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CHEN Caixue,LIU Xu,DENG Cheng.Research on Current Stress Minimization Strategy for Dual Active Bridge Wide Gain Range[J].JOURNAL OF POWER SUPPLY,2020,18(3):63-70
Research on Current Stress Minimization Strategy for Dual Active Bridge Wide Gain Range
Received:December 31, 2019  Revised:May 07, 2020
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DOI:10.13234/j.issn.2095-2805.2020.3.63
Keywords:dual active bridge(DAB)  current stress  grey wolf algorithm  wide gain range
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CHEN Caixue Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan University, Xiangtan , China
LIU Xu Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan University, Xiangtan , China
DENG Cheng Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology, Xiangtan University, Xiangtan , China
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Abstract:
      When the primary- and secondary-side voltages of a dual active bridge(DAB) DC-DC converter transformer do not match, the current stress therein will increase sharply. To solve this problem, a minimum current stress control strategy is proposed based on an improved grey wolf optimization(GWO) algorithm, which minimizes the current stress of the DAB in a wide gain range. First, the mathematical model of a DAB high-frequency link is deduced in detail based on analyzing the physical model on both sides of the leakage inductance of the DAB DC-DC converter. In this way, solving the current stress is transformed into a multi-dimensional nonlinear constrained mathematical optimization problem. Then, the improved GWO algorithm is proposed to find the global optimal solution of the above problems. Finally, the correctness and validity of the proposed control strategy were verified by simulations in a contrast experiment and a dynamic experiment in comparison with three conventional control strategies.
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