柔性直流输电系统的功率模块涡流损耗及其温升分析张艳梅,娄彦涛,孙小平,马志荣,雒雯霞,郑全旭(西安西电电力系统有限公司,西安710065)摘要:基于模块化多电平换流器的柔性直流输电在电力传输领域有着广阔的应用前景,而主回路母线的大电流会在功率模块的铁磁框架中产生涡流损耗,导致不必要的温升。因此文中针对柔性直流输电换流阀的功率模块建立电磁模型,对其进行电磁—热耦合仿真分析,得出了涡流损耗和温度的分布特征。根据仿真结果及相关分析,提出了3种改进温升问题的方法,对功率模块设计具有一定的指导意义。最后通过实验验证了仿真结果的真实性和改进方案的有效性,为今后功率模块的设计制造和模块化多电平换流器(modularmultilevelconverter,MMC)的运行管理提供参考依据。关键词:涡流损耗;温升;功率模块;模块化多电平;柔性直流输电系统AnalysisofEddyCurrentLossandTemperatureRiseinPowerModuleofVSC⁃HVDCZHANGYanmei,LOUYantao,SUNXiaoping,MAZhirong,LUOWenxia,ZHENGQuanxu(Xi’anXDPowerSystemCo.,Ltd.,Xi’an710065,China)Abstract:VSC⁃HVDCbasedonmodularmultilevelconvertershasabroadapplicationprospectinpowertransmis⁃sion.However,thelargecurrentofthebusbarwillinducetheeddycurrentlossintheferromagneticframeofpowermodules,resultinginundesiredtemperaturerise.Therefore,theelectromagneticmodelofthepowermoduleforHVDCconvertervalveissetupinthispaper,ofwhichtheelectromagnetic⁃thermalcouplingsimulationanalysisisperformedandthedistributioncharacteristicsoftheeddycurrentlossandtemperatureisobtained.Accordingtothesimulationresultsandrelatedanalysis,threekindsofmethodsforimprovingthetemperatureriseproblemarepro⁃posed,whichhaveadefiniteguidancesignificancetothedesignofthepowermodule.Finally,theauthenticityofsim⁃ulationresultsandeffectivenessoftheimprovedschemeareverifiedbyexperiments,whichcanprovidereferenceformanufactureofpowermodulesdesignandoperationmanagementofMMCinthefuture.Keywords:Eddycurrentloss;temperaturerise;powermodule;modularmultilevelconverter;VSC⁃HVDC0引言近年来,随着工业规模和城市规模的不断发展,电力用户对于各种形式的电力需求与日俱增,需要不断增加电网的容量。在这样的背景下,高压、大...