含微网的配电系统继电保护-研究

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1、华中科技大学硕士学位论文ABSTRACTNowadays,theproblemsofenvironmentandenergybecomemoreandmoreprominent,thedevelopmentofcleanandrenewableenergyresourceshasbecomeanimportantstrategyforsustainableeconomicandsocialdevelopment.Themicro-gridhasbeenpaidmoreandmoreattentionallovertheworldforitcanred

2、ucethefeederloss,increaselocalpowersupplyreliabilityandimprovetheefficiencyofenergyuse.However,theaccessofmicro-gridwithanumberofdistributedgeneration（DG）andenergystoragewillchangethecharacteristicsofthedistributionsystemfailure.Thechangeofcurrentafterfaultwillbecomeverycomplex

3、andmaycausethetraditionalprotectioncan’tjudgelocationofthefaultaccurately.Sothereconfigurationofdistributionsystemprotectionisthekeyofmicro-gridapplications.Themicro-gridconsistsofdistributedgeneration,load,energystoragedevicesandcontroldevice.Itcanworkinbothgrid-connectedandgr

4、id-isolatedmode.First,thispaperanalyzesthecontrolmodeofmicro-gridandthecontrolmodeofDGinverteringrid-connectedandgrid-isolatedoperationmode.EachDGinverterinmicro-gridgenerallyadoptstheP/Qcontrolmodeingrid-connectedmode.Whenit’singrid-isolatedmode,oneorafewDGsareneededtoadoptU/f

5、andDroopcontrolstrategyformicro-gridmustmaintaintheratingsofvoltageandfrequency.ThentheequivalentmodelofinverterDGingrid-connectedmodeisestablished.Thesimulationmodelofdistributionsystemwithmicro-gridinPSCAD/EMTDCisestablishedbasedontheanalysisofdistributionnetworkstructureandp

6、rotectionconfiguration.ThenonthebasisoftheanalysisofDGfaultcharacteristics,theeffectofmicro-gridontheconventionalrelayprotectionofdistributionnetworkisanalyzedindetail,includingtheprotectionmaloperation,refusingtooperate,thedecreaseofsensitivityandtheeffectsofreclosureetc..Fina

7、lly,aschemeofrelayprotectionbasedoncommunicationconsideringthereclosingdeviceisproposed.Atlast，usethesimulationmodelinPSCAD/EMTDCtovalidatethenewschemeoftherelayprotection.Keywords：micro-grid;distributedgeneration;distributionsystem;relayprotectionII万方数据华中科技大学硕士学位论文目录摘要........

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