A Simple and Fast Start-Up Strategy for Dual-Active-Bridge Converters With DC Bias Suppression

作者：Xiaozhe Liu, Zhenbin Zhang, Minghao Han, Zhen Li, Yafei Yin, Zheng Dong, Jinyu Wang · 发表于：IEEE Transactions on Power Electronics · 年份：2023 · DOI：10.1109/tpel.2023.3274393 · 被引用次数：17 · 研究领域：Advanced DC-DC Converters、Microgrid Control and Optimization、Multilevel Inverters and Converters

High-power dual-active-bridge (DAB) converters are widely adopted in dc and hybrid ac–dc microgrids, for whichfast start-up dynamicsof DAB converters is a key requirement. Conventional start-up methods usually require complex operation stages, and a time-consuming parameter-tuning process, resulting in slow dynamics. In this work, we propose a new simple and optimal start-up method for DAB converters. Major contributions lie in three-folds. First, we theoretically analyze the transmission power and the peak inductor current of extended phase-shift modulation. Second, a new Lagrange multiplier method is proposed to solve the optimal phase-shift ratios of the underlying control problem, resulting in very fast control dynamics at maximum power transmission, fully respecting the system permissible current limit. Third, an effective and simple strategy bysolelymanipulating the gate signals in the first switching period is newly proposed to eliminate the magnetic bias. The proposed method avoids complex parameter-tuning procedures. Experimental results demonstrate the effectiveness of the proposed method. Results confirm that with the proposed solution amuch fasterstart-up process with a controllable inductor currentwithoutdc bias is achieved, in comparison with the recently reported start-up methods.