As of May 19, the world's first ±800 kV UHV DC demonstration project, which was built and operated by China Southern Power Grid Corporation, has exceeded 200 billion kWh of power transmission from Yunguang UHV DC transmission project. The first direct current transmission channel with a power supply exceeding 200 billion kWh.
The Yunguang UHV DC transmission project is a key project of the national “Eleventh Five-Year Plan†construction and an autonomous demonstration project for UHV DC transmission. The project was completed and put into operation in June 2010, mainly to clean water and electricity from Yunnan Minjiang and Jinsha River basins. Dissipated to the Pearl River Delta region of Guangdong. In the years of operation practice, China Southern Power Grid Corporation has mastered the key technologies of UHV DC construction and operation. Since the project was put into operation, the annual energy availability rate has reached a high level of over 95%, laying a foundation for stable power transmission. . In the past five years, the average annual utilization hours of the project reached 5,677 hours, which is higher than the design value of 13%. In 2014, the maximum reached 5,964 hours, becoming the UHV DC project with the highest utilization rate in the domestic channel.
Relying on the Yunguang UHV DC transmission project, China Southern Power Grid Corporation successfully developed a set of UHV DC design software tools, mastered the core technologies of system research and complete set design, and provided technical support for the subsequent construction of UHV DC project. Up to now, China Southern Power Grid Corporation has built a total of three UHV DC transmission projects, with a transmission capacity of 15 million kilowatts. It can transport Yunnan's clean water and electricity to more than 70 billion kilowatt-hours per year in Guangdong, equivalent to reducing coal combustion by more than 20 million tons. The discharge of carbon dioxide is 54 million tons and sulfur dioxide is about 400,000 tons. It plays an important role in optimizing the allocation of resources in the east and the west, ensuring the removal of Yunnan's clean water and electricity, and promoting the prevention and control of atmospheric pollution in Guangdong.
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