可再生能源2026，Vol.44Issue(5)：661-672,12.
电网不对称故障下电压源换流器系统的暂态同步稳定性分析
Transient synchronous stability analysis of the VSC system during asymmetric grid faults
摘要
Abstract
The stability of voltage source converters(VSC)system based on the phase-locked loop(PLL)is very prominent during asymmetric grid faults.This article establishes a transient synchronous stability model based on the dual-sequence PLL of VSC system during low voltage ride through(LVRT)by referring to the equivalent rotor swing equation of synchronous generator(SG).Based on the model,the synchronization characteristics of the VSC system under asymmetric grid faults are described,and the interaction mechanisms,as well as the transient instability phenomena of positive and negative sequence PLL during asymmetric faults are explained.Moreover,by using the equal area criterion(EAC),the influence of sequence control switching action,detection delay,and interaction of positive and negative sequence PLL on the transient synchronous stability of VSC system are analyzed,respectively.In addition,a transient stability assessment criterion based on the critical fault clearance angle and time is proposed.Finally,the analysis results are validated through simulation.关键词
电压源换流器/不对称短路故障/双序锁相环/暂态同步稳定性/评估标准Key words
voltage source converters(VSC)/asymmetric grid faults/dual-sequence pll/transient synchronous stability/assessment criterion分类
能源科技引用本文复制引用
袁霞,赵永龙,王止一,邢法财,罗艺,梅燕,姚骏..电网不对称故障下电压源换流器系统的暂态同步稳定性分析[J].可再生能源,2026,44(5):661-672,12.基金项目
国家电网有限公司西南分部科技项目资助(52999825000H). （52999825000H）
