World's Highest-Voltage and Largest-Capacity Offshore Wind VSC-HVDC Transmission Project Commissioned

en.Wedoany.com Reported - On September 27, the first five units of the Three Gorges Yangjiang Qingzhou Phase V and Phase VII offshore wind power project were successfully connected to the grid. As the world's highest-voltage and largest-capacity offshore wind flexible DC transmission project, its commissioning marks a key step forward in China's large-scale development of deep-sea offshore wind power.

The Three Gorges Yangjiang Qingzhou Phase V and Phase VII offshore wind power project is located in the sea area south of Yangxi County, Yangjiang City, Guangdong Province. It has 163 wind turbines installed, with a total installed capacity of 2 million kilowatts. The center of the project site is about 70 kilometers offshore, with water depths exceeding 50 meters and complex and changeable sea conditions. Faced with the challenges of long offshore distances and long transmission distances, the project adopts a ±500 kV/2 million kW flexible DC transmission scheme, in which the electricity generated by the wind turbines is collected via 66 kV submarine array cables into the "Heart of Sea Wind" offshore converter station for voltage boosting and rectification, and then transmitted directly to the onshore control center through ±500 kV submarine DC cables. Relying on this scheme, the project has achieved multiple "world firsts," including the world's largest offshore converter station system project, the world's first integrated offshore wind flexible DC transmission project, the world's highest-voltage and largest-capacity offshore wind flexible DC transmission project, and the world's first application of ±500 kV DC submarine cables, aiming to solve the technical challenges of long-distance transmission for deep-sea offshore wind power.

It is reported that the Three Gorges Yangjiang Qingzhou Phase V and Phase VII offshore wind power project has achieved a significant increase in the localization rate of core marine engineering equipment such as foundation steel structures, wind turbine units, submarine cables, and electrical equipment, pushing China's independent research and development and manufacturing capabilities for offshore wind power equipment to a new level and marking the steady construction of an independently controllable localization substitution system in this field.

"Since the completion of wind turbine installation in early August, the project team has overcome multiple challenges such as rough waves, severe salt spray corrosion, and frequent typhoons in the South China Sea, efficiently completing unit commissioning, submarine cable laying, system joint debugging, and grid-connection testing, and smoothly achieving grid-connected power generation of the first batch of units, laying a solid foundation for subsequent full-capacity grid connection," said Gu Pengcheng, an engineer of the Yangjiang Company of the Guangdong Branch of China Three Gorges Corporation.

After the project is fully operational, it can deliver approximately 6 billion kilowatt-hours of clean electricity to the Guangdong-Hong Kong-Macao Greater Bay Area each year, equivalent to reducing carbon dioxide emissions by nearly 5 million tons.