In the waters off the Yangjiang River in the South China Sea, 70 kilometers offshore, giant wind turbines stand tall in deep blue. After months of offshore construction work, the construction team withstood the test of typhoons, high salt spray, and complex sea conditions, completed equipment installation, submarine cable laying, and system debugging, and ushered in the first batch of unit grid connection time for this offshore wind power project that broke multiple world records, accumulating valuable practical experience for the development of deep and offshore energy in China.

Breaking multiple world records

The project is located in the southern sea area of Yangxi County, Yangjiang City, Guangdong Province, with 163 wind turbines installed and a total installed capacity of 2 million kilowatts. The center of the site is about 70 kilometers offshore and the water depth exceeds 50 meters. The project adopts a flexible DC transmission scheme of ± 500 kV and 2 million kW. The electrical energy is collected through submarine cables to the offshore converter station for boosting and rectification, and then transmitted to the land through high-voltage submarine cables. The project has won four world records and for the first time applied ± 500 kV DC submarine cables to offshore wind power, overcoming the bottleneck of long-distance transmission batteries in the deep sea.

Domestic upgrade of core equipment

The project significantly improves the localization level of key offshore equipment such as basic steel structure wind turbines, submarine cables, and electrical equipment, continuously improves the independent and controllable industrial chain of offshore wind power, and promotes the improvement of domestic offshore equipment research and development manufacturing capabilities. Since the completion of the wind turbine installation in early August, the engineering team has been continuously responding to the harsh marine environment in the South China Sea, carrying out unit commissioning, submarine cable laying system integration and grid connection tests in an orderly manner to ensure the smooth grid connection of the units. Keywords: Deep sea wind power, flexible DC, offshore converter station

Green electricity helps reduce carbon emissions in the Bay Area

After the project is fully put into operation, it will annually deliver approximately 6 billion kilowatt hours of clean electricity to the Guangdong Hong Kong Macao Greater Bay Area, reducing carbon dioxide emissions by nearly 5 million tons. The project team will continue to promote the grid connection of the remaining units and steadily advance the full capacity production. The landing of the project marks a key progress in the large-scale development of offshore wind power in China, providing replicable technical solutions for similar offshore wind power projects in the country.Editor/Min Jing