A Dual Input Bipolar Symmetrical Output DC-DC Converter with Improved Voltage Gain

Abstract

The article explores a novel multi-port converter specifically designed for interfacing Solar PV and battery systems to bipolar load setups, consolidating power transfer within a single stage. The proposed converter demonstrates an improved voltage gain compared to contemporary non-isolated multi-input DC-DC converters, while exhibiting more lenient port voltage constraints, thereby enhancing the system's overall operational flexibility. Capable of executing as a single-input-triple-output, dual-input-dual-output, or single-input-dual-output system, the introduced converter adapts to the dynamic energy interactions between the source and the load. Furthermore, the converter achieves current control for the PV source and inherently balances both pole voltages using a simplified control strategy due to its consistent dynamic model. The article delves into various operational modes and presents steady-state and dynamic simulation results, highlighting the efficacy of the proposed circuit. © 2024 IEEE.