Power Sent from North Hebei to Xiong'an New Area

The Zhangbei-Xiong'an 1,000kV ultra-high voltage (UHV) alternating current (AC) power transmission and transformation project, developed by State Grid Corporation of China, went into service after a 72-hour trial operation on Aug 29.

Starting from the new energy base in Zhangjiakou in North China's Hebei province the project is a main power supply line to guarantee clean electricity in the Xiong'an New Area.

The only renewable energy demonstration zone approved by the State Council in China, Zhangjiakou is home to rich new energy sources.

The installed capacity of new energy in Zhangjiakou is about 20 million kilowatts and is predicted to reach 50 million kW in 2030.

Construction of the project started in April 2019. With a total investment of 5.98 billion yuan ($ 876.07 million), the 315-kilometer power line has double circuits.

The 1,000kV UHV AC controllable paralleling reactor was developed for the project. Its power can be automatically adjusted according to different reactive voltages, which is significant in improving voltage control as well as maintaining a flexible and economic operation of a UHV AC system.

As the line passes over the Yanshan and Taihang mountains, nearly 70 percent of its sections were built in regions with complicated landform like hills where transport and engineering were quite difficult to conduct.

What's worse is that Zhangjiakou lies in North China where the winters are longer, making construction periods shorter than six months.

The power line also goes across some UHV power lines and passes over railways and highways as well as some ruins of the Great Wall, which added difficulties to the engineering.

The steel tower to support the line section passing the Wulonggou Great Wall is 211.6 meters high and weighs about 740 tons, the highest and heaviest among UHV towers built in mountains.

The Zhangbei-Xiong'an 1,000kV UHV AC project is scheduled to be a major part of the smart power grid network in Xiong'an New Area and will be a strong support for clean energy power supply to the area.

A view of the Zhangbei-Xiong'an 1,000kV UHV AC power transmission and transformation project during construction [Photo/sasac.gov.cn]

Technicians install and adjust the transformer substation facilities. [Photo/sasac.gov.cn] 

(Executive editor: Wang Ruoting)