The grid operator TenneT and Siemens have now initiated the trial run of the BorWin2 direct current grid connection. After several weeks of trial operation, the grid connection will be able to go into controlled operation in the first few months of 2015. With a transmission capacity of 800 MW, the BorWin2 grid connection can supply about 800,000 households with clean electricity.
Siemens installed the BorWin2 HVDC platform, located about 100 km northwest of the North Sea island of Borkum, during the summer. Prysmian, a consortium partner and cable expert, was responsible for the installation of two 200-km-long submarine cables. After successfully connecting the Global Tech 1 wind farm, the BorWin2 grid connection fed electricity into the grid for the first time in initial tests conducted in early September. Fifty percent of the grid connection’s capacity is planned for another wind farm. Since construction of the wind turbines has not yet begun, TenneT expects that the 800-MW grid connection will be used at only 50 percent capacity for the next two years.
Siemens will utilize HVDC technology, installed both on the offshore platform as well as in the land-based converter station in Diele, East Frisia, to efficiently bring the wind-generated electricity to land. The wind-generated power will first be transported as alternating current to the BorWin2 converter platform, converted there into direct current, and brought to land via submarine cables. The land-based station converts the direct current back into alternating current and feeds it into the high-voltage grid.
In all, Siemens is now implementing five North Sea grid connection projects for TenneT. Projects to date are: HelWin1 (576 MW) and HelWin2 (690 MW) off of Helgoland, BorWin2 (800 MW) off of Borkum and SylWin1 (864 MW) off of Sylt. Siemens received the contract for the BorWin3 link in the spring of 2014; the four other grid link projects are in the advanced stages of completion and will successively go into operation between 2014 and 2015.