Group 1 - The Zang-Guangdong DC project is the world's strongest and most advanced flexible DC transmission project, with a total investment of 53.2 billion yuan [1] - The project will span approximately 2,681 kilometers, crossing Tibet, Yunnan, Guangxi, and Guangdong, and will utilize domestically developed ultra-high voltage flexible DC transmission technology with a rated voltage of ±800 kV and a capacity of 10 million kW [1] - The project aims to deliver clean energy from Tibet to Guangdong, addressing challenges related to high altitude, long distance, and large capacity transmission [1][2] Group 2 - The Zang-Guangdong DC project is expected to be fully operational by 2029, capable of transmitting over 43 billion kWh of electricity annually to the Guangdong-Hong Kong-Macao Greater Bay Area, which is about half of the annual output of the Three Gorges Dam [2] - The project will tackle technical challenges in weak grid areas and high-altitude regions, promoting innovation in the entire ultra-high voltage flexible DC transmission industry chain [2] - Companies involved in the industry chain, including XJ Electric and Guangzhou Baiyun Electric, are focusing on technological breakthroughs and enhancing their product offerings in flexible DC transmission [3]

Core Insights - The Kunliulong Direct Current Project, the world's first ±800 kV ultra-high voltage flexible direct current transmission project, marks a significant milestone in China's power industry, having operated safely for five years and demonstrating advanced technology in global power transmission [1][7] Group 1: Project Achievements - Over the past five years, the Kunliulong project has delivered more than 113.5 billion kilowatt-hours of clean electricity, equivalent to a reduction of 87 million tons of CO2 emissions, contributing significantly to low-carbon development [1] - The project has achieved 19 world-firsts, showcasing its scale, reliability, and technological maturity, and providing critical technical support for large-scale renewable energy transmission [1][7] Group 2: Technological Innovations - The flexible direct current converter, described as the "heart" of the project, utilizes over 5,000 IGBT modules that operate with high precision, adjusting every 100 microseconds, thus overcoming a major challenge in the global power industry [2] - The control and protection system, referred to as the "super brain," can manage 17,000 control objects with ultra-fast, high-precision coordination, achieving a control response time of under 150 microseconds, setting a new global record [3] - A hybrid topology structure was developed to address lightning strike issues, allowing for rapid fault clearance and restoration of power supply within 0.5 seconds, significantly enhancing grid reliability [4][5] Group 3: Emergency Response and Stability - The flexible direct current technology features an "emergency rescue" capability, enabling quick transitions to support modes during grid faults, thus providing voltage support and ensuring grid safety [6] - The technology has proven to stabilize the integration of renewable energy sources like wind and solar power, addressing challenges in connecting these variable power sources to the grid [6] Group 4: Recognition and Future Prospects - The Kunliulong project has received multiple accolades, including being named one of the "Top Ten Super Projects" by state-owned enterprises and winning the "National Quality Engineering Gold Award" [7] - The project exemplifies China's leadership in high-end power equipment and is seen as a significant contribution to global sustainable energy development, with ongoing advancements supporting the construction of a new energy system and achieving carbon neutrality goals [7]