Balancing energy capture and structural loads on variable speed wind turbines

1997 ◽  
Author(s):  
John VandenBosche ◽  
Andrew Swift ◽  
Emil Moroz ◽  
John VandenBosche ◽  
Andrew Swift ◽  
...  
Keyword(s):  
Wind Turbines ◽  
Variable Speed ◽  
Energy Capture ◽  
Balancing Energy

Aerodynamic optimization for variable-speed wind turbines based on wind energy capture efficiency

2018 ◽  
Vol 221 ◽  
pp. 508-521 ◽  
Author(s):  
Minghui Yin ◽  
Zhiqiang Yang ◽  
Yan Xu ◽  
Jiankun Liu ◽  
Lianjun Zhou ◽  
...  
Keyword(s):  
Wind Energy ◽  
Wind Turbines ◽  
Capture Efficiency ◽  
Variable Speed ◽  
Aerodynamic Optimization ◽  
Energy Capture

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.

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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