Siemens completed further offshore grid connection

Wednesday, 29 April, 2015 - 10:15
With a capacity of 864 MW SylWin alpha is actually the world’s most powerful offshore converter station. (Photo: Siemens)
With a capacity of 864 MW SylWin alpha is actually the world’s most powerful offshore converter station. (Photo: Siemens)

Siemens has handed over SylWin1, the third North Sea grid connection this year, to its customer TenneT. With a capacity of 864 MW SylWin1 is the world’s most powerful offshore grid connection.

The German-Dutch transmission grid operator TenneT has put the world's most powerful grid connection to date into commercial operation. The offshore platform SylWin alpha is located around 70 km west of the island of Sylt, after which the project was named. The electricity generated by wind power is transmitted over a more than 200 km subsea and underground cable link to the land-based station Büttel. SylWin1 has a record capacity of 864 MW.

"This year we have completed three offshore grid connections with efficient direct-current technology – SylWin1, BorWin2 and HelWin1. We also intend to put the fourth project HelWin2 into commercial operation as planned in the coming weeks", said Jan Mrosik, CEO of the Siemens Energy Management Division. "2015 is a special milestone year for TenneT", emphasized Lex Hartman, member of the managing board of TenneT TSO GmbH, "as we will be completing further offshore grid connections by the end of the year, meaning that all in all we will have implemented a capacity of more than 5,000 MW, or more than two-thirds of the offshore expansion goal set by the Federal German Government by then." The government's offshore expansion goal aims at implementing 6,500 MW by 2020.

The three offshore wind farms DanTysk, Butendiek and Sandbank, each with a capacity of 288 MW, are linked to SylWin1. DanTysk and Butendiek both consist of 80 Siemens wind turbines, each rated at 3.6 MW. Sandbank will be realized with 72 Siemens wind turbines in the 4-MW class. At present, more than 100 wind turbines are already linked to the grid connection. Under optimal wind conditions, such as those which the low-pressure storm front Niklas brought with it recently, a capacity of 350 MW was already transmitted via the SylWin1 grid link.

Transmission system operator TenneT contracted the consortium comprising Siemens and the Italian cable specialist Prysmian for the HelWin1 offshore grid connection early in 2011. The offshore platform was built by Nordic Yards in Germany.

Katharina Garus

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