摘要
S变换是一种由小波变换及短时傅里叶变换改进后的时频分析工具,由于其良好的自适应分辨率近年来已被用于电力系统故障研究。但由于S变换运算过程存在窗函数之外的冗余运算,计算量较大,影响运算速度。为此提出了一种基于快速S变换的小电流接地方式下的故障选线新算法。利用快速S变换后各线路零序电流在特征频带内的模值进行分析选线。最后通过大量仿真算例证明了此方法能够有效地进行故障选线,正确率高,并且节省了运算时间。
S-transform is a time frequency analysis tool which is got by improving the wavelet transform and short time Fourier. It is used to study power system fault recent years due to its good adaptive resolution. However, the process of S-transform operation has redundant operation be- side the window function, affecting processing speed. Therefore, we propose a fault line identification approach based on fast S-transform in neutral un-effeetual grounded system. The fast S-transform is used to analyse each line＇ s zero-sequence current in special frequency band and select fault line. Finally, this method can effectively work by a large number of simulation examples demonstration, and have a hign correct rate with lesser computing time.
出处
《微型机与应用》
2016年第24期73-76,共4页
Microcomputer & Its Applications
关键词
小电流接地系统
时频分析
快速S变换
neutral un-effectual grounded system
time frequency analysis
fast S-transform
