第51卷第2期电力系统保护与控制Vol.51No.22023年1月16日PowerSystemProtectionandControlJan.16,2023DOI:10.19783/j.cnki.pspc.220559HVDC/GIC型直流偏磁的差异性分析马书民1,夏少连2,熊玮2,林湘宁1,李正天1,郑宇超1,吴宇奇1,徐海波3(1.华中科技大学强电磁工程与新技术国家重点实验室,湖北武汉430074;2.国家电网公司华中分部,湖北武汉430074;3.易事特集团股份有限公司,广东东莞523808)摘要:考虑到地磁感应电流(geomagneticallyinducedcurrent,GIC)具有低频性,过去一直将其近似等效为高压直流输电(highvoltagedirectcurrent,HVDC)诱发的不平衡电流进行研究。然而,与HVDC型直流偏磁相比,GIC型直流偏磁具有显著的随机性与时变性,因此简单地将两者完全等效处理并不合理,在特定场景下应加以区分。为此,首先,从理论上分析了两种类型直流偏磁在诱发原因及特点上的差异。其次,通过研究直流偏磁对变压器本体以及电流互感器的不利影响,进一步探究两种类型直流偏磁对电网一/二次设备的影响差异,为后续的偏磁治理提供有效参考。最后,基于PSCAD/EMTDC仿真平台搭建了等效仿真模型,并通过仿真验证了理论分析的正确性。关键词:HVDC型直流偏磁;GIC型直流偏磁;变压器饱和;CT饱和;变压器差动保护DifferenceanalysisofHVDC/GICtypeDCbiasMAShumin1,XIAShaolian2,XIONGWei2,LINXiangning1,LIZhengtian1,ZHENGYuchao1,WUYuqi1,XUHaibo3(1.StateKeyLaboratoryofAdvancedElectromagneticEngineeringandTechnology,HuazhongUniversityofScienceandTechnology,Wuhan430074,China;2.CentralChinaBranch,StateGridCorporationofChina,Wuhan430074,China;3.EASTGROUPCO.,LTD.,Dongguan523808,China)Abstract:Consideringthatgeomagneticallyinducedcurrent(GIC)haslowfrequency,ithasbeenapproximatelyequivalenttotheimbalancecurrentinducedbyhighvoltagedirectcurrent(HVDC).However,comparedwiththeHVDC-typeDCbias,theGIC-typeDCbiashassignificantrandomnessandtime-varying,soitisnotreasonabletosimplytreatthetwoascompletelyequivalent,andtheyshouldbedistinguishedinspecificscenarios.Forthisreason,first,thedifferencesintheinducedcausesandcharacteristicsofthetwotypesofDCbiasesareanalyzedtheoretically.Second,bystudyingtheadverseeffectsofDCmagneticbiasontransformerbodyandcurrenttransformer,thedifferencesoftheinflu...