中文摘要：

以离网型三相光伏发电系统为研究对象,研究其输出逆变环节的拓扑结构和控制策略。逆变器主电路采用三相半桥拓扑,输出滤波器取三相星形LC结构,控制策略以输出电压峰值作为闭环变量。仿真和实验结果表明,系统三相输出电压变化平滑且稳定对称,其幅值和频率能够准确跟踪其给定值。

英文摘要：

In this paper, three-phase stand-alone photovoltaic generation system was taken as the research object,the output inverter topology and control strategy were investigated. Three-phase half-bridge topology was adopted asthe inverter main circuit, Y connected LC structure was selected in the output filter, and the output voltage peak value was chosen as the closed-loop feedback variable. Simulation and experimental results showed that, the three-phase output voltages varied smoothly, keep stable and balanced, and its amplitude and frequency could track the reference signal accurately.