Distributed Voltage Control of DC Microgrids

Abstract

This paper presents a distributed, droop-free voltage control of a dc microgrid in grid-connected and isolated mode. The proposed control technique, based on a distributed consensus approach, addresses reliability issues of centralized controllers that are prone to single point failure, while sharing the loads among Distributed Energy Resources (DERs) more effectively than conventional decentralized droop controllers. The distributed control scheme is implemented, demonstrated, and compared with conventional droop control using time-domain simulations for a model of an actual dc microgrid in Xiamen University, China, based on various realistic scenarios.