Title :
Determination of steady state control laws of doubly - fed induction generator using natural and power variables
Author :
Balogun, Adeola ; Ojo, Olorunfemi ; Okafor, Frank ; Karugaba, Sosthenes
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Lagos, Lagos, Nigeria
Abstract :
A doubly - fed induction generator (DFIG) system is presented in terms of its natural and power variables as the state variables. The natural variables are the electromagnetic torque (Te), the reactive torque (Tr), the magnitude of rotor flux linkage (λr), the magnitude of stator flux linkage (λs), and the rotor speed (ω). These are used in modelling the induction machine and the machine side converter (MSC) of the system. The real power (Pf) and reactive power (Qf) that the grid side converter (GSC) exchanges with the grid make up the power variables of the system and are used to model the GSC. Simulation of the dynamic natural variable model of the induction machine is carried out and the results are compared with a conventional induction machine simulation technique. Steady state analysis is presented for various power factor operations. A method of predicting an optimal stator power factor operation is proposed.
Keywords :
asynchronous generators; machine control; power factor; rotors; stators; torque; DFIG system; doubly-fed induction generator; electromagnetic torque; grid side converter; induction machine; machine side converter; natural variables; power factor operation; power variables; reactive power; reactive torque; real power; rotor flux linkage magnitude; stator flux linkage magnitude; steady state control laws; Couplings; Equations; Mathematical model; Reactive power; Rotors; Stators; Torque;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2010 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-5286-6
Electronic_ISBN :
978-1-4244-5287-3
DOI :
10.1109/ECCE.2010.5617750