Partly-isolated four-port converter based on bidirectional full-bridge DC/DC converter

According to the analysis of the traditional multiport converter, a novel partly-isolated four-port converter topology is proposed. The proposed converter is combined by two boost converters and a bidirectional full-bridge DC/DC converter, which can realize bi-directional transfer of energy and isolated between ports, and it ensures the stability of photovoltaic power with a lithium battery energy storage system. Then the control strategies of proposed converter under different working modes are analyzed. Finally, the simulation of operating modes and the conversion between the modes are carried out to verify the feasibility of the new four-port converter.