云广特高压直流输电线路孤岛运行过电压及抑制  

Temporary Overvoltage and Mitigation Measures for Islanding Operation of Yun-Guang UHVDC

作　　者：蔡汉生 金小明 王华伟[2] 吴娅妮[2] 

机构地区：[1]南方电网技术研究中心,广州510620 [2]中国电力科学研究院,北京100081

出　　处：《高电压技术》2009年第11期2634-2639,共6页High Voltage Engineering

基　　金：国家"十一五"科技支撑计划(2006BAA2A18)~~

摘　　要：云广直流孤岛运行方式下发生直流双极闭锁时将在送端换流站交流系统产生幅值很高的过电压,孤岛运行过电压水平控制是决定能否孤岛运行的关键因素,因此利用EMTDC计算了不同运行方式下楚雄换流站交流侧的过电压水平、避雷器工况、交流滤波器断路器断口暂态恢复电压及容性开断电流,并分析比较了各种不同的过电压抑制措施,提出了利用换流变磁饱和特性短时限制过电压的措施方案和电气设备的技术参数要求,同时还探讨了直流闭锁后换流变和交流滤波器切除时间等对过电压的影响。High amplitude overvoltage will occur in the AC system after the bipole blocking under the islanding operation of Yun-Guang UHVDC. Over-voltage control is a key factor, because it can decide that the islanding operation can be adopted or not. Over-voltage level, energy of MOA and transient recovery voltage of AC filter breaker are calculated using EMTDC program. After analyzing and comparing a variety of over-voltage suppressing measures, using the magnetic saturation of converter transformers to suppress over-voltage is put forward. Influence on over- voltage of switching off timing of AC filters and converter transformers when DC link blocked is also investigated. At last , over-vohage mitigation measures are presented.

关 键 词：云广特高压直流 孤岛运行 直流闭锁 过电压 抑制措施 氧化锌避雷器 断路器断口恢复电压 

分 类 号：TM862[电气工程—高电压与绝缘技术]