电力系统保护与控制2025，Vol.53Issue(9)：14-24,11.DOI:10.19783/j.cnki.pspc.241092
基于关断角动态方程的直流输电后续换相失败预测方法及优化控制
Prediction method and optimal control of subsequent commutation failure in LCC-HVDC system based on dynamic extinction angle equation
摘要
Abstract
In line-commutated converter-based high-voltage direct current(LCC-HVDC)systems,subsequent commutation failures are prone to occur following AC faults at the receiving end,seriously threatening the secure operation of the systems.To enhance the capability of suppressing subsequent commutation failures,this paper proposes a predictive optimization control method based on the dynamic extinction angle equation.By analyzing the dynamic characteristics of DC current and extinction angle during the recovery phase following the initial commutation failure,a differential dynamic equation for the extinction angle is established.Using phase-plane analysis,the mechanism of subsequent commutation failure is revealed:when the extinction angle decreases to a critical threshold and its rate of change remains negative,commutation failure occurs.To improve the suppression capability,a predictive optimization control method based on the dynamic extinction angle equation is proposed.A real-time prediction criterion is designed to dynamically calculate the extinction angle trend using the effective AC voltage magnitude and its rate of change.Simultaneously,a dynamic compensation control strategy is developed,in which a compensation term is added to the fixed extinction angle control to continuously adjust the reference in real time.Simulation results based on the CIGRE benchmark model demonstrate that the proposed prediction criterion achieves significantly higher accuracy than conventional methods under both three-phase and single-phase grounding faults.Moreover,the proposed optimal control strategy effectively suppresses subsequent commutation failures and significantly enhances the system's transient stability.关键词
高压直流输电/后续换相失败/关断角补偿/优化控制策略Key words
LCC-HVDC/subsequent commutation failure/extinction angle compensation/optimal control strategy引用本文复制引用
雷智威,马俊鹏,王顺亮,焦宁,刘天琪..基于关断角动态方程的直流输电后续换相失败预测方法及优化控制[J].电力系统保护与控制,2025,53(9):14-24,11.基金项目
国家自然科学基金青年基金项目资助(52207216)This work is supported by the Young Scientists Fund of National Natural Science Foundation of China(No.52207216). （52207216）
