Abstract
A new control algorithm for a MW class spar-type floating offshore wind turbine has been developed to improve its performance and to reduce its mechanical load. The new blade pitch control having two PI control loops applied for different wind speed regions were designed. The bandwidth of the controller at near above-rated wind speed region was made lower to keep the vibration mode of the floating platform from being driven, and the bandwidth of the controller at far above-rated wind speed region was made higher to improve the wind turbine performance. Also, a feedback control loop using the angular acceleration information of the nacelle in the fore-aft direction was designed additionally to reduce the tower vibration. To perform modeling and simulation, a commercial multidynamics simulation program widely used for wind turbine design and certification, DNV-GL Bladed was used. The DNV-GL Bladed simulation results for the proposed new control algorithm showed that the output performance is improved and the tower load is reduced in various wind speeds above the rated wind speed.
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Abbreviations
- Δθ Blade cmd :
-
Difference in command and measured pitch angle
- θ :
-
Pitch angle
- K P :
-
Proportional gain
- K I :
-
Integral gain
- ω(t):
-
Angular velocity of generator
- ω ref :
-
Reference angular velocity of generator
- x faft :
-
Displacement in fore-aft
- m :
-
Mass
- c :
-
Damping coefficient
- k :
-
Spring constant
- F thrust :
-
Thrust force of wind turbine
- τ :
-
Time constant
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Oh, Y., Kim, K., Kim, H. et al. Control algorithm of a floating wind turbine for reduction of tower loads and power fluctuation. Int. J. Precis. Eng. Manuf. 16, 2041–2048 (2015). https://doi.org/10.1007/s12541-015-0265-0
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DOI: https://doi.org/10.1007/s12541-015-0265-0