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<p>Dual-active-bridge (DAB) converters have been widely adopted in DC microgrids due to their bidirectional power transfer capability and high power density. Under microgrid disturbances, DAB converters with conventional control exhibit poor dynamic performance and disturbance rejection capability. To alleviate this problem, a bandwidth-adaptive linear active disturbance rejection control (BA-LADRC) strategy is proposed in this paper. This strategy takes the converter output voltage error as the reference for bandwidth modulation, and introduces a sigmoid function into the linear active disturbance rejection controller (LADRC) to achieve smooth adjustment of the adaptive bandwidth parameters. A second-order low-pass filter is also incorporated into this strategy to suppress high-frequency error disturbances, improving the dynamic performance and disturbance rejection capability of the DAB converter. Furthermore, the Hurwitz stability criterion is employed to conduct a systematic stability analysis of the system. Finally, an experimental prototype is established. Comparisons among three different control strategies demonstrate that the voltage overshoot is reduced by approximately 56.25% under load step changes compared with the PI strategy, which validates the correctness and feasibility of the proposed scheme.</p>

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Bandwidth-adaptive linear active disturbance rejection control strategy for DAB converters

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Yunya Wu,
  • Yadong Li,
  • Yaming Li,
  • Jiarong Kan,
  • Xiaoyong Zhu,
  • Lei Xu

摘要

Dual-active-bridge (DAB) converters have been widely adopted in DC microgrids due to their bidirectional power transfer capability and high power density. Under microgrid disturbances, DAB converters with conventional control exhibit poor dynamic performance and disturbance rejection capability. To alleviate this problem, a bandwidth-adaptive linear active disturbance rejection control (BA-LADRC) strategy is proposed in this paper. This strategy takes the converter output voltage error as the reference for bandwidth modulation, and introduces a sigmoid function into the linear active disturbance rejection controller (LADRC) to achieve smooth adjustment of the adaptive bandwidth parameters. A second-order low-pass filter is also incorporated into this strategy to suppress high-frequency error disturbances, improving the dynamic performance and disturbance rejection capability of the DAB converter. Furthermore, the Hurwitz stability criterion is employed to conduct a systematic stability analysis of the system. Finally, an experimental prototype is established. Comparisons among three different control strategies demonstrate that the voltage overshoot is reduced by approximately 56.25% under load step changes compared with the PI strategy, which validates the correctness and feasibility of the proposed scheme.