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<p>To address the issue of excessive current stress in dual-active-bridge (DAB) converters under traditional control methods, an analytical expression for the optimal switching frequency that minimizes current stress over a wide input voltage range is derived by analyzing the operational characteristics of the DAB converter under DPS modulation. Meanwhile, by investigating the methods of PI control, linear active disturbance rejection control, and super-twisting sliding mode control combined with variable-frequency control, a novel LESO+STSMC + VF control strategy is proposed in this paper. This approach effectively reduces current stress while enhancing the dynamic response capability of the DAB converter. Finally, comparative studies conducted through MATLAB simulations and an experimental prototype demonstrate that the proposed method exhibits superior performance and effectiveness compared to traditional PI control methods.</p>

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Variable Frequency Current Stress Optimization Strategy for DAB Converters Based on Linear Extended State Observer and Super-Twisting Sliding Mode Control

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Zhongjian Kang,
  • Dongshun Li,
  • Shuaihua Liu,
  • Shengbo Gao

摘要

To address the issue of excessive current stress in dual-active-bridge (DAB) converters under traditional control methods, an analytical expression for the optimal switching frequency that minimizes current stress over a wide input voltage range is derived by analyzing the operational characteristics of the DAB converter under DPS modulation. Meanwhile, by investigating the methods of PI control, linear active disturbance rejection control, and super-twisting sliding mode control combined with variable-frequency control, a novel LESO+STSMC + VF control strategy is proposed in this paper. This approach effectively reduces current stress while enhancing the dynamic response capability of the DAB converter. Finally, comparative studies conducted through MATLAB simulations and an experimental prototype demonstrate that the proposed method exhibits superior performance and effectiveness compared to traditional PI control methods.