基于阀短路保护的HVDC换流器区内故障定位新方法  

A New Valve Short-circuit Protection Based Method for Identifying Fault Locations in HVDC Converters

作　　者：郑涛 祁欢欢 范莹 

机构地区：[1]新能源电力系统国家重点实验室,华北电力大学,北京市102206

出　　处：《电力系统自动化》2013年第5期99-104,共6页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB215206);国家自然科学基金重点资助项目(50837002);中央高校基本科研业务费专项资金资助项目~~

摘　　要：阀短路保护在高压直流输电系统中起到换流器主保护的作用。现有的2类阀短路保护中,仅第1类阀短路保护能够反应于换流器区内的接地故障。但是,对于换流器区内的同一故障,第1类阀短路保护的动作具有不确定性;对于换流器区内的不同故障,第1类阀短路保护的动作具有相似性。文中结合MATLAB仿真,详细分析了接地故障下,第1类阀短路保护的动作特性;根据同一接地故障下第1类阀短路保护动作情况的不同,提出了一种故障时段划分方法,从而能够明确保护的动作情况;讨论了换流器区内不同故障下,第1类阀短路保护动作情况的相似性以及区分方法。综合上述故障时段划分方法及故障类型区分方法,提出了一种换流器区内故障定位的新方法。Valve short-circuit protection acts as the primary protection for high voltage direct current converters. There are two types of valve short-circuit protections, and only the first one can discriminate the grounding faults in the converter. However, the performance of this type is uncertain in some fixed fault case, while under other different fault cases, the protection performance may be similar. The first type of valve short-circuit protection performance under the grounding faults is analyzed in detail by using MATLAB simulation. According to the simulation results under the same fault case, a method for dividing fault stages is proposed to confirm protection performance. Meanwhile, because of the similarity of the protection performance during different grounding faults, a method of distinguishing different faults is developed. Based on above two methods, a novel method for fault location in the converter is proposed.

关 键 词：高压直流 输电系统 阀短路保护 故障时段 故障定位 

分 类 号：TM721.1[电气工程—电力系统及自动化]