On March 29, the Wudongde Power Station invested and constructed by China Southern Power Grid Corporation was sent to Guangdong Province for the UHV multi-terminal DC demonstration project approved by the National Development and Reform Commission. On March 29, the Wudongde Power Station invested and constructed by China Southern Power Grid Corporation was sent to Guangdong Province for the UHV multi-terminal DC demonstration project approved by the National Development and Reform Commission. The project is a key trans-provincial transmission project and a national major innovation demonstration project proposed by the National Electricity Development “13th Five-Year Planâ€. After completion, it will create many world firsts: the world's largest UHV multi-terminal DC transmission project, the world. The first UHV multi-terminal hybrid DC project, the first UHV flexible DC converter station project, and the first flexible DC transmission project with the DC fault self-clearing capability of overhead lines. The project plans to build ±800 kV UHV three-terminal DC, with a transmission capacity of 8 million kilowatts, send 5 million kilowatts to Guangdong, and send 3 million kilowatts to Guangxi. The delivery end is Luquan County, Kunming, Yunnan, and the receiving end is Longmen County, Huizhou, Guangdong. And Luzhai County, Liuzhou, Guangxi, the total length of the line is about 1489 kilometers, passing through Yunnan, Guizhou, Guangxi, Guangdong four provinces (districts). The project is scheduled to be put into operation in 2020. It will be completed and put into operation in 2021. By then, 8 million kilowatts of Yunnan clean water and electricity will be sent to Guangdong and Guangxi. The annual electricity supply will exceed 32 billion kilowatt hours, and the annual coal consumption will be reduced by 9.2 million tons. The emission of 24.5 million tons is of great significance for further promoting the elimination of clean energy such as Yunnan hydropower, ensuring the supply of electric power in Guangxi, protecting the ecological environment, and helping to fight pollution prevention. As the world's first UHV large-capacity multi-terminal hybrid DC transmission project, its capacity exceeds the existing UHV multi-terminal DC project with a maximum capacity of 6 million kilowatts in the world - Northeast India - Agra transmission line project. Compared with conventional DC, multi-terminal DC breaks the inherent mode of connecting only two points, forming an online multi-point connection layout, reducing the mileage of the line construction, the number of commutation stations, etc., and improving economy. “Mixed†is embodied in the conventional DC and the flexible DC technology at the receiving end. There are two UHV flexible DC converter stations in the project, which are located at the two receiving ends. The DC fault self-cleaning capability and flexibility of the overhead line The application of the DC system can improve the safety, stability and flexibility of the grid operation. It is understood that the preliminary work of the project is the most complicated in the similar projects. The technical solution demonstrates for the first time the application of UHV multi-terminal DC, UHV flexible DC, UHV conventional DC and flexible DC hybrid systems, UHV flexible DC long-distance overhead lines, etc. Innovative work has been passed through repeated research and argumentation. The project has great demonstration significance, which is conducive to China's occupation of the commanding heights of UHV multi-end and flexible DC transmission technology, and enhances the safety, stability and economy of power grid operation under long-distance, large-capacity and multi-power conditions. In the long run, it will be a large-scale in the future. The development and integration of renewable energy bases provide strong technical support. Behind an approved document “The project has been approved by the National Development and Reform Commission!†Hu Rong, director of the planning department of the UHV company and secretary of the party branch, told the reporter about the efforts of the team members in the preliminary work of the Wudongde power station to transmit power to the Guangxi DC transmission project in Guangdong. To the tone, she was happy to share this good news with the reporter. The reporter noticed that the female party member who had experienced major projects such as Yunguang and Northwest Yunnan had a red-hot eye and paused for more than 20 seconds before adjusting her mood. She is well aware that behind this document, it is full of the hard sweat and heavy contributions of the early team of Wudongde Engineering. "A lot of difficulties need to be overcome. It is normal to get off work after 9:00 every night." "Per capita travel is more than 150 days, and more than 200 times are coordinated externally." "Write more than 900,000 words of various materials"... Members say. A project approval relies on a layer of foundation The document entitled "Reply from the National Development and Reform Commission on the Approval of Wudongde Power Station Power Transmission Guangdong Guangxi UHV Multi-terminal DC Demonstration Project" has 4 pages, and the remaining part is a list of 18 supporting documents. Under these documents, there are countless more approval documents. This pioneered several world-class super power transmission projects across 41 provinces (districts) in 16 provinces (districts). According to the statistics of UHV, the team only obtained 510 copies of the path agreement. Guangzhou Lufeng Electronic Technology Co. , Ltd. , https://www.lufengelectronics.com