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HelWin2 grid connection © Siemens |
Siemens hands over
Transmission grid operator TenneT awarded the consortium consisting of Siemens and Italian cable specialist Prysmian the order to deliver the offshore grid links for HelWin1 (576 MW) and HelWin2 (690 MW) off Helgoland, BorWin2 (800 MW) off Borkum and SylWin1 (864 MW) off Sylt. All four North Sea grid links are now in normal operation and transporting electricity generated out at sea onto land with low losses. Siemens received its latest order for a grid connection in the North Sea, BorWin3, in the spring of 2014 in a consortium with Petrofac. This fifth Siemens grid link is due to go into commercial operation in 2019. After it is commissioned, the five installed Siemens network grids will have a total transmission capacity of 3.8 gigawatts and will transport offshore wind power for supplying theoretically nearly 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.
Source: Sabrina Martin, Stefan Wagner
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