Dynamic Analysis of a Floating Vertical Axis Wind Turbine Under Emergency Shutdown Using Hydrodynamic Brake

K. Wang, Martin Otto Laver Hansen, T. Moan

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    Abstract

    Emergency shutdown is always a challenge for an operating vertical axis wind turbine. A 5-MW vertical axis wind turbine with a Darrieus rotor mounted on a semi-submersible support structure was examined in this study. Coupled non-linear aero-hydro-servo-elastic simulations of the floating vertical axis wind turbine were carried out for emergency shutdown cases over a range of environmental conditions based on correlated wind and wave data. When generator failure happens, a brake should be applied to stop the acceleration of the rotor to prevent the rotor from overspeeding and subsequent disaster. In addition to the traditional mechanical brake, a novel hydrodynamic brake was presented to apply to the shutdown case. The effects of the hydrodynamic brake on the platform motions and structural loads under normal operating conditions and during the emergency shutdown events were evaluated. The use of both the hydrodynamic brake and mechanical brake was also investigated. The application of the hydrodynamic brake is expected to be efficient for rotor shutdown and for reducing the platform motions and structural loads.
    Original languageEnglish
    JournalEnergy Procedia
    Volume53
    Pages (from-to)56-69
    Number of pages14
    ISSN1876-6102
    DOIs
    Publication statusPublished - 2014
    EventEERA DeepWind 2014 - 11th Deep Sea Offshore Wind R&D Conference - Radisson Blu Royal Garden Hotel, Trondheim, Norway
    Duration: 22 Jan 201424 Jan 2014
    Conference number: 11
    http://www.sintef.no/Projectweb/Deepwind_2014/

    Conference

    ConferenceEERA DeepWind 2014 - 11th Deep Sea Offshore Wind R&D Conference
    Number11
    LocationRadisson Blu Royal Garden Hotel
    Country/TerritoryNorway
    CityTrondheim
    Period22/01/201424/01/2014
    Internet address

    Keywords

    • Emergency shutdown
    • Floating vertical axis wind turbine
    • Platform motion
    • Hydrodynamic brake

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