1、華北電力大學(xué)（保定）碩士學(xué)位論文過電壓監(jiān)測系統(tǒng)的寬頻建模與數(shù)值計(jì)算方法研究姓名：唐帥申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電氣工程；高電壓與絕緣技術(shù)指導(dǎo)教師：張重遠(yuǎn)201103華北電力大學(xué)碩士學(xué)位論文IIAbstractInthemodernpowersystemsthephenomenonofovervoltageoftenoccursbecauseofthelightningstrikefailureresonanceswitchingopera

2、tionetc.Assoonasrunningacrosstheovervoltagetheelectricalequipmentsduringoperationarelikelytogeneratebreakdowndisgeflashoverexplosionaccidentsoon.Theseaccidentscausenotonlyeconomiclossofpowercompaniesbutalsoseriouseffecto

3、nthesecuritystabilityofthepowerwk.Therefemonitingthechangeoftheovervoltageofthepowersystemisofgreatimptancetoensurethesecuritystabilityofthepowerwk.Howevertherearelimitationsoftheexistingonlineovervoltagemonitingdevicesi

4、nthemodernpowersystems.ContraposingthisproblemthispaperpresentsanewmethodfonlineovervoltagemonitingbasedontheTparametersofthedevicesinthesubstationwhichcouldconquertheabovecertainlimitations.Thismethodmodeledthepotential

5、transfmer(PT)secondarycablesvoltagedividerasseveraltwoptwksincade.AdoptionofthisTparametersmodeltheovervoltageofthehighvoltageptofthePTwasderivedinverselyfromthevoltagesignalofthesecondarydevicebymeansofspecificnumerical

6、calculationmethodssuchasNumericalInverseLaplaceTransfm(NILT)timedomainrecursiveconvolution(TDRC).ApplyingtheprincipletheovervoltageonlinemonitingsystemwasputupinthelabatythetwopttransmissionparametersmodelofthePTsecondar

7、ycablesvoltagedividerwasbuiltbasedonthefrequencydomainmeasurements.ThroughtheanalysisoffrequencydomainmeasurementdataofsecondarycablesvoltagedividerthecadingmodelofPTsecondarycablesvoltagedividerwassimplified.BymeansofNI

8、LTTDRCtheovervoltagewascalculatedthesimplifiedmodelwasvalidated.IntheapplicationofNILTthisarticleusedVectFittinginsteadofPadeapproximationtoapproximatethepartialfractionsummationoftheexponentialfunctionwhichcouldsimplify

9、theacquisitionofthepolesresidue.AtthesametimeamethodinallusiontothearbitrarywavefmssourcefusingNILTwasproposedinthestudywhichcouldconquerthelimitationofthesourceinapplicationtoNILT.Throughtheanalysisoffrequencydomainmeas