中国电机工程学报2026，Vol.46Issue(15)：6242-6257,中插8,17.DOI:10.13334/j.0258-8013.pcsee.251056
无功电流优化注入的柔性低频系统工频侧距离保护性能提升方法
Performance Enhancement Method for Power-frequency Side Distance Protection in Flexible Low-frequency Systems via Optimized Reactive Current Injection
摘要
Abstract
As an efficient solution for medium to long-distance offshore wind power integration and large-scale onshore renewable energy base aggregation,flexible low-frequency transmission systems(FLFTS)demonstrate significant advantages in enhancing transmission capacity and reducing power losses.However,influenced by the fault ride-through control strategy of modular multilevel matrix converters(M3C),phase-to-phase short-circuit faults in power-frequency lines pose substantial risks of protection failure(failure to operate/maloperation)for phase-comparison distance protection.This paper reveals the influence mechanism of M3C control strategies on the performance of distance protection.Building upon this analysis,a coordinated fault ride-through control strategy for M3C based on reactive current optimization injection is proposed.The strategy comprehensively considers multiple critical factors including protection performance enhancement,converter overcurrent limitations,and submodule capacitor overvoltage constraints,thereby formulating a complete control framework incorporating reclosing control and fault recovery mechanisms.The simulation results demonstrate that the proposed reactive current injection coordination strategy can significantly enhance the performance of distance protection,ensuring reliable operation within the protection zone and secure non-operation outside the zone,without adversely affecting system/converter overvoltage or overcurrent.关键词
柔性低频输电/比相式距离保护/控保协同/无功电流注入/电容电压均衡Key words
flexible low-frequency transmission/phase-comparison distance protection/control-protection coordination/reactive current injection/capacitor voltage balancing分类
信息技术与安全科学引用本文复制引用
何佳伟,侯卓延,李斌,周博昊,李晔,孙强,王文博..无功电流优化注入的柔性低频系统工频侧距离保护性能提升方法[J].中国电机工程学报,2026,46(15):6242-6257,中插8,17.基金项目
中电装备集团指南项目:新型电力系统保护控制关键技术研究与设备研制(CEE-2023-B-01-01-012-XJ) （CEE-2023-B-01-01-012-XJ）
国家自然科学基金项目(52577131) （52577131）
国家自然科学基金杰出青年科学基金项目(52025071).Project Supported by the Research on Key Technology and Equipment Development of Protection and Control of New Power System(CEE-2023-B-01-01-012-XJ) （52025071）
National Natural Science Foundation of China(52577131) （52577131）
Project Supported by National Natural Science Foundation of China for Distinguished Young Scholars(52025071). （52025071）
