2026/05/12 by Linxiao Gong, Kehui Zhou, Wei Lv +5
Engineering · #Silicon Carbide Semiconductor Technologies #Advanced Power Amplifier Design #Advanced DC-DC Converters
paper · doi:10.1109/tpel.2026.3692530
Single-stage AC-DC dual active bridge (SSDAB) converters in energy storage microgrids often face overload conditions due to AC load fluctuations, leading to excessive inductor current stress and potential device damage. Existing phase-shift controls optimize current stress but fail to prevent overloads exceeding safe current limits. To resolve this limitation, this paper first investigates the feasibility of increasing output power while maintaining constant current stress via frequency regulation. A novel phase–frequency coordinated control strategy is subsequently proposed, which integrates frequency modulation into both TPS and EPS controls under light- and heavy-load conditions, respectively. This approach extends the overload power range to 3.0 per unit (p.u.) without surpassing safe current stress limits. Such a scheme also features online closed-loop control, smaller RMS current and capacitor ripple current that lowers overload hardware costs. Experimental validation, based on a SSDAB platform with monolithic bidirectional GaN on the AC side, demonstrates that the proposed control extends the achievable overload power capability from 673 W (1.0 p.u) to 2020 W (3.0 p.u.) under safe current limits, while also reducing the maximum temperature of the magnetic components from 53°C to 47°C, outperforming conventional phase-shift controls.