Triple Phase Shift Modulation-Based Direct Power Control Strategy for a Dual Active Bridge Converter
Gao Yu1, Li Ruoyu1, Li Linzhe1, Xie Xifeng1,2, Shu Zeliang1
1. School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China; 2. Guangxi College of Water Resources and Electric Power Nanning 530023 China
Abstract In order to reduce the current stress and conduction loss of dual active bridge converter (DAB) and improve the efficiency of the converter, this paper proposes an optimal control method based on the inductor current under the mode of triple phase shift (TPS) modulation. Considering the complex optimization issue caused by DAB multi-mode operations in TPS modulation, a symmetric transformation and a space projection method based on an AC equivalent model are used to eliminate redundant feasible regions. Taking the minimum inductive current as the optimization object, this strategy uses the optimality conditions to resolve it. In addition, to improve the dynamic performance, a direct power control strategy (DPC) incorporated with a minimum inductor RMS current model is explored. In the case of input voltage fluctuation and load mutation, the converter can achieve accurate control output without overshoot within a few of duty cycles. Finally, the proposed strategy is verified on a low-power prototype using SiC devices.
Gao Yu,Li Ruoyu,Li Linzhe等. Triple Phase Shift Modulation-Based Direct Power Control Strategy for a Dual Active Bridge Converter[J]. Transactions of China Electrotechnical Society, 2022, 37(18): 4707-4719.
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2022, Vol. 37 
