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This paper proposes an active filtering control method for grid-connected inverters to address the high complexity and computational burden of traditional multi-controller schemes. Departing from frequency-domain linear control paradigms, the proposed method employs Finite Control Set Model Predictive Control (FCS-MPC) to operate directly in the time domain within the αβ stationary frame. Its core innovation is the integration of a sliding-update-based virtual harmonic current construction mechanism, derived from Sliding Discrete Fourier Transform (SDFT), directly into the FCS-MPC prediction loop. This enables a single controller to achieve simultaneous fundamental current tracking and multi-harmonic suppression, eliminating the need for parallel resonant controllers or complex multi-frequency coordinate transformations. The computational load per iteration is small and scale-invariant. Furthermore, a tunable damping factor within the update law enhances system stability in weak grid conditions. Simulation results demonstrate a significant reduction in Total Harmonic Distortion (THD), with grid voltage THD decreasing from 9.2% to 2.5% and grid current THD from 5.6% to 3.2%. The proposed method offers a simplified structure, high control efficiency, and robust performance.

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An Integrated Active Filtering Control for Grid-Connected Inverters Using SDFT-Based Virtual Harmonic Current and FCS-MPC

  • 会议论文

  • 发表日期：

    2026年

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  • Wanlin Guan,
  • Jiancheng Ma,
  • Jun Zheng,
  • Shuang Rong,
  • Huaiyu Guo,
  • Baiyue Song,
  • Xin Chen

摘要

This paper proposes an active filtering control method for grid-connected inverters to address the high complexity and computational burden of traditional multi-controller schemes. Departing from frequency-domain linear control paradigms, the proposed method employs Finite Control Set Model Predictive Control (FCS-MPC) to operate directly in the time domain within the αβ stationary frame. Its core innovation is the integration of a sliding-update-based virtual harmonic current construction mechanism, derived from Sliding Discrete Fourier Transform (SDFT), directly into the FCS-MPC prediction loop. This enables a single controller to achieve simultaneous fundamental current tracking and multi-harmonic suppression, eliminating the need for parallel resonant controllers or complex multi-frequency coordinate transformations. The computational load per iteration is small and scale-invariant. Furthermore, a tunable damping factor within the update law enhances system stability in weak grid conditions. Simulation results demonstrate a significant reduction in Total Harmonic Distortion (THD), with grid voltage THD decreasing from 9.2% to 2.5% and grid current THD from 5.6% to 3.2%. The proposed method offers a simplified structure, high control efficiency, and robust performance.