Influence of Excitation by Idling Rotor on Wind Turbine Ultimate Loads in Storm Conditions

Shigeo Yoshida () and M. Fekry
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Shigeo Yoshida: Institute of Ocean Energy, Saga University, 1 Honjomachi, Saga 840-8502, Japan
M. Fekry: Institute of Ocean Energy, Saga University, 1 Honjomachi, Saga 840-8502, Japan

Energies, 2024, vol. 17, issue 5, 1-15

Abstract: Typical large scale pitch-controlled wind turbines idle their rotors during storm conditions. The design loads of wind turbines are calculated by aeroelastic simulations under various conditions. These include grid loss and failures, which can increase rotor speed and excite the first-mode of the tower bending. In this study, the influences of self-excitation by the idling rotor on the ultimate loads in storm conditions were investigated. Aeroelastic simulations were conducted for a three-bladed 5 MW upwind turbine as an example, under steady and extreme turbulent wind conditions according to the international design standard IEC61400-1 ed.4. As a result, we confirmed that yaw misalignment increases the idling rotor speed and 6P, second order harmonics of blade passing frequency, excites the first-mode tower bending, which can generate a large load on the tower. Pitch stick can increase the rotor speed but not as noticeably as yaw error. Although no clear provisions exist in wind turbine design standards or guidelines for the self-excited vibration during wind turbine idling, these results indicate that conditions must be set that consider self-excited vibration.

Keywords: load calculation; design load case; self-excitation; resonance; idling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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