Multi-Objective Unified Optimal Control Strategy for DAB Converters with Triple-Phase-Shift Control

Jinhui Zeng, Yao Rao, Zheng Lan, Dong He, Fan Xiao and Bei Liu
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Jinhui Zeng: College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
Yao Rao: College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
Zheng Lan: College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
Dong He: College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China
Fan Xiao: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Bei Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Energies, 2021, vol. 14, issue 20, 1-14

Abstract: To solve the problems of large current stress, difficult soft-switching of all switches, and slow dynamic response of dual active bridge converters, a multi-objective unified optimal control strategy based on triple-phase-shift control was proposed. The forward power flow global modes of triple-phase-shift control were analyzed, and three high-efficiency modes were selected to establish the analytical models of current stress and soft-switching. Combined with these models, the optimal solutions in different modes were derived by using the cost function-optimization equation to overcome the limitation of the Lagrange multiplier method, such that the DAB converter achieved the minimum current stress, and all switches operated in the soft-switching state over the entire power range. At the same time, the virtual power component was introduced in the phase-shift ratio combination, which improved the dynamic response of output voltage under the input voltage or load steps changed by power control. The theoretical analysis and experimental results show that the proposed control strategy can optimize the performance of the DAB converter from three aspects, such as current stress, soft-switching, and dynamic response, which achieves multi-objective optimization of the steady-state and dynamic performance of DAB converters.

Keywords: dual active bridge converter; triple-phase-shift control; current stress; soft-switching; virtual direct power control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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