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ID:33072176
大小:4.45 MB
页数:66页
时间:2019-02-19
《电气化铁路牵引网分区段供电与测控方法分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、万方数据西南交通大学硕士研究生学位论文第1I页AbstractBecausethatthetractionnetworkintheelectrifiedrailwaytractionpowersystemiSahuge,complicatedpowersupplydevicewhoseworkingconditionsareverypooranditisplaceddirectlyinthenatureenvironmentandhasnostandbypower.Somosttractionpowersystemfault
2、sOccurinthetractionnetwork.Thereforeitisveryimportanttofindandseparatethetractionnetworkfaultsintimeandaccuratelyforfurthestguaranteeingthenormalpowersupplyofthetractionnetworkno·faultssection.Thisthesisanalyzethetractionnetworksectionpowersupplyandmeasurementsyste
3、mbysectioningthetractionnetworkreasonably,whichCanseparatethefaultssectionquicklymeanwhilefurthestguaranteethenormalpowersupplyoftheno—faultssection.Besides,thismeasurementsystemusesthefaultpowerflowsymbolvaluebaseddistributedmeasurementsystemasthemainprotection,us
4、esthefaultpowerflowsymbolvaluebasedcentralizedmeasurementsystemasthestandbyprotection.Thetwoprotectioncooperateswitheachothertoimprovethereliabilityofthemeasurementsystem.Firstly,thisthesisdescribesthetractionnetworksectionschemeandthestructure,workingtheoryoftheme
5、asurementsystemindetail.Thepowersupplysection,thefaultpowerflowdirectionandthefaultpowerflowsymbolvalueisdefined.TheadvantageofthefaultpowerflowsymbolvaluebasedidentilyingthetractionnetworkshortcircuitfaultiSintroduced.Accordingtotheworkingtheoryofthewholemeasureme
6、ntsystem,everycomponentofthemeasurementsystemismodelledintheMatlab/Simukink.Thenthetractionnetworkmeasurementmodelsofsingletrackdirectsupply,twotracksdirectsupplywithterminalinparallel,singletrackdirectsupplywithtwosidessupply,twotracksdirectsupplywithtwosidessuppl
7、yareestablished.TheT-Rshortcircuitfaultisdeduced.Theperpetualandinstantaneousshortcircuitfaultsaresimulatedinthebuiltmodels.Thefeasibilityandaccuracyofthemeasurementsystemisverifiedbyanalyzingthefaultpowerflowsymbolvalueofeachterminal,thecommandsofthebreakerandthev
8、oltagebetweenthetwosidesinthefaultsectionbeforeandafterthefault.Intheend,thefaultlocationmethodisproposedcombiningwiththedistanceprotectiontoguar
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