Impacts of Inverter Control Strategies on the Stability of Low-Inertia Power Systems

This work sheds light on low-inertia power system dynamics under mixed-types of inverter control strategies. Specifically, this paper details inverter-dominated microgrid transients including a synchronous generator in parallel with both Grid-Following and Grid-Forming inverter resources. Analyses indicated that Grid-Forming control has a more rapid response than its Grid-Following counterpart, thus together can contribute to a more effective system frequency regulation. The study also documents the impacts of both types’ inverter droop settings and inertia levels on system responses to load switching events, resulting in a practical guidance for utility engineers.