A new three-port bidirectional DC/DC converter for hybrid energy storage

According to the characteristics of battery and ultra-capacitor in hybrid energy storage, a novel high-frequency magnetic coupled H bridge-double half bridge three-port BDC which applied in storage battery-ultra capacitor hybrid energy storage system (HESS) is proposed in this paper. Based on the simplified model of the converter, the steady-state model and power model are analyzed as well. Current decoupling control strategy for this new topology is also designed to overcome the problems of non-linear and the coupling between multi-input and multi-output of the three-port converter. Simulation model is built to verify the steady-state of this topology, the decoupling performance and the feasibility of the control strategy.