A Novel Converter Control Strategy for a DFIM-Based Pumped Storage System in an Islanded Microgrid Under Fault Conditions

As offshore wind power in microgrid has thrived over the years, Doubly-Fed-Induction-Machine (DFIM)-based pumped storage systems have been expected to provide ancillary service for such microgrid. However, the control strategy of a DFIM-based pumped storage system during a fault period has not yet been studied. This paper provides insights into the function of a pumped storage system in microgrid facing potential faulty events. A novel control strategy derived from the electromagnetic transient model of DFIM during a fault period is proposed. The proposed control strategy is accurate and flexible. It considers the relative importance of both the frequency and voltage variation during the fault period. The simulation results in dSPACE Simulator confirm that the proposed control improves the performance of the pumped storage system in microgrid.