2023学年完整公开课版Stationcontrolofconverterstation

StationcontrolofconverterstationStationcontrolofconverterstationDCstationcontrolItmainlycompletesthefunctionsofbipolarDCfieldswitchcontrolandtotalstationreactivepowercontrol.ACstationcontrolRealizethecontrolandmonitoringofACfield.OverallFunctionalStructureofStationControlSystemofJiaoDongStation：StationcontrolofconverterstationACstationcontrolControlandMonitoringofACHighVoltageSwitchingFieldCommandInterlockingfromOperatorControlSystemLANNetworkCommunicationwithConverterUnitControlSystem,DCStationControlSystem,ServerandTelecontrolWorkstationFieldBusCommunicationwithLocalMeasurementandControlSystemSERfunctionRedundancyDesignofACStationControlSystemThedesignofACstationcontrolsystemisredundant,fromcentralcontrolunit,LANnetworkcommunicationtoPROFIBUScommunicationwithredundantlocalI/Ounits.Theredundantcontrolsystemcanbestartedbytheoperatorattheworkstation,orcanbemanuallyswitchedbytheswitchinglogiconthecubicle.ACstationcontrolMainfunctions:Open/closeoperationofallcircuitbreakers,disconnectorandgroundingswitchinACfield.TheACstationcontrolsystemreceivescontrolcommandsfromOWS(orTCWS)andmainlycompletestheopening/closingoperationofallcircuitbreakers,disconnectorsandgroundswitchintheACfield.Allthesecontroloperationsaredesignedwithsafeandreliableinterlockingfunctiontoensurethenormaloperationofthesystemandequipmentandthepersonalsafetyofoperators.Fromthelevelofcontrolposition,allcontrolfunctionsofACstationcontrolsystemcanbeaccomplishedatfourlevels:remotedispatchingcenter,maincontrolroomofconverterstation,localcontrolpositionandlocalequipment.Thepriorityofsystemcontrolfunctionshouldbedesignedasfollows:thelowerthehierarchicalstructure,thehigherthecontrolpriority.Theautomaticsequentialcontrolfunctioniscompletedatthelevelofglobalcontrolandinterlockingasshowninthefigure.ACstationcontrolInterlockingInterlockingincludeshardwareinterlockingandsoftwareinterlocking.Thetypesofhardwareinterlockingincludemechanicalinterlocking,electromagneticinterlockingandelectricalinterlocking.Interlockingshouldbeachievedatalllevelsofoperation,includingremotedispatchingcenter,operatorworkstation,thelocalprotectionroomandthelocalequipment.InterlockingRangeofConverterStationConverterstationinterlockingsystemmainlyincludes:DCswitchingfield;Convertertransformer,converterandvalvehall;ACswitchingfield(includingACfilterfield);Stationpowersystem(includinghighvoltage,lowvoltage,UPSandDCbatterysystem,etc.);InterlockingDesignPrinciples

Thedesignofinterlockingsystemshouldmeetthefollowingrequirements:Closeddisconnectorwithoutload;Opendisconnectorwithoutload;(exceptDCfilter)Whenthegroundswitchcloses,thedisconnectorisnotclosed.Whenthebusorequipmentislive,thegroundingswitchisnotoperated.Personneldonotmistakenlyentertheliveinterval;Thefunctionofinterlockingsystemshouldbecompletedatthelowestlevelofcontroltoensurethatinterlockingcanbeeffectivelyimplementedevenwhentheequipmentisintherelayroomorlocalcontroloftheequipment.GeneralPrinciplesofACFieldInterlockingACcircuitbreakerGenerally,theoperationofACcircuitbreakerisnotrestrictedbyinterlockingconditions.Aslongasthereisnolockingsignaloftheoperatingmechanismofthecircuitbreakeritself,thecircuitbreakercanbeoperated.