变电站毕业设计-外文翻译

山东理工大学毕业设计（外文翻译材料）学院：专业：学生姓名：指导教师：电气与电子工程学院电气工程及其自动化韦柳军孟繁玉外文翻译（译文）-1-ReliabilitymodellingandanalysisforSheffieldSubstation220kVupgradeprojectCarolineLeeTransend,NetworksPtyLtd,TasmaniaDrSudhirAgarwal,SanDiego,California,USAABSTRACTThispaperdescribestheapplicationofadefensibleprobabilisticprocessinreliabilityevaluationforSheffield220kVSubstationredevelopmentproject.SheffieldSubstationisahubof220kVtransmissionsystemintheNorthandNorth-WestregionsofTasmania.ItprovidesconnectiontoWestCoastandMerseyForthhydropowerstationsandfacilitatespowertransfersfromthesepowerstationstomajorindustrialcustomersinGeorgeTownareaandretailandindustrialloadsintheNorthandNorth-WestregionsofTasmania.Therefore,itisimportantthatintegrityofSheffieldSubstationisprotectedasmuchaspossibleandconsequencesofunplannedoutagesminimisedtopreventpossiblewidespreadsystemdisturbances.TogetherwithGeneralReliabilityfromSanDiego,California,TransendundertookthereliabilityevaluationoffourredevelopmentoptionsforSheffieldSubstationusingSUBREL,substationreliabilityandTRANSREL,transmissionsystemreliabilityprograms.1.INTRODUCTIONTransend,asaTransmissionServiceProviderandTransmissionNetworkOperatorinTasmaniaisresponsibleforprovidingreliableelectricitysupplyandprovidingcosteffectivedevelopmentsolutions外文翻译（译文）-2-ofthetransmissionnetwork.Transendhasidentifiedaneedforacomprehensiveandmoreobjectiveprocessinjustificationofdevelopmentprojectsfromitscapitalworksprogram.Theneedtocombinecustomerreliabilitytargetsandeconomicstoachievecosteffectivedevelopmentsolutionshasbeenlongrecognised.Ahierarchicalframeworkforoverallpowersystemreliabilityevaluationispresentedin[1].Differentdesign,planningandoperatingprinciplesandtechniqueshavebeendevelopedindifferentcountriesovermanydecadesinanattempttofindbalancebetweenreliabilitytargetsandeconomicconstraints[2].Followingthereliabilityconceptandprinciples,differentutilitiesapplieddifferentreliabilitycriteriatojustifyprojectsfromtheircapitalworksprogram.Reliabilitycriteriacanbeviewedasconditionsthatshouldbesatisfiedbyelectricitygeneration,transmissionanddistributionsystemsinordertoachieverequiredreliabilitytargets.Reliabilitycriteriausuallyfallintotwocategories:establishednumericaltargetlevelsofreliability(eglevelofexpectedenergynotsupplied)andperformancetestcriteria(egN-1,N-2incidentsthatthesystemhastowithstand).AnattempttocombinethesetwocategoriesintoonesetofreliabilitycriteriaiscurrentlyunderwayinTasmania[3].Theuseofreliabilitycriteriafromthefirstcategoryisthecoreofprobabilisticreliabilityevaluationapproach.Thesecondcategoryisadeterministicreliabilityevaluationapproach.Theusefulnessofdeterministiccriteriaandsecuritystandardsinjustificationofprojectsfromcapitalworksprogramischallengedin[4].Instead,anapproachinvolvingcustomersindecisionmakingandsimulatingarealisticsystemoperationandfailureiscommended.Thebasicstepssuggestedinproperreliabilityevaluationsarebasedoncompleteunderstandingoftheequipmentandsystembehaviourincluding:•Understandingthewaytheequipmentandsystemoperate;外文翻译（译文）-3-•Identifythesituationsinwhichequipmentcanfail;•Understandconsequencesofthefailures;•Incorporatetheseeventsintothereliabilitymodel;•Usetheavailableevaluationtechniquestocalculatereliabilityindicesandcosts.Withthisunderstandingofthesystembehaviourprobabilitytheoryisthenonlyseenasatooltotransformthisunderstandingintothelikelysystemfuturebehaviour.2.SELECTIONOFEVALUATIONTECHNIQUEANDSOFTWARETOOLSTherearetwomaincategoriesofevaluationtechniques[5]:analytical(stateenumeration)andMonteCarlosimulation.Theadvantagesanddisadvantagesofbothmethodsarediscussedin[1].AnalyticaltechniquewaschosenbyTransendbecauseofitsusefulnessincomparingdifferentdevelopmentoptionsfornetworkdevelopmentprojects.ThisapproachwaspresentedalsointheElectricitySupplyAssociationofAustraliaGuidelinesforReliabilityAssessmentPlanning[6].Consequently,decisionwasmadetoacquireSUBREL,andTRANSREL,substationreliabilityandtransmissionsystemreliabilityprogramsfromGeneralReliability,USA.2.1.SUBREL-SUBSTATIONRELIABILITYPROGRAMSUBRELisacomputerprogramwhichcalculatesreliabilityindicesforanelectricityutilitysubstationandgeneratingstationswitchyard[7].Themethodologyusedtoanalyseimpactofsubstationgeneratedoutagesonoverallsystemreliabilityperformanceshasbeendescribedin[8].Theprogrammodelsthefollowingoutageevents,includingallrequiredsubsequentautomaticandmanualswitchingoperations:1.Forcedoutageofanysubstationcomponent:外文翻译（译文）-4-•Breaker•Transformer•BusSection•Disconnector2.Forcedoutageofanincomingline.3.Forcedoutageoverlappingamaintenanceoutageforsubstationequipmentoranincomingline.4.Stuckbreaker(failuretoopenwhenneededtoclearthefault).SUBRELcalculatesthefollowingloadpointindices:•FrequencyofInterruption(peryear)•NumberofCircuitsInterruptions(peryear)•OutageDuration(minutesperoutage)•AnnualTotalOutageDuration(minutesperyear)•CustomerMinutesofInterruptionCMI(peryear)•ExpectedUnsuppliedEnergy(EUE)(kWhperyear)•ExpectedOutageCost($peryear)SUBRELalsocalculatesthefollowingsubstationortotalsystemindices:•SAIFI,SystemAverage