阴影遮挡对太阳电池阵发电能力影响的仿真分析

航天器太阳电池阵的在轨发电能力会由于舱体等对太阳光的遮挡而受到影响。文章通过建立太阳电池电路模型,利用Saber仿真平台进行仿真,得到太阳电池单串电路遮挡片数与功率输出的关系曲线,利用MatLab进行了基于每个单串电池电路的遮挡计算,最终计算得到自主飞行阶段的阴影遮挡造成的太阳电池阵功率损失率。比较新计算方法与传统计算方法的计算结果表明,新方法的计算精度更高,尤其是在被遮挡的电池片数量较少时,新方法的优势更加突出。

Simulation of shadowing effects on power generation capacity of solar arrays

The energy system of the Space Station Module is a photovoltaic system. Owing to the shadow produced by the section body and other solar arrays, the power generation capacity of the solar arrays would be affected. The paper sets up a solar cell circuit model, to be used on the Saber simulation platform.With the simulation, the relationship between the number of the shaded cells in a cell circuit and the power output is obtained. The shadow based on each cell circuit is calculated with the MatLab, together with the power loss rate caused by the shadow in the autonomous flight phase. The calculation result indicates that the relative error is greater than 5% between the power loss rate and the average blocking rate, the latter is recognized equal to the power loss rate in the traditional calculation method, so that the estimated impact factor of the shadow on the power generation capacity is small. Whereas the proposed method provides a higher precision, which is most applicable when the number of shaded cells is small.