串补线路故障特征分析  

Fault characteristics analysis for series compensated line

作　　者：索南加乐[1] 吴双惠[1] 侯卓[1] 侯元文[2] 周芝萍 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]济源供电公司,河南济源454650 [3]许继电气股份有限公司,河南许昌461000

出　　处：《电力系统保护与控制》2012年第13期38-42,共5页Power System Protection and Control

摘　　要：串联补偿电容器的存在,使得高压输电串补线路阻抗出现非连续性,对目前广泛采用的继电保护原理产生影响。以750kV电压等级的串补输电线路为模型,用EMTP仿真建模,给出了最小二乘矩阵束法分析线路故障后电流信号中的自由分量分布以及衰减情况,得到串补输电线路的故障特征。仿真结果表明,利用最小二乘矩阵束法可以在故障后快速识别出信号频率及相应的衰减时间常数,给出保护安装处实际感受到的谐波变化情况。该方法适合于暂态谐波分析,为分析故障暂态对保护的影响提供一定的指导意义。Due to the series compensation capacitor, high-voltage transmission line impedance presents non-continuous performance which has an impact on the widely used relay principle. This paper establishes a simulation model of 750 kV series compensated line by EMTP sol, ware, and presents the free frequencies distribution and the decaying characteristics of current under transmission line fault by the least square matrix pencil method. The simulation results show that the method can accurately compute the frequencies and decaying factors and present the actual harmonic changes in the point of protection. This algorithm is suitable for transient harmonic analysis and provides guidance for transient protection.

关 键 词：串补线路 故障特征 最小二乘矩阵束法 

分 类 号：TM773[电气工程—电力系统及自动化]