带并联电抗器输电线路三相跳闸后的模电流频率分析  

Analysis of mode current frequency after three-phase trip for transmission lines with shunt reactors

作　　者：宋国兵[1] 黄兴华[1] 徐海洋[1] 王婷[1] 樊占峰 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]许继集团有限公司,河南许昌461000

出　　处：《电力自动化设备》2017年第5期155-161,共7页Electric Power Automation Equipment

基　　金：国家电网公司科技项目(SGTYHT/14-JS-188)~~

摘　　要：利用瞬时性和永久性故障时故障端口的边界条件,由相模变换得到了时域和复频域的复合模网络,进而分析得到了并联电抗器模电流中的低频振荡频率。理论分析及仿真表明:在两侧全跳闸之前,并联电抗器模电流中存在工频分量;两侧均跳闸后,工频分量消失。此后,若该故障为永久性,并联电抗器模电流的振荡频率与故障类型有关,可能不存在低频成分,或者含有1种甚至2种低频成分;若该故障为瞬时性且故障点已熄弧,并联电抗器各模电流仅含1种低频成分;不同故障性质下的振荡频率基本不受故障位置和过渡电阻的影响。该分析结果可用于构造基于并联电抗器模电流频率特性的三相重合闸故障性质识别判据。By analyzing the boundary conditions with phase-mode transformation under transient fault and permanent fault,the time-domain and complex frequency-domain composite mode networks are achieved, based on which,the low oscillation frequencies of mode currents in shunt reactor are obtained. Theoretical analysis and simulation show that,the power-frequency component,which exists in the mode current before the trips of both sides ,will disappear after the trips;since then ,if the fault is permanent ,there may be zero, one or two low-frequency components in the mode current of shunt reactor,depending on the fault type;if the fault is transient and the are at the fault point is extinguished,there is only one low-frequency component in the mode current of shunt reactor;the oscillation frequencies of different fault types are hardly influenced by the fault location and transition resistance. The analytical results can be applied to the criterion of fault property identification for the three-phase adaptive recloser based on the oscillation frequency of mode current.

关 键 词：并联电抗器 三相跳闸 模电流 振荡频率 故障性质 

分 类 号：TM761[电气工程—电力系统及自动化]