Calculation Method of Irradiance Non-uniformity of Photovoltaic Modules Under the Shade of Photovoltaic Square Space

Abstract

The invention discloses a method for calculating the irradiance non-uniformity of photovoltaic modules under the shading of the spacing of photovoltaic square arrays. According to the solar trajectory, the shading ratio of cells in the photovoltaic modules changes with time, and based on the anisotropy model of solar scattering radiation, the shading is determined. The relationship between proportion and unevenness, quantify the unevenness of surface irradiation caused by the shading of the front and rear rows of photovoltaic modules, and establish the relationship function between the surface irradiation loss of photovoltaic modules and the sun position and the distance between photovoltaic square arrays. The invention can more accurately determine the time-varying rule of the shading ratio of the rear row of modules, quantify the unevenness of surface irradiation caused by the shading of the front and rear rows of photovoltaic modules, and realize a reasonable and effective evaluation of the impact of the front and rear rows of shading.

Description

technical field [0001] The invention relates to a method for calculating the non-uniformity of irradiation of a photovoltaic module under the shading of the spacing of the photovoltaic square array, and belongs to the technical field of reliability analysis of the photovoltaic module. Background technique [0002] In recent years, the solar photovoltaic industry has developed rapidly, and the actual power generation performance of photovoltaic modules has also attracted much attention. When designing a photovoltaic system, factors such as land area cost and power generation performance need to be considered comprehensively. The shading between photovoltaic system components is one of the important factors affecting the performance of photovoltaic power generation. The front row of components blocks the incident solar radiation, resulting in a decrease in the effective area irradiated on the panel, resulting in uneven solar radiation, and resulting in the output volt-ampere o...

AI Technical Summary

Problems solved by technology

The shading between photovoltaic system components is one of the important factors affecting the performance of photovoltaic power generation. The front row of components blocks the incident solar radiation, resulting in a decrease in the effective area irradiated on the panel, resulting in uneven solar radiation, and resulting in the output volt-ampere of the components. The characteristic curve is stepped, resulting in multiple local maximum peaks in the power voltage curve, resulting in failure of the maximum power tracking point tracking

In addition, when the penetration rate of photovoltaics in the power grid is high, if large-scale shading occurs, there will be a large gap in the output power, which will lead to deviations in the frequency and voltage of the large power grid system, causing difficulties in dispatching and operation, and ultimately affecting the quality of power supply and power supply reliability

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