Mitigating the Long term Operating Extreme Load through Active Control

Christina Koukoura, Anand Natarajan

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    Abstract

    The parameters influencing the long term extreme operating design loads are identified through the implementation of a Design of Experiment (DOE) method. A function between the identified critical factors and the ultimate out-of-plane loads on the blade is determined. Variations in the initial blade azimuth location are shown to affect the extreme blade load magnitude during operation in normal turbulence wind input. The simultaneously controlled operation of generator torque variation and pitch variation at low blade pitch angles is detected to be responsible for very high loads acting on the blades. Through gain scheduling of the controller (modifications of the proportional Kp and the integral Ki gains) the extreme loads are mitigated, ensuring minimum instantaneous variations in the power production for operation above rated wind speed. The response of the blade load is examined for different values of the integral gain as resulting in rotor speed error and the rate of change of rotor speed. Based on the results a new load case for the simulation of extreme loads during normal operation is also presented.
    Original languageEnglish
    Article number012076
    Book seriesJournal of Physics: Conference Series (Online)
    Volume555
    Number of pages9
    ISSN1742-6596
    DOIs
    Publication statusPublished - 2014
    EventThe science of Making Torque from Wind 2012: 4th scientific conference - Universität Oldenburg, Oldenburg, Germany
    Duration: 9 Oct 201211 Oct 2012
    http://www.forwind.de/makingtorque/Home.html

    Conference

    ConferenceThe science of Making Torque from Wind 2012
    LocationUniversität Oldenburg
    Country/TerritoryGermany
    CityOldenburg
    Period09/10/201211/10/2012
    Internet address

    Bibliographical note

    Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd

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