Conventionally, multiple Distributed Generation systems operating as a standalone microgrid use droop control concepts to match load demand and share power. However, it is challenging to maintain a high quality microgrid voltage using droop control alone, particularly when nonlinear loads and load transients are considered. Recently, a resonant voltage regulation system integrated with a synchronous reference frame virtual impedance loop and a phase locked loop, has been shown to achieve significantly improved performance both in terms of power sharing and dynamic response. This paper now applies this approach to a single phase microgrid system operating with significant levels of nonlinear loads, showing how similar performance benefits can be achieved in this particularly difficult operating context. The advantages of the approach are shown by detailed simulation and experimental studies across a variety of load conditions.
