A Four-Port DC-DC Converter for Hybrid Integration of Fuel Cell-Solar PV with Bipolar DC Microgrid

This article describes a novel non-isolated dual-input dual-output DC-DC converter designed for the hybrid integration of Fuel Cell and Solar PV into bipolar DC microgrid systems, enabling single-stage power conversion. Unlike existing non-isolated multiport DC-DC converters, the proposed design offers significant voltage gain with fewer magnetic components. By employing a set of deduced controllers, the proposed converter effectively regulates both inductor current and output voltage, while its symmetrical output structure naturally balances pole voltages. Additionally, the converter can operate as a single-input-dual-output system if either the Fuel Cell or Solar PV source is unavailable. The paper explores various operating modes and presents steady-state simulation results, highlighting the effectiveness of the proposed circuit.