Optimized Transient Modulation and Control Strategies for Bidirectional Dual-Active-Bridge DC-DC Converters

Both non-resonant and series-resonant dual-active-bridge (DAB) converters are popular for isolated bidirectional dc-dc power-conversion applications, and their optimal dynamic performance is an active research topic. It is found that when the control variables are updated through conventional transient phase-shift modulation, severe transient oscillations and/or dc offsets will be induced in the high-frequency-link currents of DAB converters. This will lead to high current stresses on power devices and introduce excessive time delays between the PWM generator and controller. Consequently, truly optimal dynamic performance cannot be achieved with a high-performance controller alone, and the modulation-induced problems must also be thoroughly investigated. This report focuses on developing sensorless optimized transient phase-shift modulation methods for DABC converters and presents detailed theoretical analyses, mathematical derivations, and real-time closed-loop experimental verifications. The reported findings provide insights on the optimization of the dynamics of DAB converters using advanced and effective transient modulation schemes and controller design.

Jul 21, 2025 10:00 AM — 11:00 AM