文档名：变速抽蓄机组失磁故障分析及保护研究
摘要：变速抽蓄机组(VSPSU)的励磁及控制方式复杂且易发生失磁故障,配置针对性的失磁保护对保障其安全运行至关重要.该文基于直流励磁系统和交流励磁系统的差异分析,将VSPSU的失磁故障划分为对称失磁和不对称失磁两种故障形式,并主要针对对称失磁故障开展研究.首先,分别从故障位于机侧和网侧角度出发分析VSPSU发生对称失磁故障后的电气量变化特性及其故障危害;然后,推导证明了传统失磁阻抗圆保护判据在VSPSU中应用时不具有可靠性,VSPSU缺乏具有针对性的保护方案;最后,基于VSPSU的失磁故障特性,提出了针对机侧对称失磁故障的下抛阻抗圆判据和针对网侧对称失磁故障的直流电压判据,两者结合形成了对VSPSU对称失磁故障的保护方案.仿真结果表明,该文所提方案可有效地检测VSPSU在各种运行工况下的对称失磁故障,以满足VSPSU对失磁保护可靠性的要求.
Abstract：Theexcitationandcontrolmethodsofvariablespeedpumpedstorageunits(VSPSU)arecomplexandpronetothelossofexcitation(LOE)fault.Therefore,itisveryimportanttoconfiguretargetedprotectiontoensureitssafeoperation.Duetothespecialthree-phaseACexcitationmethodusedinVSPSU,itsLOEfaultisquitedifferentfromthatofconventionalunits.Atpresent,theLOEprotectionschemeofthetraditionalDCexcitationsynchronousmachineisrelativelymature,buttherearefewstudiesontheLOEfaultcharacteristicsandLOEprotectionoftheACexcitationdoubly-fedmachine,andareliableprotectionschemehasnotyetbeenformed.ToensurethesafeoperationofVSPSU,thispaperanalyzesthecharacteristicsoftheLOEfaultoftheVSPSUindetailandputsforwardthecorrespondingLOEfaultprotectionschemeonthisbasis.Firstly,basedonthedifferenceanalysisbetweentheDCexcitationsystemandtheACexcitationsystem,theLOEfaultofVSPSUisdividedintotwotypes:symmetricalLOEandasymmetricalLOE,andtheresearchismainlycarriedoutonthesymmetricalLOE.Secondly,thefaultcharacteristicsandfaulthazardsofVSPSUsymmetricalLOEareanalyzedfromthepointofviewofthefaultlocatedonthemachinesideandthegridside,respectively,andtheimportanceofconfiguringLOEprotectionforVSPSUisclarified.Then,theadaptabilityofthetraditionalLOEprotectioncriterionbasedonimpedancecirclewhenappliedinVSPSUisdeducedandanalyzed.Finally,basedonthecharacteristicsoftheoperatingpoweroftheVSPSUafterLOEandthecorrespondingrelationshipwiththeimpedance,thecriterionofthedownwardthrowingimpedancecircleisproposedformachine-sidesymmetricalLOEfault;basedonthereflectioncharacteristicsofDCvoltageonthedamageofrotor-sidepowerexchangechannel,aDCvoltagecriterionforgrid-sidesymmetricalLOEfaultisproposed.ThecombinationofthetwoformsaprotectionschemeagainstthesymmetricalLOEfaultoftheVSPSU.Theresearchhasthefollowingconclusions:(1)WhenasymmetricalLOEfaultoccursonthemachineside,theoperatingpoweroftheVSPSUwillquicklydroptotheoperatingpowerpointoftheLOELeadingPhaseOperation.Atthistime,theVSPSUisnolongerundercontrolandwillabsorbalargeamountofreactivepowerfromthegrid.WhenasymmetricalLOEfaultoccursonthegridside,itwillhavedifferentcharacteristicsoftheLOEfaultbasedondifferentrotoractivepowerflowdirections,butallofthemwillcausetheDCcapacitorvoltagetojumpordrop.ThesymmetricalLOEfaultofVSPSUwillcauseharmtothepowergridandtheunititself,soitisnecessarytobeequippedwithLOEprotection.(2)ThetraditionalLOEprotectionschemebasedonastaticallystableboundaryimpedancecircleandasynchronousoperationimpedancecirclehasmisoperationandrefusaltooperatewhenappliedinVSPSU,whichcannotmeetthereliabilityrequirementsofVSPSUforLOEprotection.(3)ThePSCAD/EMTDCsimulationresultsshowthattheproposeddownwardthrowingimpedancecirclecriterionandDCvoltagecriterioncaneffectivelydetectthesymmetricalLOEfaultofVSPSUundervariousoperatingconditions,andmeetthereliabilityrequirementsofVSPSUforLOEprotection.
作者：卢庆辉 尹项根 乔健 王义凯 尹昕 Author：LuQinghui YinXianggen QiaoJian WangYikai YinXin
作者单位：强电磁工程与新技术国家重点实验室(华中科技大学)武汉430074长沙理工大学电气与信息工程学院长沙410114
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(5)
分类号：TM312
关键词：变速抽蓄机组 交流励磁 失磁故障 失磁保护 保护可靠性
Keywords：Variablespeedpumpedstorageunits ACexcitation lossofexcitationfault lossofexcitationprotection protectionreliability
机标分类号：TM711TM315TM407
在线出版日期：2024年3月19日
基金项目：国家自然科学基金，中央高校基本科研业务费专项资助项目变速抽蓄机组失磁故障分析及保护研究[
期刊论文] 电工技术学报--2024, 39(5)卢庆辉 尹项根 乔健 王义凯 尹昕变速抽蓄机组(VSPSU)的励磁及控制方式复杂且易发生失磁故障,配置针对性的失磁保护对保障其安全运行至关重要.该文基于直流励磁系统和交流励磁系统的差异分析,将VSPSU的失磁故障划分为对称失磁和不对称失磁两种故障形式...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
变速抽蓄机组失磁故障分析及保护研究 Study on Loss of Excitation Fault Analysis and Protection of Variable Speed Pumped Storage Units
变速抽蓄机组失磁故障分析及保护研究.pdf
- 文件大小:
- 2.08 MB
- 下载次数:
- 60
-
高速下载
|
