输电走廊雷电过电压特性与其影响规律分析

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1、西南交通大学硕士研究生学位论文第

2、I页AbstractWiththeblossomdevelopmentofUHVengineeringinChina，theheightoftransmissiontower,thetransmissioncapacityandthetransmissiondistancegethighlyexpanded．Alongwiththeseachievements，lackoflandresourcebecomesaproblem．Placeforoverheadtransmissionlinesdecre

3、aseswhilethecouplingeffectbetweenUHVACandUHVDCtransmissionlinessharingthesanqecorridorbecomesstriking．What’Smore，theUHVtransmissionsystemalwayslocatesinthewild，itseasytogetlightningstrokewhichmaycauseregionalblackout．Inordertodrawupmoreeconomicalandrationallightningprote

4、ctionmeasurestopreventlightningfault，itisnessecarytolookdeeperintotheresearchofthelightningpropertiesanditspropagation，bywhichtofindoutthekeyinfluencefactoronovervoltagedistribution．BasedontheoperationexperienceofUHVAC／DCtransmissionsystemsandtheoccurancemechanismoflight

5、ningovervoltage，alightningsimulationmodelofUHVAC／DCtransmissionlinessharingthesamecorddoriSestablishedwiththehelpofPSCAD／EMTDC．What’Smore，themodelingprocessofsubsystemssuchaslightningcurrent，transmissiontower,flashovermodelandtransmissionlinesisexpressedindetail．Lightnin

6、govervoltageiscalculatedinthesituationofshieldingfailure，backstrikingandthesituationwhentransmissioncorridorgetlightningstrokewithoutblackout．Byanalyzingthecalculmedresults，thetransmissionprocessoflightningovervoltagethroughthecorridorisimimted，bywhichtogetthedistributio

7、nandtransmissioncharacteristicsoflightningovervoltage．Lastbutnotleast，theinfluenceontheabovecharactersticscausedbyimpulsecoronaisdiscusseddetailly．Inthesimulationmodel，howtheovervoltageinthecorridorischangedbytheinfluenceoflightningcurrentwaveformandampilitude，typeoftran

8、smissiontowerandgroundingresistanceisstudiedindepth．Theanasisresultsshowthatthelightningcurrentwaveformandampilitude，typeoftransmissiontowerandgroundingresistanceCangiveaffectthebackstrikeovervoltage，whiletheshieldingfailureovervoltagegetsaffectedonlyfromethechangingofli

9、ghtningcurrentwaveformandamplitude．TheachievementsinthsessayCanberegardedassummaryandprospectofthelight