Science and Technology Daily reporter Chen Yu
On June 10, the Hami-Chongqing ±800 kV ultra-high voltage DC transmission project (hereinafter referred to as the Hami-Chongqing Project) of State Grid Co., Ltd. was put into production and transmission. This is the first external UHV DC transmission project of the Shagohuang New Energy Base to be put into production and transmit power. It is the first UHV DC receiving project in the southwest region. is of great significance to promoting the development and export of Hami's energy resources, promoting the large-scale optimal allocation of clean energy, improving Chongqing's power supply guarantee capacity, and helping to achieve the "dual carbon" goal.
Hami-Chongqing project starts from the Balikun converter station in Hami City, Xinjiang Uygur Autonomous Region, passes through Gansu, Shaanxi, and Sichuan, and ends at the Yubei converter station in Yubei District, Chongqing. It adopts the "double 800" ultra-high voltage DC transmission technology with a rated voltage of ±800 kV and a rated capacity of 8 million kilowatts. The transmission distance is 2,260 kilometers and a total investment of 28.6 billion yuan. As the first batch of large-scale new energy base transmission projects in my country, the project is equipped with a 14.2 million kilowatt power supply, located in the Gobi base on the northern foot of the Tianshan Mountains in Xinjiang. The installed capacity of wind power, photovoltaics, and solar thermals reaches 10.2 million kilowatts, and the installed capacity of new energy accounts for more than 70%.
The project was approved by the state in July 2023. Faced with the challenges of harsh construction environment, crowded lines and corridors, and many crossings, State Grid Corporation has mobilized the entire company to promote the construction of the project. It took 22 months, from the foot of the Tianshan Mountains to the shore of the Yangtze River, from the Yellow Sha Desert to the Bashan Yushui River, on the territory of the motherland, a "energy artery" that stretches thousands of miles and runs across the north and south.
It is understood that the project can support the reliable delivery of new energy with installed capacity of more than 10 million kilowatts in Hami area, helping Xinjiang to form a "two intersection and three direct" transmission channel with a transmission scale of more than 30 million kilowatts, covering the power grids of Northwest, Central China, East China and Southwest, and will effectively improve the level of new energy consumption and utilization.
Hami-Chongqing project adopts the latest "Double Eight Hundred" UHV DC standardization technology achievements to actively respond to challenges such as severe cold climate, strong wind vibration, wide distribution of saline soil and Gobi gravel soil. The construction team has designed a jumper string in strong wind zones and multiple degrees of freedom to adjust the distance clamps. It pilots the application of silane impregnation and anti-corrosion technology in strong corrosion areas, and innovatively carry out surface gravel curtain peeling in Gobi gravel soil area. After the project is completed, the gravel curtain will be replied to effectively prevent and control soil erosion. The application of various new technologies and processes has improved construction efficiency, solved construction problems, created a new benchmark for ultra-high voltage construction, and provided effective reference and reference for subsequent ultra-high voltage engineering construction.
Editor: Guo Xuanwei
Audit: Zhu Li
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