500kv超高压交流系统操作过电压仿真分析

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1、分类号：密级：中文论文题目：英文论文题目：洳≥：JI唼单位代码：!Q墨墨墨学号：Z074幽堡l鲤硕士专业学位论文逝逛太堂亟±堂笪途塞垒堡鲤坠盟ABSTRACTResearchesonswitchingsurgesareconnectedtightlywiththedevelopmentofelectricpowersystem．Atthebeginningofthedevelopment，overvoltagecausedbySingle——phaseintermittentgroundingarcmakesthemostsetiousdisasterbecauseofneu

2、tral—pointnon—groundingsystem，SOthattheresearchonitbecomesmostimportant．Aftertheneutra卜pointofsystemiSgrounding，asthegradeofratedvoltageandthelengthoftransmiSSion1ineandthetransmiSSioncapacityare1ifted，overv01tageofswitchingofftransformersand1inesofno。。loadoperationbecomesverysetious．Becaus

3、eoflessovervoltageenergyofswitchingofftransformersofno-loadoperation，whichcanreleasedbyUSing1ightingarresters，theresearchonswitchingoff1inesofno’-loadoperationbecomesmostimportant．Recentyears，becauseofthedevelopmentofextrahighvoltageandtheconstructionoflongdiStancetransmiSSion1ines，switchin

4、gsurgeshavenewchanges，suchasthecapacitanceeffectoflongdistancelineofno-loadoperationwillmakeaveryhighriSingofvoltage，onthebasisitmakesswitchingsurgesofveryhighamplitude，andSOasthereclosing．AstheimprovingofbreakersandUSingofreactors，theamplitudeofovervoltageandtheprobabilityariSingovervoltag

5、eofswitchingofflinesofno—loadoperationarereducedobviously，SOthatswitchingin1inesofno—loadoperation，andSOasthereclosing，becomesoneofthemosttypicalandseriousswitchingsurgesintheextraandultrahighvoltagegrid，andthemostimportantresearchtarget．Switchingsurgesarenotonlyrelatedtotheoperatingmodesof

6、powersystembutalSOtotheallocationsandperformancesandparametersofdevicesinthesystemtightly．Theovervoltage1evelSaredifferencesduetodifferentsystemconditions，SOtheswitchingsurgesinextrahighvoltagegridbecomesoneofthemostimportantresearchtarget．First，theprincipleandinfluencingfactorsand1imitingm

7、easuresofcommonswitchingsurgesareintroducedinthepaper．Then，thebasicIll逝婆太堂亟±堂焦途塞△堕：!坠塑：elementsofPSCAD／EMTDC(switchingsurgesSimulatingsoftware，Version4．0．2)areintroduced．Basedonthe500kVtransmiSSion1inesinZhejiangprovincialpowersystemaswitchingsurgesequiv