电力系统自动化2026，Vol.50Issue(6)：72-86,15.DOI:10.7500/AEPS20250307001
环形电流限幅下构网型变流器并网暂态同步稳定性分析
Transient Synchronization Stability Analysis of Grid-forming Converters with Grid Connection Under Circular Current Limiting
摘要
Abstract
The transient synchronization characteristics of grid-forming converters with grid connection are significantly affected by the current limiting unit.Unlike single-axis(d-axis or q-axis)current limiting,the circular current limiting is able to balance both active and reactive power regulation demands,making it a critical type in the engineering design.However,the transient synchronization stability characteristics of grid-connected devices under its influence are still unclear.First,this paper studies the influence mechanism of circular current limiting on the transient synchronization of grid-forming converters with grid connection based on virtual synchronous generator control.It is demonstrated that during the circular current limiting period,there is a jump between the virtual power angle of the converter and the angle of its internal potential and the grid voltage phasor,resulting in the converter exhibiting time-varying phase characteristics as a current source.Then,a calculation method for critical clearing angle considering damping terms is proposed,and the transient synchronization stability characteristics of grid-forming converters with grid connection are further analyzed.It is found that the virtual power angle curves of the converter during the current limiting period are a group of cosine curves with time-varying offsets.Moreover,reduced current limiting thresholds will deteriorate the transient synchronization stability margins of the converters with grid connection.Finally,simulation results validate the correctness of the theoretical analysis.关键词
虚拟同步机/暂态同步/稳定性/构网型变流器/阻尼/电流限幅/虚拟功角曲线Key words
virtual synchronous generator/transient synchronization/stability/grid-forming converter/damping/current limiting/virtual power angle curve引用本文复制引用
林宇轩,李威,朱玲,唐弘阳..环形电流限幅下构网型变流器并网暂态同步稳定性分析[J].电力系统自动化,2026,50(6):72-86,15.基金项目
国家自然科学基金企业创新发展联合基金资助项目(U22B6008). This work is supported by National Natural Science Foundation of China(No.U22B6008). （U22B6008）
