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DC microgrid is an appropriate system to interconnect dc output sources and to supply high quality power. This paper describes a novel dc distribution voltage control for dc microgrid. We assumed two electric double layer capacitor (EDLC) banks connected to a dc grid through dc/dc converters, and each EDLC converter controls dc distribution voltage when the system disconnects from the utility grid (intentional islanding operation). In previous study, gain-scheduling control that changes feedback gain according to the output power was proposed to share the output powers. We propose a new voltage control that combines fuzzy control in addition to the gain-scheduling control in order to manage the stored energy. Simulation results demonstrated the proposed method accomplished the dc voltage regulation control and the energy balancing control simultaneously.
Date of Conference: 12-16 Sept. 2010