短路电磁暂态过程对距离保护影响的仿真分析  

Simulation analysis of the impact on distance protection caused by short-circuit electromagnetic transient process

作　　者：张丽丽[1] 王新超[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061

出　　处：《电力系统保护与控制》2011年第2期35-39,共5页Power System Protection and Control

摘　　要：以消除短路电压、电流中的非工频分量对距离保护的影响为目的,利用Matlab/Simulink搭建了输电线路接地距离保护的仿真模型,针对短路后电磁暂态过程对距离保护的影响进行了仿真。仿真结果表明,短路的电磁暂态过程影响距离保护元件的动作行为,导致错误的比相结果,造成距离保护元件的不正确工作。另外,故障类型、故障角、故障位置的不同对距离保护元件的影响程度也不同。滤除短路电压、电流中的非工频分量可有效地减小电磁暂态过程对基于工频量的距离保护的影响,采用FIR数字滤波器进行滤波,基本达到了满意的效果。In order to eliminate the impact on distance protection caused by the non-frequency component of short-circuit voltage and current,the ground distance protection simulation model of transmission line is built using Matlab/Simulink,and the simulation of the impact on distance protection caused by electromagnetic transient of short-circuit is conducted.Results show that electromagnetic transient of short-circuit affects the operation behavior of distance protection components,which may lead to erroneous results and may cause distance protection components work incorrectly.In addition,the influence on distance protection components caused by different fault types,fault angles and fault locations are also different. Filtering the non-frequency component of short-circuit voltage and current can effectively reduce the impact on the distance protection caused by electromagnetic transient process.In this paper,FIR digital filter is used and the result is satisfactory.

关 键 词：电磁暂态过程 距离保护 MATLAB/SIMULINK 短路故障 数字滤波 

分 类 号：TM773[电气工程—电力系统及自动化]