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<p>Repetitive control is widely applied in grid-connected inverters for harmonic suppression. However, its performance degrades under grid frequency fluctuations. This paper proposes a high-order frequency self-adaptive selective harmonic repetitive control (HO-FSA-SHRC) scheme that integrates a high-order selective harmonic repetitive controller (HO-SHRC) with an infinite impulse response filter to mitigate frequency-induced degradation. Unlike conventional HO-SHRC, which only enhances adaptability within narrow ranges, or fractional-order selective harmonic repetitive control (FO-SHRC), which rely on complex filters with slower dynamics, the proposed method achieves a balance among adaptability, dynamic performance, and implementation efficiency. A composite structure with deadbeat (DB) control further improves the transient response, with stability criteria and parameter design provided. Experiments on a three-phase inverter demonstrate THD below 1%, steady-state tracking error of approximately 0.07&#xa0;A, and convergence within 0.08&#xa0;s, confirming its effectiveness.</p>

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High-order frequency self-adaptive selective harmonic repetitive control for grid-connected inverters

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Wenzhou Lu,
  • Wei Fang,
  • Xiaoqi Zhou,
  • Dezhi Xu

摘要

Repetitive control is widely applied in grid-connected inverters for harmonic suppression. However, its performance degrades under grid frequency fluctuations. This paper proposes a high-order frequency self-adaptive selective harmonic repetitive control (HO-FSA-SHRC) scheme that integrates a high-order selective harmonic repetitive controller (HO-SHRC) with an infinite impulse response filter to mitigate frequency-induced degradation. Unlike conventional HO-SHRC, which only enhances adaptability within narrow ranges, or fractional-order selective harmonic repetitive control (FO-SHRC), which rely on complex filters with slower dynamics, the proposed method achieves a balance among adaptability, dynamic performance, and implementation efficiency. A composite structure with deadbeat (DB) control further improves the transient response, with stability criteria and parameter design provided. Experiments on a three-phase inverter demonstrate THD below 1%, steady-state tracking error of approximately 0.07 A, and convergence within 0.08 s, confirming its effectiveness.