Economic Comparison of HVDC Voltage Class Sequence

A method for comparative research on unit capacity transmitted upwards to main power grid from ±1000 kV, ±800 kV, ±660 kV and ±500 kV HVDC systems respectively is proposed. The economic laws of HVDC systems in different voltage class are analyzed, and the economic power transmission distances of HVDC power transmission technologies for different voltage classes are estimated and calculated. Calculation results show that the economic power transmission distance of ±500 kV HVDC system is less than 1100 km, the economic power transmission distance of ±660 kV HVDC system is within the range from 900km to 1700 km, the economic power transmission distance of ±800 kV HVDC system is within the range from 1200km to 2700 km, and that of ±1000 kV HVDC system is farther than 1800 km. The content of this paper is significant in the standardization of long distance high capacity HVDC power transmission technology in China and the exertion of scale benefit as well as energy saving and consumption reduction in power grids, and is available for reference in similar researches.