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<p>This paper proposes a frequency-adaptive dual-mode repetitive control (FA-DMRC) strategy for grid-tied inverters to address harmonic compensation degradation in conventional DMRC caused by non-integer delays during grid frequency variations. The FA-DMRC employs a Lagrange interpolation-based fractional-order delay filter to dynamically adjust delay length, ensuring precise periodic signal tracking under fluctuating grid frequencies without altering the sampling rate. Moreover, by adding FA-DMRC into the ins-tantaneous feedback control loop, a generic plug-in FA-DMRC control strategy is established to achieve comprehensively satisfactory control performance. A universal approach to the analysis and synthesis of the plug-in FA-DMRC scheme has been developed, encompassing an accessible gain stability criterion and gain-tuning rules. Experimental validation on a 3kVA grid-connected inverter shows grid current total harmonic distortion (THD) below 1.43% across 49.5–50.5 Hz frequency variations, with tracking errors converging within 50 ms. Compared to traditional DMRC, FA-DMRC reduces THD by 25% under frequency deviations. This strategy enhances grid-tied converter control by enabling high-precision current regulation in dynamic grid conditions, supporting stable renewable energy integration.</p>

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Frequency-Adaptive Dual Mode Repetitive Current Control Strategy for Grid-Tied Converters

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Chao Tang,
  • Keliang Zhou,
  • Qingqing He,
  • Zhong Wang

摘要

This paper proposes a frequency-adaptive dual-mode repetitive control (FA-DMRC) strategy for grid-tied inverters to address harmonic compensation degradation in conventional DMRC caused by non-integer delays during grid frequency variations. The FA-DMRC employs a Lagrange interpolation-based fractional-order delay filter to dynamically adjust delay length, ensuring precise periodic signal tracking under fluctuating grid frequencies without altering the sampling rate. Moreover, by adding FA-DMRC into the ins-tantaneous feedback control loop, a generic plug-in FA-DMRC control strategy is established to achieve comprehensively satisfactory control performance. A universal approach to the analysis and synthesis of the plug-in FA-DMRC scheme has been developed, encompassing an accessible gain stability criterion and gain-tuning rules. Experimental validation on a 3kVA grid-connected inverter shows grid current total harmonic distortion (THD) below 1.43% across 49.5–50.5 Hz frequency variations, with tracking errors converging within 50 ms. Compared to traditional DMRC, FA-DMRC reduces THD by 25% under frequency deviations. This strategy enhances grid-tied converter control by enabling high-precision current regulation in dynamic grid conditions, supporting stable renewable energy integration.