基于模糊控制的光伏发电MPPT控制方法

MPPT Control Method for Photovoltaic Power Generation Based on Fuzzy Control

为最大限度地提高光伏发电系统中光伏电池的光电转化效率,针对固定步长电导增量MPPT控制方法的缺点,提出了一种基于模糊控制的变步长电导增量MPPT改进算法。分析了光伏电池的特性并建立等效模型,搭建了基于Boost电路的光伏发电系统,根据系统输入输出设计相应的模糊控制规则,选择合适的隶属度函数,实现了最大功率跟踪的优化控制。通过仿真与分析,证明该方法优于传统的固定步长电导增量法,有利于提高控制精度、减小光伏电池输出功率的波动。

In order to maximize the generating efficiency of photovoltaic cells,aiming at the disadvantage of fixed step conductance increment MPPT control method,an improved MPPT algorithm with variable step conductance increment method based on fuzzy control was presented.The characteristics of photovoltaic cells were analyzed and the equivalent model was established,a photovoltaic power generation system based on Boost circuit was built,the fuzzy control rules was designed according to the input and output of the system,the appropriate membership functions were selected,and the optimal control of maximum power tracking was achieved.Through simulation and analysis,it is proved that the method is better than the traditional fixed step conductance increment method.It improves the control precision and reduces the fluctuation of output power of photovoltaic cell.