滇西北特高压直流工程FPT试验中阀误触发保护误动作分析与解决方案探讨  

Analysis and Solution Discussion of Valve Misfire Protection Misoperation in FPT of Dianxibei UHVDC Project

作　　者：郭海平 刘志江[3] 李书勇[1,2] 郭琦 夏成军[3] 杜兆斌 

机构地区：[1]直流输电技术国家重点实验室(南方电网科学研究院),广州510663 [2]中国南方电网公司仿真重点实验室,广州510663 [3]华南理工大学电力学院,广州510641

出　　处：《南方电网技术》2017年第8期1-7,15,共8页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51577071);广东省自然科学基金资助项目(2015 A030313202)~~

摘　　要：在滇西北直流工程功能特性试验(FPT)中模拟送端交流侧发生700 ms的两相金属性短路故障时,出现阀误触发保护误动作导致新松站极Ⅱ紧急停运现象。从理论上分析了发生阀误触发保护误动作的原因,发现滇西北直流工程整流站交流侧发生不平衡故障后,由于阻波器与避雷器的相互作用,造成交流电压波形畸变,原有的阀误触发保护的交流低电压判据不适应而引起误动作。提出采用交流电压的真有效值或基波分量两种判断交流低电压的解决方案,并验证了有效性。In the functional performance tests（ FTP） of Dianxibei UHVDC project,after 700 ms two-phase metal short-circuit fault on AC line at the rectifier side,it is found that valve misfire protection misoperation leads to instant outage of pole 2 in Xinsong Station.In this paper,the cause of valve misfire protection misoperation is analyzed theoretically. It is found that the AC voltage waveform distortion is caused by the interaction between the wave trap coil and the lightning arrester after the unbalanced fault at the AC side of the rectifier station of the Dianxibei UHVDC project. The original low AC voltage criterion of valve misfire protection cannot match the condition and causes misoperation. Finally,two solutions are proposed in which the true RMS and the fundamental component of the AC voltage are used to judge low AC voltage,and the effectiveness is verified.

关 键 词：滇西北特高压直流工程 功能特性试验 避雷器 阻波器 阀误触发保护 

分 类 号：TM721.1[电气工程—电力系统及自动化]