光伏发电系统并网控制策略研究

A Study of the Grid-connection Control Strategy for PV System

逆变器是光伏发电系统的主要核心部件,其并网控制策略在改善系统整体性能、提高太阳能利用率等方面发挥着至关重要的作用。作者以单相全桥逆变器为研究对象,分析了并网控制的工作原理,研究了带与不带电网电压前馈的两种直接电流控制策略。理论分析与实验仿真结果证实,加入电网电压前馈不仅能提高系统的跟踪精度,还能改善系统并网电流的质量。

As the core of PV(Photovoltaic)system,the grid-connection control strategy of inverter plays a vital role in improving overall systemperformance and the utilization rate of solar energy.Based on the single phase full bridge inverter in this paper,this paper analyzes the working principle of the grid-connection control,and studies two kinds of direct current control strategy that with and without the grid voltage feed-forward.Finally,the theoretical analysis and simulation experiments results show that the join grid voltage feed-forward control can effectively improve the tracking accuracy of systemand the quality of gird-connection current.