Abstract：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.
代书龙, 张锐, 刘百爽. 牛从直流从西站典型故障仿真分析研究[J]. 电气技术, 2020, 21(6): 95-101.
Dai Shulong, Zhang Rui, Liu Baishuang. Simulation and analysis of typical faults in Cong Xi Station of Niu-cong HVDC. Electrical Engineering, 2020, 21(6): 95-101.
2020, Vol. 21 
