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Aiming to address voltage harmonic distortion at the point of common coupling (PCC) in wind farms, this study proposes a harmonic suppression strategy for grid-forming converters (GFM) under weak-grid, grid-connected, and islanded conditions. The method employs bandpass filters and weighted feedforward to reshape the output impedance, effectively mitigating the coupling between output current harmonics and PCC voltage. Simulation results demonstrate that the strategy suppresses dominant harmonics, reducing PCC voltage total harmonic distortion (THD) from 4.84% to 2.5% in islanded operation and from 4.61% to 3.94% during grid-connected operation, while maintaining system passivity and stability. This approach provides a practical solution to enhance power quality in wind farm converter systems.

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Research on Harmonic Suppression Method of Grid-forming Converter Based on Feedforward of Output Current of Specific Sub-components

  • 会议论文

  • 发表日期：

    2026年

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  • Yu Luo,
  • Xiangyu Wang,
  • Liguo Wang,
  • Denis Sidorov,
  • Aliona Dreglea,
  • Alexey Iskakov

摘要

Aiming to address voltage harmonic distortion at the point of common coupling (PCC) in wind farms, this study proposes a harmonic suppression strategy for grid-forming converters (GFM) under weak-grid, grid-connected, and islanded conditions. The method employs bandpass filters and weighted feedforward to reshape the output impedance, effectively mitigating the coupling between output current harmonics and PCC voltage. Simulation results demonstrate that the strategy suppresses dominant harmonics, reducing PCC voltage total harmonic distortion (THD) from 4.84% to 2.5% in islanded operation and from 4.61% to 3.94% during grid-connected operation, while maintaining system passivity and stability. This approach provides a practical solution to enhance power quality in wind farm converter systems.