第47卷第2期电网技术Vol.47No.22023年2月PowerSystemTechnologyFeb.2023文章编号：1000-3673（2023）02-0784-09中图分类号：TM721文献标志码：A学科代码：470·40基于六次谐波分量的柔性直流电网后备保护贾科，刘鑫，钮厚敏，温志文，毕天姝（新能源电力系统国家重点实验室(华北电力大学)，北京市昌平区102206）BackupProtectionofFlexibleDCPowerGridBasedonSixthHarmonicComponentJIAKe,LIUXin,NIUHoumin,WENZhiwen,BITianshu(StateKeyLaboratoryofAlternateElectricalPowerSystemWithRenewableEnergySources(NorthChinaElectricPowerUniversity),ChangpingDistrict,Beijing102206,China)1ABSTRACT:Atpresent,inthedcpowerdistributionnetworkprojectsathomeandabroad,mostlythehalf-bridgesub-modulesareappliedandthelow-voltagecircuitbreakersareequippedwithtoremovefaults.However,themeasurementerrorscausedbythefaultwaveformdistortionmaydegradetheperformancesofthehigh-speedmainprotectionorrejecttheoperations.InordertoensurethesafeandreliableoperationoftheflexibleDCengineering,itisnecessarytostudytherelatedbackupprotectionmethods.Inviewofthisproblem,thetime-frequencyresponsecharacteristicsofdifferentdiodeconductioncombinationsaftertheswitchingdeviceislockedareanalyzed,andthefaultcharacteristicsoftheconstantsixthharmoniccomponentsaredetermined.Furthermore,abackupprotectionbasedonthesixthharmonicreactancemeasurementisproposed.Therelationshipbetweentheprotectionreactancemeasurementandtheactionreactanceisusedtomaketheprotectionoperatereliablyundervariousfaultconditions.Finally,adual-terminalflexibleDCdistributionnetworkmodelisbuiltonthePSCAD/EMTDCelectromagneticsimulationplatform.Thesimulationresultsshowthattheproposedprotectionschemeonlyusesthesingle-terminalinformationtoachievefaultremovalreliably,andhasastrongabilitytowithstandthetransitionresistanceandnoise.KEYWORDS:flexibleDCdistributionnetwork;converterlock;sixthharmoniccomponent;backupprotection摘要：目前，国内外直流配电网工程多采用半桥子模块，同时配备低压断路器切除故障。然而，故障波形畸变造成的测量误差，可能使高速主保护动作性能下降或拒动。为保证柔性直流工程的安全可靠...
