Photovoltaic grid power generation has advantages of high integration,easy use,non - pollution and it is one of the main directions of the photovoltaic development. In this paper,design of single - phase photo-voltaic grid power generation system consists of two - level topological structure,with the level preceding using the Boost dc converter structure and disturbance observation method for maximum power point tracking;the latter class can use full bridge inverter circuit dc inverter for alternating current. Finally,under the environment of MATLAB / Simulink,modeling,simulation and the simulation results basically conform to the requirements.%光伏并网发电具有集成度高、使用方便、清洁无污染等优点，是光伏发展的一个主要方向。设计的单相光伏并网发电系统采用两级式拓扑结构，前级采用 Boost 直流变换器结构，用扰动观测法进行最大功率点跟踪，后级用全桥逆变电路将直流电逆变为交流电。最后，在 MATLAB/ Simulink 环境下建模、仿真，仿真结果基本符合要求。
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