摘要
针对换流站单极直流极线接地故障影响因素展开研究,提出双辅支路抑制故障方案。建立±800 kV换流站仿真模型及直流导线模型,分析故障位置对故障程度的影响。模拟换流站单极直流极线接地,验证“阻耗+速断”双辅支路抑制故障方案的有效性。结果表明,接地故障发生在线路中点时,系统过压过流现象最严重。双辅支路可有效抑制故障电压、电流极值差,优化电压、电流波动范围及恢复稳态时间,有效降低故障危害。研究结果可为±800 kV换流站直流侧故障抑制方案设计提供参考。
In view of the influencing factors of the single-pole DC pole line ground fault in the converter station,the dual auxiliary branch suppression scheme is proposed.The±800 kV converter station simulation model and DC wire model are established to analyze the influence of fault location on the degree of fault.The single-pole DC pole line grounding fault of the converter station is simulated to verify the suppression effect of the“resistance+quick break”dual auxiliary branch on the voltage and current after the fault.The results show that when the ground fault occurs at the midpoint of the line,the system over-voltage and over-current is the most serious.The extreme value and fluctuation range of the fault voltage and current are effectively suppressed by the double auxiliary branch.The optimized voltage,current fluctuation range and steady state recovery time can effectively reduce fault hazards.The research results provide a reference for the design of the fault suppression scheme for the DC side of the±800 kV converter station.
作者
刘雨佳
何柏娜
吴硕
孟凡涛
刘洋
LIU Yujia;HE Baina;WU Shuo;MENG Fantao;LIU Yang(College of Electric and Electronic Engineering,Shandong University of Technology,Zibo,Shandong 255090,China)
出处
《东北电力技术》
2022年第12期26-30,共5页
Northeast Electric Power Technology
基金
山东省自然科学基金项目(ZR2021ME057)
校城融合项目“高压侧微功率取源技术研究及其应用”(2021JSCG0008)
山东省研究生教育质量提升计划项目(SDYKC19103)。
关键词
内过电压
特高压直流输电
单极直流极线接地故障
故障电流抑制
internal over-voltage
UHVDC transmission
unipolar DC pole line ground fault
fault current suppression
