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<p>The grid-following converter's voltage and phase-locked loop (PLL) controllers have the response time in the hundreds of milliseconds, leading to the dynamic interaction in low-frequency range. For quantitatively evaluating the oscillation, the unified amplitude-phase model for grid-following converter was established, calculating the damping of converter and dynamic interaction between controller. The system stability under the variations of short-circuit ratio (SCR) and controller parameters is evaluated, which provides parameter selection range. Simulation and experimental were established to verify the response of amplitude-phase model. The results indicated that in active power control, converter exhibits weak damping. The interaction among controllers is enhanced in the frequency of 0–15&#xa0;Hz, which is corresponding with control modes. The bandwidth of the PLL aims to improve the damping of the converter, and its selection is related to the converter capacity.</p>

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Analysis of oscillation characteristics and internal dynamic interactions of grid-following converter

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Enming Bai,
  • Jianyuan Xu

摘要

The grid-following converter's voltage and phase-locked loop (PLL) controllers have the response time in the hundreds of milliseconds, leading to the dynamic interaction in low-frequency range. For quantitatively evaluating the oscillation, the unified amplitude-phase model for grid-following converter was established, calculating the damping of converter and dynamic interaction between controller. The system stability under the variations of short-circuit ratio (SCR) and controller parameters is evaluated, which provides parameter selection range. Simulation and experimental were established to verify the response of amplitude-phase model. The results indicated that in active power control, converter exhibits weak damping. The interaction among controllers is enhanced in the frequency of 0–15 Hz, which is corresponding with control modes. The bandwidth of the PLL aims to improve the damping of the converter, and its selection is related to the converter capacity.