新型并网逆变器控制策略比较和数字实现

Comparative Analysis and Digital Implementation of Novel Control Strategies for Grid-Connected Inverters

介绍两种新型PR(P+Resonant)控制策略,实现了并网逆变器输出电流的零稳态误差。通过理论分析对采用更实用的低通式和带通式准PR控制器性能进行了比较研究,并将数字信号处理中IIR数字滤波器的理论应用到控制器的离散化中,实现了控制器性能的优化。仿真分析证明带通式准PR控制策略具有更好的动态性能和抗电网电压干扰能力。1kW实验样机上的实验结果验证了理论和仿真分析的正确性。

Two novel P＋resonant control strategies for grid-connected inverters are presented in the paper, which can achieve zero steady-state error of output current. A more practical low pass mode and a band pass mode quasi-PR controller are used, and their performances are compared based on theoretical analysis. Infinit impulse reponse （IIR） digital filter theory in digital signal processor is introduced to the digital implementation of controllers so as to optimize the performance of controllers. Simulation results demonstrate that band pass mode quasi-PR controller has higher performance in dynamic response and grid voltage disturbance rejection. Experimental results of a lkW experimental prototype verify the validity of the theoretical and simulation analysis.