摘要
输电线路的阻抗保护对于电力系统安全稳定运行具有重要的意义,对输电线路采取了R-L模型的等效方式。R-L模型算法可以不用将非周期分量滤除,所以算法的总时间窗较短;而且它不受电网频率变化的影响,所以在线路距离保护中得到了广泛应用。在simulink中搭建了一典型的输电模型,并在matlab中利用差分方程实现了在线计算线路短路阻抗值,验证了该模型算法的有效性。
The resistance protection of the transmission lines is of great significance to the safe and stable operation of the power system,this paper adopts the R- L model as the equivalent of transmission lines. The total time of the R- L algorithm is relatively short since the aperiodic component can not be filtered,and it can＇t be affected by changes in frequency,so it is widely used in line distance protection. This paper built a typical transmission model in Simulink,and realize the online calculation of short circuit resistance value in the MATLAB by using differential equations,which verify the effectiveness of the R- L model algorithm.
出处
《电气开关》
2016年第1期41-44,共4页
Electric Switchgear
关键词
R-L模型
距离保护
差分方程
短路阻抗
R-L model
distance protection
differential equations
short circuit resistance
