基于模量电容参数识别的永久性故障判别方法  

Permanent Faults Identification Method for Three-phase Autoreclosing Based on Capacitance Parameter

作　　者：梁振锋[1,2] 索南加乐[1] 宋国兵[1] 石光[3] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]西安理工大学水利水电学院,西安710048 [3]河南电力试验研究院,郑州450052

出　　处：《高电压技术》2011年第4期916-922,共7页High Voltage Engineering

基　　金：国家自然科学基金重点项目(51037005);国家自然科学基金(50877062)~~

摘　　要：为了提高电力系统并列运行的稳定性和供电可靠性,提出一种三相重合闸永久性故障判别方法。在输电线路发生短路故障且两侧断路器跳开后,该方法以并联电抗器电流作为已知量,瞬时性故障线模T形模型为参考模型建立参数识别方程,将电容参数作为待求参数,利用求解值与实际值的差异来区分永久性故障和瞬时性故障。瞬时性故障时,故障模型与求解模型一致,求解值与实际值差异很小;永久性故障时,故障模型与求解模型不一致,求解值与实际值差异明显。EMTP仿真表明,该方法能够有效判别永久性故障,能实现带并联电抗器输电线路的三相自适应重合闸。A novel three-phase adaptive reelosure scheme using capacitance parameter identification for transmission lines with shunt reactors is developed so as to improve the interconnected system transient stability and power supply reliability. The scheme uses T type equivalent model of aerial mode component of transient fault as the prototype and current of shunt reactors as known quantity, and takes the capacitance of transmission lines as the unknown pa- rameters to evaluate the difference between calculated capacitances and actual ones for distinguishing the transient and permanent fault. In the ease of transient fault, the capacitance difference is minute because the actual fault mod- el is consistent with the prototype. But in the case of permanent fault, the capacitance difference is distinct because the actual fault model is inconsistent with the prototype. EMTP simulation results show that the proposed scheme can reliably and effectively distinguish permanent fault from transient fault, and apply to the three-phase adaptive reclosure in transmission lines with shunt reactors.

关 键 词：输电线路 继电保护 并联电抗器电流 三相自适应重合闸 参数识别 线模分量 

分 类 号：TM773[电气工程—电力系统及自动化]