As of 10:03 on December 27, 2018, the annual utilization hours of the world's high voltage and large capacity flexible DC project built and operated by China Southern Power Grid Company - Yunnan Power Grid and China Southern Power Grid main network asynchronous networking project has reached 5,000 hours, creating the world's best operation record of similar projects. It shows that China's high-voltage flexible DC technology has a large-scale application basis, and has made positive contributions to improving the industrial chain level of China's smart grid and promoting the development of new smart grid technologies.