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During unbalanced short-circuit events in power grid with limited strength that are connected to doubly-fed induction generator (DFIG), a complex dynamic coupling will emerge between the DFIG and the weak grid, which introduces the danger of oscillation instability. To examine the coupling mechanism, a multi-frequency domain impedance model of DFIG considering controller dynamics is initially developed in this study, and the dynamic interaction features between DFIG and the positive and negative sequence impedances of system is revealed. Based on the generalized Nyquist criterion, the impact of various parameters, including phase-locked loop (PLL) bandwidth and asymmetric fault degree on the dynamic stability of the system is evaluated. Finally, the theoretical analysis is demonstrated by simulation results.

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Research on the Oscillation Mechanism of Doubly-Fed Wind Turbines Under Asymmetric Short-Circuit Faults in Weak Power Grids

  • 会议论文

  • 发表日期：

    2026年

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  • Xiaoju Li,
  • Yuheng Yang,
  • Haibing Zhang,
  • Xue Chen,
  • Mincai Yang,
  • Jun Yao,
  • Yuan Li

摘要

During unbalanced short-circuit events in power grid with limited strength that are connected to doubly-fed induction generator (DFIG), a complex dynamic coupling will emerge between the DFIG and the weak grid, which introduces the danger of oscillation instability. To examine the coupling mechanism, a multi-frequency domain impedance model of DFIG considering controller dynamics is initially developed in this study, and the dynamic interaction features between DFIG and the positive and negative sequence impedances of system is revealed. Based on the generalized Nyquist criterion, the impact of various parameters, including phase-locked loop (PLL) bandwidth and asymmetric fault degree on the dynamic stability of the system is evaluated. Finally, the theoretical analysis is demonstrated by simulation results.