基于离散余弦变换与小波变换的电能质量扰动信号检测方法.pdf

29! 10" #$%& Vol. 29No. 10 2005'5( PowerSystem Technology May2005 !"#$1000-3673%2005&10-0070-05 '()*#$TM714 +,-.$A /01.$470·4051 23456789:;<89= >?***@ABCD#EFGH !" 1#$%& 1#'() 2 1!"#$%&'()%*+"#,-./61006502!12&34+"#,12/6440005 DETECTIONANDANALYSISOFPOWERQUALITYDISTURBANCESIGNALBASED RANSFORMANDWAVELETTRANSFORM LIUAn-ding 1)XIAOXian-yong 1)DENGWu-jun 2 *1. SchoolofElectricalandInformation)SichuanUniversity)Chengdu 610065)SichuanProvince)China+ 2 .YibinElectricPowerBureau)Yibin 644000)SichuanProvince)China, ABSTRACT$Synthesizingrespectiveadvantagesofdiscrete ransform(DCT)andwavelettransform(WT)module maximumintimedomainanalysis,aDCTandWTbased powerqualitydisturbancesignal detectionmethodisproposed. Inthismethodfirstlythefundamentalfrequencydisturbances, includingvoltagesag,voltageswellandvoltageinterruption, andtheharmonicsindifferentordersinvolvingtransient harmonicsaredetected,thentransientoscillationandtransient pulsesaredetectedbyuseofWTmodulemaximum,andthe measurementofdurationandamplitudeofthedisturbancesare ability, and itseffectiveness isverifiedbysimulation. KEYWORDS$Powersystem+Transmissionanddistribution+ Powerquality+ransform+Time-frequency analysis+Noiserobustness+Wavelet transform+Modulemaximum IJ$-./0**********:;<=>?***@A BCDEF)GHIJK/0123456734D#LM NOPQRSTUVWXYZ/01234STH[\J@ ]O*#^_`a#^_b5#^cd,5