Centralized DC voltage control for a Multiport converter in distribution grids

Abstract

Power electronics components are becoming essential for smart grids, especially integrating systems such as renewable energies, storage or electric vehicles. Multiport converters are presented as a solution to reduce the cost of installing individual power electronic devices and integrating multiple AC and DC systems. This paper proposes a centralized DC voltage control for non-isolated Multiport converters with a common DC bus. Such control is designed for a proper dynamic response in normal operation and AC fault-ride through capability. The centralized DC voltage control is validated in three- and four-port converters, where AC ports are connected to two feeders of the same distribution AC grid. DC ports are connected to a battery or DC load. Time-domain simulations in Matlab Simulink are used to test the presented control strategy in several case studies.