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1,2,2(1.,211100;2.,100031):,2:2,,;2,,,2,2,,,:;;;;:TM721:2008211227;:2009201213(SGKJ[2007]87)0,,,[123],[4]3,3800kV,[526],5GW7.2GW,[728];,,,,[9],[10],,[11],2:,,,,;,,1412,2,2,11Fig.1MainconnectionatonesideofDCconverterstationforUHVDC833372009410Vol.33No.7Apr.10,2009,2,+800kV,-800kV2,1()2()22.1,,4kA,,10%,4.4kA,,2,[12],,,,,2.2,,,4kA,,,2:1);2),2,,,2,,;2,2,,0,,,,22Fig.2Preventivede2icingschemeforUHVDC:1),;2),:1)2,,,22),2,,()2,,3),,,;,,,,,,:,,93,:1)Deice_Mode,1;2),;3),2,,Deice_Status1;4)OPNOPN_FOP,:OPN_FOP0OPN121.1,Deice_Stop_OP1;5)Deice_Mode,Deice_Status,Deice_Stop_OP1,,Deice_Trip1,500kV,,2.3,2,,2,,33Fig.3Preventivede2icingschemeofsingleconverterstationforUHVDC,,,,,,3,,,,,6720mm2,8kA9kA[13],,2,,,2,8kA,,9kA[14]244Fig.4Mainconnectionforde2icingunderparalleloperationofdualconvertersinUHVDC4C1C4,,C1,C4,C4,2042009,33(7)4,:4800kVQ1Q4;2400kVQ5Q6;1400kVQ7;1400kVA1;2A2A3;1A4;,,,,,,2,:1)22)2,1/2,4kA,400kV,8kA,,9kA3)2,,2;,,,,,,,324,,2,:,,,,;,500kV,,3kA,10,,203090,,,,8kA,,,4,,,;,,;,[15],,,:1);2);3),;4),,,,,[1],..:,2002.[2],,,.2008.,2008,32(11):16219.LUJiazheng,JIANGZhenglong,LEIHongcai,etal.AnalysisofHunanpowergridicedisasteraccidentin2008.AutomationofElectricPowerSystems,2008,32(11):16219.[3],,,..,2004,30(1):6210.YUANJihe,JIANGXingliang,YIHui,etal.Thepresent14,studyonconductoricingoftransmissionlines.HighVoltageEngineering,2004,30(1):6210.[4],,,..,2008,32(4):23228.HUANGXinbo,LIUJiabing,CAIWei,etal.PresentresearchsituationoficingandsnowingofoverheadtransmissionlinesinChinaandforeigncountries.PowerSystemTechnology,2008,32(4):23228.[5],,,.800kV6400MW.,2006,30(1):128.SHUYinbiao,LIUZehong,GAOLiying,etal.Apreliminaryexplorationfordesignof800kVUHVDCprojectwithtransmissioncapacityof6400MW.PowerSystemTechnology,2006,30(1):128.[6]..,2006,32(1):35237.SHANGChun.Developmentofultra2highvoltagetransmissiontechnologyinChinasouthernpowergrid.HighVoltageEngineering,2006,32(1):35237.[7],,,..,2007,27(21):12216.TIANJie,CAODongming,LIHaiying,etal.TheresearchofimprovingthereliabilityofultraHVDCtransmission.ProceedingsoftheCSEE,2007,27(21):12216.[8],,,..,2007,31(19):95299.ZHANGLuqi,ZHOUJiaqi,LIUYang,etal.StatisticalanalysisonreliabilityindicesforHVDCtransmissionproject.AutomationofElectricPowerSystems,2007,31(19):95299.[9],,,..,2008,32(4):7213LIZaihua,BAIXiaomin,ZHOUZiguan,etal.Preventionandtreatmentmethodsoficecoatinginpowernetworksanditsrecentstudy.PowerSystemTechnology,2008,32(4):7213.[10],,,..,2008,32(5):126.CHANGHao,SHIYan,YINWeiyang,etal.Ice2meltingtechnologiesforHVACandHVDCtransmissionline.PowerSystemTechnology,2008,32(5):126.[11]..,2006,7(3):124.LILicheng.TechnicalcharacteristicsandengineeringapplicationofUHVDCpowertransmission.ElectricEquipment,2006,7(3):124.[12],,,..,2008,32(24):88292.HUMing,TIANJie,CAODongming,etal.AnalysisofstructureandconfigurationforUHVDCtransmissioncontrolsystem.AutomationofElectricPowerSystems,2008,32(24):88292.[13].:,1848575A[P].2006210218.[14],,,..,2008,34(11):227622282.ZHANGQingwu,TIANJie,FUChuang,etal.Researchonde2icingoperationmodeofthecontrolandprotectionsystemforUHVDC.HighVoltageEngineering,2008,34(11):227622282.[15],,,..,2007,31(14):982102.HUANGXinbo,SUNQindong,CHENGRonggui,etal.Mechanicalanalysisontransmissionlineconductoricingandapplicationofonlinemonitoringsystem.AutomationofElectricPowerSystems,2007,31(14):982102.(1982),,,,,:E2mail:zhangqw@nari2relays.com(1979),,,:(1972),,,,:De2icingSchemeforUHVDCTransmissionLineZHANGQingwu1,LBPengfei2,WANGDelin2(1.NanjingNARI2RelaysElectricCo.Ltd.,Nanjing211100,China;2.NationalElectricPowerDispatchingandCommunicationCentre,Beijing100031,China)Abstract:Ice2coatingofoverheadtransmissionlinesisharmfultothereliabilityofultrahighvoltagedirectcurrent(UHVDC).Thispaperdiscussestwokindsofde2icingschemesforUHVDC.Oneispreventiveandtheotherisofemergency.Inthepreventivescheme,thepowerflowsinoppositedirectionsinthetwopoles,whichformshighcurrentandlownetpowertopreventtheformationofice.Intheemergencyscheme,dualconvertersareconnectedinparallelinsteadofseries2connectionmodeateachstation;highdirectcurrentsareformedtomelttheicequickly.Thecontrolstrategyofemergencyde2icingschemeforUHVDCsystemispresented,theparallelconvertersattherectifiersidearebothincurrentcontrol,andattheinverterside,oneisincurrentcontrolandtheotherisinvoltagecontrol.ThereferencevalueforthecurrentcontrolledinverterishalfofthemeasuredDClinecurrenttobalancetheparalleledconverters,thevoltagecontrolledinvertercontrolsthevoltageofwholepole.Theproposedde2icingschemecangreatlyimprovethereliabilityofUHVDCbymitigatingtheinfluenceofice2coating.ThisworkissupportedbyStateGridCorporationofChina(No.SGKJ[2007]87).Keywords:de2icing;ultrahighvoltagedirectcurrent(UHVDC);controlstrategy;controlandprotectionsystem;converter242009,33(7)