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Method for inverting surface solar total radiation and direct radiation based on wind cloud No.4 satellite

A technology of total solar radiation and solar radiation, applied in complex mathematical operations, etc., can solve the problems of correction of direct radiation inversion effect, less observation data, etc., and achieve the effect of remarkable inversion effect, high accuracy, and less parameters required.

Active Publication Date: 2021-03-26
NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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Problems solved by technology

However, its method of calculating surface radiation is mostly calculated by ESRA, without combining McClear data, and due to the lack of observational data, the inversion effect of direct radiation has not been corrected

Method used

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  • Method for inverting surface solar total radiation and direct radiation based on wind cloud No.4 satellite
  • Method for inverting surface solar total radiation and direct radiation based on wind cloud No.4 satellite
  • Method for inverting surface solar total radiation and direct radiation based on wind cloud No.4 satellite

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Embodiment Construction

[0035] Such as figure 1 As shown, the method of retrieving the surface total solar radiation and direct radiation based on the FY-4 satellite includes the following steps:

[0036] (1) Select the Fengyun-4 satellite image, classify, identify and process the satellite cloud image, convert the pixel image into a cloud index pixel image, and use the Heliosat-2 method to calculate the cloud index on a monthly basis , and then get the clear sky index k . The specific process is as follows:

[0037] n is the result of comparing what the sensor sees on the pixel to what it should see (if the sky is clear), which is related to the "sharpness" of the atmosphere.

[0038] cloud index is the instant t and the pixel point The cloud index of is unitless; its value is obtained by the following equation:

[0039] ;

[0040] In the formula: is the albedo of cloud surface observed by Fengyun satellite sensor at time t, unitless; is the surface albedo under clear sky conditions...

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Abstract

The invention relates to a method for inverting surface solar total radiation and direct radiation based on a wind cloud No.4 satellite, and the method comprises the following steps: (1), selecting awind cloud No.4 satellite image, carrying out the classification, recognition and processing of a satellite cloud chart, converting a pixel image into a pixel image of a cloud index, and respectivelycalculating a cloud index through employing a Heliosat-2 method in a month unit, and further obtaining a clear sky index Kc; (2), utilizing McClear data, and then respectively calculating an earth surface total radiation numerical value GHI and a direct solar radiation DNI; (3), optimizing the direct solar radiation DNI according to the following formula based on the change rule that the direct radiation inversion value is smaller than the observed value in half a year in winter to obtain a direct solar radiation optimized value; and (4), performing evaluating according to the surface total radiation numerical value GHI and the direct solar radiation optimization value, and analyzing the change characteristics of the direct solar radiation optimization value. The method is simple in calculation and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of surface solar radiation inversion, in particular to a method for inverting surface total solar radiation and direct radiation based on the Fengyun-4 satellite. Background technique [0002] In 2019, although China's newly installed photovoltaic grid-connected capacity declined again year-on-year, its new photovoltaic grid-connected capacity and cumulative photovoltaic grid-connected capacity still rank first in the world. However, there are still some obstacles to the development of the photovoltaic industry, one of which is the lack of accurate prediction of the output power of photovoltaic grid-connected systems. The output power of photovoltaic power plants is large, the output fluctuates greatly, and the interval time is large. Therefore, it poses a huge challenge to the management and coordination of large-scale photovoltaic grid-connected safe operation. The accurate prediction of photovoltaic powe...

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Application Information

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IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 杨丽薇高晓清蒋俊霞
Owner NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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