Tower Based Load Measurements for Individual Pitch Control and Tower Damping of Wind Turbines

The Science of Making Torque from Wind

Kumar, A.A.^1 ; Hugues-Salas, O.^2 ; Savini, B.^2 ; Keogh, W.^2

DNV GL, 101 Apollo Drive, Auckland, New Zealand^1

DNV GL, One Linear Park, Avon Street, Temple Quay, Bristol

BS2 0PS, United Kingdom^2

关键词: Fatigue analysis;    Higher harmonics;    Individual pitch control;    Large wind turbines;    Load measurements;    Spectral characteristics;    Strain-gauge feedback;    Velocity feedback;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/5/052024/pdf
DOI  :  10.1088/1742-6596/753/5/052024

来源: IOP

【 摘 要 】

The cost of IPC has hindered adoption outside of Europe despite significant loading advantages for large wind turbines. In this work we presented a method for applying individual pitch control (including for higher-harmonics) using tower-top strain gauge feedback instead of blade-root strain gauge feedback. Tower-top strain gauges offer hardware savings of approximately 50% in addition to the possibility of easier access for maintenance and installation and requiring a less specialised skill-set than that required for applying strain gauges to composite blade roots. A further advantage is the possibility of using the same tower-top sensor array for tower damping control. This method is made possible by including a second order IPC loop in addition to the tower damping loop to reduce the typically dominating 3P content in tower-top load measurements. High-fidelity Bladed simulations show that the resulting turbine spectral characteristics from tower-top feedback IPC and from the combination of tower-top IPC and damping loops largely match those of blade-root feedback IPC and nacelle- velocity feedback damping. Lifetime weighted fatigue analysis shows that the methods allows load reductions within 2.5% of traditional methods.