Contra-rotating marine current turbines: single point tethered floating system - stabilty and performance

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The Energy Systems Research Unit within the Department of Mechanical Engineering at the University of Strathclyde has developed a novel contra-rotating tidal turbine (CoRMaT). A series of tank and sea tests have led to the development and deployment of a small stand-alone next generation tidal turbine. Novel aspects of this turbine include its single point compliant mooring system, direct drive open to sea permanent magnet generator, and two contra-rotating sets of rotor blades. The sea testing of the turbine off the west coast of Scotland in the Sound of Islay is described; the resulting stability of a single-point tethered device and power quality from the direct drive generator is reported and evaluated. It is noted that reasonably good moored turbine stability within a real tidal stream can be achieved with careful design; however even quite small instabilities have an effect on the output electrical power quality. Finally, the power take-off and delivery options for a 250kW production prototype are described and assessed.
Original languageEnglish
Number of pages11
Publication statusPublished - 7 Sep 2009
Event8th European Wave and Tidal Energy Conference, EWTEC 2009 - Uppsala, Sweden
Duration: 7 Sep 200910 Sep 2009


Conference8th European Wave and Tidal Energy Conference, EWTEC 2009
CityUppsala, Sweden


  • contra-rotating
  • stability
  • tidal
  • turbine
  • marine
  • current turbines
  • single point
  • tethered
  • floating system
  • performance

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