Date of Award

5-2026

Degree Name

Master of Science in Engineering

Department

Electrical and Computer Engineering

First Advisor

Sandun S. Kuruppu, Ph.D.

Second Advisor

Richard T. Meyer, Ph.D.

Third Advisor

Johnson A. Asumadu, Ph.D.

Keywords

Advance control, auxiliary converter, DAB converter, high frequency transformer, power electronics, transient mitigation

Access Setting

Masters Thesis-Open Access

Abstract

Dual Active Bridge (DAB) converters are widely utilized in applications such as electric vehicles, renewable energy systems, and solid-state transformers due to their high efficiency, galvanic isolation, and bidirectional power transfer capability. However, during rapid load transitions, DAB converters frequently exhibit significant output voltage overshoot and prolonged settling times, which increase device stress and adversely affect system reliability. This thesis proposes an auxiliary-circuit-based transient mitigation method to address these limitations. The auxiliary circuit, implemented as a bidirectional Buck–Boost stage, operates in Boost mode during load step-down events to absorb excess energy and suppress the resulting voltage overshoot. The design of the auxiliary circuit and its control strategies are presented systematically, followed by detailed simulation and experimental evaluations. Simulation results for a 15 kW DAB converter demonstrate that the proposed method effectively reduces voltage overshoot and shortens settling time compared with the conventional DAB topology. Experimental results obtained from a scaled laboratory prototype further validate the approach, showing improved dynamic performance and stable voltage regulation under sudden load variations, with approximately a ∼60% reduction in voltage overshoot.

Download

Share

COinS