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<p>The increasing integration of renewable energy sources such as photovoltaics and wind power is transforming traditional power systems but also introduces significant stability challenges due to the widespread use of power electronic converters. Addressing the stability issues related to potential harmonics and resonance in Grid-Forming Converters (GFM), this paper examines various voltage-current inner loop control structures and proposes a damping control algorithm to enhance system stability. Specifically, four different models of voltage feedforward and current feedback inner loop control structures are established to examine the sensitivity of GFM current loop control parameters, voltage loop control parameters, and stability under different SCRs. Based on this analysis, a dual differential damping algorithm is proposed to reshape the output impedance through phase lead compensation, effectively suppressing resonance caused by capacitive impedance characteristics. A 20&#xa0;kW hardware prototype is developed to validate the theoretical findings. Experimental results demonstrate that the proposed control strategy significantly enhances system stability and dynamic performance, offering practical guidance for GFM control in high-renewable-penetration power systems.</p>

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Impact of Inner-Loop Control Structures on Harmonic Stability of Grid-Forming Converters and Damping Suppression Strategies

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Jianming Su,
  • Haizhen Xu,
  • Deyu Zhu,
  • Changzhou Yu,
  • Wenguang Zhao,
  • Xiaoming Wang

摘要

The increasing integration of renewable energy sources such as photovoltaics and wind power is transforming traditional power systems but also introduces significant stability challenges due to the widespread use of power electronic converters. Addressing the stability issues related to potential harmonics and resonance in Grid-Forming Converters (GFM), this paper examines various voltage-current inner loop control structures and proposes a damping control algorithm to enhance system stability. Specifically, four different models of voltage feedforward and current feedback inner loop control structures are established to examine the sensitivity of GFM current loop control parameters, voltage loop control parameters, and stability under different SCRs. Based on this analysis, a dual differential damping algorithm is proposed to reshape the output impedance through phase lead compensation, effectively suppressing resonance caused by capacitive impedance characteristics. A 20 kW hardware prototype is developed to validate the theoretical findings. Experimental results demonstrate that the proposed control strategy significantly enhances system stability and dynamic performance, offering practical guidance for GFM control in high-renewable-penetration power systems.