Based on the difficulty in selecting a site to build converter station in the high mountain and valley areas of Tibet

This paper study on the compactness of the±800 kV large capacity flexible DC converter station at an altitude of 4 000 m was made

according to the power distribution equipment of the±800 kV flexible DC converter station and the characteristics of its site layout after studying and analyzing the current situation of the DC technology routes and the various researches on the compact DC main equipment in China.Meanwhile an approach for the vertical layout of the UHV flexible DC converter station was proposed

which could also be used to modularize the various functional regions and optimize the spatial layout of the flexible DC converter station to reduce the floor area of the large capacity UHV flexible DC converter station and decrease the difficulty in site selection.In this way

the site utilization rate will be increased significantly.Hence our research has much important economic and social benefits in promoting the delivery of clean energy in Tibet and implementing the national requirements on energy conservation and emission reduction.