輸電線路行波故障測(cè)距中雷擊及相關(guān)問題研究.pdf

1、東南大學(xué)碩士學(xué)位論文輸電線路行波故障測(cè)距中雷擊及相關(guān)問題研究姓名：饒曙勇申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電氣工程指導(dǎo)教師：盧毅20120512ABSTRACTCurrentlythetechnologyoftransmissionlinesfaultlocationbasedontravelingwavetheoryhasbeengraduallydevelopedandwidelyusedinpowersystemConsideringthe

2、factthatthetravelingwavefaultlocationdevicemaydrawthewrongjudgmentduetothelackofabilitytoidentifylightningstroke，usingappropriatemethodstodistinguishbetweenthelightningstrokelinesandshortcircuitfaulteffectivelyisveryimpo

3、rtantThesemethodswillhelptheoperationpersonneltOdeterminethetypeoflinesfaultquicklyandthentotakeappropriatemeasurestoaccuratelylocatethefaultpointaccuratelyassoonaspossible，whichhasgreatsignificancetoimprovethestabilityo

4、fpowersystemandreducetheworkintensityofthelinepatrolofficersInthispapertheidentificationoflightningstokeandthelocationoffaultpointinthetransmissionlinetravelingwavefaultlocationarediscussedindepthandthemaincontentsare髂fo

5、llows：(1)ThebasicprinciplesofthetravelingwavefaultlocationaleintroducedTheimpactoflightningstrokeonthereliabilityandaccuracyoftravelingwavefaultlocationhasalsobeenanalyzedThenseveraltypicallightningstrokeidentificationme

6、thodarediscussedandcompared(2)Astwotypicalsignalprocessingmethods，thetheoriesofwavelettransformandempiricalmodedecomposition(EMD)arediscussedBasedontheoryofEMD，animprovedEEMDmethodisproposedBysuperimposingcouplesofwhiten

7、oisewithoppositesign011thesignalbeforeEMDdecompositionthismethodnotonlyinheritstheadvantageofEEMD，butalsocaneliminatetheresidualwhitenoisequicklySO瓠tOimprovethedecompositionresultsInthispapertheimprovedEEMDmethodisusedfo

8、rtravelingwavesignaldenoisingandisprovedtobefeasiblebycomparisonwiththewaveletthresholdingmethod(3)ThelightningstrokeidentificationmethodoftransmissionlinetravelingwavefaultlocationisstudiedThroughanalysisingthetransient

9、voltagetravelingwavepropertiesofinductionlightning，directlightn／ngstrokeandshortcircuitfaultbyusingwavelettransformandimproveEEMDmethod，thetransientcharacteristicsoftravelingwaveareextractedfromthetimedomainwaveformtheca

10、tadioptricprocessesandtheIbtFenergydistributionOnthisbasis，theidentificationmethodisproposedanditseffectivenessisverifiedviaEMTPsimulationFortherealityofengineering，adetailedresearchontheanti—interferenceabilityofrecogni

11、tionalgorithmhasalsebeendone(4)Fortravelingwavefaultlocationoftransmissionlineunderlightningstrokefault，thelocationoflightningpointandshortcircuitpointwhichareinconsistentisemphaticallydiscussedFromthethetwoaspectsofthet

12、ravelingwavecatadioptricprocessandthewaveformproperties，thetransientcharacteristicsoftravelingwavearefirstlyanalizedthusthealgorithmfordeterminingwhetherthelightningpointandshort—circuitpointarethesameornotisputforwartAt

13、lastthecorrespondingtwogroupsofformulaforlocatingalegivenandthecompletealgorithmstepsaredevelopedaswellAttheendofthispapertheaccuracyofthelocatingalgorithmisverifledMeanwhilethecausesoftheelTOraleanalyzedKeywords：transmi