（Note:Whenclosing,thedisconnectoronbothsidesofcircuitbreakershouldbeopenorclosedatthesametime.）ACdisconnectorAtthesametime,thefollowingconditionscanbemettooperatethedisconnector:Theadjacentcircuitbreakersareallopen.Theadjacentgroundingswitchareopen.Iftheothersideoftheadjacentcircuitbreakerisdirectlyconnectedwiththegroundingswitch,thegroundingswitchmustalsobeopened.ACgroundingswitchThefollowingconditionsmustbemetforACgroundingswitchclosing:Itisprohibittooperatethegroundingswitchelectrified.Inparticular,whentheadjacentintervalsarepoles,filtersortransformers,lines,thereareadditionalinterlockingconditionsbetweenthedisconnectorandthegroundingswitch.MiddleswitchinterlockWhen3/2connectionisusedintheACfieldconnectedwiththeconvertertransformer,the"middleswitch"logicshouldbedesignedaccordingtothefollowingrequirements:(1)WhenconvertertransformerandAClineareconnectedinseries,twosideswitchestriple-phasejump-offoccurs.Whenonlythemiddleswitchisinoperation,thecorrespondingDCvalvegroupshouldbeimmediatelyblocked.(2)WhentheconverterisinserieswithalargegroupofACfilters,twosideswitchestriple-phasejump-offoccurs.Whenthemiddleswitchisonlyrunning,thecorrespondingDCvalvegroupshouldbeimmediatelylocked.(3)WhenalargegroupofACfiltersareinserieswithAClines,twosideswitchestriple-phasejump-offoccurs.Whenonlythemiddleswitchisinoperation,themiddleswitchshouldbejumpedoffimmediatelysothatthelargegroupofACfilterswillbecutoff.(4)Three-phasetrippingoftwosideswitchesoccursbetweenlargeACfiltersandmaintransformerorfactorytransformer.Onlywhenthemiddleswitchisinoperation,themiddleswitchshouldbeimmediatelytrippedtoshutdownthelargeACfilters.(5)Converterandmaintransformermatchingseries,therearetwosideswitchesthree-phasejump,onlywhenthemiddleswitchisrunning,thecorrespondingDCvalvegroupshouldbeimmediatelyblocked;(6)WhentheconvertertransformerandtheAClineareinseries,whenthesideswitchbetweentheconvertertransformerandthebusisrepairedorshutdown,iftheAClineintheserieshasasingle-phasefault,ifthelineisputintosingle-phasereclosure,inordertoavoidnon-full-phaseoperation,thesingle-phasefaultofthelineshouldbejumpedoutwhilethesingle-phasefaultisjumpedout,thethree-phasemiddleswitchshouldbeconnectedtothesideoftheline.Switchesshouldbeoperatedaccordingtothesetlogicoftripping,nottrippinginthreephases.(7)Whenasingle-phasefaultoccursintheAClineofalargegroupofACfiltersandbuseswhenthesideswitchbetweenthelargegroupofACfiltersandbusesisrepairedorshutdown,ifthelineisputintosingle-phasereclosure,thesingle-phasefaultofthelineshouldbetrippedwhiletrippingthesingle-phasefaultoftheline,andthesideswitchconnectedwiththelineshouldbetrippedatthesametime.Theswitchshouldbeoperatedaccordingtothesetlogicoftripping,nottrippinginthreephases.MiddleswitchinterlockDCstationcontrolDCfieldcontrol:HVDCswitchcontrolandmonitoring,automaticDCfieldconfigurationsequence(including:polegrounding,poleisolation,poleconnection,metalgroundconversion,polelinegrounding,polelineisolation,polelineconnection)Reactivepowercontrol:ACbusvoltageandreactivepowermeasurement,ACfilterswitchcontrolandmonitoring,groupswitchingbasedonreactivepowerstatus,groupswitchingbasedonbusvoltage,groupswitchingbasedonACovervoltage,coordinationandswitchingofcontrollevel(systemlevel,stationcontrollevel),controlLocationcoordinationandswitching(localcontrol,operatorcontrolandremotedispatchcontrol)Conventionalfunctions:communicationwithotherstations,LANnetworkcommunicationwithlocalstationcontrolandprotectionsystem,fieldbuscommunicationwithmeasurementandcontrolunitRedundancyfunction:hardwaremonitoringfunction,softwaremonitoringfunction,systemswitchinglogicSequentialEventRecordingFunction:EventProcessinginmeasuring

