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基于PSCADEMTDC的HVDC换流器触发控制建模仿真.docx

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基于PSCADEMTDC的HVDC换流器触发控制建模仿真 1.Introduction HVDC(high-voltagedirect-current)transmissiontechnologyhasbeenwidelyusedforlong-distancepowertransmissionduetoitsadvantagesoflowloss,strongcontrollability,andhighstability.TheHVDCconverterstationisthekeyequipmentintheHVDCtransmissionsystem,whichisresponsibleforconvertingtheACpowerintoDCpowerandviceversa.ThecontrolstrategyoftheHVDCconverterstationiscrucialforensuringthestableandreliableoperationoftheentiresystem.Inthispaper,wewillfocusonthemodelingandsimulationofthetriggercontroloftheHVDCconverterstationbasedonthePSCADEMTDCsoftware. 2.HVDCConverterStationandTriggerControl TheHVDCconverterstationconsistsoftwoconvertervalves,whichcanbeeitherthyristor-basedorIGBT-based.ThetriggercontrolisusedtocontroltheconductionangleofthethyristorsortheswitchingfrequencyoftheIGBTs,whichdirectlyaffectstheDCvoltageandcurrentinthesystem.Themainfunctionofthetriggercontrolistoensurethatthecommutationprocessiscompletedsmoothlyandreliably,whichcanavoidtheoccurrenceofovervoltageandovercurrentinthesystem.Therefore,thetriggercontrolisoneofthemostimportantaspectsoftheHVDCconverterstationcontrolsystem. 3.ModelingofHVDCConverterStationinPSCADEMTDC PSCADEMTDCisapowerfulsimulationsoftwareforpowersystemanalysis,whichprovidesacomprehensivemodelingtoolforHVDCtransmissionsystem.InPSCADEMTDC,theHVDCconverterstationcanbemodeledbyusingthebuilt-incomponents,suchasthetransformer,ACfilter,DCfilter,thyristor/IGBT,triggercontrol,andsoon.Themodelingprocessinvolvestheselectionofappropriatecomponents,theconfigurationofparameters,theconnectionofcomponents,andthedefinitionofcontrollogic. 4.TriggerControlStrategyforHVDCConverterStation ThetriggercontrolstrategyfortheHVDCconverterstationdependsonthetypeofconvertervalvesandthespecificrequirementsofthesystem.Generallyspeaking,therearetwotypesoftriggercontrolstrategies:fixed-anglefiring(FAF)andvariable-anglefiring(VAF).FAFissuitableforthyristor-basedconvertervalves,whichcanensurethecommutationprocessiscompletedsmoothlyandreliabl