Steady-State Analysis of Dual Active Bridge Converter with Single Phase Shift and Dual Phase Shift Modulation

In recent times, dual active bridge (DAB) converter topology has gained significant limelight as a power conditioning unit, especially for electric vehicle (EV) charging infrastructure and DC microgrids. This is mainly due to added advantage offered by DAB with respect to other converters i.e. isolated DC- DC power conversion along with bidirectional power flow capability. The power flow control using a DAB converter for any application is primarily dictated by the understanding of state-of-art of modulation strategies. In this context, this article illustrates the analysis of the converter at steady-state for single-phase shift (SPS) and dual-phase shift (DPS) modulation techniques. The phase displacement/shift patterns and their correlation with different electrical parameters are represented analytically as well as graphically. Open-loop simulation results for both strategies are showcased for a 1 k W, 48 V /300 V system in boost mode of operation. The nature of all the voltage and current waveforms presented are matching with the results available in previous literature. The system can be further investigated for closed-loop operation in microgrid and EV applications having bidirectional power flow capability.