微电网故障特征与保护策略研究

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1、山东科技大学硕士学位论文AbstractTheMicro—gridcombinesthedistributedgenerators、Ⅳitlltheloads，theenergystoragedevices，thecontroldevicesandtheprotectivedevices．Takenasawhole，theMicro—gadmakeupanindividualandcontrollableunitofthedistributednetwork．However,astheutilizationofthedistributedg

2、eneratorsincreases，theeffecttothedistributednetworkcausedbytheconnectionofdistributedgeneratorsintheMicro—gridbecomesmoresevere，onaccountofchangingthetopologicalstructureofthedistributednetworksystem．Thefaultcharacteristicsbecomesmorecomplicated，SOthetraditionalrelayprotec

3、tionprinciplesandfaultdetectionapproachesarenolongerapplied．Thereforeitisnecessarytostudyvariouskindsoffaultcharacteristicsandcorrespondingprotectionstrategyunderthedifferentconditionsofmicrosourcetype，operationmodeandsystemstructure．Inthispaper,thefaultcharacteristicsofMi

4、cro—gridinthegrid-connectedmodeandtheislandmodeareanalyzedindetail，respectively．AconclusionisobtainedthatthemagnitudeanddirectionoffaultcurrentsCanbeinfluencedbythedifferentconnectinglocmionsandfailurepointsoftheMicro—grid．Basedontheelectricquantityvariationincaseoffailure

5、，amuchimprovedprotectionstrategyoftheMicro—gridisproposed．Theimprovementincludedthefollowing：improvingtransmissionlineprotectiononthebasisoftraditionaldifferentialprotection；usinglowvoltageprotectionaimforprotectingthemicroresources；adoptingnegativesequencecurrentprotectio

6、nandovercurrentprotectiontorealizetheessentialloadprotection．Meanwhile，amodelisbuilttovalidatethestrategythroughPSCAD／EMTDCsimulation．FinallytheoperatingmodeandswitchingprocessoftheMicro—gadarebrieflyintroduced．Keyword：Micro-grid，Faultanalysis，Protectionstrategy,Operatingm

7、ode山东科技大学硕士学位论文目录1绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。11．1课题背景与研究意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．2研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．3论文的主要内容⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．62微电网模型及故障特征⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．72．1微电源及其等效模型⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．72．2微电源的控制方式⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

8、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．92．3微电网的建模⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯132．4微电网的故障特征分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