Multilevel Multiport Converter for Grid-Tied Dc Microgrids with Integrated PV and Storage

This paper presents a multiport solid-state transformer architecture for interfacing both medium voltage and low voltage DC microgrids with the AC grid. The proposed system is based on a double-star chopper cell multilevel converter and integrates distributed photovoltaic generation and battery energy storage at the submodule level. The converter supports both grid-connected and stand-alone operation modes and utilizes internal circulating currents to enable efficient power dispatch among multiple ports. The resulting architecture provides a flexible, scalable, and highefficiency solution for next-generation DC microgrid applications.