基于改进型重复PI控制的三相并网逆变器

针对三相大功率并网逆变器在开关频率较低情况下采用传统重复PI控制策略所存在的控制精度问题,提出了一种降低其输出并网电流THD的改进型重复PI控制策略.该策略基于线性插值理论计算出重复控制相位补偿中的分数拍提前,从而实现了电网全周期范围内的任意相位补偿,克服了整数拍相位补偿精度不高的问题,改善了并网电流的波形质量,同时对...

Three-phase Grid-connected Inverter Based on Improved Repeated PI Control

Aiming at the control accuracy problems of the traditional repetitive PI control strategy for the three-phase highpower grid-connected inverter when the switching frequency is low,an improved repetitive PI control strategy that reduces its output grid-connected current THD is proposed in this paper.This strategy is based on linear interpolation theory to calculate the fractional beat advance in repetitive control phase compensation,thereby realizing arbitrary phase compensation within the full cycle of the power grid,overcoming the problem of low integer beat phase compensation accuracy,and improving the gridconnected current waveform.The quality has also played a good role in reducing the size and cost of the LCL filter.Based on the proposed control strategy,this paper uses MATLAB/Simulink simulation platform to model and simulate the system.