阴影遮挡下空间太阳电池串联组件输出特性分析

Analysis of Output Characteristics of Super Cells Serial Module with Partial Shading

考虑雪崩击穿效应,以光伏电池元双二极管模型为基础,建立了适用于分析光伏电池部分被遮光问题的数学仿真模型,并利用户外实验验证了模型的正确性。运用此模型分析了单片空间太阳电池在反向偏压下的输出特性和串联组件在不同阴影遮挡情况下的I-V,P-V特性及输出能力。结果表明,空间太阳电池串联组件从无阴影遮挡到40%阴影遮挡,最大输出功率下降40%。串联组件输出功率随单片空间太阳电池遮挡比例的增大迅速下降;从遮挡1/5片,2/5片到整片被阴影遮挡,相应最大输出功率分别下降7.36%,25.81%与97.94%。

Based on a circuit model of a photovoltaic （PV） cell with an extension term considering avalanche effect, the model of PV module with partial shading is established for the analysis of shadow effect. The validity of the model is verified with outdoor experimental test under real solar radiation condition. The output characteristics of one super cell at reverse bias-voltage, the I-V characteristics, P-V characteristics and yield of the serial module under different shadow block are analyzed by use of the model. The results indicate that the maximum output power drops 40 % when the serial module has 40 % partial shading. The output power of the module declines rapidly with shading increasing of one super cell. The maximum power decrease 7.36 %, 25.81% and 97.94 % respectively when each cell is shaded 1/5, 2/5 and the whole.