基于变尺度混沌优化搜索的局部阴影条件下光伏阵列MPPT研究

摘要

为提高混沌搜索在局部阴影条件下光伏阵列最大功率点跟踪中的速度和效率,提出一种变尺度混沌优化搜索方法.在搜索过程中首先采用Logistic映射产生混沌变量,将其映射到光伏阵列的输出电压空间;然后进行变尺度操作,将搜索区间缩小,直到搜索到最大功率点.研究结果表明:与传统混沌搜索方法相比,该混沌搜索方法能快速准确地跟踪最大功率点的变化,为局部阴影条件下光伏阵列最大功率点跟踪提供了一种新的有效方法.%To improve the speed and efficiency of chaos search for MPPT of PV array under the condition of partial shading,a novel mutative scale chaos optimization method was proposed.In the process of chaos search,firstly,the Logistic mapping was used as the carrier process to produce the chaos variables,and mapped them to the output voltage space of PV array;then,the mutative scale method was used to decrease the search space of optimized variables,and found the maximum power point eventually.The results show that the proposed method can track the change quickly and accurately,and it provides a new efficient way to track the maximum power point of PV array under partial shading conditions.