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