跟网型和构网型逆变器的阻抗无源化方法综述

An Overview of Impedance Passivation Methods for Grid-following and Grid-forming Inverters

相比传统同步机主导的电力系统,由并网逆变器所主导的新能源并网发电系统动态特性发生了根本性变化。近年,国内外报道了多次新能源并网发电系统振荡事件,振荡现象具有宽频域特征,动态行为具有非线性、时变性和复杂性。并网逆变器的端口阻抗无源性是保证并网发电系统稳定的充分条件,适用于复杂电网下的稳定性优化。文中针对跟网型和构网型逆变器,分别从控制器优化设计、串并联虚拟阻抗和其他无源化方法这三个方面,对两类逆变器的中高频阻抗无源化改善方法进行了总结和梳理,最后探讨了当前研究的不足与现存的挑战。

Compared with the conventional power system dominated by the synchronous generators,the renewable-based power system is dominated by the grid-connected inverters and features different dynamics.In recent years,a number of unidentified instability incidents have been frequently reported.The oscillation phenomena arise over a wide frequency range,with the non-linear,time-variant,and complicated dynamics.From the aspects of controller optimization,virtual impedance shaping,and other passivation methods,this paper overviews the impedance passivation methods for grid-following and grid-forming inverters,and summarizes the remaining challenges.