作　　者： ;

机构地区： 中国南方电网

出　　处： 《电气技术》 2020年第6期95-101,共7页

摘　　要： 本文分析牛从直流从西站发生各典型故障时的发展趋势以及控制保护系统的动作原理,找出当前系统存在的不足,以提高直流系统运行可靠性。在牛从直流PSCAD/EMTDC仿真模型中设置从西站多种故障,对故障发展趋势以及控制保护系统动作原理进行深入研究发现:从西站换流变以及阀区故障都会引起换相失败;换流变网侧故障对直流系统影响有限,故障消除后系统可恢复正常;阀短路、换流变阀侧故障以及阀桥之间母线接地时,保护会迅速动作隔离故障;直流出口短路将导致两站接地极长时流过高压直流电流,建议提高保护灵敏度。 In order to analysis the development trend of typical faults in Cong Xi Station of Niu-cong HVDC and the operation principle of control and protection system,and find out the shortcomings of the current system and improve the operation reliability of Niu-cong HVDC.This article setting up multiple faults in Cong Xi Station in the simulation model of Niu-cong HVDC PSCAD/EMTDC.The development trend of faults and the operation principle of the control and protection system are studied in depth.It is found that the commutation failure can be caused by the converter transformer and valve zone failure in Cong Xi Station.The network side fault of converter transformer has limited influence on HVDC system.The HVDC system can be restored to normal after the fault is eliminated.The HVDC protection will act quickly when valve is short-circuited,or the converter transformer valve side and the bus between valve bridges is fault.Short-circuit of HVDC outlet will lead to high-voltage DC current flowing over two stations grounding poles for a long time.So it is suggested that the sensitivity of protection should be improved.

关 键 词： 牛从直流 从西站 从西站典型故障 仿真 换相失败

领　　域： []