Impedance matching based stability criteria for AC microgrids

Stable operation of the electrical system in the context of microgrids is imperative to enable their large scale adoption. Even though many analytical tools used in power systems are readily applicable to microgrids, there are certain aspects that render them inadequate or requiring adaptation. This work evaluates several stability criteria applied to a microgrid environment, which comprises distributed generators and loads operating on a droop-control strategy. Stability criteria based on impedance matching at the point of application is proposed. Analytical and simulation results show stability boundaries that can be used in the grid-tied and islanded cases.