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Analysis of a single point tensioned mooring system for station keeping of a contra-rotating marine current turbine

Analysis of a single point tensioned mooring system for station keeping of a contra-rotating marine current turbine

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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). Novel aspects of this turbine include two contra-rotating sets of rotor blades directly driving an open-to-sea permanent magnet generator (PMG). The balancing of reactive forces by the use of contra-rotation enables the use of a single-point compliant mooring system for station keeping. A series of tank and sea tests have led to the deployment and demonstration of a small stand-alone next generation tidal turbine. The stability of a single-point mooring system is examined and power quality from the direct drive generator is evaluated. It is noted that good stability from a single-point mooring can be achieved within a real tidal stream; however from sea testing of the turbine off the west coast of Scotland in the Sound of Islay, it is shown that some instabilities in device station keeping may have an effect on the output electrical power quality. Finally, the scaling up of the power take-off and delivery options for a 250 kW production prototype are described and assessed. It was concluded that the most promising option was an enlarged version of the system already tested, namely a direct-drive contra-rotating PMG.

Inspec keywords: permanent magnet generators; turbines; power supply quality; tidal power stations; rotors

Other keywords: contra-rotating tidal turbine; single point tensioned mooring system; station keeping; power 250 kW; power quality; contra-rotating marine current turbine; permanent magnet generator; rotor blades; power take-off

Subjects: Tidal power stations and plants; Power supply quality and harmonics; d.c. machines; a.c. machines

References

    1. 1)
      • J. Ribrant , L.M. Bertling . Survey of failures in wind power systems with focus on Swedish wind power plants during 1997–2005. IEEE Trans. Energy Convers. , 1 , 167 - 173
    2. 2)
      • Nielsen, F.G., Hanson, T.D., Skaare, B.: `Integrated dynamic analysis of floating offshore wind turbines', Proc. of OMAE2006 25th Int. Conf. on Offshore Mechanics and Arctic Engineering, 4–9 June 2006, Hamburg, Germany, [CD-ROM], Houston, TX: The American Society of Mechanical Engineers (ASME International) Ocean, Offshore and Arctic Engineering (OOAE) Division, June 2006, OMAE2006–92291.
    3. 3)
      • Nilsson, K., Segergren, E., Sundberg, J., Sjostedt, E., Leijon, M.: `Converting kinetic energy in small watercourses using direct drive generators', Proc. of OMAE04 23rd Int. Conf. on Offshore Mechanics and Arctic Engineering (2004), 2004, Vancouver, BC, Canada.
    4. 4)
      • Wayman, E., Sclavounos, P.D., Butterfield, S., Jonkman, J., Musial, W.: `Coupled dynamic modeling of floating wind turbine systems', Offshore Technology Conf., 2006, Houston.
    5. 5)
      • L. Johanning , G.H. Smith , J. Wolfram . Mooring design approach for wave energy converters. J. Eng. Marit. Environ. , 4 , 159 - 174
    6. 6)
      • Johanning, L., Smith, G.H.: `Station keeping study for WEC devices including compliant chain, compliant hybrid and taut arrangement', Twenty-seventh Int. Conf. on Offshore Mechanics and Arctic Engineering, 15–20 June 2008, Estoril, Portugal.
    7. 7)
      • Alstom Power Ltd, WUMTUA, and LOG+1 Ltd for the DTI: ‘Economic viability of a simple tidal stream energy capture device’. URN Number: 07/575, 2007.
    8. 8)
      • UK DTI: ‘Marine renewables wave and tidal-stream energy demonstration scheme’. May 2005, www.dti.gov.uk/files/file23963.pdf 2005.
    9. 9)
      • Fitzgerald, J., Bergdahl, L.: `Considering mooring cables for offshore wave energy converters', Seventh European Wave and Tidal Energy Conf., 11–13 September 2007, Porto, Portugal.
    10. 10)
      • J.A. Clarke , G. Connor , A.D. Grant , C.M. Johnstone . Design and testing of a contra-rotating tidal current turbine. IMechE J. Power Energy Spec. Ed. Tidal Energy , 171 - 180
    11. 11)
      • Cotrell, J.A.: `Preliminary evaluation of a multiple-generator drivetrain configuration for wind turbines', Twenty-first American Society of Mechanical Engineers (ASME) Wind Energy Symp., January 2002, Reno, NV.
    12. 12)
      • W.M.J. Batten , A.S. Bahaj , A.F. Molland , J.R. Chaplin . Power and thrust measurements of marine current turbines under various hydrodynamic flow conditions in a cavitation tunnel and towing tank. Renew. Energy , 3 , 407 - 426
    13. 13)
      • Fonseca, N., Pascoal, R., Morais, T., Dias, R.: `Design of a mooring system with synthetic ropes for FLOW wave energy converter', Twenty-eighth Int. Conf. on Ocean, Offshore and Arctic Engineering, 31 May–5 June 2009, Honolulu, HI, USA.
    14. 14)
      • Johanning, L., Wolfram, J.: `Challenging tasks on moorings for floating WECs', Int. Symp. on Fluid Machinery for Wave and Tidal Energy: State of the Art and New Developments, 19 October 2005, London, UK.
    15. 15)
      • Clarke, J.A., Connor, G., Grant, A.D., Johnstone, C.M., Mackenzie, D.: `Design and initial testing of a contra-rotating tidal current turbine', Proc. of the World Renewable Energy Congress 2006, 2006, Florence, Italy.
    16. 16)
      • G. Bir , J. Jonkman . Aeroelastic instabilities of large offshore and onshore wind turbines. J. Phys.: Conf. Ser. , 69 - 76
    17. 17)
      • Harris, R.E., Johanning, L., Wolfram, J.: `Mooring systems for wave energy converters: a review of design issues and choices', Proc. of World Renewable Energy Congress VII, 2004, Denver, USA.
    18. 18)
      • Jonkman, J.M., Buhl, M.L.: `Loads analysis of a floating offshore wind turbine using fully coupled simulation', Windpower Conf. and Exhibition, June 2007.
    19. 19)
      • Clarke, J., Connor, G., Grant, A., Johnstone, C.: `Development and in sea performance testing of a single point mooring supported contra-rotating tidal turbine', Twenty-eighth Int. Conf. on Ocean, Offshore and Arctic Engineering, 31 May–5 June 2009, Honolulu, HI, USA.
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