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Cahay M.,Technip | Luquiau E.,Technip | Smadja C.,Nenuphar | Silvert F.,Nenuphar
Offshore Technology Conference, Proceedings | Year: 2011

The use of a vertical axis wind turbine that offers a much lower center of gravity than the more standard horizontal axis wind turbine concepts is studied. Combined to an effective mooring system, this new floating wind turbine can economically compete with bottom mounted solutions in shallow water, considering that integration of the turbine in the floater and installation of the floating wind turbine must remain as simple and as safe as possible. The selection of the vertical axis turbine architecture, reducing the number of mechanical parts (gear box, yaw and pitch control), significantly improves the simplicity and the robustness of the wind turbine leading a to significant reduction of maintenance costs throughout the total life time of the unit. The test results of a vertical axis wind turbine onshore prototype which has been running for several months are presented as well as the development plan for a 2 Mw onshore prototype and a full scale 2 Mw floating prototype to be installed in France in 2012. This is an abstract of a paper presented at the Offshore Technology Conference 2011 (Houston, TX 5/2-5/2011).

Cahay M.,Nenuphar | Luquiau E.,Nenuphar | Smadja C.,Nenuphar | Silvert F.,Nenuphar
JPT, Journal of Petroleum Technology | Year: 2011

With 2.0 GW already installed and more than 50.0 GW planned in Europe by 2020, as reported by the European Wind-Energy Association, the installation of bottom-mounted offshore wind turbines in very shallow water (less than 40 m) is now well established. The foundation and the offshore installation costs represent approximately 50% of the total development cost of an offshore wind farm, and this proportion increases with the water depth. Hence, floating wind turbines are the solution for deep offshore.

A vertical axis wind turbine includes a substantially vertical, central mast; one or more blades, each blade having an upper tip end and a lower tip end and including two or more connected blade segments, each defined by a longitudinal axis and a transverse airfoil cross section, wherein the ends of adjacent blade segments are connected together by means of a connection arrangement provided between the adjacent blade segments; and at least one support arm extending outwardly from the central mast, wherein the peripheral end of each support arm is connected to one of the blades through the connection arrangement of that blade. Each blade extends around the central mast such that the upper and lower tip ends are angularly displaced from each other about the central mast.

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