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controlUnit,SoftwareEventProcessing,EventProcessingandSendingtoOperatorWorkstationandTelecontrolWorkstation.DCoperationmodeconfigurationDCoperationmodeconfigurationisabipolarstation-levelfunction.ThereareninebasicoperationandtestmodesfortheconventionaldefinitionofHVDCtransmission:Bipolarmodepole1groundCircuit(GNDRET)pole2groundCircuitPole1MetalLoop(METRET)Pole2MetalLooppole1OLT,pole2groundcircuitPole1OLT,Pole2Isolationpole2OLT,pole1groundcircuitPole2OLT,Pole1IsolationTheaboveconfigurationofoperationmodeiscompletedinthefollowingorder:Pole1/2connection,isolationGroundlineconnection,isolationPole1/2MetalCircuitConfigurationDCoperationmodeconfigurationcontrolmodeTherearetwocontrolmodesinDCmodeconfigurationdesign:AutomaticcontrolmodeManualcontrolmodeIntheautomaticcontrolmode,thesystemautomaticallyexecutesacertainsequenceofstepsuntilthenewtargetisselected.Manualoperationofasingleswitchisnotallowedinautomaticmode.Inthemanualcontrolmode,theswitchcanbeoperatedinremotedispatchcontrolposition,operatorcontrolpositionandlocalinterface.Inordertoensurethesafetyofswitchoperation,therearestrictinterlockingconditionsassociatedwithswitchoperationorders.AllowableconversionprocessbetweenDCconfigurationsPoleConnectionandPoleIsolationpoleconnectionThepoleconnectionconnectsthepoleDCbustotheDCline,andthepoleneutralbustothegroundelectrodeorthemetalloop.poleisolationPoleisolationdisconnectsthepolefromtheDClineandthegroundpole.Thepoleisolationsequencewilldisconnecttheconverterfromtheneutralbusandthepoleline.Itshouldbenotedthatthepolelineisolationswitchdoesnothavetheabilitytocutoffcurrent.IfthereisDCcurrentflowingthroughtheconverter,theneutralbusswitchmustbeturnedonfirstwhenpoleisolationoccurs,whichwillbecontrolledbydifferentisolationsequence.DCSwitchFieldInterlockingDCSwitchFieldInterlocking:InterlockingControlinPoleControlSoftware:InterlockingofValveHallGroundswitch,DCFilterdisconnectorandGroundswtichInterlockingcontrolinDCstationcontrolsoftware:interlockingofotherbipolarDCfieldswitchTheseinterlockingconditionsplaythesameroleinmanualcontrolandautomaticsequentialcontrol.TakeJiaoDongstation(inverterstation)06105isolationswitchasanexampleOpeningpermit:pole1locking,P1_IDL<2%;Closingpermit:0010switchclosingposition,061057,0610517groundingswitchopeningposition,06121isolationswitchopeningposition,s1-p1-wp-q22openingposition,stationgroundorgroundcircuitormetalcircuitinpole1station.DCSwitchFieldInterlockingConfigurationsequenceofDCoperationmodeTheconversionofDCoperationmodeisinitiatedbyoperators,andthesystemwillautomaticallycompleteallstepsandsequencetoreachthetargetstate.Thisprocessincludesthejudgementofinter-stationcoordinationandinterlockingconditions.Inthecaseofinter-stationcommunicationfailure,thecoordinationandinterlockingconditionsshouldbeshielded,recoveringtooperatebeforethecommunicationconfirmedcorrectlybyoperators.ThetransformationbetweenDCoperationmodesismainlycomposedofthefollowingbasicconversionsequence:Pole1/2ConnectionPole1/2GroundingGroundingPoleLineConnectionGroundingPoleLineGroundingUnipoleGroundCircuitUnipolarMetalCircuit

