电力系统大扰动对汽轮发电机组轴系扭振影响的研究

上海交通大学硕士学位论文电力系统大扰动对汽轮发电机组轴系扭振影响的研究姓名：周敏申请学位级别：硕士专业：电气工程指导教师：王西田;陈陈20080101-III-2070(1)MANDISP2007VisualStudio.NetMANDISP2007MANDISP2007600MW(2)600MWMANDISPPH0975-IV-(3)PSCAD/EMTDCMANDISP(HVDC)EMTDCEMTDC7EMTDCEMTDC-V-STUDYONIMPACTOFELECTRICALSYSTEMLARGEDISTURBANCESONTURBINE-GENERATORSHAFTTORSIONALOSCILLATIONABSTRACTAsthedevelopmentofthepowerindustry,thegeneratorunithaslargercapacityandtheshaftbecomesmoreflexible,alsotheinterconnectedpowergirdishugerandmorecomplicated,whichmakethetorsionaloscillationproblembetweentheunitandgridmoreandmorenotable.Thetorsionaloscillationproblemwillmaketheshaftendurebigtorquetimeandagain,whichproducesthefatiguelifelossandevenmakestheshaftbroken.Sincethe1970s,manyinternalandoverseasshaftaccidentshappened,andgreatlosshasbeenbrought.Thetorsionaloscillationisconsideredasanimportantproblemforthepowersystemsafety,andshouldbeenstudiedandresolved.Thisthesisisfocusedontheimpactofelectricalsystemlargedisturbancesonturbine-generatorshafttorsionaloscillation.Themainworkisasfollows:(1)AprofessionalprogramMANDISP2007isdevelopedtostudytheshafttorsionaloscillationandfatiguelossproblem.UsetheVisualStudio.NettodevelopthenewversionprogramMANDISP2007version.ThentoevaluatetheDongfangTuibineGeneratorCompany600MWaircoolingturbinegenerator’sshafttorsionaloscillationcharacteristic,simulatethetransienttorqueandfigureoutthefatigueloss.Alltheseresultswillbethemanufacturer’sturbinegeneratortechnicalspecification.(2)Duringthecalculationandevaluation,somefaultswillleadtogreatimpactontheshaft.Sothispartofthethesiswillanalyzethedetailoftwotypicaldisturbances.Usethesynchronousmotorequationstocalculateelectromagnetictorqueequationsduringthefaultysynchronizingandthree-phaseshortcircuitnearthepowerstation.Thenusethe-VI-MANDISP2007simulationresultstocomparewiththeequationsresults.Alsomanyturbine-generatormanufacturersareusingthePH0975programtoevaluatetheshafttorsionaloscillation.InPH0975program,theelectricalandmechanicalpartsaredivided.Sobeforethesimulation,theuserneedstoprovidetheelectromagnetictorqueequationsforthedifferentelectricaldisturbances.ThentheresultsofthispartcanalsohelpthemtousePH0975program.