Control of low-inertia AC microgrids

Low-inertia AC microgrids are a collection of heterogeneous renewable-energy resources and energy-storage devices (such as photovoltaic arrays, batteries, fuel cells) that are interfaced to a distribution system through power-electronic inverters. In this work, we focus on islanded microgrids that are controlled and operated independently from the bulk power system. Such systems are envisioned to play a key role in increasing electricity access in unserved (and under served) portions of the world; as well as in applications such as disaster relief. Voltage source inverters play the role of the energy-conversion interface between low-inertia DC-energy resources and the AC electrical network in such systems. (See Fig. 1.)