光伏电池电路理论模型在工程应用中的计算方法

Calculation method of solar cells model in engineering applications based on circuit theory

为了更全面、更准确地反映光伏电池的输出特性,解决工程计算模型精度不高等问题,介绍了一种基于光伏电池实际等效电路的理论模型的参数计算方法.该计算方法使用的模型区别于工程计算模型,即考虑光伏电池实际等效电路模型中各个参数,如电池内部等效串并联电阻对输出特性的影响.通过对比2种不同模型在不同工况条件下的仿真结果得出,光照强度的改变对基于电路理论模型得到的开路电压和最大功率点影响相对较小.实际等效电路理论模型在反映不同工况条件下光伏电池输出特性时,都优于工程计算模型,得出的曲线精度更高,更符合光伏电池特性的理论分析结果.

Abstract ： In order to obtain a better reflection about the output characteristics of solar cells and solve the problem of the engineering model that is imprecise, a calculation method is presented based on the actual equivalent circuit model of solar cells. Unlike the method based on the engineering model, this calculation method considers the impact of various parameters in the actual circuit, such as para sitic series and shunt resistance. By comparing the simulation results of the two different models un der different working conditions, it can be clearly seen that light intensity changes have little effect on the opencircuit voltage and maximum power point which are obtained by the actual equivalent model. The model based on the actual circuit is much better than the engineering calculation model in reflecting the output characteristics of solar cells under different conditions. The simulation results of the model based on the actual circuit are much more in line with the results of theoretical analysis than those of the engineering calculation model.