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1、华北电力大学硕士学位论文AbstractBecausetheoriginofenergyandthecenterofloadinChinadistributedunevenly,soweneedstrongsupportsfromUHVpowergridforwhetheritisthetransmissionofalargecapacity,longdistanceenergy,ortheallocationofresourcesoptimization,aswellaslargescaleaccesstonewenergysourcesandhazegovernance
2、.However,theUHVtransmissionlinesneedtolinecorridorwider,butalsobythegeographicalconditionsandenvironmentprotectionlimits.ComparedwiththetraditionalUHVdouble-circuittransmissionsystem,UHVsixphasetransmissionsystemhastheadvantageofhighpowertransmissiondensity,narrowlinecorridoroccupancyandlo
3、wgeneralconstructioncosts，sotheapplicationofthesix-phasetransmissiontechnologytoUHVtransmissionwillbeagoodchoice.Inthispaper,themaintechnicalfeaturesandcharacteristicsareanalyzedanddiscussedindetail,providingatheoreticalbasisfortheeconomy,feasibilityandfurtherstudyofUHVsix-phasetransmissio
4、nsystem.ThispapertaketheHuainan-Shanghaidouble-circuittransmissionlineasareference.Thenthetypicalsizeoftowerisdesignedandthebundleconductortypeaswellasinsulatorlengthisselectedforthesix-phasetransmissionsystem.Basedonthis,theelectricalparametersofUHVsixphasetransmissionlineswerecalculated,
5、andthedistributedparameterequivalentcircuitmodelareestablished.Then,thepowertransmissioncharacteristics,unbalancedegree,themaximumconductorsurfaceelectricfieldintensityandthespaceelectricfielddistributionabovethegroundarecalculated.Comparisonandanalysisonthecalculationresultsforsix-phasetr
6、ansmissionlineandthosefordouble-circuittransmissionlinewithcorrespondingvoltagelevelsareperformed.AnalysisresultsshowthatUHVsix-phasetransmissionlineshavehigherpowertransmissiondensity,alsotheunbalancedegree,theconductorsurfaceelectricfieldandthespaceelectricfieldofsix-phasetransmissionlin
7、earebetterthanthoseofdouble-circuittransmissionline.And,boththeeconomicperformanceandtheenvironmentalperformanceofsix-phasetransmissionlinearebetter.Keywords:UHV;six-phasetransmission;powertransmissioncharacteristics;unbalancedfactor;frequencyelectricfieldII华北
