On the morning of January 18, 2022, the rotor of the last million-kilowatt hydropower unit (No. 9) of the Baihetan Hydropower Station, the second largest hydropower station in the world with installation and commissioning undertaken by China Energy Construction Gezhouba Electromechanical Company, was hoisted into place, marking the The rotors of the 16 million-kilowatt hydropower units in the hydropower station were all installed.

At 9:18 a.m. on January 18, 2022, with the command of the China Energy Construction Gezhouba Electromechanical Company, the No. 9 rotor with a diameter of 16.5 meters, a height of 4 meters and a lifting weight of 2,300 tons was placed in the right bank of the Baihetan Hydropower Station. The installation station is "grabbed" by two 1,300-ton bridge cranes in parallel, slowly lifted 6.5 meters off the ground, and then "walked" at a steady and uniform speed to the top of the No. 9 engine pit and slowly dropped, safely and smoothly with the generator The precise docking of the shaft and the thrust head took 60 minutes, 57 days ahead of the planned construction period.

The rotor of Unit 9 began to be installed on July 19, 2021. After bracket assembly and welding, yoke lamination shrink-fit, magnetic pole hanging and other installation links, the rotor installation was completed on January 15, 2022, and the cylindricity after the magnetic pole was assembled was not uniform. More than 0.30 mm, the perpendicularity of the magnetic poles does not exceed 0.26 mm, and the concentricity between the magnetic poles and the rotor does not exceed 0.053 mm (only the diameter of a hair), and the technical indicators are better than the quality set standards formulated by the Three Gorges Group.

Baihetan Hydropower Station is the largest and most technically difficult hydropower project under construction in the world. It is the second cascade hydropower station developed in the lower reaches of the Jinsha River at the junction of Ningnan County, Sichuan Province and Qiaojia County, Yunnan Province. It is a global hydropower station. The hydropower station with the largest unit capacity and the second largest installed capacity is invested and constructed by the Three Gorges Corporation. A total of 16 nationally produced hydro-generator units with a single unit capacity of 1 million kilowatts are installed in the power station, which are evenly distributed on the left and right banks. Among them, the 8 million kilowatt units on the right bank are developed by Harbin Electric Motor. The installation and commissioning of the turbo-generator set and its ancillary equipment, the single-unit capacity has reached one million kilowatts, bringing the world's hydropower into the "million-unit-unit era".

During the installation and construction of the 8 units on the right bank, China Energy Construction Gezhouba Electromechanical Co., Ltd. adhered to the new development concept, bravely climbed the new peak of science and technology, always locked the quality standard of “Taitai Excellent” for unit installation, and actively carried out the QC group technology for the installation of mega-kilowatt rotors. Innovate to tackle key problems, and create high-quality units with high standards and high quality. After fully studying the structure of the rotor's auxiliary rib, the innovative "auxiliary rib group welding technology" was proposed and implemented, which significantly improved the rotor assembly quality and machining accuracy, and reduced the construction period. It was first issued on June 26, 2021. The first kilowatt-hour electricity of the world's first million-kilowatt unit, the first successful start-up of a million-kilowatt hydropower unit, the first to connect to the grid, the first to export electricity to the national grid, and the first to pass 72 The "four firsts" of the hourly trial run test.

After all the hydropower units are put into operation, the annual average power generation is 62.443 billion kWh, which is equivalent to saving about 19.68 million tons of standard coal and reducing carbon dioxide emissions by 51.6 million tons each year. At the same time, it will form the world's largest clean energy corridor together with the Three Gorges, Gezhouba, Wudongde, Xiluodu, Xiangjiaba and other hydropower stations on the Jinsha River, and will play an important role in China's achievement of carbon peaking and carbon neutrality.Editor/Ma Xue