Performance of a microgrid including photovoltaic and wind generation systems

The microgrid concept encompasses distributed energy resources such as distributed generation (DG), renewable energy sources, distributed energy storage, which can operate at islanded mode or connected to the main grid. The generation mix from the DGs has an important role in satisfactory performance of the microgrid. This paper develops a detailed dynamic model of a nonautonomous microgrid which has distributed generation from photovoltaic (PV), wind, conventional sources, in addition to their electronic circuits and the associated filters. The amount of generation mix for stable performance of the microgrid has been investigated through smallsignal analysis. It has been observed that large penetration of PV and wind can drive the microgrid to the brink of unstable region without adequate control. Nonlinear modeling has been employed to verify the findings.