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Analysis of Wind-Turbine Main Bearing Loads Due to Constant Yaw Misalignments over a 20 Years Timespan

Author

Listed:
  • Martin Cardaun

    (Center for Wind Power Drives, RWTH Aachen University, 52062 Aachen, Germany)

  • Björn Roscher

    (Center for Wind Power Drives, RWTH Aachen University, 52062 Aachen, Germany)

  • Ralf Schelenz

    (Center for Wind Power Drives, RWTH Aachen University, 52062 Aachen, Germany)

  • Georg Jacobs

    (Center for Wind Power Drives, RWTH Aachen University, 52062 Aachen, Germany)

Abstract

The compact design of modern wind farms means that turbines are located in the wake over a certain amount of time. This leads to reduced power and increased loads on the turbine in the wake. Currently, research has been dedicated to reduce or avoid these effects. One approach is wake-steering, where a yaw misalignment is introduced in the upstream wind turbine. Due to the intentional misalignment of upstream turbines, their wake flow can be forced around the downstream turbines, thus increasing park energy output. Such a control scheme reduces the turbulence seen by the downstream turbine but introduces additional load variation to the turbine that is misaligned. Within the scope of this investigation, a generic multi body simulation model is simulated for various yaw misalignments. The time series of the calculated loads are combined with the wind speed distribution of a reference site over 20 years to investigate the effects of yaw misalignments on the turbines main bearing loads. It is shown that damage equivalent loads increase with yaw misalignment within the range considered. Especially the vertical in-plane force, bending and tilt moment acting on the main bearing are sensitive to yaw misalignments. Furthermore, it is found that the change of load due to yaw misalignments is not symmetrical. The results of this investigation are a primary step and can be further combined with distributions of yaw misalignments for a study regarding specific load distributions and load cycles.

Suggested Citation

  • Martin Cardaun & Björn Roscher & Ralf Schelenz & Georg Jacobs, 2019. "Analysis of Wind-Turbine Main Bearing Loads Due to Constant Yaw Misalignments over a 20 Years Timespan," Energies, MDPI, vol. 12(9), pages 1-11, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1768-:d:229820
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    References listed on IDEAS

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    1. Lee, Hakjin & Lee, Duck-Joo, 2019. "Wake impact on aerodynamic characteristics of horizontal axis wind turbine under yawed flow conditions," Renewable Energy, Elsevier, vol. 136(C), pages 383-392.
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    Cited by:

    1. Mehlan, Felix C. & Nejad, Amir R., 2023. "Rotor imbalance detection and diagnosis in floating wind turbines by means of drivetrain condition monitoring," Renewable Energy, Elsevier, vol. 212(C), pages 70-81.
    2. Stoyan Kanev & Edwin Bot & Jack Giles, 2020. "Wind Farm Loads under Wake Redirection Control," Energies, MDPI, vol. 13(16), pages 1-15, August.
    3. Wenting Chen & Hang Liu & Yonggang Lin & Wei Li & Yong Sun & Di Zhang, 2020. "LSTM-NN Yaw Control of Wind Turbines Based on Upstream Wind Information," Energies, MDPI, vol. 13(6), pages 1-23, March.

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