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When planned islanding events occurs, traction converters face transient issues caused by hard switching between grid-following (GFL) and grid-forming (GFM) modes, as well as dependency on rapid islanding detection. To address these challenges, a frequency-adaptive hybrid control strategy for grid-connected/islanded traction converters is proposed in this paper. Firstly, the droop control and DC voltage control (DVC) loops are maximally integrated. Secondly, GFL/GFM weighting coefficient is embedded into the non-integrable frequency droop loop and DVC loop, forming a hybrid control architecture. The weighting coefficient, defined as function of frequency deviation, dynamically adjusts when sudden islanding induces frequency deviations. Consequently, the participation weights of GFM and GFL are reconfigured, enabling flexible mode transition without structural switching. Finally, the feasibility of the proposed control strategy is validated through simulations on the SIMULINK platform.

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Frequency-Adaptive Hybrid Control Strategy for Grid-Connected/Islanded Traction Converters in Renewable Energy Systems

  • 会议论文

  • 发表日期：

    2026年

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  • Wenquan Liu,
  • Cheng Luo,
  • Yu Zhang,
  • Peng Cheng,
  • Limin Jia

摘要

When planned islanding events occurs, traction converters face transient issues caused by hard switching between grid-following (GFL) and grid-forming (GFM) modes, as well as dependency on rapid islanding detection. To address these challenges, a frequency-adaptive hybrid control strategy for grid-connected/islanded traction converters is proposed in this paper. Firstly, the droop control and DC voltage control (DVC) loops are maximally integrated. Secondly, GFL/GFM weighting coefficient is embedded into the non-integrable frequency droop loop and DVC loop, forming a hybrid control architecture. The weighting coefficient, defined as function of frequency deviation, dynamically adjusts when sudden islanding induces frequency deviations. Consequently, the participation weights of GFM and GFL are reconfigured, enabling flexible mode transition without structural switching. Finally, the feasibility of the proposed control strategy is validated through simulations on the SIMULINK platform.