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ID:32191519
大小:2.16 MB
页数:68页
时间:2019-02-01
《配电网消弧柜接地系统运行控制技术分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、ABSTRACTIndistributionnetworks,70percentofthefaultsaresingle—phasegroundingfaultsandmostofthemaretransientarcgroundingfaults.Inordertoeliminatethearcover-voltage,theneutralpointgroundmethodwitharcsuppressioncoilisadopted.Withtheexpansionofthedistribut
2、ionnetworkscale,capacitivecurrenthasgreatlyincreased.Whenthegroundingfaultoccurs,thecapacityofarc—suppressioncoilmustbeincreasedtocompensatethegroundingpointcurrent.Thecostissignificantlyraised.However,arc.overvoltagesuppressorcostslessandisnotaffecte
3、dbygroundcurrent.Andcomplicatetrackingandcompensationcalculationofcapacitivecurrentcanbeleaveout.Inparticular,whenthefaultshappenintransformerandhigh—voltagemotor,arc—overvoltagesuppressorisoperatedwhichwillbringaboutshortcircuitofthetransformerintern
4、alwindings.Anoperationcontroltheoryisproposedinthethesistosolvetheapplyingproblemofarc—overvoltagesuppressortechnologyexistinginlowandmediumvoltagedistributionnetworks.Bycombiningwiththeadvantagesforthesetwofaultrecognitiontechnologyandadoptinginforma
5、tionfusiontechnologytocompensatetheweaknessofthetwodifferentfaults,theoperationandcontroltechniquesisproposedbeforetheactionofarc—overvoltagesuppressor.Consideringabouttheeffectsofasymmetricsystem,allkindsofdisturbancesandtheprobablewrongrecognitionma
6、kingthearc—overvoltagesuppressoract,thesequencecurrentinthewholesystemshouldbeanalyzedfordifferentfaultsaftertheactionofarc-overvoltagesuppressortomakesurewhethertheaetioniSrightornot.Thenthearc—overvoltagesuppressorcanbeproperlycontrolled.Thedamageac
7、cidenceofthetransformerwillbeavoidedinarc—overvoltagesuppressorgroundedpowersystem·Theproposednovelarc-overvoltagesuppressoroperationcontroltheorycaneffectivelyidentifysingle—phasegroundingfaults,transformerinternalfaultsandloadtransformerinternalfaul
8、ts.Thearcover—voltagesuppressorandtransformerprotectionarecontrolledtOwork.Transformerburningresultingfromwrongoperationofarcover.voltagesuppressorisavoided.ItisverifiedbyMATLABandEMTPsimulation.KeyWords:DistributionNetwork:Arc—overvoltageSupp
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