Review and comparative analysis of dual active bridge isolated DC to DC converter with different control techniques

Abstract

Bidirectional energy transfer capability is the central part of a lot of modern power conversion systems. Preferably, for reduction of size, weight and cost, these systems use a single high efficiency power electronic conversion system. A dual active bridge converter having two DC-AC converters connected back to back through an AC inductor/transformer is a common topology used for obtaining high efficiency bidirectional power conversion. Some characteristic features of the DAB converter topology are bidirectional power flow capability, inherent soft switching, high power density, high efficiency, galvanic isolation and low number of passive components. In this paper, circuit operation, design, and comparison of efficiency, switch stress, and closed-loop operation of a dual active bridge (DAB) converter for step load variations are discussed and simulated, dual active bridge converter is simulated with closed-loop controller and efficiency is obtained in simulation. Also, switch stress is calculated in simulations. Various control strategies like single phase shift, dual phase shift, extended phase shift and triple phase shift are compared and respective waveforms are shown. Dual active bridge is simulated in MATLAB in single phase shift, extended phase shift, dual phase shift and triple phase shift modes and waveforms are obtained via simulations.