接地故障下特高压直流换流站过电压特性及影响因素研究  

Study on Overvoltage Characteristics and Influencing Factors of UHVDC Converter Station in Grounding Fault Condition

作　　者：张宗扬 康超 王致远 余芳[1] 马子鑫 郭洁[1] ZHANG Zongyang;KANG Chao;WANG Zhiyuan;YU Fang;MA Zixin;GUO Jie(College of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《高压电器》2025年第3期144-151,共8页High Voltage Apparatus

摘　　要：直流系统发生接地故障时会在换流站内一些设备上引起过电压,由于运行方式与设备类型的不同,与交流系统内过电压有很大差异。文中基于上海庙—临沂±800 kV特高压直流输电工程,研究了直流极线接地、直流母线接地与换流变阀侧接地故障工况下换流站内不同位置的过电压特性,分析了平波电抗器、滤波电容器与接地极线参数对过电压特性的影响,研究结论对受端分层接入的直流系统换流站内过电压抑制和绝缘配合具有参考价值。In case of grounding fault of DC system,overvoltage will appear on some equipment in converter station.Due to different operation mode and type of equipment,it is very different from overvoltage in AC system.Based on Shanghaimiao-Linyi±800 kV UHVDC transmission project,the overvoltage characteristics of the converter station under the conditions of DC pole line grounding,DC bus grounding and converter transformer valve side grounding fault are studied in this paper.The influence of smoothing reactor,filter capacitor and grounding pole line on overvoltage is analyzed.The study calculation provides a reference for the overvoltage suppression and insulation coordination of DC converter station with layered access at the inverter side.

关 键 词：特高压直流输电 接地故障 换流站 平波电抗器 滤波电容器 接地极线 

分 类 号：TM721.1[电气工程—电力系统及自动化]