Control of a doubly fed induction generator for aircraft application

This paper presents a variable speed constant frequency system (VSCF) for aircraft applications. The system consists in a doubly fed induction generator (DFIG) connected to a stand-alone aircraft grid through its stator windings. It uses back-to-back PWM converters connected to the rotor for sub and super synchronous speed operation. A permanent magnet synchronous machine (PMSM) connected to a variable speed prime mover supplies these converters. The control strategy of the DFIG is carried out through a rotor-flux inner control loop and a stator-voltage outer loop. The vector control of the PMSM and the DC link voltage regulation are also presented in this paper. Simulation results demonstrate the feasibility of the proposed system.