Disturbance Compensation-Based Discrete Single-Phase-Shift Control for DAB DC-DC Converter

To improve the dynamic performance of dual-active-bridge (DAB) dc-dc converter, a novel disturbance compensation-based discrete single-phase-shift (DCB-DSPS) control strategy is proposed in this paper. By using two discrete compensated phase-shift ratios
$\Delta d_{\mathrm{H}}$
and
$\Delta d_{\mathrm{L}}$
to compensate the open-loop phase-shift ratio
$d_{\text{ol}}$
of the SPS controlled DAB dc-dc converter, the proposed DCB-DSPS control can achieve accurate and fast adjustment of the output voltage under both input voltage and load step change. The control principle, parameters design and control performances of the proposed DCB-DSPS control strategy are developed. Experimental results of a 96V-48V/210W-50kHz DAB dc-dc converter are presented to validate the proposed DCB-DSPS control method.