Adaptive Disturbance Tracking Control for Large Horizontal Axis Wind Turbines in Variable Speed Region II Operation

2010 ◽  
Author(s):  
Mark Balas ◽  
Qian Li ◽  
Ryan Peterman
Keyword(s):  
Wind Turbines ◽  
Tracking Control ◽  
Horizontal Axis ◽  
Variable Speed ◽  
Horizontal Axis Wind Turbines ◽  
Disturbance Tracking Control ◽  
Region Ii

scholarly journals New Airfoils for Small Horizontal Axis Wind Turbines

1998 ◽  
Vol 120 (2) ◽  
pp. 108-114 ◽  
Author(s):  
P. Gigue`re ◽  
M. S. Selig
Keyword(s):  
Wind Turbines ◽  
Leading Edge ◽  
Reynolds Numbers ◽  
Horizontal Axis ◽  
Variable Speed ◽  
Edge Roughness ◽  
Horizontal Axis Wind Turbines ◽  
Wind Energy Systems ◽  
Drag Ratio ◽  
Lift To Drag Ratio

In a continuing effort to enhance the performance of small wind energy systems, one root airfoil and three primary airfoils were specifically designed for small horizontal axis wind turbines. These airfoils are intended primarily for 1–5 kW variable-speed wind turbines for both conventional (tapered/twisted) or pultruded blades. The four airfoils were wind-tunnel tested at Reynolds numbers between 100,000 and 500,000. Tests with simulated leading-edge roughness were also conducted. The results indicate that small variable-speed wind turbines should benefit from the use of the new airfoils which provide enhanced lift-to-drag ratio performance as compared with previously existing airfoils.

Disturbance Tracking and Blade Load Control of Wind Turbines in Variable-Speed Operation

2003 ◽  
Author(s):  
Karl A. Stol
Keyword(s):  
Wind Turbines ◽  
Tracking Control ◽  
Nonlinear Effects ◽  
Load Control ◽  
Variable Speed ◽  
Composite State ◽  
Energy Capture ◽  
Simulation Results ◽  
State Models ◽  
Disturbance Tracking Control

A composite state-space controller was developed for a multi-objective problem in the variable-speed operation of wind turbines. Disturbance Tracking Control theory was applied to the design of a torque controller to optimize energy capture under the influence of persistent wind disturbances. A limitation in the theory for common multi-state models is described, which led to the design of a complementary pitch controller. The goal of the independent blade pitch design was to minimize blade root fatigue loads. Simulation results indicate an 11% reduction in fatigue damage using the proposed controllers, compared to a conventional torque-only design. Meanwhile, energy capture is almost identical, partly because of nonlinear effects.

Adaptive Disturbance Tracking Control With Wind Speed Reduced Order State Estimation for Region II Control of Large Wind Turbines

2012 ◽  
Author(s):  
Kaman S. Thapa Magar ◽  
Mark J. Balas ◽  
Susan A. Frost
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Tracking Control ◽  
State Feedback ◽  
Offshore Wind Turbine ◽  
Partial State ◽  
Disturbance Tracking Control ◽  
Region Ii ◽  
Large Wind

In this paper we introduce an Adaptive Disturbance Tracking Control (ADTC) Theory and make some modifications to implement it to address Region II control problem of large wind turbines. Since ADTC requires measurement of wind speed, a wind speed and partial state estimator based on linearized lower-order model of wind turbine at Region II operating point was developed. The estimated wind speed was then used with the adaptive controller and the states were used for state feedback. The combination of partial state feedback and adaptive disturbance tracking control is implemented in National Renewable Energy Laboratory (NREL)’s 5 MW offshore wind turbine model and simulated in MATLAB/Simulink. The simulation result was then compared with existing fixed gain controller.

Disturbance Tracking Control and Blade Load Mitigation for Variable-Speed Wind Turbines

2003 ◽  
Vol 125 (4) ◽  
pp. 396-401 ◽  
Author(s):  
Karl A. Stol
Keyword(s):  
State Space ◽  
Fatigue Damage ◽  
Wind Turbines ◽  
Tracking Control ◽  
Variable Speed ◽  
Energy Capture ◽  
State Models ◽  
Linear State ◽  
Disturbance Tracking Control ◽  
Estimator Design

A composite linear state-space controller was developed for a multi-objective problem in the variable-speed operation of wind turbines. Disturbance Tracking Control theory was applied to the design of a torque controller to optimize energy capture under the influence of persistent wind disturbances. A limitation in the theory for common multi-state models is described; this led to the design of a complementary pitch controller. The goal of the independent blade pitch design was to minimize blade root fatigue loads. A SymDyn model of a two-bladed, 600-kW machine was used for the simulation studies. Results indicate a 24% reduction in blade fatigue damage using the proposed controllers, compared to a conventional torque-only design. However, energy capture was not improved as much as expected, partly due to nonlinearity effects degrading the performance of the state-space estimator design. Tower base fatigue damage was shown to decrease significantly using active pitch.

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