Decoupling Control Strategy for Input-series-output-parallel Dual Active Bridge Converter Based on Active Disturbance Rejection Control

Distributed control strategy is essential to the input-series-output-parallel (ISOP) dual active bridge (DAB) converter. However, the coupling disturbances are not considered in previous distributed-control strategies. They are potential risks of the converter This paper proposes a decoupling strategy based on active disturbance rejection control (ADRC) for the ISOP DAB converters. The linear extended state observers are used in the voltage control loops to reject the coupling disturbances. The closed-loop analysis shows that the impacts of the observed disturbances are eliminated and the control loops are decoupled. Meanwhile, the center controller is indispensable and ISOP-system stability and flexibility are improved. Finally, experimental results based on a dual-module ISOP DAB converter are presented to verify that the proposed strategy has significant inhibition of voltage oscillation.