摘要
系统阐述了多重分形和多重分形谱的小波局部极大模计算方法,提出了利用多重分形谱对线路的零序电流进行分析,根据谱图进行判断故障线路的新方法。采用PSCAD/EMTDC4.02软件建立一35kV配电线路模型进行仿真,仿真结果表明多重分形谱可以很好地反映故障电流信号的几何特征和奇异性,这为小电流接地系统单相接地故障选线提供了一种有效的方法,且该方法计算简单,可靠性高。
The concept of multifractal spectrum is presented systematically and the wavelet local maxima modulus based method is introduced.Focused on a resonance-grounded power system,a new method of selecting faulted line based on multifractal spectrum of the zero-sequence current is presented.A 35 kV simulational model is set up by PSCAD/EMTDC4.02.The result shows that the geometry features of a fault current signal can be reflected by multifractal spectrum,which provides an effective way for selecting faulted line on a neutral indirect grounded power system.The method is of simple calculation and reliability.
出处
《继电器》
CSCD
北大核心
2008年第7期10-14,共5页
Relay
关键词
小电流接地系统
多重分形谱
小波极大模
零序电流
故障选线
neutral indirect ground system
multifractal spectrum
wavelet local maximum modulus
zero-sequence current
selecting fault line
