Title :
Observer backstepping control for variable speed wind turbine
Author :
Galeazzi, Roberto ; Gryning, Mikkel P. S. ; Blanke, Mogens
Author_Institution :
DTU Electr. Eng., Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
This paper presents an observer backstepping controller as feasible solution to variable speed control of wind turbines to maximize wind power capture when operating between cut-in and rated wind speeds. The wind turbine is modeled as a two-mass drive-train system controlled by the generator torque. The nonlinear controller aims at regulating the generator torque such that an optimal tip-speed ratio can be obtained. Simply relying on the measured rotor angular velocity the proposed observer backstepping controller guarantees global asymptotic tracking of the desired trajectory while maintaining a globally uniformly ultimately bounded torsional angle. The proposed controller shows convincing performance when simulated in closed loop within a stochastic environment.
Keywords :
angular velocity control; angular velocity measurement; drives; nonlinear control systems; observers; power generation control; power transmission (mechanical); torque control; wind power plants; wind turbines; cut-in wind speeds; generator torque regulation; global asymptotic tracking; global bounded torsional angle; nonlinear controller; observer backstepping controller; optimal tip-speed ratio; rated wind speeds; rotor angular velocity measurement; two-mass drive-train system; ultimate bounded torsional angle; uniform bounded torsional angle; variable speed control; variable speed wind turbine; wind power capture maximization; Aerodynamics; Backstepping; Generators; Observers; Rotors; Shafts; Torque;
Conference_Titel :
American Control Conference (ACC), 2013
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4799-0177-7
DOI :
10.1109/ACC.2013.6579973