Distributed resources and DC distribution system combination for high power quality

This paper presents a DC distribution system supplied by an external AC system as well as local distributed resources (DRs) including distributed generations (DGs) and battery storage bank in order to demonstrate an overall solution to power quality issue. The power flow control in DC distribution system has been achieved by network and storage converters. A suitable control strategy for these converters has been proposed. They have DC voltage droop regulator and novel instantaneous power regulation scheme. Also a new control system has been proposed for DG converters. In this paper, several case studies have been studied based on proposed methods. The simulation results, based on PSCAD/EMTDC software, show that DC distribution systems including DR units can provide the high power quality.