Randomized Computation for the Current Stress Policy Design in the DAB Converter

This letter addresses the current stress policy design in the Dual-Active-Bridge (DAB) converters with the randomized computation approach. First, a hybrid automaton approach is applied to model the dynamics of the DAB converter. Then the optimal feedback policy of a quadruple-phase-shift is obtained via solving a peak current minimization problem with DAB converter dynamics and transferred power constraints. A randomized optimization approach is applied to solve the problem. The proposed control scheme is validated by numerical simulation and compared with the traditional double-phase-shift and triple-phase-shift policies. The simulation results verify that the proposed quadruple-phase-shift method has better performance regarding the current stress.