基于阀侧电流不对称性的LCC-HVDC系统换相失败检测

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中图分类号：TN911.23-34；TM721文章编号：1004-373X（2026）06-0152-08

Detection of commutation failure in LCC-HVDC system based on the currentasymmetryofvalve-side

LIUJietong¹，LIUDui1，2，3，LINBing1，CHENXi1，HE Zhijie¹，LUYu1 （1.CollgefisdjlUia;aioag; 3.CollgeofElectrical Engineeringand Automation，Fuzhou University，Fuzhou 3501o8，China）

Abstract：WiththewidespreadapplicationofHVDCtransmisiontechnologyinlong-distanceandlarge-capacitypower transmisio，line-commutatedconverterbasedhighvoltagedirectcuent（LCC-HVDC）atractsmuchattentioduetoitsunique advantages.However，thesemi-controlleddevicesusedinLCC-HVDCsystemlackself turningoffcapabilityandcommutation failureiseasytooccurincaseoffault，whichgreatlyafectsthestabilityandsafetyofthesystem.Therefore，thedynamic commutationprocessofLCC-HVDCsystemisresearched，thevariationcharacteristicsofthevalve-sidecurrentof theconverter transformerundernormaloperationandACsystemfaultsareanalyzedindetail，andthevariationfeaturesofthiscurrentare extracted.Onthisbasis，acommutationfailurecriterionofLCC-HVDCsystemisproposed basedonitsasymmetry characteristics，enablingrapidandaccurateidentificationofmultiplecommutationfailures．BasedonthePSCAD/EMTDC simulatinplatform，theefectivenessofthismethodundervariousoperatingconditionsisverifiedbymeansofsimulationmodels of CIGRELCC-HVDCsystemand practical double-circuit ransmissionlines modelsonthesametower.Theexperimentalresults indicate thattheproposedcriterionhasfastresponseandhighdetectionaccuracyinmulti-commutation failurescenarios， demonstratingstrongreliabilityandrobustnessandprovidingatheoreticalreferencefortheetectionofcommutationfailurein practical engineering applications.

Keywords：commutation failure detection；LCC-HVDC system；converter transformer;valve-sidecurrent；asymmetry： commutationfailurecriterion;CIGREstandard testmodel

0 引言

电网换相换流器的高压直流（Line-CommutatedConverter based High Voltage Direct Current，LCC -HVDC）系统因其在远距离、大容量输电中的显著优势，已成为跨区域电力传输的主流技术1-2]。（剩余9660字）