Topology, Modulation and Control Strategy of a Multi-port DC/DC Converter based on Modular Multilevel Converter

Abstract

With the increasing demand of electricity, AC and DC hybrid distribution network comes to be an effective solution in the near future. In the DC power transmission and distribution system, DC/DC converter is required for the interconnection of HVDC, MVDC and LVDC grids. Recent researches focus on face-to-face DC/DC converters based on cascaded DAB and MMC topology. This paper proposes a multi-port MMC based DC/DC converter topology, which is suitable for interconnection of DC grids with different voltage levels. The corresponding modulation and control strategy of this converter, which can transform the DC voltage at DC sides of the converter, are illustrated. Simulation and experimental results validates the modulation and control strategy of the proposed multi-port DC/DC converter topology.