光伏方阵的四层级结构建模与仿真分析

Four hierarchical structure modeling and simulation analysis of photovoltaic arrays

由于受到组件性能差异和天气环境等诸多因素的综合影响,光伏电站直流侧的功率预测技术一直是一个难点和重要的研究方向。提出了一种光伏方阵的四层级建模方法,可以研究任意位置上由于气象因素导致的电池性能偏差对于整个方阵输出功率的影响。同时还考虑了组件内外电气保护的作用,使得功率预测结果更加贴近电站的实际情况。利用该方法,研究比较了一个50 kW光伏方阵在相同遮挡条件下,组件安装方向差异对于整体发电量的影响。

The power prediction technology in DC side of photovoltaic power stations has always been a difficulty, since it can be synthetically affected by weather conditions and many other factors. A four hierarchical modeling method was proposed to be used to study the influence of meteorology-induced performance deviation at any position on the total output power of the PV arrays. The effects of electrical protection inside and outside the photovoltaic modules were considered to minimize the difference between the predicted results and the exact values in actual photovoltaic power stations. Using this method, the influence of the module mounting directions on the total generation capacity was studied for a 50 kW photovoltaic array under the same shading conditions.