换流站近端交流线路不同故障点对高压直流输电系统影响机理研究  

Study on Influence Mechanism of Different Fault Points of AC Line Near Converter Station on HVDC Transmission System

作　　者：代书龙 刘百爽 张锐[1] 滕昭林 徐学海 辛亮 周亚树 Dai Shulong;Liu Baishuang;Zhang Rui;Teng Zhaolin;Xu Xuehai;Xin Liang;Zhou Yashu(Qujing Bureau,CSG EHV Power Transmission Company,Qujing,655000,China)

机构地区：[1]中国南方电网超高压输电公司曲靖局,云南曲靖655000

出　　处：《云南电力技术》2022年第3期83-87,共5页Yunnan Electric Power

摘　　要：为研究典型高压直流输电系统中,交流线路不同位置经不同阻抗接地时直流系统的响应特性,在PSCAD/EMTDC(Power System Computer Aided Design/Electro-Magnetic Transient Including Direct Current)中利用直流输电系统测试模型对交流线路单相和三相经电阻和电抗接地,交流线路发生高阻接地并经线路本身电阻和电抗后直流系统响应情况进行了研究。发现交流线路发生接地故障时,在一定距离范围内,故障点越靠近换流站母线,对直流系统影响越大,超过该范围时,越靠近换流站母线,对直流系统影响越小。整流站三相接地故障对直流系统的影响明显大于单相接地故障,逆变站母线处发生故障极易引发换相失败,但逆变站三相接地以及单相接地导致的直流电流幅值相差不大。In order to study the response characteristics of HVDC system in typical HVDC transmission system when AC line is grounded through different impedance at different positions,In PSCAD/EMTDC(Power System Computer Aided Design/Electro-Magnetic Transient Including Direct Current),the test model of HVDC transmission system is used to study the response of HVDC system after single-phase and three-phase AC lines are grounded through resistance and reactance,AC lines are grounded with high resistance and through resistance and reactance of the line itself.It is found that in case of grounding fault of AC line,within a certain distance,the closer the fault point is to the bus of converter station,the greater the impact on HVDC system.Beyond this range,the closer it is to the bus of converter station,the smaller the impact on HVDC system.The impact of three-phase grounding fault of rectifier station on HVDC system is significantly greater than that of single-phase grounding fault.The fault at the bus of inverter station is very easy to cause commutation failure,but the amplitude of HVDC current caused by three-phase grounding and singlephase grounding of inverter station is little difference.

关 键 词：高压直流输电系统 不同阻抗接地 响应特性 PSCAD/EMTDC仿真 

分 类 号：TM74[电气工程—电力系统及自动化]