该文对青海大学50 kW多功能光伏电站进行板面积灰采样,并利用X射线荧光分析技术对积灰进行元素分析,并依此求解积灰试样在0.3~0.7 μm波长范围内的等效折射率与吸收系数。根据有效介质理论将光伏组件表面的积灰等效为连续均匀的介质层,通过分析太阳光束在积灰组件各结构层的传输,确定了积灰对入射光的吸收、反射及透射情况。研究表明:积灰对入射光的吸收作用远大于反射作用,组件透射性能降低主要是积灰对光的吸收导致的。在积灰玻璃透射率试验中,测量值与计算值的绝对误差在0.002~0.087之间,表明模型对积灰组件有较好的实用价值。
Abstract
In this paper, the dust samples were collected from the 50 kW multi-function photovoltaic power station at Qinghai University. The elemental analysis of dust samples was tested by using X-ray fluorescence technology, and the refractive index and absorption coefficient of dust samples were calculated in the wavelength range of 0.3-0.7 μm. According to the effective medium theory, the accumulated dust on the surface of PV modules is equivalent to a continuous and uniform medium layer. The absorptance, reflectance and transmittance of the incident light are calculated by analyzing the transmission of solar beam in each layer of the module. The results show that the absorption effect of the accumulated dust is much greater than its reflection effect for incident light, and the reduction of transmission performance of the PV modules is primarily caused by the absorption of the dust to incident light. In the test of the transmittance of the accumulated dust glass, the absolute error value between the measured value and the calculated value is from 0.002 to 0.087, indicating that the model has great practical application value for the PV modules with accumulated dust.
关键词
光伏组件 /
太阳辐射 /
透光率 /
积灰特性 /
有效介质理论
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