Dual active bridge (DAB) based DC-DC converters are in high demand for offering quick charging capacity to Electric vehicles (EVs). The conventional technique for DAB is based on single-phase-shift (SPS), though it provides simple control but suffers from high peaking in the inductor current under varying charging rates for EV and dc-link voltage ratio. In this paper, initially the expression for optimal reactive power flow into DAB converter under SPS and dual phase-shift (DPS) control techniques are thoroughly examined. Based on the analytical analysis, an improved dual-phase-shift modulation (IDPSM) method for real and reactive power control through a DAB converter is proposed for varying charging rates of an EV and dc-link voltage ratio. The proposed IDPSM control technique is implemented using the inverse perturb and observe (IPO) method that provides optimum inner phase-shift between the legs of the H-bridge to track minimum reactive power or back power flow into the system. This method automatically adjusts the inner and outer phase shift ratios under different loading conditions. Further, the proposed IDPSM scheme enhances the range of ZVS operation even under light load conditions, which is lacking with the conventional control techniques. The Lyapunov theory used to determine the stability of the DAB DC/DC converter. To validate the proposed control scheme, a detailed simulation is carried out using MATLAB/Simulink with a 2 kW system under varying charging rates of an EV. Further, to support the effectiveness of the proposed scheme, a comparison with different phase shift modulation schemes is also presented. Finally, an experimental prototype for DAB is developed to confirm the feasibility of the control technique. K E Y W O R D Sdual active bridge (DAB), dual-phase-shift (DPS), electric vehicle (EV), improved dualphase-shift modulation (IDPSM), reactive power, single-phase-shift (SPS)

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