中文摘要：

为了促进分布式光伏并网发电系统的发展,进一步提高分布式光伏并网系统的效率的同时保证系统的稳定性,设计了一种单相非隔离两级式光伏并网系统。系统由前后两级变换装置组成,分别完成最大功率点跟踪和电能从直流到交流电的转换。最后通过Simulink仿真表明系统工作稳定,电流THD为1.93%,运行效率达到96.04%,证明了该设计能够满足并网发电要求。

英文摘要：

This paper designs a kind of two-stage non-isolated single-phase photovoltaic grid-connected system.The system consists of two conversion devices,completing the maximum power point tracking and power conversion from DC to AC respectively.Finally Simulink simulation results show that the system is stable,the current THD less to 1.93%,operating efficiency reached to 96.04%.