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In this paper, a variant SRF-PLL with amplitude normalization scheme (ANS) and PI controller rearrangement is analyzed in the nonlinear domain. The origin of the variant structure is described. As the ANS makes the structure amplify its phase error properly under nonlinear conditions to achieve a faster control effect, while the PI controller rearrangement smooths the peak of frequency estimation. The differential equations are given under nonlinear conditions, which make the tracking performance of the input signal with amplitude jump is also included in the nonlinear analysis. The faster dynamic process and better tracking performance compared with traditional SRF-PLL is accurately and completely shown by the state trajectory.

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A Simple Variant to Improve the SRF-PLL’s Performance Under Nonlinear Conditions

  • 会议论文

  • 发表日期：

    2025年

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  • Yazhao Yang,
  • Qi Liu,
  • Li Zhang

摘要

In this paper, a variant SRF-PLL with amplitude normalization scheme (ANS) and PI controller rearrangement is analyzed in the nonlinear domain. The origin of the variant structure is described. As the ANS makes the structure amplify its phase error properly under nonlinear conditions to achieve a faster control effect, while the PI controller rearrangement smooths the peak of frequency estimation. The differential equations are given under nonlinear conditions, which make the tracking performance of the input signal with amplitude jump is also included in the nonlinear analysis. The faster dynamic process and better tracking performance compared with traditional SRF-PLL is accurately and completely shown by the state trajectory.