Abstract
As the main transmission modes of global energy interconnect, studies on the application scope of economic transmission of ultra-high voltage DC (UHVDC) is of great significance to the scientific planning of power grids. This paper analyses the development trend of global energy interconnect in light of the trend of renewable energy development. Based on the study of the calculation method of annual cost per unit capacity of UHVDC transmission, a calculation method for the application scope of economic transmission is proposed. The UHVDC transmission configuration scheme is studied, the factors that affect the transmission loss of UHVDC project is analysed. On the basis of the unit-capacity annual cost method, taking into account changes in the different distance and power price of the UHVDC project, the economic transmission scope of ±800kV and ±1100kV voltage levels are also analysed.
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