|
Siemens hands over HelWin1,
the second
North Sea grid connection to TenneT
| • A further milestone in achieving
the Federal German Government's goals of expanding offshore wind
power |
| • Second direct-current grid
connection now in commercial operation |
| • Transmission capacity enough to
supply more than 700,000 households with power |
2015-02-09 + + + Siemens has now handed over HelWin1, the second
North Sea grid connection in quick succession, to its client TenneT. The
German-Dutch transmission system operator has now also put this grid
connection into commercial operation.
The offshore platform of the HelWin1
grid connection is located around 85 kilometers off the German coast –
northwest of the island of Helgoland, after which the project was named.
Up to 576 megawatts (MW) of clean electricity can now be transmitted with
this grid connection – enough to supply more than 700,000 German
households.
The Nordsee Ost and Meerwind Süd/Ost wind farms are linked to
HelWin1. At present, wind turbines with a total capacity of around 260 MW
are linked to the grid connection, with new turbines being connected
almost on a daily basis. The Meerwind Süd/Ost wind farm is made up of 80
Siemens 3.6 megawatt wind turbines.
"This year we have
completed the world's first two large-category offshore grid connections
equipped with efficient direct-current technology. We also intend to put
the next two projects into commercial operation as planned within a few
months," stated Jan Mrosik, CEO of the Siemens Energy Management Division.
"With the completion of HelWin1, TenneT now provides around 2,000 MW of
transmission capacity in the German North Sea," explained Lex Hartman,
Member of the Board at TenneT TSO GmbH. TenneT is therefore in good time
fulfilling nearly one third of the expansion targets of the German Federal
Government of 6,500 MW by 2020.
Transmission system
operator TenneT contracted the consortium consisting of Siemens and the
Italian cable specialist Prysmian for the HelWin1 offshore grid connection
in summer 2010. Siemens is now implementing five North Sea grid connection
projects for TenneT: HelWin1 (576 MW) and HelWin2 (690 MW) off of
Helgoland, BorWin2 (800 MW) and BorWin3 (900 MW) off of Borkum and SylWin1
(864 MW) off of Sylt. Two of these, BorWin2 and HelWin1, have already
taken up normal operation.
The next two grid
connections, Sylwin1 and HelWin2, are scheduled to take up commercial
operation in the first half of 2015 as well. Siemens received its latest
order for a grid connection in the North Sea, BorWin3, in a consortium
with Petrofac in the spring of 2014. Commissioning of this fifth grid
connection from Siemens is scheduled for 2019. The grid connections
implemented by Siemens for TenneT will have a total transmission capacity
of theoretically more than 3.8 gigawatts (GW), providing electricity from
offshore wind power to supply around five million households.
Thanks to the Siemens high-voltage
direct-current (HVDC) technology, transmission losses for each grid
connection, including cable losses, are less than four percent. This
Siemens HVDC technology is installed on the offshore platforms and in the
land-based converter stations. The wind-based electricity is transmitted
as alternating current to the converter platform, transformed into direct
current and fed to the mainland via a subsea cable. The land-based station
converts the direct current back into alternating current and feeds the
electricity into the extra-high voltage grid. HVDC is the only efficient
transmission solution for cable lengths of more than 80 kilometers.
The HVDC Plus technology used by Siemens is
less complex and extremely compact, making it predestined for use in
sea-based applications. In contrast to classic HVDC technology used in a
vast majority of land links, systems equipped with HVDC Plus feature
self-stabilization. As fluctuations in the grid must always be reckoned
with for wind-based power generation, grid stability and reliability is
enhanced considerably through the use of the Siemens HVDC Plus technology.
More information about the Energy Management
Division is available at
www.siemens.com/energy-management
Source: Sabrina Martin, Stephan Heimbach,
Siemens AG
www.siemens.com
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