(3)InPSCAD/EMTDC,aself-definedshaftmodelisdevelopedbasedonthemodedepressionmethod,thenaSCsystemfaultissimulatedtoanalysetheshaftfatigue.AsthecurrentversionMANDISPdoesn’thavesomeelectricalequipmentmodels(suchasSCandHVDC),andnowcanonlyconsideronedetailedshaftmodel,bothofwhichmakethisprogramcan’tbeusedinsomecomplicatedsimulations.SothispartwillproposeanewmethodbasedontheEMTDCtoanalyzethetorsionaloscillationproblem.SincetheEMTDConlyhasthe7massesshaftmodel,usetheuserModuletodevelopadetailedshaftmodel.Themethodisbasedonthemodetransferandmodedepression,andcanconsiderthehundredsofsections.Alsoafatiguelossprogramisdevelopedtoevaluateeachfault’sfatigueloss.ThenweusethismethodtoresearcharealSCpowersystem’sshafttorsionaloscillationproblem.Keywords:PowerSystemTurbine-GeneratorShaftTorsionalOscillationLargeDisturbanceFatigueLoss-I-2008219-II-___3(“3”)20082192008219-1-1.11.1.119701971Mohave483/426MW20801984200MW12198450MW1985200MW51988200MW131985900MW-2-600MW900MW1.1.2Mohave2070KWUSCFSFCSSRHSR[11]IEEE[12,13]CIGRE11.011992[14]1990[15]-3-[16]MANDISP300MW600MW[17][18][19][20][21][3](1)[4]HVDCHVDC(2)(SubsynchronousResonance,SSR)[5](SubsynchronousOscillationSSO)(HVDC)[6]-4-[78]1.2EMTPNETOMACEMTDC[9-11]()PH0975()()90-MANDISP(MachineAndNetworkDigitalSimulationProgram)DOS[12]STOFLEPMANDISP300MW600MW[1213]-5-MANDISPDOSWindowsWindowsMANDISPWindowsMANDISP600MWPH0975MANDISPMANDISPHVDCMANDISPMANDISPMANDISPPSCAD/EMTDCEMTDCEMTDC-6-1.320702070Mohave790MW2080(CIGRE)KWU[14]CIGRE11.01()1992[15]1990()[16]1.3.1()(50Hz)(1)45HzH155Hz93HzH2108Hz(2)()H1H2-7-200~3001.3.21-1KWUTable1-1KWUabouttheshafttorsionaloscillationfatigueresultsforeachdisturbanceKWU1-1-8-()100%KWU1-380%20%1-2KWUTable1-2KWUaboutthestandardfortheimpactonshaftoftheseriousdisturbances(SC)1%3%(FS)7%20%FCT≤0.153%10%(FC)0.15≤FCT≤FCT5%15%1-3Table1-3Typicaldisturbancesassembled80%(SC)135(FS)123FCT≤0.15221713(FC)0.15≤FCT≤FCT1231.3.3(HSR)(AO)(1)()-9-()0.1%1%()(2)CIGRE0.6~0.71.4-10-MANDISP2007VisualStudio2003.NetMANDISP2007600MWPH0975MANDISPPH0975MANDISP(HVDCFACTS)EMTDCEMTDC()-11-Windows2.1MANDISP2.1.1MANDISPMANDISPSTOFLEP()MANDISPMANDISP()[17]oαβMANDISP()PSS()MANDISP500-12-90015002005003902.1.2MANDISP()(1)MANDISPPark'qE[18]Park000ddqdqqdqFFFFDDDHHHQQQdadFadDddFFFFDDaddDFDFDDaddqaqQaqHqqHaqQHHaqqQQQaqHaqqUpriUpriUpripripripriXiXiXiXiXiXiXiXiXiXiXiXiXiXiXiXiXiXiψωψψωψψψψψψψψψψψ=−−=+−=+=+=+=+=+−=+−=+−=+−=+−=+−(2-1)'qE''ddqdqqdqdqddqqqUpriUpriEXiXiψωψψωψψψ=−−=+−=−=−(2-2)-13-(2)abc0αβabcabcY/-0αβ0αβabcMANDISP0αβ(3)MANDISP[19]()MANDISPi1,1,111,1,11()()()()iiiiiiiiiiiiiiiiiiiiiMpKKTDDDωθθθθωωωωω−−++−−+++−+−=−−−−−(2-3)iipωθ=(2-4)12knnT1T2TkT12K23KnnK,1−11,DM22,DMkkDM,nnDM,2-1Fig.2-1Shaftmassmodel()AXtB×=(2-5)-14-A()Xtt(iωiθ)Btt−()(7)2.1.3MANDISPMANDISP1990~1991MANDISP4111990~1991600MW16561991(AC1AC2)16561991360MVA31995300M381631997QFSN600MW1997300MW2003600MW900~1800()-15-(0.60