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电力系统暂态信号分析中小波基的选择原则
引用本文:何正友,钱清泉.电力系统暂态信号分析中小波基的选择原则[J].电力系统自动化,2003,27(10):45-48,76.
作者姓名:何正友  钱清泉
作者单位:西南交通大学电气自动化研究所,四川省成都市,610031
基金项目:国家自然科学基金资助项目 (5 99770 1 9),四川省应用基础研究基金资助项目 (0 2 GY0 2 9- 0 39)~~
摘    要:讨论了电力系统中常见的暂态信号分析应用,如电力暂态信号检测、去噪与数据压缩以及暂态信号定位等,对这些应用中小波基的选择原则进行了系统的分析研究。研究结果表明,具有高阶奇异性的电力暂态信号必须选择具有相当消失矩的小波基;低频载波中检测弱暂态,应尽量选择中心频率较高的小波基;窄带干扰中提取暂态信号,应选择过渡带窄工具有良好分频能力的高阶小波;去噪、滤波和数据压缩方面,B系列小波具有更好的噪声抑制能力;电力系统故障暂态信号与峰值突变更接近,因此,在暂态信号定位时,一般应选择对称小波对故障暂态信号定位。应用中除选择恰当的小波基外,应根据被分析信号选择合适的分析尺度。

关 键 词:电力系统  暂态信号分析  小波基  小波变换  傅里叶变换
收稿时间:1/1/1900 12:00:00 AM
修稿时间:1/1/1900 12:00:00 AM

MOTHER WAVELET OPTION METHOD IN THE TRANSIENT SIGNAL ANALYSIS OF ELECTRIC POWER SYSTEMS
He Zhengyou,Qian Qingquan.MOTHER WAVELET OPTION METHOD IN THE TRANSIENT SIGNAL ANALYSIS OF ELECTRIC POWER SYSTEMS[J].Automation of Electric Power Systems,2003,27(10):45-48,76.
Authors:He Zhengyou  Qian Qingquan
Abstract:This paper discusses some common issues in the applications of transient signal analysis, such as transient signal detection, de noise, data compression and locating. The mother wavelet option method is studied. The study gives the following results: (1) To detect the high order singularity transients, the high order vanish moment wavelet must be chosen; (2) To detect the feebleness transients implied in low frequency carrier signals, the low center frequency wavelet must be chosen; (3) To detect transient signals from the narrow channel disturb signals, the wavelet which has good time frequency capabilities must be chosen; (4) In the application of transient signals de noise and data compress, the B spline wavelet is a better selection; (5) To locate the transient, the symmetry wavelet is a better selection. In addition, the wavelet scales must be taken into account in engineering applications.
Keywords:wavelettransform  motherwavelet  transientsignal  waveletscale  signallocating
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