适用于微机保护的对称与不对称快速小波变换  

Symmetric and assymmetric fast wavelet transformation suitable for personal computer protection

作　　者：孙弢[1] 陆广香[1] 沈国荣[1] 

机构地区：[1]东南大学电气工程系,江苏南京210096

出　　处：《黑龙江电力》2004年第1期23-26,共4页Heilongjiang Electric Power

摘　　要：小波变换是时间和频率的变换,能有效地从信号中提取信息,解决了傅氏变换不能解决的许多难题。通过傅氏变换、Z变换、卷积定理等严格的数学推导,提出了多种适合于微机保护实时运算的小波基函数,并对不接地系统接地电流进行了小波分解,在工程应用上具有实际意义。Wavelet transformation is transformation of time and frequency,and can extract information from signals and solve many problems that Fourier transformation can not solve.Different kinds of wavelet based functions suitable for PC protection real-time operation were developed through stringent mathematic derivations,such as Fourier transformation,Z transformation and cirrocumulus theorem,and wavelet analysis was made for the earthing current of the ungrounded systems.

关 键 词：小波变换 正交小波变换 中性点不接地系统 快速递归算法 接地故障 

分 类 号：O174.22[理学—数学]