电气化铁路双边供电对电力系统的影响分析

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1、西南交通大学硕士研究生学位论文第1I页AbstractTherapiddevelopmentofelectrifiedrailway,itnotonlyplaysasignificantroleinsolvingourtensetransportcapacitybutalsoisallimportantinfluencefactorforthedevelopmentofthenationaleconomy．Therefore，itisverynecessarytoresearchsomeproblemsofelectrifiedrailway．Inb

2、ilateralACelectrifiedrailways，theauto-passingphaseseparationsystemofsectionpostcanbereduced．Itisconducivetohigh-speeddriving．Theexistingsupplycapacityandreliabilitywillbcfurtherincrease，relativetounilateralpowersupply．ThebilateralACelectrifiedrailwaysisbetterthanunilateralACele

3、ctrifiedrailwaysinengineeringinvestmentandoperationefficiency．Meanwhile，itisalsoaeffectivemethodthatCanexpandelectrifiedrailwaytransportcapacityandstrengthenthepowersupplyreliability．BilateralACpowersupplyshowedtheincomparableadvantagesbecausethatthetractionnetworkvoltagecanbei

4、mprovedandpowerconsumptioncanbedecreasedtoensureenoughspacingbetweentractionsubstation,alsotheinvestmentofmodificationandconstructionCanbereducedifthemodeisadopted．Firstly,theimpactofbilateralACelectrifiedrailwaysonpowersystem’Srelayprotectionequipmentwhichisanalysedinthispaper

5、．TheconclusionindicatesthattheimpactofbilateralACelectrifiedrailwaysonpowersystem’Srelayprotectionwhichcouldbeignored，throughanalysisandcalculation,whenpowersystemfailureoccurs．Thesettingvalueoftractionpowersystem’Srelayprotectiondevicewhichisneedtoberesetwhenmetallicgroundshor

6、tcircuitfaultOccurstothetractionpowersupplysystem．Thetractionpowersystem’Srelayprotectiondevicecarlactaccuratelyandhavenoeffectingonnormaloperationofpowersystem’Srelayprotectionafterrescuing．Secondly,theproblemofnegativesequencecurrentisconsideredinthispaper．Theexpression．ofneg

7、ativesequencecurrentisdeducedwhenthetransformerisconnectedasV／vconnection．Afterward，theactualexampleiscalculated，theresultshowsthatthenegativesequencecurrentinbilateralmodeislargerthantheoneinunilateral．Finally,thebilateralACelectrifiedrailwaysissimulatedwithMATLAB／Simulink，and

8、theresultoftheoreticalanalysisisprovedtoberight．Thenth