关于微电网保护的-研究

《关于微电网保护的-研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、万方数据AbstractAbs仃actInrecentyears，withthedevelopmentofdistributedgenerationtechnology,moreandmoreapplicationsofthemicro-gridhavecomeintoourlife．Distributedpowersupplychangesthenetworkofpowergridfromthestructureofasinglesupplynetworkstothemultiplepowerandmultipleloadstructure．Itchangsmagnitudeoft

2、heshort—circuitcurrentandthedirectionsofthepowerflow,eventhepowerflowsintwodifferentdirectionsinsomelines．Thesechangeshavebroughttremendousimpacttotherelayprotection．Microgridcombinesthedistributedpowerandthecontroltechnologiestoimprovethereliabilityandqualityofthepower．Howevcr,theoutputcharact

3、eristicsofthedistributedpowersupplyisdifferentfromthetraditionaldistributionnetwork，andthereforetheprotectionofthemicro—gridandthetraditionalgridaredifferent．Sohowtoensuretheselectivity,sensitivity，rapidityandreliabilityofthemicro—networkprotectionisachallengeforUS．Researchonfaultcharacteristic

4、sofdistributedpowerisparticularlyimportantfortheprotectionofmicro-grid，ithasagreattheoreticalvalueandsignificance．Thispaperdescribesthetypesofdistributedpoweranditscontroltechnology,andthenstudythefailurecharacteristicswhenthemicro—gridhassingle-phaseshortcircuit，two-phaseorthree-phaseshort-cir

5、cuitunderislandingoperationandnetworkoperation．Sowecandrawtheconclusionthatwhenmicro—gridisontheislandingoperation，faultcurrentismuchsmallerthanonthenetandfalloftheDGvoltageisveryobvious，andwhenmicro—gridisonthenet，faultcurrentismuchlargeandvoltagedeclineofDGisrelativelysmall．Accordingtomicro—g

6、ridshortcircuitfaultcharacteristics，themicro—gridapplytheprotectionofthetraditionalthree—stageundernetwork，andinthecaseoftheislandingoperationusethelowvoltageprotectionasasupplementaryprotection，SOthattheprotectivedevicecanstartproperly，howevernetworkoperationorislandingoperationtoensurethenorm

7、aloperationofthemicro—gridsystem．Thenthemicro一鲥dmodelwhichapplythemaster-slavepowersupplycontroltechnology,simulatesavarietyoffaulttypes，combinedwiththeoreticalanalysisandsimulation，theconclusionsshowthatnomatterwhatkindofmicro．gr