Vibration Reduction Strategy for Offshore Wind Turbines

The operational environment of offshore wind turbines is much more complex than that of onshore wind turbines. Facing the persistent wind and wave forces, offshore wind turbines are prone to vibration problems, which are not conducive to their long-term operation. Under this background, first, how t...

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Bibliographic Details
Published in:Applied sciences 2020-09, Vol.10 (17), p.6091
Main Authors: Liu, Haoming, Yang, Suxiang, Tian, Wei, Zhao, Min, Yuan, Xiaoling, Xu, Bofeng
Format: Article
Language:English
Subjects:
aerodynamic load
Aerodynamic loads
aerodynamic torque
Aerodynamics
Computer simulation
Control algorithms
Control theory
Controllers
Load
Methods
Offshore
Offshore drilling rigs
Offshore operations
Pitch (inclination)
pitch control
Simulation
Torque
Turbines
Vibration
Vibration analysis
Vibration control
vibration reduction
wave force
Wave forces
wind force
Wind power
Wind shear
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Summary:The operational environment of offshore wind turbines is much more complex than that of onshore wind turbines. Facing the persistent wind and wave forces, offshore wind turbines are prone to vibration problems, which are not conducive to their long-term operation. Under this background, first, how the wave affects the vibration characteristics of offshore wind turbines is analyzed. Based on the existing wave and wave load models, we analytically show that there exist fluctuating components related to the hydrodynamic frequency in the aerodynamic load and aerodynamic torque of offshore wind turbines. Simulation results based on a GH Bladed platform further validates the analysis. Second, in order to reduce the joint impacts of the wave, wind shear and tower shadow on the wind turbine, a variable pitch control method is proposed. The integrated tower top vibration acceleration signal is superimposed on the collective pitch reference signal, then the triple frequency (3P) fluctuating component of the wind turbine output power and the azimuth angle of each blade are converted into the pitch angle adjustment signal of each blade, which is superimposed on the collective pitch signal for individual pitch control. The simulation results show that the proposed pitch control strategy can effectively smooth the fluctuation of blade root flap-wise load caused by wind and wave, and significantly reduce the fluctuation of aerodynamic torque and output power of offshore wind turbines.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10176091