Decoupling Control of Input-Paralleled System with Dual Active Bridge Converters

This paper proposes a new control strategy for DC-DC converter systems consisting of multiple dual active bridge (DAB) modules. At first, the relations between input current sharing control and output voltage regulation (OVR) in input-paralleled systems are investigated, which is based on small signal model. Then, an input current sharing (ICS) control loop is designed, which is decoupled with the OVR control loop. In the proposed method, the model of the modular converter is simplified, in which a decoupling control scheme is easily derived. In addition, the modeling technique is applied not only to the input-parallel output-parallel (IPOP) system but also to the input-series output-series (IPOS) system. The effectiveness of the proposed control strategy has been verified by simulation results for a 30-kW system.