On July 1, 2022, State Grid Corporation of China Baihetan-Jiangsu ±800 kV UHV DC project (referred to as "Baihetan-Jiangsu Project") was completed and put into operation. It is understood that the completion and commissioning of the Baihetan-Jiangsu project is a specific action of the State Grid to implement the decisions and deployments of the Party Central Committee and the State Council, adding another energy artery across the country from east to west, which is crucial for optimizing energy allocation, ensuring power supply, stimulating economic growth, Promoting green development and leading technological innovation have significant comprehensive benefits and long-term strategic significance. It is reported that the Baihetan-Jiangsu project is a key project to ensure power supply during the peak season, a major project to stabilize economic growth and promote development, a green project to serve the "double carbon" goal, and a technologically independent electric ball valve innovation project.
After the Baihetan-Jiangsu project is completed, it can effectively guarantee the large-scale delivery of Baihetan Hydropower Station, promote the transformation of Sichuan's resource advantages into economic advantages, and help the economic rise of the western region. The project can add 4 billion to 6 billion kWh of surplus hydropower in Fengqi, Sichuan every year, greatly improving the efficiency of hydropower utilization. At the same time, the Baihetan-Jiangsu project is the second Sichuan Power into the Su-Su special high-voltage project after the Jinping-Sunan UHV project. The electric ball valve UHV DC line has a power transmission capacity of 8 million kilowatts, which can meet Jiangsu's economic Social development and people's electricity needs for a better life. The project cooperates with the existing UHV project in East China to increase the proportion of clean energy consumption in Jiangsu, enhance the power grid's ability to help each other with water and fire, help meet the peak summer and winter peaks, and effectively alleviate the mid-to-long-term contradiction between power supply and demand in East China.
The Baihetan-Jiangsu ±800 kV UHV DC project was completed and put into operation, which will also promote environmental protection and help the construction of a beautiful city. After the Baihetan-Jiangsu project is completed and put into operation, it will deliver over 30 billion kWh of clean electricity every year, which will help East China to reduce coal consumption for power generation by 14 million tons, carbon dioxide emissions by 25 million tons, sulfur dioxide by 250,000 tons, and nitrogen oxides by 220,000 tons. Significantly improve the environmental quality in East China, promote the green transformation of Jiangsu's energy, and win the battle to defend the blue sky.
For the first time in the world, the hybrid cascaded UHV DC transmission technology of "conventional DC + flexible DC" has been developed, integrating the advantages of large capacity, long distance, low loss of UHV DC transmission, flexible control of flexible DC transmission, and strong system support capabilities. Leading by example is of great significance. The electric ball valve UHV DC line project developed 20 new equipment such as controllable self-restoring energy dissipation devices, large-capacity single-column converters, and amplitude and phase correctors for the first time. Among them, the controllable self-restoring energy dissipation device can quickly achieve millisecond-level energy balance, greatly improving the power receiving capacity of the East China Power Grid. After the project is completed and put into operation, Yucheng Converter Station will become the first converter station in the world to adopt conventional DC and flexible DC mixed-level connection lines.