电力系统谐波间谐波的在线检测

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1、湖南大学硕士学位论文电力系统谐波间谐波的在线检测姓名：李加升申请学位级别：硕士专业：电路与系统指导教师：戴瑜兴20090325硕Ij学位论文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