China has completed its first deep-sea floating wind power platform for imminent operation, which has an installed capacity of 7.25 megawatts with an average annual power generation capacity forecast at 22 million kwh, the China National Offshore Oil Corporation (CNOOC), said on Saturday.
According to the CNOOC, submarine cables with a total length of five kilometers have been laid out to connect "CNOOC Guanlan" with Wenchang oilfields, which are located about 130 kilometers east of Wenchang City of Hainan Province. This signifies China's completion in building its first deep-sea floating wind power platform, which has met conditions for grid-connected power transmission.
The submarine cables of "CNOOC Guanlan" are designed for a water depth of 120 meters, including three 35 kV cables and three 12-core optical fibers.
One end of the cables are fixed on CNOOC Guanlan, and the other to the offshore oil and gas platforms of the Wenchang oilfields to transmit the green power produced by the wind power platform.
Unlike land cables, the submarine cables need to be adaptable to harsh marine environmental factors such as strong corrosion and seabed reefs.
"In construction, we adopted high-precision dynamic ship positioning technology and construction and monitoring by underwater robot throughout the process, which improved installation accuracy. By setting different buoyancy blocks, we can ensure that the dynamic submarine cable can resist the combined influence of tricky swell currents in deep and open seas," said Guo Shiran, an engineer with "CNOOC Guanlan".
After it is put into operation, the average annual power generation capacity is equivalent to the electricity demand of about 30,000 people per year, according to the engineer.
Source: CCTV
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