柔性直流输电在交直流混联电网中的应用与展望

APPLICATIONANDPROSPECTOFVSC-HVDCINAC/DCHYBRIDPOWERGRID 黄伟煌南方电网科学研究院Weihuang HUANGSEPRI-CSG 2023年9月22日，济南22ndSept.,2023，JINAN 柔性直流的技术特点TechnicalcharacteristicsofVSC-HVDC 柔性直流的发展现状DevelopmentofVSC-HVDC 川.柔性直流在大电网中发挥的作用RoleofVSC-HVDCinLargePowerGrids IV.柔性直流在新型电力系统的应用与展望ApplicationandProspectofVSC-HVDCinNewPowerSystems 柔性直流技术特点VsC-HVDCtechnicalcharacteristics 柔性直流是采用全控型功率器件和模块化拓扑结构的新一代直流输电技术，可控性高、适应性好，可实现有功和无功独立解耦的全域运行。 VSC-HVDC is a newgenerationofDc transmissiontechnologythatadopts fully-controlledpowerdevices and modularized topology,withhighcontrollability,andcanrealizefourquadrantsoperationwithdecouplingcontrolofactiveandreactivepower. 除了输电外，柔性直流能否部分取代交流系统元件的功能，例如“交流联络线模拟”“虚拟电磁环网”？“直流电厂”？这是本报告主要讨论的问题之 Inadditiontotransmission,canVSC-HVDCpartiallyreplacethefunctionsofACsystemcomponents,suchas"Aclineemulation","Virtualelectromagneticloop","Dcpowerstation"?Thesearethemainquestionsthatwillbediscussedinthisreport. 柔性直流的技术特点TechnicalcharacteristicsofVSC-HVDo 柔性直流的发展现状DevelopmentofVSC-HVDC 川I.柔性直流在大电网中发挥的作用RoleofVSC-HVDCinLargePowerGrids IV.柔性直流在新型电力系统的应用与展望ApplicationandProspectofVSC-HVDCinNewPowerSystems 柔性直流技术发展现状DevelopmentofVSC-HVDC 柔性直流技术已成为全球关注热点和发展趋势VSC-HVDCtechnologyhasbecomeaglobalconcernanddevelopmenttrend 已运行的直流工程，传统直流占大多数、达到70%，柔性直流占21%LCCaccountsforthemajority(70%)oftheHVDCprojectsinoperation,andVSC-HVDCaccountsfor21% 规划中的直流工程，柔性直流成为主流方案，规划数量是传统直流的2倍AmongplannedHVDCprojects,VSC-HVDChasbecomethemainstream,twiceofconventionalLCC HVDCprojectsunderplanningandconstruction 柔性直流工程的电压和容量不断提高ThevoltageandcapacityofVSC-HVDCcontinuetoincrease. ·中国虽然起步晚，但无论是从发展速度还是工程容量上，都呈赶超趋势Although China started late, it is catching up both in terms of development speed and engineering capacity 目前柔性直流在电网互联、远距离输电、新能源送出、中低压配电等四类主要场景得到了广泛应用 Currently,VsC-HVDCiswidelyused infourmajor scenarios,includinggridinterconnection,long-distancepowertransmission,renewableenergytransmission,andpowerdistribution. 柔性直流技术应用于电网互联VSC-HVDCTechnologyAppliedtoGridlnterconnection 柔直应用于电网互联，实现两个电网电力交换，并提高已有交流电网安全稳定水平Vsc-HVDC for grid interconnection is applied to exchange power between two grids and improve thesecurityandstabilityofexistingACgrids ，电网互联可实现互供电力、互通有无、互为备用，可减少事故备用容量，增强抵御事故能力 柔直不增加交流短路电流，不受交流系统短路容量限制，可快速灵活调节潮流，是电网互联的重要技术手段VSC-HVDCdoesnotincreasetheshort-circuitcurrentoftheACpowergrid,notlimitedbySCRoftheACsystem,canquicklyandflexiblyregulatethepowerflow,andisanimportanttechnicalsolutionforgridinterconnection 柔性直流技术应用于电网互联VSC-HVDCTechnologyAppliedtoGridlnterconnection 电网互联典型应用Typicalapplicationsforgridinterconnection 鲁西背靠背柔直工程：首次将柔性直流用于西电东送主通道，实现电网分区柔性互联Luxiback-to-backvSC-HvDCproject:thefirsttimetouseVSC-HVDCforthemainchannelofwest-eastpowertransmission,realizingflexibleinterconnectionofasynchronouspowergrids. 