单相光伏并网逆变器的无差拍控制研究

Research on Single-Phase Photovoltaic Grid-Connected Inverter with Deadbeat Control

逆变器是光伏并网发电系统的核心设备之一,为了使光伏系统最大限度地输出高质量的电能,必须对逆变器电流进行快速有效的控制。阐述了光伏并网逆变器工作原理和无差拍电流控制方法,给出了逆变器占空比的计算和参考电流的获取方法,并将无差拍电流控制应用于单相并网逆变器控制中。MATLAB软件仿真表明,无差拍控制方法控制策略简单、有效,使用该控制方法的系统具有良好的稳态和动态特性,并网电流波形好。

Inverter is one of the key equipment in the photovoltaic grid-connected power generation systems. To make the photovoltalc system output the high-quality power energy at its maximum, it is necessary to control the current of the inverter operation fast and effectively. On the Basis of the operation principle of the photovoltaic grid-connected inverter and the deadbeat current control method, the duty cycle calculation, the reference current and the photovoltaic grid-connected inverter with deadbeat control were discussed. MATLAB simulation shows that the deadbeat control strategy is simple and effective, the inverter has better steady and dynamic performance, and the grid-connected current waveform is good.