Topology Design of±800 kV/10000 MW HVDC Transmission for Inland Large-scale Renewable Energy Bases
Developing large-scale renewable energy bases is one of the key tasks in the national 14th Five-Year Plan of modern energy systems.Aiming at transmitting large-scale hydropower and photovoltaic power in southeast Tibet,con-sidering the high altitude of the energy base and the limited transmission corridor,we design the topologies of the±800 kV/10 000 MW heterogeneous serial high voltage direct current(HVDC)transmission system,the four-terminal modular multilevel converter(MMC)based HVDC system with multiple DC voltage levels,and the four-terminal hybrid HVDC,respectively.Aiming at transmitting wind power and photovoltaic power in the desert,barren and Gobi areas,we propose the±800 kV/10 000 MW three-terminal MMC-HVDC system,four-terminal MMC-HVDC system,and hetero-geneous serial HVDC system with multiple DC voltage levels.Finally,the simulation models of each topology are built using PSCAD/EMTDC.And the technical characteristics of each topology are compared and analyzed.The research of this paper may provide a reference for the topology design of related engineering practices in the future.
renewable energy integrationmodular multilevel converter-based HVDCline commutated converter based HVDCconverter topologyoverhead line transmission
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