硕士论文-基于DSP全光纤高压电力监测系统的研究与实现

上海交通大学硕士学位论文基于DSP全光纤高压电力监测系统的研究与实现姓名：傅鸣非申请学位级别：硕士专业：信号与信息处理指导教师：耿相铭20080101DSPFaradayJonesJonesSagnacSagnacADDSPFFTFFTFaradayResearch&ApplicationofAllFiber-OpticalHigh-VoltageElectricParameterMonitoringSystemBasedonDSPABSTRACTAllFiber-OpticalCurrentTransformer(OCT)isoneofthreekindsofnew-styleelectroniccurrenttransformers.Ithaspotentialbenefitsoverconventionalcurrenttransformers(CTs)suchasinherenthigh-voltageisolation,immunitytoelectromagneticinterference,enhancementinsignalbandwidthanddynamicrange,easeofintegrationintofuturedigitalcontrolandprotectionsystemsandwillbewidelyusedinpowerelectricalsystem.Firstly,thepaperdescribestheworkprinciplesofFaradayeffectandJonesmatrixanalyzingmethodofpolarizationsystem.ThenthepaperestablishesthetheorymodelofreflectiveSagnacinterometerbasedfiber–opticalcurrenttransformerusingJonesmatrixanalyzingmethod.Secondly,thepaperanalyzestherequirementofreflectiveSagnacinterometerbasedfiber–opticalcurrenttransformer,presentsthestructureofsecondarysignalprocessingsystemanddescribesthehardwaremodelofeachpartindetail.Amongthese,thethesisemphasizestheADconversionmodelbasedonhardware-synchronizedsamplingmethodandcoremodelofDSP.Thenthepaperintroducesthesoftwaremodelofthesysteminbrief.Thirdly,thepaperstudystheharmonicwaveformmontoringmethodusingFFT,analyzestwofactorsoferrorsinharmonicwaveformanalysisusingFFTasynchronizationsamplingandpicketfenceeffectofnonetime-limitsignal.Synchronizationsamplingandwindowingtoreducetheleakageeffectarediscussed.Basedofthat,hanningwindowandhardware-synchronizedsamplingmethodarechoosedtoapplyonthesystemandthenusesinterpolatingalgorithmtofurtheradjusttheanalyzingresultofsignalwhichiswindowed.Afterthat,anewmethodusingwavelettansformtoanalyzeharmonicwaveformisdiscussed,andbaseofthat,anewmethodwhichnamedFourierandWaveletcomprehensivedetectingalgorithmusingFastFourierTransformcombiningwithWaveletTransformisdiscussed.Usingthespecialeffectondetectingsingularitypointandhighresolvingdegreeintimedomainofwavelet,combinedwiththeexactfrequencyresolvingabilityofFastFourierTransform,allkindsofharmonicwaveformcanbeanalyzed.Finally,alltypesofharmonicsignalmodelsarecreatedandemulateFFTandWavelettransformtothesesamesignalmodels.Aconclusionabouthowtousedifferentmethodscanbegotbycontrast.AndthenFourierandWaveletcomprehensivedetectingalgorithmisemulatedbyawell-formatedcompositiveharmonicsignalanditiscomparedwithrationalmethodbyemulateaswell.Theemulatingresultsaremuchbetterthantradiotionalharmonicanalysismethod’s.KEYWORDS:FaradayEffectFiber-OpticalCurrentTransformerHarmonicWaveformFFTWaveletTransform1-1·····················································································11-2······························································31-3Sagnac······················································41-4·············································································51-5FOCT·······································································62-1Faraday················································································102-2Sagnac·······································153-1···················································································183-2···············································································193-3···········································································203-4C6713························································································243-5·······························································································294-1·······························································································354-2···························································································355-1·······························································································445-2·······················································································455-3························································476-11································································································506-22································································································516-33································································································516-44································································································526-51····························536-62····························536-73····························546-84····························546-91························································556-102························································566-113························································576-124·························································586-13························································································592-1Jones..........................................................................123-1..................................