資源描述：
《電力系統(tǒng)諧波間諧波的在線檢測(cè)》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、湖南大學(xué)碩士學(xué)位論文電力系統(tǒng)諧波間諧波的在線檢測(cè)姓名：李加升申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：電路與系統(tǒng)指導(dǎo)教師：戴瑜興20090325碩Ij學(xué)位論文AbstractTheon·-linedetectionofharmonicandinter·—harmonicinpowersystemiscutting—edgetechnologyandhotresearchtopicinpowerqualityresearcharea．Inthispaper，harmonicpoweroftheinter—harmonicdetection
2、coreissuedown”inter—harmonicharmonicpreprocessing(denoising)?HarmonicDetection?DetectInter-harmonics?powerharmonicsdetectiondevicethedesignof”themainlineofthistechnology，theuseofwavelettransformtheory，fastFouriertransformtheory，interpolationtheory，bimodalspectri
3、amamendmenttheory，inter-harmonicnoisepower’harmonics，harmonicdetection，inter—harmonicdetection，harmonicpowerdevicedesignsystems．First，thetraditionaldenoisingalgorithmisbasedmainlyontheWienerfilterlinearleastsquaresmethodatthesametimehigh—frequencynoise，butleasts
4、quaresisalsosomeusefulinformationforfaultdiagnosisofhigh·frequencydisadvantage，andbasedOnwaveletTransformnon—lineardenoisingalgorithmcanovercomethisdisadvantage，athresholdbasedonacustomfunctiondenoisingalgorithmandthealgorithm—basedde—noisingeffectHardThresh，Sof
5、tThreshfunctioncomparativestudyofalgorithms．Simulationandexperimentalresultsshowthatthresholdbasedonaeustomfunctionofwaveletdenoisingalgorithminpowerqualityharmonicinter-harmonicsdetectioniseffective．Second，addawindowbasedonFastFourierinterpolationalgorithmerror
6、characteristicsofthepowergridthroughtheestimationofthefundamentalfrequency，andthenusethisintegermultipleofthebasebandsamplingfrequencyofthegridcontainingharmonicsignalsPlesiochronoussampling，re—useFastFourierTransformtoestimatetheharmonicparameters．Theproposedne
7、wmethodofsimulation，simulationresultscanbeadequatelydemonstratedthatthemethodofmeasurementaccuracyisbetterthanwindowsaddtheFastFourierinterpolationalgorithm，duringthequasi-synchronoussamplingcanbereducedwhenthesamplingperiod，andfurtherimprovethealgorithmreal-tim
8、e．Meanwhileelectricpowersysteminaccordancewiththecharacteristicsofinter-harmonics，basedonthebimodalspectrumoftheamendmenttheory．proposedanewalgorithm=”elimination”toc
