中文摘要：

讨论了光伏发电系统最大功率跟踪常用控制方法的优缺点,对光伏电池功率电压曲线进行了详细分析,把非对称模糊PID控制应用到光伏发电MPPT控制中,非对称模糊控制能快速响应外界环境的变化,使光伏系统始终工作在最大功率点;同时加入PID控制可以有效消除系统在最大功率点附近的功率振荡现象。Matlab仿真结果表明,与传统方法相比,该方法在外部环境变化时能快速准确地跟踪伏电池的最大功率点,具有良好的动态和稳态性能。

英文摘要：

The advantages and disadvantages of common control methods for photovoltaic power generation system maximum power point tracking（MPPT）are discussed.The voltage curves of photovoltaic cell are analyzed in detail.The asymmetric fuzzy PID control method is used in MPPT control of photovoltaic power generation system.The photovoltaic system can work at the maximum power point because the asymmetric fuzzy control is able to rapidly respond to the variation of external environment.On the base of asymmetric fuzzy control,the added PID control can eliminate the system＇ s power oscillation around maximum power point.Matlab simulation results show that the proposed method can track PV cell MPPT rapidly and accurately when the external environment is changed,and the system has perfect dynamic and steady-state performances.