关于微电网保护的研究

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

2、multipleloadstructure．Itchangsmagnitudeoftheshort—circuitcurrentandthedirectionsofthepowerflow,eventhepowerflowsintwodifferentdirectionsinsomelines．Thesechangeshavebroughttremendousimpacttotherelayprotection．Microgridcombinesthedistributedpowerandthecon

3、troltechnologiestoimprovethereliabilityandqualityofthepower．Howevcr,theoutputcharacteristicsofthedistributedpowersupplyisdifferentfromthetraditionaldistributionnetwork，andthereforetheprotectionofthemicro—gridandthetraditionalgridaredifferent．Sohowtoensu

4、retheselectivity,sensitivity，rapidityandreliabilityofthemicro—networkprotectionisachallengeforUS．Researchonfaultcharacteristicsofdistributedpowerisparticularlyimportantfortheprotectionofmicro-grid，ithasagreattheoreticalvalueandsignificance．Thispaperdesc

5、ribesthetypesofdistributedpoweranditscontroltechnology,andthenstudythefailurecharacteristicswhenthemicro—gridhassingle-phaseshortcircuit，two-phaseorthree-phaseshort-circuitunderislandingoperationandnetworkoperation．Sowecandrawtheconclusionthatwhenmicro—

6、gridisontheislandingoperation，faultcurrentismuchsmallerthanonthenetandfalloftheDGvoltageisveryobvious，andwhenmicro—gridisonthenet，faultcurrentismuchlargeandvoltagedeclineofDGisrelativelysmall．Accordingtomicro—gridshortcircuitfaultcharacteristics，themicr

7、o—gridapplytheprotectionofthetraditionalthree—stageundernetwork，andinthecaseoftheislandingoperationusethelowvoltageprotectionasasupplementaryprotection，SOthattheprotectivedevicecanstartproperly，howevernetworkoperationorislandingoperationtoensurethenorma

8、loperationofthemicro—gridsystem．Thenthemicro一鲥dmodelwhichapplythemaster-slavepowersupplycontroltechnology,simulatesavarietyoffaulttypes，combinedwiththeoreticalanalysisandsimulation，theconclusionsshowthatnomatterwhatkindofmicro．gr