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This paper addresses the problem of controlling a variable-speed wind turbinewith a Doubly Fed Induction Generator (DFIG), modeled as anelectromechanically-coupled nonlinear system with rotor voltages and bladepitch angle as its inputs, active and reactive powers as its outputs, and mostof the aerodynamic and mechanical parameters as its uncertainties. Using ablend of linear and nonlinear control strategies (including feedbacklinearization, pole placement, uncertainty estimation, and gradient-basedpotential function minimization) as well as time-scale separation in thedynamics, we develop a controller that is capable of maximizing the activepower in the Maximum Power Tracking (MPT) mode, regulating the active power inthe Power Regulation (PR) mode, seamlessly switching between the two modes, andsimultaneously adjusting the reactive power to achieve a desired power factor.The controller consists of four cascaded components, uses realistic feedbacksignals, and operates without knowledge of the C_p-surface, air density,friction coefficient, and wind speed. Finally, we show the effectiveness of thecontroller via simulation with a realistic wind profile.

Voltage/Pitch Control for Maximization and Regulation of Active/Reactive Powers in Wind Turbines with Uncertainties