文档摘要：随着特高压直流输电系统的发展,电网送、受端安装了大容量调相机用于提供动态无功支持,以防止换相失败.某换流站调相机启动调试期间,励端X向瓦振超标跳机.结合振动伯德图和瀑布图发现,原因为调相机升速阶段穿越转子三阶副临界转速时,产生2倍频共振,共振频率与轴承系统某固有频率接近,导致轴承系统发生共振.现场通过分步试验的方式,逐步调整轴承系统刚度、更换轴承座等,以避开转子2倍频共振频率,并增强阻尼.试验后发现瓦振问题有一定改善,但仍超过正常运行要求.随后现场调整了励端轴承座顶部应急油箱的固定方式,并对应急油箱结构进行优化,发现励端瓦振明显降低,机组启停机阶段瓦振达到安全运行要求.
Abstract：WiththedevelopmentofUHVDCtransmissionsystem,largecapacitysynchronouscondensersareinstalledinpowergridtosupplydynamicreactivepowercompensationandpreventcommutationfailure.Duringthestart-upandcommissioningofthesynchronouscondenserinaconverterstation,thebearingvibrationofthesynchronouscondenseronexcitationendatX-directionexceededthestandardlevel,whichledtoatripaccident.CombinedwiththeBodediagramandthewaterfalldiagramofthevibration,itwasfoundthatthereasonwasthatthedouble-frequencyresonanceoccurredwhenthesynchronouscondenserpassedthroughthethird-ordersub-criticalrotatingspeedoftherotorduringtheaccelerationprocess,andtheresonantfrequencywasclosetoacertainnaturalfrequencyofthebearingsystem,resultinginmechanicalresonance.Thenthestiffnessofthebearingsystemwasadjustedstepbystepandthebearingseatwasreplacedtoavoidthedouble-frequencyresonancefrequencyoftherotorandtoenhancethedampingonsite.Itwasfoundthattheproblemofbearingvibrationhasbeenimprovedtosomeextent,butitstillexceededthenormaloperationrequirementsafterthetest.Subsequently,thefixingmethodoftheemergencyoiltankatthetopofthebearingseatonexcitationendwasadjusted,andthestructureoftheemergencyoiltankwasoptimized.Itwasfoundthatthebearingvibrationonexcitationendwassignificantlyreduced,andthebearingvibrationduringstart-upandshut-downprocessofthesynchronouscondensersreachedtherequirementsofsafeoperation.
作者：马天逵 张芬芬Author：MATiankui ZHANGFenfen
作者单位：国网江苏省电力有限公司超高压分公司,南京211102
刊名：大电机技术 ISTIC
Journal：LargeElectricMachineandHydraulicTurbine
年，卷(期)：2024, (3)
分类号：TM342
关键词：特高压直流输电系统 调相机 轴承系统 转子 振动
Keywords：UHVDCtransmissionsystem synchronouscompensator bearingsystem rotor vibration
机标分类号：TK73TM721.1TG406
在线出版日期：2024年7月1日
基金项目：300Mvar调相机瓦振跳机问题分析及处理[
期刊论文] 大电机技术--2024, (3)马天逵 张芬芬随着特高压直流输电系统的发展,电网送、受端安装了大容量调相机用于提供动态无功支持,以防止换相失败.某换流站调相机启动调试期间,励端X向瓦振超标跳机.结合振动伯德图和瀑布图发现,原因为调相机升速阶段穿越转子三阶副...参考文献和引证文献
参考文献
引证文献
本文读者也读过
相似文献
相关博文
关键词：特高压直流输电系统,调相机,轴承系统,转子,振动,
|
|
1
