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Transient stability of single Grid-forming inverter (GFMI) system has been thoroughly analyzed in recent studies, but quantitative assessment of transient stability of parallel GFMI system is still missing. To bridge this gap, the Lyapunov function considering the interaction between inverters is newly constructed, and the critical energy is accurately calculated based on potential energy boundary surface method to estimate the attraction region of parallel system in δ1 – δ2 plane. Then, the effect of control parameters on attraction region is revealed, indicating that the increase of damping D, and decrease of inertia J may deteriorate the transient stability of parallel GFMI system due to the interaction, which is distinct from single GFMI system.

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Transient Stability Analysis of Parallel Grid-Tied Grid-Forming Inverters

  • 会议论文

  • 发表日期：

    2025年

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  • Cong Luo,
  • Yandong Chen,
  • Mingkun Gao,
  • Yingying Zhang,
  • Shuhan Liao

摘要

Transient stability of single Grid-forming inverter (GFMI) system has been thoroughly analyzed in recent studies, but quantitative assessment of transient stability of parallel GFMI system is still missing. To bridge this gap, the Lyapunov function considering the interaction between inverters is newly constructed, and the critical energy is accurately calculated based on potential energy boundary surface method to estimate the attraction region of parallel system in δ1 – δ2 plane. Then, the effect of control parameters on attraction region is revealed, indicating that the increase of damping D, and decrease of inertia J may deteriorate the transient stability of parallel GFMI system due to the interaction, which is distinct from single GFMI system.