The World's First Five-Terminal Flexible DC Transmission Project is Undergoing a Complete Overhaul
May 23 2024 - 8:42PM
Business Wire
On May 17, in Zhoushan, Zhejiang Province, the world's first
five-terminal flexible DC transmission project, Zhoushan
five-terminal VSC-HVDC transmission project, is undergoing a
complete overhaul for the first time after it was put into
operation. Aeroamphibious intelligent equipment and advanced
technology are used in this overhaul, in order to greatly enhance
working efficiency by decreasing the overhaul duration in the
converter station to 9 days, which took 15 days in the past.
It is reported that the overhaul is the largest after 10 years’
running. For example, in the Zhoudai converter station, the hub of
5 converter stations, the staff need to conduct an overall test on
electrical equipment, like sub-modules, water cooling systems, wall
bushings, and transformers, involving 8 working surfaces and over
210 items of inspection test in total.
Black technologies used by State Grid Zhoushan Power Supply
Company help improve the quality and efficiency of this overhaul,
such as the X-ray inspection device to check the integrity of the
water electrode inside the water cooling system on the valve tower,
the intelligent inspection UAV to check and accept the maintenance
of the equipment in the high place of the valve hall, and the
underwater robot to check the wear condition of the submarine cable
in the intertidal zone and diagnose the health of the protective
insulation layer outside the submarine cable.
Upon completion of the overhaul, the power supply reliability of
the island grid in the north of Zhoushan will be significantly
improved. At the same time, it will also provide an overhaul
demonstration for other multi-terminal flexible DC projects in
China.
Zhoushan five-terminal VSC-HVDC transmission project is the
world's first five-terminal flexible DC transmission project, as
well as the flexible DC transmission project with the most
terminals in the world.
The project was put into operation in 2014, including 5
converter stations called Zhouding, Zhoudai, Zhouqu, Zhouyang and
Zhousi, with a DC interconnection network set up among the islands
of Zhoushan through 283km DC submarine cables, realizing DC
interconnection and energy interconnection among the power grids of
several islands in the north of Zhoushan.
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Company Name: ZHEJIANG ELECTRIC POWER CORPORATION Contact
Person: xiaomai.li Email: fuyuqing@zs.zj.sgcc.com.cn State: Zhou
Shan Country: CHINA Website: www.zj.sgcc.com.cn