NDLI: Testing controls to mitigate fatigue loads in the controls Advanced Research Turbine

Content Provider	IEEE Xplore Digital Library
Author	Wright, A.D. Fingersh, L.J. Stol, K.A.
Copyright Year	2009
Description	Author affiliation: Department of Mechanical Engineering, The University of Auckland, New Zealand (Stol, K.A.) \|\| National Renewable Energy Laboratory, Golden CO 80401 USA (Wright, A.D.; Fingersh, L.J.)
Abstract	Wind turbines are complex, nonlinear, dynamic systems forced by aerodynamic, gravitational, centrifugal, and gyroscopic loads. The aerodynamics of wind turbines is nonlinear, unsteady, and complex. Turbine rotors are subjected to a complicated three-dimensional (3-D) turbulent wind inflow field with imbedded coherent vortices that drive fatigue loads and reduce lifetime. Design of control algorithms for wind turbines must account for multiple control objectives. Future large multi-megawatt turbines must be designed with lighter weight structures, using active controls to mitigate fatigue loads, maximize energy capture, and add active damping to maintain stability for these dynamically active structures operating in a complex environment. Researchers at the National Renewable Energy Laboratory are designing, implementing, and testing advanced controls to maximize energy extraction and reduce structural dynamic loads. These control designs are based on a linear model of the turbine that is generated by specialized modeling software. This paper describes testing of a control algorithm to mitigate blade, tower, and drivetrain loads using advanced state-space control methods. The controller uses independent blade pitch to regulate the turbine's speed in Region 3, mitigate the effects of shear across the rotor disk, and add active damping to the tower's first fore-aft bending mode. Additionally, a separate generator torque control loop is designed to add active damping to the tower's first side-side mode and the first drivetraintorsion mode. This paper discusses preliminary implementation and field tests of this controller in the Controls Advanced Research Turbine at the National Renewable Energy Laboratory. Also included are preliminary comparisons of the performance of this controller to results from a typical baseline Proportional-Integral-Derivative controller designed with just Region 3 speed regulation as the goal.
Starting Page	1275
Ending Page	1282
File Size	701477
Page Count	8
File Format	PDF
ISBN	9781424446841
DOI	10.1109/MED.2009.5164722
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-24
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Damping Region 3 Blades Poles and towers Laboratories Renewable energy resources Fatigue Aerodynamics Wind turbines Testing
Content Type	Text
Resource Type	Article

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