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Siemens installs two offshore platforms for TenneT
in the North
Sea in July
• Two significant milestones for German
offshore grid expansion
• First four North Sea platforms from Siemens
will transmit wind-based electricity to supply around three million German
households
• Successive commissioning between 2nd half of 2014 and 1st
half of 2015
July 21 2014 + + + Siemens has installed a fourth
offshore platform in the North Sea, completing an important stage for grid
connections of sea-based wind farms. This is the platform for the SylWin1
DC link, which is the most powerful of the four offshore wind power grid
connections contracted to Siemens by the German-Dutch transmission grid
operator TenneT between 2010 and 2011.
 Only a few days prior to this,
Siemens installed the third
platform at sea for the HelWin2 grid
connection. In all, Siemens is implementing five North Sea grid connection
projects for TenneT. The first four grid connections, whose platforms have
now been installed at sea, are scheduled to take up commercial operation
successively between the second half of 2014 and the first half of 2015.
The fifth grid connection, which was contracted earlier this year, is
slated to go on-line in 2019.
"We have now erected four high-tech
platforms for TenneT in the North Sea. We succeeded in completing the
first installation last year and erected the other three platforms in
quick succession this year – an ambitious task as far as technology and
logistics go. Once they have been commissioned, these grid connections
will supply electricity from offshore wind power for around three million
households", stated Jan Mrosik, CEO of the Power Transmission and Smart
Grid Divisions of Siemens AG. "In the past few days, we have erected two
platforms in quick succession that will provide approximately 1.5
gigawatts of additional capacity for feeding offshore wind energy into the
onshore transmission grid. The German government has decided to increase
the transmission capacity for offshore wind energy by 6.5 gigawatts in the
period until 2020. In 2015, two-thirds of that target will already have
been achieved," said Wilfried Breuer, Offshore Director at TenneT Germany.
The newly installed SylWin1 platform with a capacity of 864 megawatts
(MW) and located 70 km to the west of the island Sylt, after which the
project was named, will concentrate the wind power produced by the three
North Sea wind farms Dan Tysk, Butendiek and Sandbank and transmit the
electricity to land. This platform, with dimensions of 83 x 56 x 26 meters
(length x width x height) is the largest converter platform installed to
date worldwide. With its baseframe, the platform has a total weight of
25,000 tons. Only a few days before this, Siemens also erected the HelWin2
platform (690 MW) 35 km north of the island of Helgoland. The HelWin1
platform (576 MW) was installed in August 2013 adjacently. The BorWin2
platform (800 MW) was installed by Siemens in April 2014 northwest of the
island of Borkum. These four grid connections will have a total
transmission capacity of more than 2.9 gigawatts (GW), with enough wind
power to supply around three million households. The fifth grid
connection, BorWin3 (900 MW), which was ordered this year, is scheduled to
supply wind power to a further 900,000 households starting in 2019.
Using the Siemens technology installed on the platforms, the
alternating current power generated by the wind turbines is transformed
into direct current for efficient transmission onto land. At the
associated land-based station the electricity from the linked wind farms
will be converted back into the alternating current power required for
feeding into the grid. Thanks to the low-loss high-voltage direct-current
(HVDC) technology used here, transmission losses are less than four
percent. The platforms are designed for decades of operation in the rugged
North Sea and are fully automated. The platforms for the SylWin1, HelWin1
and BorWin2 projects were manufactured by Nordic Yards under contract by
Siemens in the shipyards in Wismar and Warnemünde. The HelWin2 platform
was constructed by the Dutch company Heerema. Petrofac, a general
contractor active in the oil and gas industry, is responsible for the
design, manufacture, transport and installation of the BorWin3 platform.
The subsea and land-based cables for all of the projects were supplied by
the Italian cable specialist Prysmian.
HVDC solutions and the
associated service are part of the Siemens environmental portfolio. Around
43 percent of the company's revenues are provided by green products and
solutions. That makes Siemens one of the world’s leading providers of
eco-friendly technology.
Source: Torsten Wolf, Siemens AG,
www.siemens.com
Please see also:
Siemens succesfully installs third HVDC platform
in the
North Sea for Tennet
Please see also:
OVERDICK: SylWin alpha successfully installed
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