en.Wedoany.com Reported - On July 8, the offshore converter station of the (Guangdong) Yangjiang Sanshan Island Offshore Wind Power Flexible DC Transmission Project (referred to as the Sanshan Island Project), currently the world's highest voltage and largest capacity offshore flexible DC converter station, set sail, marking the completion of the land-based construction phase and the transition to offshore transportation and installation.
The Sanshan Island Project is China's first integrated land-sea flexible DC transmission project. The offshore converter station, the core hub of the project, departed from Nantong, Jiangsu on the evening of July 7, covering a total voyage of approximately 1,000 nautical miles, with an estimated transportation duration of 5 to 7 days. The offshore converter station of the Sanshan Island Project has a voltage rating of ±500 kV and a transmission capacity of 2,000 MW, making it the world's highest voltage and largest capacity offshore flexible DC converter station, integrating core conversion equipment, electrical systems, and auxiliary facilities.
China Southern Power Grid Guangdong Power Grid Company Sanshan Island Project Engineer Wan Pingping revealed that the Sanshan Island Project adopts a land-sea integrated DC transmission model with a land-based DC hub, meeting the transmission needs of large-scale offshore wind power development and effectively addressing technical challenges in long-distance, large-scale centralized transmission of offshore wind power.
The offshore converter station is a 7-story steel structure platform, measuring 85.5 meters in length, 82.5 meters in width, and 43 meters in height, approximately equivalent to a 15-story building, with each floor area close to that of a standard football field. The total weight is about 25,000 tons, equivalent to the weight of over 50 complete high-speed train sets.
To address climatic conditions such as high salinity, high humidity, and frequent typhoons at sea, the offshore converter station of the Sanshan Island Project adopts anti-corrosion technology and an integrated anti-seismic and anti-typhoon design framework, capable of withstanding Category 17 typhoons and magnitude 8 earthquakes. This offshore converter station can transmit 2,000 MW of offshore wind power from the Yangjiang sea area directly to the Greater Bay Area load center via 115 kilometers of submarine DC cables and 180 kilometers of land-based DC overhead lines.
"The Sanshan Island Project extends the reach of the Southern Power Grid's main network to deep-sea areas for the first time. Through this project, multi-terminal deep-sea wind power can be uniformly transmitted directly to the load center, improving the utilization efficiency of transmission corridors, saving land space resources, and achieving intensive use of transmission channels," said Luo Tao, General Manager of the Infrastructure Department of China Southern Power Grid Guangdong Power Grid Company.
