Innovation of UHVAC Transmission Technology in China

UHV AC transmission refers to the alternating current transmission at voltage of 1000 kV and above.It is a kind of resource saving,environmental friendly and advanced transmission technology,which has the advantages for power transmission of large capacity,long distance,low power loss,less land occupation,etc.Based on Jindongnan-NanyangJingmen 1000 kV AC demonstrating project,this paper present the innovation of UHV AC transmission technology in China,which focus on voltage control,secondary-arc current mitigation,external insulation coordination,electromagnetic environment control,experimental technique,development of UHV equipment,system integration,commissioning and operation of UHV AC project etc.It’s very helpful for development of UHV grid by promotion and application of this new technology.