Siemens installs prototype of 7-megawatt offshore wind turbine

The SWT-7.0-154 model yields nearly 10% more power than its predecessor.

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Siemens (Munich, Germany) has installed a prototype of its offshore flagship wind turbine. The field testing of the 7- megawatt (MW) offshore machine in Østerild, Denmark focuses on the upgraded generator and the enhanced electrical system. The majority of other components are the same technology of the Siemens SWT-6.0-154, including the rotor with its diameter of 154 meters. This latest edition of the D7 product platform can produce 32 million kilowatt hours of clean electricity under offshore wind conditions, with enough energy to supply up to 7,000 households.

In May 2011, Siemens installed the first prototype of its direct drive offshore wind turbine. “The installation of the 7-MW version is an exciting step in its further development,” said Morten Rasmussen, head of technology at Siemens Wind Power and Renewables Division. “Based on the reliable technology and supply chain of our six megawatt machine, we have improved our flagship wind turbine with stronger permanent magnets, optimized generator segments and upgraded converter and transformer units. With only these minor changes, we expect to get it ready for serial production within only two years.” 

The gearless drive technology permits a compact design and using Siemens' Direct Drive technology, the SWT-7.0-154 is the lightest turbine of its class. The SWT-7.0-154 model yields nearly 10% more power than its predecessor at comparable operational costs.