遮蔽条件下的光伏阵列最大功率点跟踪算法

摘要

针对光伏发电系统在部分遮挡情况下所具有的高度非线性、时变不确定性和多个局部峰值等特点,研究了一种基于改进人工鱼群算法的最大功率点跟踪方法.此方法将人工鱼群算法与扰动观察法相结合,把最大功率点的搜索和跟踪分开进行,充分考虑到两者的相关性和独立性,有效地提高了光伏发电系统的发电效率.通过Matlab仿真实验表明:无论光伏阵列是否存在遮蔽现象,本算法均具有良好的最大功率点搜索和跟踪效果,避免了局部极值点的影响.%The PV arrays is always partially shadowed when it is operated.In this condition the output get more complicated,which became highly nonlinear,time-variable uncertainty and exist multiple peaks.An improved artificial fish swarm algorithm is presented in this paper.The method combined artificial fish swarm algorithm with perturb and observe algorithm,so the maximum power point searching and tracking are separated.Considering both the correlation and independence that effectively improved the generating efficiency of the photovoltaic system.The simulation experiment indicates that no matter the PV arrays is partially shaded or not,the algorithm produces a good effect on searching and tracking the global maximum power point of the PV arrays and avoids falling into the local maxima.