基于模糊逻辑双环控制的光伏发电系统最大功率跟踪算法.PDFVIP

第 38 卷 第 21 期 电力系统保护与控制 Vol.38 No.21 2010 年 11 月 1 日 Power System Protection and Control Nov. 1, 2010 基于模糊逻辑双环控制的光伏发电系统最大功率跟踪算法 苏海滨，王光政，王继东 （华北水利水电学院电力学院，河南 郑州 450011） 摘要：根据光伏阵列非线性伏安特性，提出了基于模糊逻辑双环控制光伏阵列最大功率跟踪算法，使得光伏阵输出功率接近 于理论最大值。系统主要由单相逆变器、控制器和交流水泵机组组成，主控制环实现光伏阵列最大功率跟踪初级模糊控制算 法，输出为最大功率点处电压。该电压作为逆变控制器参考输入电压，内环模糊控制用于控制变频器输出频率，进一步控制 交流水泵机组的输出功率，实现了更高精度的跟踪光伏阵列最大功率点跟踪。实验结果表明，所提出算法能有效提高光伏阵 列的输出效率。 关键词：模糊逻辑；光伏发电；最大功率点 The maximum power point tracking algorithm for photovoltaic power system based on fuzzy logic double loop control SU Hai-bin，WANG Guang-zheng ，WANG Ji-dong （Electric Power School ，North China University of Water Conservancy and Electric Power ，Zhengzhou 450011 ，China ） Abstract ：According to non-linear characteristic of photovoltaic array ，this paper proposes a method of maximum power point tracking algorithm based on fuzzy logic double loop control for photovoltaic power systems, which makes the output power of photovoltaic array approach to the theoretical maximum value ．The system is composed of a simple phase inverter，controller and AC pump unit ．Main controller loop implements primary fuzzy logic controll algorithm of maximum power point tracking ，and it exports a voltage at the maximum power point ．This voltage is imported to inverter controller ．The inner loop fuzzy controller is used in controlling inverter frequency to further controll the output power of AC motor pump and higher precision of maximum power point tracking is realized ．Simulation and experimental results show that the proposed algorithm can effectively improve the efficiency of photovoltaic array output ． Key words ：fuzzy logic ；photovoltaic power ；maximum powe