摘要
传统同塔双回线路保护为单回线配置,即按两回独立线路配置保护,因此跳合闸策略也多为独立配置,跨线故障发生后将导致同塔双回线路全线跳闸。线路两侧系统电气联系中断,造成严重负荷损失,威胁电力系统安全稳定运行。针对全程同塔双回的输电线路,重新定义了准三相运行,并对准三相运行的可行性进行了分析。在此基础上提出了同塔双回线路改进跳合闸策略,降低故障后全线跳闸的概率,减少断路器的跳合闸操作次数。利用PSCAD/EMTDC搭建了典型同塔双回线路模型,验证了准三相运行的可行性,并分析验证了改进跳合闸策略的优势。
Conventional protection of double-circuit transmission lines on the same tower trips and recloses the two circuits independently after the faults occurring in transmission line.The possibility of tripping all lines is high when inter-circuit faults occur.Large amount of load will be rejected and electrical link between two sides will be disconnected,which has negative effects on the stability of power system.A novel tripping and reclosing strategy is proposed which regards the double circuits as a whole.It can decrease the possibility of tripping all lines and reclose to permanent faults.The feasibility of quasi-three-phase operation(QTPO)is analyzed.A typical model of double-circuit transmission lines on the same tower is established in PSCAD/EMTDC.Some important electrical indexes which can reflect the performance of QTPO are analyzed by simulation.
作者
李世龙
滕予非
李小鹏
尹项根
陈卫
Li Shilong;Teng Yufei;Li Xiaopeng;Yin Xianggen;Chen Wei(State Grid Sichuan Electric Power Research Institute,Chengdu 610041,Sichuan,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处
《四川电力技术》
2019年第3期13-17,共5页
Sichuan Electric Power Technology
关键词
同塔双回线路
准三相运行
跳合闸策略
PSCAD/EMTDC
double-circuit transmission lines on the same tower
quasi-three-phase operation
tripping and reclosing strategy
PSCAD/EMTDC
