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1、西南交通大学硕士研究生学位论文第I丨丨页西南交通大学硕士学位论文电网广域电流差动保护算法研究姓名：汤俊申请学位级别：硕士专业：电力系统及其自动化导教师：王晓苑20070501西南交通大学硕士研究生学位论文第I丨丨页Abstract西南交通大学硕士研究生学位论文第I丨丨页Withtheimplementationofdevelopmentstratagemabout“transmitelectricityfromwesttoeast,northsupportspowersupplytosouthandviceversa,co
2、nnectpowergridsnationwide"’thesituationoflargescalepowergridsandlongtransmissiondistancesisanewchallengebroughtforwardforrelayingprotectionsystemandstabilitycontrolsystem,whichshouldnotonlyprotectelectricaldevicesfrombeingdamagedbyfaults,butalsoavoidpowersystemcol
3、lapsebycertainseveredisturbances.Studiesofthesignificantpowersystemblackoutsindicatethat,incertainabnormaloperationsituationsarousedbybiggerdisturbances,conventionalprotectionrelaysbasedonthelocallymeasuredinputsisofeasymisoperation.Withtherecentadvancesofcommunic
4、ationtechnology,thewideareaprotectionhasbeenproposedasanapproachnotonlytoprotectcomponent,butalsotoimrpovesystemstability.Differentlyfromconventionalprotectionrelays,withtheacquisitionofwideareainformation,wideareaprotectionsystemscanmoreaccuratelydetectcomponents
5、offaultandisolatefaultsintheirsmallestareas.Inthisdissertation,thebackgroundandresearchsituationofthewideareaprotectionareintroduced,andvariouswideareaprotectionsystemsproposedatpresentaresummarized.Thecharacteristics,thefunctionmakingupandsystemstructuresarediscu
6、ssed,andapracticalwideareaprotectionsystemschemeisproposedinthisdissertation.Theanalysisshowsthatthetraditionalcriterionofcurrentdifferentialprotectionhasthedrawbackandisnotsuitforwideareaprotectionsystem.Byimprovingtherestrainingcharacteristics,animprovedcurrentd
7、ifferentialprotectioncriterionisproposedinthisdissertation.Theoryanalysisandsimulationexperimentsshowthat:theyareofthesamesecurityonexternalfaults;furthermore,the西南交通大学硕士研究生学位论文第I丨丨页improvedhashighersensitivityandcapabilityofdetectiononthefaultswithhigherfaultresi
8、stance.Awideareacurrentdifferentialprotectionarithmeticbasedongraphtheoryisproposedinthisdissertation.Thebasicideaisthatthetopologicalstructureofpowersy
