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Prysmian completes DolWin3 work

By: Tom Russell 13/11/2019 Prysmian Group

Cables Converters General

Prysmian Group has completed its work on the High Voltage Direct Current (HVDC) DolWin3 offshore grid connection project located off the German North Sea coast. Prysmian secured the project in February 2013, with a contract awarded by Alstom Grid (now GE Grid GmbH) on behalf of the Dutch-German grid operator TenneT.

Prysmian was responsible for the supply, installation and commissioning of the HVDC ± 320 kV extruded submarine and land power cable connections with a rating of 900 MW and the associated fibre optic cable system, covering a 78 km land route and an 83 km subsea route. The cables were produced at the Prysmian Group's and manufacturing facilities in Arco Felice (Italy), Pikkala (Finland) and Delft (The Netherlands).

“We are very proud of having contributed to the development of such an important renewable energy project proving our ability to provide tailor-made submarine cable solutions to support the growth of clean energy in Northern Europe," stated Hakan Ozmen, EVP Projects, Prysmian Group.

DolWin3 is the third grid connection of the DolWin wind farm cluster, located in the south western region of the North Sea. This offshore grid connection project will feed up to 900MW of wind energy generated offshore to the German grid.

Two wind farms in the south western part of the German North Sea connect onshore via the link, Merkur and Borkum Riffgrund 2. It will convert the three-phase Alternating Current (AC) generated by the wind farms to Direct Current (DC). It will then transport offshore wind energy ashore using over 80km of submarine cable and 80km of onshore cable to a converter station in Dörpen West, Lower Saxony. The electricity is then converted back into AC for integration into the German national grid.

The offshore platform is linked to another nearby converter, DolWin Alpha, allowing for wind energy to be routed through either of the platforms in the event of an output or cable failure. The connection uses a cable with a 800mm2 cross-section and has been designed to withstand the strong winds and rough wave conditions of the North Sea.

TenneT has been providing grid connections for offshore wind farms in the North Sea since 2006. These include BorWin1, the world's first and over 200-kilometer DC link between an offshore wind farm and the shore power grid, which has been in operation since 2015. In addition to the nine network connections already completed, TenneT will commission three additional offshore grid connections by the end of 2019, meaning that more than 7 GW of offshore wind energy from the North Sea will be available. The transmission system operator expects four more network connections to be online by 2025, providing a total of over 10 GW of transmission capacity.

For more information on offshore wind grid connection projects worldwide, click here. You can view cable routes for wind farms and offshore infrastructure using 4C Offshore's Interactive Map.

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Prysmian completes DolWin3 work

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