipment with the same inclination angle, height and other information as the station, sets up three meters: inclined surface direct radiation meter, inclined surface scattering 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 schematic diagram of the structure of an embodiment of the system of the present invention. DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below, and 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 from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood 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 are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

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

[0051] Acquiring a first correlation coefficient between the first 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 tilted 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 of three-way radiation is obtained in a fixed position, and due to the relationship between the position, the oblique radiation component between the fixed position and the photovoltaic power station is different, and the positions between the fixed position, the photovoltaic field and the meteorological station are fixed, and there is a proportional relationship between the radiation of the three. For this purpose, the first correlation coefficient between the first temporary data and the direct radiation and the second correlation coefficient between the temporary data and the total oblique radiation can be used. When it is necessary to obtain the actual component of the inclined surface irradiation of the photovoltaic field, the temporary data of the three-way radiation obtained at the fixed position can be reversely inferred through the second correlation coefficient and the total oblique radiation, and there is also a fixed proportional relationship (first correlation coefficient) between the temporary data of the three-way radiation obtained at the fixed position and the direct radiation of the photovoltaic field. At this time, the first correlation coefficient and the reversed temporary data of the three-way radiation at the fixed position can be used to continue to reversely infer, so as to obtain the actual component of the inclined 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 the device of the photovoltaic field.

[0057] Under the premise of no need for engineering modification, the present invention temporarily sets up a collection device with the same inclination angle, height and other information as the station at the meteorological station, sets up three meters: the inclined surface direct meter, the inclined surface scattered meter and the inclined surface ground reflection meter, and sets up the same collection device at the photovoltaic field at the same time, sets up three meters, calculates the correlation coefficient of the irradiation data corresponding to the three meters and the correlation coefficient of the total irradiation data of the inclined surface directly measured by the meteorological station, and removes the equipment after the big data calculation, and later directly uses the meteorological station data to infer the total irradiation data of the photovoltaic area. While ensuring accuracy, it can also save the cost of monitoring equipment.

[0058] Preferably, the temporary data includes the first inclined surface scattering 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 of the first inclined surface and the scattering 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 between the first ground reflected radiation and 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] Among them I dt-P ,I dt-P′ are the scattering amount of the first inclined surface and the scattering amount of the second inclined surface, I bt-P ,I bt-P′ are the direct radiation of the first inclined surface and the direct radiation of the second inclined surface, I rt-P ,I rt-P′ They are the first ground reflected radiation and the second ground reflected radiation respectively.

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

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

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

[0074] The second reflection coefficient is the ratio of the first ground reflected radiation to the total inclined radiation.

[0075] The calculation formula of the second scattering coefficient is defined as:

[0076]

[0077] The second direct radiation coefficient calculation formula is defined as:

[0078]

[0079] The second reflection coefficient calculation formula is defined as:

[0080]

[0081] Among them I t is the total oblique radiation;

[0082] 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;

[0083] 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;

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

[0085] The actual inclined surface direct radiation is obtained by multiplying the second reflection coefficient and the total inclined radiation by the first reflection coefficient.

[0086] The actual inclined surface scattering amount is obtained as follows:

[0087]

[0088] The actual amount of direct radiation from the inclined surface is obtained 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 irradiation components of inclined surfaces, using the calculation method for predicting irradiation components of inclined surfaces, 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 acquire a first correlation coefficient according to the first temporary data and the direct radiation amount;

[0096] The second coefficient acquisition module is used to acquire a second correlation coefficient according to 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 used to obtain a first scattering amount coefficient according to a ratio between a scattering amount of the first inclined surface and a 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 of the first inclined surface and the direct radiation of the second inclined surface;

[0101] The third submodule is used to obtain a first reflection coefficient by calculating the 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 amount 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 used to obtain the second reflection coefficient according to the second reflection coefficient being the ratio of the first ground reflected radiation to 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 dividing the product of the second scattering amount coefficient and the total inclined radiation amount by the first scattering amount coefficient;

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

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the 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 present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A calculation method for predicting the irradiation 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; Acquiring a first correlation coefficient between the first 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 tilted 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.

2. A calculation method for predicting the irradiation component of an inclined surface according to claim 1, characterized in that: The temporary data includes the first inclined surface scattering 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.

3. A calculation method for predicting the irradiation component of an inclined surface according to claim 2, characterized in that: The first correlation coefficient includes a first scattering quantity coefficient, a first direct radiation quantity coefficient and a first reflection quantity coefficient; The first scattering coefficient is the ratio between the scattering of the first inclined surface and the scattering 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 a ratio between the first ground reflected radiation and the second ground reflected radiation.

4. A calculation method for predicting the irradiation component of an inclined surface according to claim 3, characterized in that: 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 of the first ground reflected radiation to the total inclined radiation.

5. A calculation method for predicting the irradiation component of an inclined surface according to claim 4, characterized in that: The actual components of inclined surface irradiance include actual inclined surface scattering, 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 product of the second direct radiation coefficient and the total inclined radiation by the first direct radiation coefficient; The actual inclined surface direct radiation is obtained by multiplying the second reflection coefficient and the total inclined radiation by the first reflection coefficient.

6. A calculation system for predicting irradiation components on inclined surfaces, using a calculation method for predicting irradiation components on inclined surfaces as claimed in any one of claims 1 to 5, 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 acquire a first correlation coefficient according to the first temporary data and the direct radiation amount; The second coefficient acquisition module is used to acquire a second correlation coefficient according to 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.

7. A calculation system for predicting irradiation components of inclined surfaces according to claim 6, characterized in that: The first coefficient acquisition module includes a first submodule, a second submodule and a third submodule; The first submodule is used to obtain a first scattering amount coefficient according to a ratio between a scattering amount of the first inclined surface and a 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 of the first inclined surface and the direct radiation of the second inclined surface; The third submodule is used to obtain a first reflection coefficient by calculating the ratio between the first ground reflected radiation and the second ground reflected radiation.

8. The calculation system for predicting the irradiation component of an inclined surface according to claim 7, characterized in that: 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 amount 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 the second reflection coefficient according to the second reflection coefficient being the ratio of the first ground reflected radiation to the total inclined radiation.

9. The calculation system for predicting the irradiation component of an inclined surface according to claim 8, characterized in that: 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 dividing the product of the second scattering amount coefficient and the total inclined radiation amount by the first scattering amount coefficient; The second calculation submodule is used to obtain the actual inclined surface direct radiation 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 used to obtain the actual inclined surface direct radiation by dividing the product of the second reflection coefficient and the total inclined radiation by the first reflection coefficient.

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