On the Potential of Pitch Control for Increased Power Capture and Load Alleviation

Knud Abildgaard Kragh, Lars Christian Henriksen, Morten Hartvig Hansen

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    Abstract

    Wind turbine control is a research area that is gaining increasing interest, and numerous simple and advanced control schemes have been suggested, especially for load alleviation. The performance of such controllers is often compared to the performance of simpler controllers, thus relative to a moving reference. This study is focused on estimating the upper limits of the power increase and load variation alleviation that are achievable through pitch actuation. Knowing these upper limits, the potential of improving existing controllers can be assessed. The achievable power output increase and load variation reduction are estimated through numerical optimization of the pitch and generator torque actuation. Results show that the potential of increased power output at below rated wind speeds through optimized pitch actuation is greatest for inflows that varies with the azimuthal position of the blades. It is shown that at above rated wind speeds, the potential of decreasing the wind shear induced load
    variations beyond what is possible with a simple cyclic pitch scheme is limited. The results presented in this study are all obtained from simulations with deterministic inflow because the absolute upper limits are sought, and turbulent inflow is assumed to decrease these limits.
    Original languageEnglish
    Title of host publicationProceedings of Torque 2012, the science of making torque from wind
    Number of pages10
    Publication date2012
    Publication statusPublished - 2012
    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

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