基于諧波分析法的MOA在線監(jiān)測數(shù)學(xué)模型的研究.pdf

1、河海大學(xué)碩士學(xué)位論文基于諧波分析法的MOA在線監(jiān)測數(shù)學(xué)模型的研究姓名：胡道明申請學(xué)位級別：碩士專業(yè)：電力系統(tǒng)及其自動化指導(dǎo)教師：潘文霞20050301ABSTRCTneMetalZnOArrester(MOA)areimportantover—voltageprotectiondeviceTheyarewidelyusedinelectricpowersystemduetotheirexcellentnonlinearandhighsu

2、rgeabsorbingcapabilityButsomeofMOAwilldeteriorategraduallyunderoperatingvoltageandsomeofthemwillbemoistenendbecauseofstructureproblemsThetwofaultscanleadtoincreasingofleakagecurrentofthearresters，eventoaccidentofpowersys

3、temwhentheyaresevereResistivefirst—harmoniccurrentandhigh—harmoniccurrentarethetwofaulteigenvectorreflectingMOAsperformanceMesurementcann’treflectMOA，srealstatebecauseoftheeffectofinterphaseinterferenceandharmonicsinclud

4、inginterharmonicsaMOAsmodelmonitoringon—lineisestablishedtoeliminatingtheeffectofthetwointerfefencesourcesInthispaperbasedonformerproduction，theeffectsofinterphaseinterferenceandharmonicstoMOAsresistireleakagecurrentares

5、imulinkedandvalidatedbyusingMatlabBecauseofwideusingofmanyelectrondevicesTheeffectsofinterharmonicsshouldnotbeignoredThesimulationhasbeenmadetofindafewinterharmorticsleadtobiggisherrorsduringdetectingMOAInthispaperbasedo

6、nharmonicsanalyticmethodandvectoranalyticmethod，voltageandcurrentfiguresareplotonfirst—harmonicandthird—harmonicandfifthharmonic，eliminatingeffectsofinterphaseinterferenceandharmonics，includinginterharmonicsMOAsmodelmoni

7、toringon—lineisthenbuiltByusingthemodel，thetwofaulteigenvectorcanbefiguredduringMOAsoperationFinallythispaperdemonstratesthemodelontheorybyusinganexampleandpolyfitaverageUIcharacteristiccurveofMOAwiththeresultsBycomparin

8、gwiththeaverageUIcharacteristiccurveoftheexamplewefindthatthemodelisfeasibleontheoryandwecanbringitintothenetworksystemmonitoringonlineWearesurethatthemodelwillplayagreatroleintheconditionbasedmaintenanceKEYWORDS：MOA，res