Centralized DC voltage control for a Multiport converter in distribution grids

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. • A flexible control of the Multiport converter is presented for N ports. • Accurate DC bus voltage regulation improves droop control without communications. • Robust control for a Multiport converter for any type and location of AC faults. • A linear model with H-inf norm is used to design control for a Multiport converter.