电网广域电流差动保护算法研究

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1、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指导教师：王晓茹20070501西南交通大学硕士研究生学位论文第1I页AbstractWiththeimplementationofdevelopmentstratagemabout“transmitelectricityfromwesttoeast，northsupportspowersupplytosouthandviceversa，connectpowergridsnationwide”，thesituationofla

2、rgescalepowergridsandlongtransmissiondistancesisanewchallengebroughtforwardforrelayingprotectionsystemandstabilitycontrolsystem，whichshouldnotonlyprotectelectricaldevicesfrombeingdamagedbyfaults，butalsoavoidpowersystemcollapsebycertainseveredisturbances．Studiesofthes

3、ignificantpowersystemblackoutsindicatethat，incertainabnormaloperationsituationsarousedbybiggerdisturbances．conventionalprotectionrelaysbasedonthelocallymeasuredinputsisofeasymisoperation．Withtherecentadvancesofcommunicationtechnology，thewideareaprotectionhasbeenpropo

4、sedasanapproachnotonlytoprotectcomponent，butalsotoimrpovesystemstability．Differentlyfromconventionalprotectionrelays，withtheacquisitionofwideareainformation，wideareaprotectionsystemscanmoreaccuratelydetectcomponentsoffaultandisolatefaultsintheirsmallestareas．Inthisdi

5、ssertation，thebackgroundandresearchsituationofthewideareaprotectionareintroduced，andvariouswideareaprotectionsystemsproposedatpresentaresummarized．Thecharacteristics，thefunctionmakingupandsystemstructuresarediscussed，andapracticalwideareaprotectionsystemschemeispropo

6、sedinthisdissertation．Theanalysisshowsthatthetraditionalcriterionofcurrentdifferentialprotectionhasthedrawbackandisnotsuitforwideareaprotectionsystem．Byimprovingtherestrainingcharacteristics，animprovedcurrentdifferentialprotectioncriterionisproposedinthisdissertation

7、．Theoryanalysisandsimulationexperimentsshowthat：theyareofthesamesecurityonexternalfaults：furthermore，the西南交通大学硕士研究生学位论文第lll页improvedhashighersensitivityandcapabilityofdetectiononthefaultswithhigherfaultresistance．Awideareacurrentdifferentialprotectionarithmeticbasedo

8、ngraphtheoryisproposedinthisdissertation．ThebasicideaisthatthetopologicalstrucVureofpowersystemisdescribedbygraphnodesandedges：them