Three-Port Current Fed Push/Pull Partial Power Converter for Integration of PV/Battery Systems in DC Microgrids

The concept of a partial power converter (PPC) has been widely adopted to replace the full power converter. PPC processes only a fraction of the total power flowing between input and output, or source and load, which results in a very high efficiency and power density. Even though PPC has been used in two-port applications, further research is still required to understand PPC in multi-port applications fully. Thus, the main goal of this paper is to investigate a three-port PPC for integrating photovoltaic (PV)/battery systems in dc microgrids. This work proposes a dual-input single-output (DISO) system that forms the two PPC submodules by connecting a PV and a battery to the dc bus via an individual series port of dc-dc cell. Furthermore, this work provided a cost-effective soft switching solution using a current-fed resonant push-pull configuration in PPC. The suggested PV/battery system based on DISO-PPC architecture is validated using PSIM simulation in conjunction with PV and battery voltage variation, maximum power point tracking, and battery current management.