LCL滤波并网逆变器控制技术综述

并网逆变器是微电网与大电网的接口,控制进网电流质量是系统的关键.LCL滤波器具有良好抑制高频能力,但谐振频率处的谐振峰会导致系统的不稳定.针对LCL滤波器谐振电流控制技术,分析系统谐振的根源;结合典型电流抑制方案介绍控制器设计思想,分析设计方法的利弊.指出并网逆变器研究所面临的问题和未来的研究方向.

An Overview of Technologies for Controlling LCL Grid-Connected Inverters

Grid-connected inverter is an interface between micro-grids and power grids, and the quality of grid current control is the key. LCL filters are highly efficient in suppressing high-frequency, but the problem is that the resonant peak at the resonant frequency can lead to instability of the system. This paper uncovers the reasons for the system resonance for technology of current control with LCL filters; this paper also describes the idea behind the controller design with typical current suppression and studies the advantages and disadvantages of the design. Finally, the problems and future research of grid-connected inverter are pointed out.