Frequency dependent DC voltage droop control for hybrid energy storage in DC microgrids

Abstract

A frequency-dependent DC voltage droop control is proposed for hybrid energy storage systems in a DC microgrid. Only local DC voltage measurement is required to realize coordination of resources with different discharge time. Stability analysis and controller optimization are studied to design the proposed controller. Example simulation results for a DC diesel-electric ship are shown. Results show promising performance of the proposed hybrid energy storage control strategy.