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Three-phase dual active bridge (DAB3) converters are considered as a favorable choice in dc microgrids. To further enhance its power quality, LC filters are typically employed as input filters cascaded with three-phase DAB converters. However, mismatched parameters can potentially cause stability issues in the cascaded system. To address this challenge, this papeSr establishes a state-space averaged small-signal mathematical model of the DAB3 converter. Additionally, the input impedance models of the LC-DAB3 converter are derived to assess the stability of the cascaded system. The effects of the LC filter parameters on the stability of the LC-DAB3 converter are elucidated. Finally, simulation results are presented to validate the impedance model and stability analysis of the LC-DAB3 converter.

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Stability Analysis and Impedance Modeling of Three-Phase Dual Active Bridge with LC Input Filter

  • 会议论文

  • 发表日期：

    2025年

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  • Ning Wang,
  • Yongbin Jiang,
  • Lu Cui,
  • Shilin Liu,
  • Mingxuan Li,
  • Dongsheng Cai,
  • Weihao Hu,
  • Zhe Chen

摘要

Three-phase dual active bridge (DAB3) converters are considered as a favorable choice in dc microgrids. To further enhance its power quality, LC filters are typically employed as input filters cascaded with three-phase DAB converters. However, mismatched parameters can potentially cause stability issues in the cascaded system. To address this challenge, this papeSr establishes a state-space averaged small-signal mathematical model of the DAB3 converter. Additionally, the input impedance models of the LC-DAB3 converter are derived to assess the stability of the cascaded system. The effects of the LC filter parameters on the stability of the LC-DAB3 converter are elucidated. Finally, simulation results are presented to validate the impedance model and stability analysis of the LC-DAB3 converter.