Reactivepowercontrolisanindispensableandimportantfunctioninthewholecontrolsystem.ItspurposeistocontroltheperformanceofACsystem(reactivepowerandharmonics)connectedwiththeconverterstation.Itincludesthefollowingfunctions:Decisionofinput/cutofffilterbanks,basedonreactivepowerexchangebetweenconverterstationandACsystemAccordingtothestateofthefilterbanks,thepriorityofthefilterbanksthatcanbeinput/cutoffisrankedtodecidewhichtypeoffilterbankstoinput/cutoffandwhichgroupoffiltersinthattype.ReactivePowerControlFunctionThereactivepowerofthegroupisinputdirectlyfromCT/PTtothemeasurementandcontroldevice.ThegroupcurrentiscomputedbyCT-T3.LargegroupvoltagefromPT-PT12Three-phasecurrent,groupvoltageandgroupreactivepoweraremeasuredandcalculatedbyDFU410measurementandcontroldevice.LargegroupsofACbusvoltagearedirectlyconnectedtoDCstationcontrolthroughhardconnection.Thesystemchoosesthelargestbusvoltageofeachgroupascontrol.ReactivePowerControlFunctionAbsMinFiler:Absoluteminimumfiltercapacitylimit,absoluteminimumfilterbanksrequiredtopreventoverloadoffilterequipment.Inanycase,theconditionmustbemet.Umax:Maximum/MinimumVoltageLimit.Monitorthesteady-statevoltageofACbustoavoidtheprotectionactioncausedbysteady-stateovervoltage.Qmax:Maximumreactivepowerswitchinglimit,accordingtothecurrentoperatingconditions,limitthenumberofinputfilterbanks,limitthesteady-stateovervoltage.MinFilter:Minimumfiltercapacityrequirement,minimumfilterbanksrequiredtomeettherequirementsofharmonicfiltering.Qcontrol/Ucontrol:Reactivepowerswitchingcontrol/voltagecontrol(switchable),controlthereactivepowerswitchingofconverterstationandACsystemasthesetreferencevalue/controltheACbusvoltageofconverterstationasthesetreferencevalue.ReactivePowerControlFunction-PriorityReactivePowerControlFunction-PriorityTheDCpolecontrolsystemobtainsthestatesignalsofthefilterbanksfromtheACstationcontrolsystem,whichenablesthereactivepowercontroltodeterminewhichtypeoffilterandwhichgroupoffiltersofthistypewillbeputin/cutoffaccordingtothecurrentoperatingconditionsandthestateofthefilterbanks.Thesametypeoffilterbanksareinputinacyclicmannerandfollowtheprincipleof"firstin,firstout",sothattheputin/cutofftasksofallavailablereactivepowerdevicesareasequalaspossible,soastoprolongthelifeofACfilters.IntheprocessofDCpowerrisingandfalling,theinputandcutofACfilterbankswillfollowacertainorder.Thecontrolsystemautomaticallychooseswhichtypeoffiltertoputin/cutoffaccordingtothecurrentworkingcondition.ReactivePowerControlFunction-Selectionofinput/cutoffFilterPrinciple:Whenonegroupoffiltersistrippedbyprotection,reactivepowercontrolautomaticallyputsanothergroupoffilterstoreplacethetrippedfilterbanksaccordingtotherequirementsofabsoluteminimumfilterorminimumfiltercontrol.Ifthetrippingfilterbelongstotheabsoluteminimumfilterrequirement,thenewfilterwillbeputin1S.Ifthetrippingfilterbelongstotheminimumfilterrequirement,thenewfilterwillbeputin5Sintheautomaticmode.ReactivePowerControlFunction-ReplacementofFilterBanksInordertoaccomplishtherelatedcontroltasks,reactivepowercontrolobtainsthefollowinginformationfromthestationcontrolsystem: