基于故障全量的输电线路纵联阻抗算法  

A Transmission Line Pilot Impedance Algorithm Based on Fault Total Contents

作　　者：夏经德[1] 索南加乐[1] 何世恩[1] 王莉[1] 刘凯[1] 许立强[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《上海交通大学学报》2011年第6期814-820,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(50677051;50877061);高等学校博士学科点专项科研基金(20070698057)资助项目

摘　　要：提出了一种基于线路两端故障全量的输电线路纵联阻抗算法,在准确地总结基于故障分量纵联阻抗特性的基础上,充分地描述了在各种运行条件下负荷分量对计算结果的影响,确立了合理的保护动作定值.该算法不需专设保护启动元件,在系统运行的任何时刻,一旦计算结果小于保护动作定值,就可确定为区内故障,线路两端保护可协同动作;否则不论是否发生故障,保护都可靠不动.在电磁暂态程序(EMTP)中建立1 MV 500 km线路模型,使用兰州东至咸阳750 kV动模数据,进行了各种故障下的仿真.仿真结果表明,所提出的算法稳定可靠,抗过渡电阻能力较强,动作灵敏,具有自选相能力,能正确判断出上述各故障状态.A pilot protection algorithm of transmission line based on the fault total content of line both terminals was proposed.According to the exact analysis of the pilot impedance characteristics based on the fault conponent,this algorithm adequately described the computing result influenced by the load component under various operation condition,and established the reasonable protection tripping setting value.It does not set special protection starting unit;at any time of system running,when the result is less than the protection tripping setting value,the fault is determined as the internal and the protections at line＇s two terminals may cooperatively trip;otherwise,the protection is blocked whether the fault occurs or not.The algorithm may ensure the stable and reliable results,has strong ability of resisting transition resistance,shows sensitive operating reaction characterictics and possesses self-selecting phase capacity.It builds 1 000 kV 500 km line model on electro-magnetic transients program（EMTP）,uses the dynamic model data from Lanzhoudong to Xianyang 750kV,executes the simulations under different faults.The simulation results indicate that this algorithm can correctly judge the aforesaid various fault states.

关 键 词：输电线路 故障全量 纵联阻抗 两端电气量 幅值判据 

分 类 号：TM773[电气工程—电力系统及自动化]