Title :
An optimal control strategy for DFIG
Author :
Barros, Luciano Sales ; Mota, Wellington Santos ; Da Silva, Jaidílson Jó ; Barros, Camila Mara Vital
Author_Institution :
Univ. Fed. Rural do Semi-Arido, Brazil
Abstract :
For doubly fed induction machines operating as wind generators (DFIG), the terminal voltage and the active power delivered to the grid are controlled by a PWM converter linked to the machine rotor. The monitoring of the direct and quadrature axis components of the rotor voltage makes possible the control of the terminal voltage and active power, respectively. Currently, this control is performed by proportional-integral (PI) blocks where the gains and time constants are tuned by trial and error method until wanted response be obtained. This work proposes a control strategy based on the system states optimal feedback. This new strategy includes the rotor current control and provides a methodology to computation of the controller parameters. Besides, for the DFIG representation, the electromechanical coupling between turbine shaft and machine rotor is taken into account. Power systems simulations were carried out to evaluate the performance of the proposed control strategy.
Keywords :
PI control; PWM power convertors; asynchronous generators; electric current control; machine control; optimal control; state feedback; PI control; PWM converter; active power; doubly fed induction machines; electromechanical coupling; machine rotor; optimal control strategy; proportional-integral control; rotor current control; rotor voltage; system states optimal feedback; terminal voltage; trial and error method; turbine shaft; wind generators; Induction generators; Induction machines; Mesh generation; Optimal control; Power generation; Pulse width modulation converters; Rotors; Voltage control; Wind energy generation; Wind power generation;
Conference_Titel :
Industrial Technology (ICIT), 2010 IEEE International Conference on
Conference_Location :
Vi a del Mar
Print_ISBN :
978-1-4244-5695-6
Electronic_ISBN :
978-1-4244-5696-3
DOI :
10.1109/ICIT.2010.5472460