Interpretation of key technologies for escaping UHV DC transmission

On June 9th, an important academic conference took place in Beijing. During the opening ceremony, President Xi Jinping emphasized that mastering key technologies is essential for securing a competitive edge and driving sustainable development. His remarks highlighted the significance of technological self-reliance in shaping China's future. This summer, the two major UHVDC projects—Xiluodu to Guangdong and Nuozhadu to Guangdong—will be fully operational. These green energy initiatives, which transmit clean hydropower from western regions to the east, are made possible through continuous innovation and the application of advanced technologies. The research and application of high-voltage ±800 kV UHVDC external insulation properties by the China Southern Power Grid Science Institute has played a crucial role in the world’s first UHVDC transmission project. The technology was later widely adopted in subsequent projects and earned the 2012 National Energy Technology Progress Award. One of the most notable breakthroughs in this field was the Yunguang UHVDC project. A few years ago, there was little public awareness about UHV construction, and even the concept of 800 kV systems was unfamiliar. As the first UHVDC transmission line in the world, the Yunguang project had no prior examples to follow. Spanning from Chuxiong in Yunnan Province to Guangzhou in Guangdong, the Yunguang-Guangdong UHVDC line crosses mountainous regions and passes through a plateau at around 2,000 meters above sea level. The insulation challenges at such high altitudes were critical to the project’s success and safety. The Chuxiong Converter Station, located on the Yunnan-Guizhou Plateau at 1,850 meters, is the second-highest converter station globally. To address the impact of thin air on insulation, China Southern Power Grid developed the world’s first ±800 kV UHVDC composite insulator. This achievement came from collaborative research with the South China Research Institute and Tsinghua University. Unlike foreign technologies that relied on low-altitude testing, this project used the UHV Engineering Technology (Kunming) National Engineering Laboratory at 2,100 meters to study elevation correction for external insulation. Over five years, the team developed a comprehensive solution for designing external insulation in high-altitude UHVDC projects, setting a new standard in the industry.

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