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<p>This paper proposes an improved harmonic current detection approach to overcome the structural complexity and slow dynamic response of the conventional instantaneous reactive power theory (ip-iq) method. The proposed scheme employs an improved third-order generalized integrator (ITOGI) with a cross-decoupled structure, which fuses the filtering characteristics of the TOGI and the notch property of a notch filter. As a result, the method achieves fast extraction and polarity identification of specific frequency components while enhancing filtering performance. The positive-sequence fundamental components of grid voltage and load current are precisely separated and directly applied to the harmonic detection stage. In addition, the phase-locked loop (PLL) built upon the proposed integrator maintains accurate frequency and phase tracking even under DC bias or unbalanced grid conditions, eliminating the dependence of traditional approaches on voltage symmetry. Both theoretical analysis and simulation results confirm that the proposed method offers low computational burden and significantly improved harmonic detection accuracy compared with the conventional ip-iq algorithm.</p>

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Harmonic detection method based on an improved third-order generalized integrator

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Chongying Xu,
  • Jiahao Tong,
  • Dongcheng Zhou,
  • Huaixun Zhang,
  • Wenxu Yan,
  • Wenyuan Wang

摘要

This paper proposes an improved harmonic current detection approach to overcome the structural complexity and slow dynamic response of the conventional instantaneous reactive power theory (ip-iq) method. The proposed scheme employs an improved third-order generalized integrator (ITOGI) with a cross-decoupled structure, which fuses the filtering characteristics of the TOGI and the notch property of a notch filter. As a result, the method achieves fast extraction and polarity identification of specific frequency components while enhancing filtering performance. The positive-sequence fundamental components of grid voltage and load current are precisely separated and directly applied to the harmonic detection stage. In addition, the phase-locked loop (PLL) built upon the proposed integrator maintains accurate frequency and phase tracking even under DC bias or unbalanced grid conditions, eliminating the dependence of traditional approaches on voltage symmetry. Both theoretical analysis and simulation results confirm that the proposed method offers low computational burden and significantly improved harmonic detection accuracy compared with the conventional ip-iq algorithm.