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<p>Virtual oscillator control (VOC) strategy is a new distributed control method which has great potential for grid-connected inverter. However, in stiff grid with large short circuit ratio (SCR), VOC tends to lose synchronicity with the grid, since the lack of system inertia. In this article, a complete small-signal model of grid-connected inverter with voltage-current inner loop VOC is presented. Then, an adaptive virtual impedance control strategy including line impedance estimation is proposed based on system stability assessment with eigenvalue. The proposed control strategy not only improves the system stability, but also compensates for the voltage drop due to the line impedance and the added virtual impedance. The effectiveness of the proposed strategy is verified by simulation in MATLAB/Simulink and experiments.</p>

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An adaptive virtual impedance control strategy for grid-connected inverter with voltage-current inner loop virtual oscillator control

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Min Huang,
  • Shifeng Zhang,
  • Haoning Chen,
  • Weimin Wu,
  • Zhilei Yao

摘要

Virtual oscillator control (VOC) strategy is a new distributed control method which has great potential for grid-connected inverter. However, in stiff grid with large short circuit ratio (SCR), VOC tends to lose synchronicity with the grid, since the lack of system inertia. In this article, a complete small-signal model of grid-connected inverter with voltage-current inner loop VOC is presented. Then, an adaptive virtual impedance control strategy including line impedance estimation is proposed based on system stability assessment with eigenvalue. The proposed control strategy not only improves the system stability, but also compensates for the voltage drop due to the line impedance and the added virtual impedance. The effectiveness of the proposed strategy is verified by simulation in MATLAB/Simulink and experiments.