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<p>The synchronization challenge of grid-connected inverters in distributed power systems has garnered significant attention. Traditional phase-locked loop (PLL) techniques often introduce stability issues in grid-connected systems, particularly under grid disturbances. This paper proposes a self-synchronizing, frequency-adaptive control strategy for LCL-filtered grid-connected inverters, eliminating the need for a PLL while effectively addressing grid harmonic distortions and frequency fluctuations. The proposed method estimates the grid voltage phase angle directly from the resonant control output, thereby bypassing the PLL. Additionally, a multiple second-order generalized integrator frequency-locked loop (MSOGI-FLL) is employed to accurately detect grid frequency variations and adaptively tune the resonant frequency of the proportional-resonant (PR) controller. Furthermore, the intermediate output of the resonator is utilized to estimate the capacitor current for feedforward compensation, enabling indirect control of the grid-side current. Theoretical analysis and derivations are provided to substantiate the proposed approach. Simulation and experimental results validate the superior dynamic performance and grid synchronization capability of the proposed control strategy under harmonic distortions and frequency fluctuations.</p>

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Adaptive Self-Synchronizing Control of Grid-Connected Inverters Under Distorted Grid Conditions

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Yiding Sun,
  • Zhangyong Chen,
  • Yong Chen,
  • Fuchuan Ding,
  • Daoming Luo

摘要

The synchronization challenge of grid-connected inverters in distributed power systems has garnered significant attention. Traditional phase-locked loop (PLL) techniques often introduce stability issues in grid-connected systems, particularly under grid disturbances. This paper proposes a self-synchronizing, frequency-adaptive control strategy for LCL-filtered grid-connected inverters, eliminating the need for a PLL while effectively addressing grid harmonic distortions and frequency fluctuations. The proposed method estimates the grid voltage phase angle directly from the resonant control output, thereby bypassing the PLL. Additionally, a multiple second-order generalized integrator frequency-locked loop (MSOGI-FLL) is employed to accurately detect grid frequency variations and adaptively tune the resonant frequency of the proportional-resonant (PR) controller. Furthermore, the intermediate output of the resonator is utilized to estimate the capacitor current for feedforward compensation, enabling indirect control of the grid-side current. Theoretical analysis and derivations are provided to substantiate the proposed approach. Simulation and experimental results validate the superior dynamic performance and grid synchronization capability of the proposed control strategy under harmonic distortions and frequency fluctuations.