Under the demand of clean and low-carbon power consumption, the construction of energy interconnection poses new challenges to clean energy power access and transmission technologies, which needs to solve key technical problems in complex scenarios such as the access of different clean energies, the interconnection of strong and weak power systems, and the operation control of complex network topology, in order to improve the system reliability and power quality, as well as transmission capacity and operational stability of large-scale AC-DC hybrid power grids. This paper sorts out various power transmission scenarios under Global Energy Interconnection (GEI), summarizes the needs of advanced transmission technologies, and proposes the key technologies including IGCT-based UHV VSC DC transmission, storage-based active DC power transmission, and wide DC grid. Europe is taken as an example to make a DC power grid simulation model research to verify the feasibility and applicability of the above advanced transmission technologies.

UHV VSC power transmission;Active power transmission;DC power grid;Global Energy Interconnection (GEI);European DC power grid simulation