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ID:33009402
大小:2.42 MB
页数:68页
时间:2019-02-19
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1、浙江大学硕士学位论文ABSTRACTFromthetimewhenthefirstUHVACsingle—circuittransmissionlinewasputintooperation,ChinahasaccumulatedalotofexperienceinUHVACtransmissionsystem.But,therestillexistssomeproblemsaboutovervoltagesofUHVACtransmissionsystem,especiallyforUHVAClong-distancetransmiss
2、ionlines.Thispapermainlydiscussaboutsingle-phasegroundingovervoltageandveryfasttransientovervoltageofUHVACtransmissionsystem.Withtheincreasinglyrapidgrowthofpowerload,thepresentmainnetworkofourcountryhasbeenunabletocopewiththemultipliedtransmissioncapacityneeds.Theestabli
3、shmentofUHVpowergridhasbeentheinevitabledevelopingdirectionoftheelectricpowerindustry.UHVtransmission’Slargecapacity,rechargeablepower,andlongdistancecancausehighpowerfrequencyover-voltage,whichseriouslyaffectingthereliabilityoftransmission.Therefore.thestudyofUHVtransmis
4、sionlinepowerfrequencyover-voltagehassignificanceonthedesignandconstructionofUHVtransmissions.AstoUHVAClong-distancetransmissionlines,single-phaseovervoltagecannotbeignored.Basedontheruleoftheeffectofsource’Simpdedanceonsingle-phasegroundingovervoltage,amethodtogetthemaxi
5、mumvalueoftheovervoltageisputforward.Onthisbasis,therestrictionmethodsofthisovervoltageisstudied.Resultsshowthatallocationofthecompensationcapacityofhighvoltage(HV)shuntreactorsandMOAatthesametimecanlimitovervoltageeffectively.Besides,withthislimitationmethod,thispaperdis
6、cussesthemaximumlengthofUHVAClineswhentheamplitudeofthisovervoltagedoesnotexceed1.7p.Uunderdifferenttypesofline—segment.Resultsshowthatastothelinesthataredividedintothreesegments,themaximumlengthoftheselinescanreach1300kmwhentheamplitudeofthisovervoltagedoesnotexceed1.7p.
7、u;themaximumlengthcanreach1400kmand1600kmrespectivelywhenthelinesaredividedintofoursegmentsandfivesegments.III浙江大学硕士学位论文Inl000kVGISsubstationsorpowerplants,VFTOposesabigthreattothelongitudinalinsulationofpowertransformersbecauseofitssteepwavefront.Throughexperimentandsimu
8、lation,wediscussedtheeffectoftheoverheadlinebetweentheGISbushingandthetransformeronthewavefronts
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