Method for calculating irradiation non-uniformity of photovoltaic module under shielding of photovoltaic array interval
A technology of photovoltaic modules and photovoltaic arrays, applied in the direction of complex mathematical operations, etc., can solve problems such as large power grid system frequency and voltage offset, affecting power supply quality and reliability, maximum power tracking point tracking failure, etc.
Active Publication Date: 2018-11-23
深圳珈伟低碳科技有限公司
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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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[0058] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0059] The radiation irradiated on the solar photovoltaic module mainly includes direct radiation, scattering and a small amount of ground reflection radiation. Since the ground reflection radiation accounts for a small proportion, this part of the calculation is ignored in the present invention. Furthermore, in the present invention, it is considered that the direct rays of the sun are parallel to each other.
[0060] The present invention obtains such as by meteonorm software or China Meteorological Data Network figure 1 The average horizontal level total radiation of a city in the past ten years is shown in GH (KWh / m 2 ), diffuse radiation DH (KWh / m2 ) and normal radiation BN (KWh / m 2 ), w...
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The invention discloses a method for calculating irradiation non-uniformity of a photovoltaic module under the shielding of a photovoltaic array interval. According to a solar trace, a time-based change rule of a shielding proportion of a battery in the photovoltaic module is determined; based on a solar scattering irradiation anisotropy model, a relation between the shielding proportion and the non-uniformity is determined; the surface irradiation non-uniformity caused by the front-back-row shielding of the photovoltaic module is quantified; and relation functions between the surface irradiation loss of the photovoltaic module and the solar position and between the surface irradiation loss of the photovoltaic module and the photovoltaic array interval are built. According to the method, the time-based change law of the shielding proportion of the back-row module can be determined more accurately; and the surface irradiation non-uniformity caused by the front-back-row shielding of thephotovoltaic module is quantified, so that reasonable and effective evaluation of the influence caused by the front-back-row shielding can be realized.
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...
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IPC IPC(8): G06F17/10
CPCG06F17/10
Inventor 张臻邵玺罗皓霖祝曾伟宋倩张起源
Owner 深圳珈伟低碳科技有限公司