基于重复PI控制的光伏并网逆变器

针对传统PI控制无法实现无静差跟踪的缺点,对逆变器的控制策略进行改进.电压前馈补偿可以抵消电网作用, 使系统近似成为一个简单的无源跟随系统.基于内模原理的改进型重复PI控制策略,对于消除非线性负载及其他周期性干扰引起的波形畸变具有明显的效果.仿真结果表明,并网电流波形良好,并网电流基本与电网电压同频同相,并网的功率因数近似为1,完全满足设计的要求.

Study on Photovoltaic Grid-Connected Inverter Based on Repetitive PI Control

Aiming at solving the disadvantages that traditional PI control can not realize tracking without steady-state error,the paper improved the control strategy of inverter.The feed-forward control of utility grid voltage counteracts the influence of utility grid.The system becomes a simple passive tracking system.The improved repetitive control strategy based on internal model theory PI con-trol strategy has good robustness and has clear effect to eliminate waveform distortion caused by nonlinear load and other...