厂东电网背靠背直工程：应用于广东电网负荷中心，实现不同交流电网区域交流系统敌障的隔离，提供快速功率控制与紧急功率支撑，增加电网稳定性 GuangdongBack-to-BackvsC-HvDCProject:AppliedintheloadcenterofGuangdong,itrealizestheisolationofACsystemfaultsindifferentACpowergridareas,providesfastpowercontrolandemergencypowersupport,andincreasesthestabilityofthepowergrid 柔性直流技术应用于远距离输电VSC-HVDCTechnologyAppliedtoLongDistancePowerTransmission 柔直运行控制，拓扑结构和核心器件的发展，促进了电压等级及输电距离的提升Development of control strategy,circuit topology and power electronic devices have facilitated the increase ofvoltagelevelsandtransmissiondistances -双阀组串联拓扑与3000A等级器件研制，将柔直电压提升至±800kV，容量提升至5000MW-Dual-valve serial topology and 3000A-rated device development to increase voltage to ±800kV and capacity to 5000Mw -ByinstallingDCcircuitbreakersoradopting"fullbridge+halfbridge"hybridtopology,DCfaultcurrentcanbeblocked,realizingfaultclearingandfastrestartunderlong-distanceoverheadlinefaults. 柔性直流技术应用于远距离输电VSC-HVDCTechnologyAppliedtoLongDistancePowerTransmission 远距离输电典型应用Typicalapplicationsforlongdistancepowertransmission 昆柳龙直流工程：落点广东的第10回直流输电工程，将乌东德电站（世界第7大水电）的电力输送至两广负荷中心，受端采取特高压柔性直流技术 KunliulongProject:the1OthDCtransmissionproject inGuangdong,transmittingpowerfromWDDStation (theworld's7thlargesthydropowerstation)totheloadcentersofGD&GXprovinces,withUHVVSC-HVDCtechnologyatthereceivingend 世界上首次将柔性直流用于远距离、大容量、架空线输电 -Theworld's firstapplicationofvsc-HvDcfor long-distance,high-capacity,overhead linepowertransmission. SchematicdiagramofKunliulongDCproject Udundehydroelectricpowerstation 柔性直流技术应用于新能源送出VSC-HVDCTechnologyAppliedtoRenewableEnergyTransmission 海风大容量集中送出能有效降低单位开发成本，柔直是深远海风电送出的主流方案Large-capacitycentralizedtransmissionofoffshorewindcanreducetheunitdevelopmentcost,VsC-HVDCisthemainstreamsolutionofthedistantoffshorewindpowertransmission 深远海风柔直送出，直流海缆无充电无功问题，输电距离远DistantoffshorewindVSC-HVDCtransmission;NoreactivepowerissuesforDCcables;Longdistancetransmission 国外已建成的海上风电柔直工程主要集中在德国，直流电压等级以土320kV为主CompletedoverseaoffshorewindpowerVSC-HVDCprojectsaremainlylocatedinGermany,DCvoltagearemainly±32OkV. 海风直流送出工程造价对比（国内）CostcomparisonofVSC-HVDCtransmissionprojectsforoffshorewindpowerplant(China) 柔性直流技术应用于新能源送出VSC-HVDC Technology Applied to Renewable Energy Transmission 新能源送出典型应用Typical applications of ren