Robust control method to improve microgrid frequency stability in islanded operation

Abstract

Islanded microgrids have low inertia due to their small size as well as integration of inverter-based renewable energy resources. Hence frequency stability is one main concern regarding their operation. Load step pre-announcement and a bang–bang controller were proposed and applied in a test islanded microgrid, consisting of a conventional generator, a photovoltaic (PV) generator and a lumped load, to improve the frequency response. In this study, a possible control architecture for the proposed method is illustrated. A sensitivity analysis is conducted to determine the influence of two parameters, preset and total time, on the performance of the proposed control method. Furthermore, the effectiveness of the implementation of load step pre-announcement and bang–bang controller in the test microgrid with different shares of PV is evaluated through simulation results.