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<p>For LCL-filtered inverters, a comprehensive grid voltage feedforward effectively enhances inverter output impedance, thereby suppressing multiple-order harmonic distortions. However, prevailing feedforward strategies typically incorporate three parallel compensation branches, resulting in control architecture complexity that impedes practical implementation. To address this challenge, the intrinsic coupling mechanism between derivative-based active damping (AD) and grid voltage feedforward is analyzed. Subsequently, a simplified full grid voltage feedforward strategy is developed based on this analysis. Concurrently, from a control-theoretic perspective, the fundamental control mechanism of feedback-based AD is examined. Taking second-order derivative feedback AD for grid-injected current as a representative case, an optimized implementation approach for the second-order derivative is developed. Experimental validation via a 3-kW LCL-type inverter prototype demonstrates the efficacy of the proposed strategy.</p>

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Comprehensive feedforward scheme for grid voltage with simplified structure and optimized implementation

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Mingming Li,
  • Luoming Ouyang,
  • Di Wu

摘要

For LCL-filtered inverters, a comprehensive grid voltage feedforward effectively enhances inverter output impedance, thereby suppressing multiple-order harmonic distortions. However, prevailing feedforward strategies typically incorporate three parallel compensation branches, resulting in control architecture complexity that impedes practical implementation. To address this challenge, the intrinsic coupling mechanism between derivative-based active damping (AD) and grid voltage feedforward is analyzed. Subsequently, a simplified full grid voltage feedforward strategy is developed based on this analysis. Concurrently, from a control-theoretic perspective, the fundamental control mechanism of feedback-based AD is examined. Taking second-order derivative feedback AD for grid-injected current as a representative case, an optimized implementation approach for the second-order derivative is developed. Experimental validation via a 3-kW LCL-type inverter prototype demonstrates the efficacy of the proposed strategy.