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OffshOre Anzeige #2 HansaTec | The Magazine 90_275 26.05.2009 14:09 Uhr Seite 1 58 LIFTING POWER ...Every Load Under Control! www.hansatec.de ® + 100 ...RUD- lifting systems in special quality! Hansa Tec Hebe- und Zurrtechnik GmbH Henschelstraße 1 27721 Ritterhude Tel. +49 4292 81 33 30 Fax +49 4292 81 33 33 info@hansatec.de ® FuE Gesellschaft für die Nutzung regenerativer Energien The <strong>Wind</strong>s and Waves are always on the Side of the ablest Navigators. (Edward Gibbon, 1776) Our Abilities: • R&D-Projects • Production Planning and Quality Assurance • Production and Welding Technology • Surveying • Structural Analysis and 3D-Design • Electrical Installations und Test Facilities • Operations and Maintenance F&E Gesellschaft für die Nutzung regenerativer Energien mbH Barkhausenstraße 60, D-27568 Bremerhaven Phone: +49 471 30810-0, Fax: +49 471 30810-19 E-mail: info@technologiekontor-bremerhaven.de Internet: www.technologiekontor-bremerhaven.de Leading risk and insurance solutions for offshore wind farms – worldwide. www.nw-assekuranz.de
new power grid for Offshore power Transpower stromübertragungs gmbh (former e.On netz) is providing the power link from the first wind farms in the north Sea to the mainland grid. a legal framework for this task was set by the infrastructure Planning acceleration act passed on 24 november 2006. Under this law, grid operators on the coast must see to linking wind farms off the coast, “power points at sea”, with the mainland. e.On and Vattenfall are responsible for this in grid linkage in germany’s north- and Baltic Sea area. Since 2007, Transpower has commissioned labour and construction worth more than 400 million euros to connect wind farms like alpha ventus and Bard Offshore 1 to the grid. MOnItOrIng and cOntrOl Safeguarding offshore power generation requires remote monitoring and control capability on land. BTC, an IT consultant firm located in Oldenburg and member of WAB, negotiated a contract with the alpha ventus project to create an integrated IT network for individual turbines manufactured by REpower and Multibrid; this also covers process monitoring and control from a control room, and integrates technical management as well, whether for planning, administration or the documentation of maintenance done on wind turbines and transformer platforms. This system is entirely new in the market. Although individual turbines have software tailored especially for technical monitoring, a plan for the alpha ventus project which allowed overall manufacturer-independent control and management had to be set in place to optimise turbine management and ensure that power be reliably fed into the grid. OffshOre #2 | The Magazine The grid link for alpha ventus was completed early in 2009 (through a 110-kilovolt three-phase link). The power line from the wind farm to the feed-in point at the new hagermarsch transformer station (near the city of aurich) is about 70 kilometres long. it runs via the island norderney and the Wadden Sea national Park of Lower Saxony. Strict conservation regulations were imposed during construction to ensure there was no threat to plants and animals in the reserve. The offshore transformer station, where power from 12 wind turbines is collected, has been in place since September 2008. To reduce conduction losses, a 200-kilometre high-voltage DC transmission line was built from the 400 MW Bard Offshore 1 wind farm – a world premiere. alternating current is converted to direct current at the wind farm’s transformer platform and then converted back to alternating current on land. The entire transmission system has been designed to link several wind farms. 59
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