The Northwest DC project was put into full operation. Li Pin/photo
On May 18, the highest altitude in the world, the UHV DC transmission project with the highest seismic protection level—the ± 800 kV UHV DC transmission project in Northwest Yunnan and Guangdong (abbreviated as the “Northwest UHV DC project”) was put into full operation. After the operation, it can send 20 billion kWh of clean hydropower each year, which accounts for about one-fourth of Shenzhen's annual electricity consumption. This will not only meet the demand for the coordinated economic development of the southern region, but also provide a continuous supply of water for the construction of Guangdong, Hong Kong, and Macao Bay Area. Clean power.
Cloud power delivery capacity added 5 million kilowatts
It is understood that the UHVDC project in the northwest of Yunnan Province is from Jianchuan County, Dali Prefecture, Yunnan Province in the west, spanning Yunnan, Guizhou, Guangxi, and Guangdong. The total length of the line is about 1,953 kilometers, which is the first spot of Shenzhen West Power Transmission to Shenzhen. 2. The HVDC project is also the third UHV DC link from China Southern Power Grid to the west.
On December 27 last year, the project was put into operation at the low end of the bipolar project and began to deliver clean hydropower to the Pearl River Delta load center. After the project was fully put into operation, the new West-to-East power transmission capacity was 5 million kilowatts, which could consume Yunnan hydropower 200 annually. Hundred kilowatt-hours, can reduce the consumption of 6 million tons of standard coal in the Pearl River Delta region, reduce carbon dioxide emissions by 16 million tons, equivalent to 16 million hectares of tree planting.
Overcome many world-class problems
According to reports, the project was built and managed by China Southern Power Grid EHV Transmission Co., Ltd. From the start of civil construction to full completion and commissioning, it was less than two years ago. It is the first UHV DC project in the world - Yunnan-Guangdong ± 800 kV UHV DC transmission. The demonstration project has been shortened by 12 months.
In addition, a number of world-class challenges brought about by the combination of high altitude and high seismic intensity are technically overcome. For example, the Xinsong Converter Station is 2,350 meters above sea level, the highest in the world; the seismic design of electrical facilities reaches 9 degrees, the highest in the world; The line spans 3600 meters above sea level, the highest in the world.
'A number of scientific research, design, manufacturing, and construction units within the United Nations have carried out a large number of technical researches and formed the world's first high-elevation, high-intensity seismic intensity UHV converter station solution package solution. It has led and demonstrated similar projects. Role.' Li Qingjiang, deputy general manager of China Southern Power Grid EHV Transmission Co., Ltd. introduced.
West-East power transmission capacity will exceed 55 million kilowatts
Up to now, China Southern Power Grid Corporation's West-East Power Transmission has formed 'eight exchanges, ten DC's, a total of 18 channels of 500 kV and above West-to-East power transmission, with a maximum transmission capacity of more than 47.5 million kilowatts, and an annual transmission capacity exceeding 200 billion yuan. Kilowatt-hours, accounting for one-third of Guangdong's annual electricity consumption, of which hydropower accounts for more than 80%. The five provinces in the south accounted for more than 50% of clean energy production.
The West-East Power Transmission has become one of the most direct, strongest, and closest economic and social cooperation methods in the five southern provinces. It optimizes the allocation of resources, promotes regional coordinated development, and achieves a harmonious and win-win situation between the eastern and western regions, and promotes a low-carbon economy. Development and ecological environment improvement play a very important role.
During the “Thirteenth Five-Year Plan” period, China Southern Power Grid Corporation will also build the world’s first UHV multi-terminal hybrid DC project, the Kunliulong DC project. By the end of 2020, the maximum transmission capacity of the West Power Transmission to the South will be more than 55 million kilowatts. Increased by 16.8% from the current level, to further promote the optimal allocation of resources in the eastern and western regions, and to support the development of a green and low-carbon economy.