本文首先分别从光伏电池特性、Buck电路基本原理，最大功率跟踪方法、PI补偿、PWM调制等方面分别进行分析设计，最后利用Simulink对光伏发电系统进行了仿真，并对其进行最大功率跟踪。-Firstly separately　the PV cell characteristics, Buck circuit basic principle, the maximum power point tracking method, PI compensation, PWM modulation and other aspects of analysis and design, respectively, and finally the use of Simulink for photovoltaic power generation system is simulated, and its maximum power point tracking.