Modeling and Control of Brushless Doubly-Fed Induction Generators in Wind Energy Applications

Abstract

In this paper, brushless doubly fed induction generator (BDFIG) used for the wind energy conversion system is proposed. The BDFIG employs two cascaded induction machines to eliminate the brushes and copper rings in the traditional DFIG. The dynamic model of BDFIG with two machines' rotor connected is presented and the control strategy for flexible power flow control is developed. The independent control of the active and reactive power flow is achieved by means of a four-quadrant power converter under the closed-loop stator flux oriented control scheme. The simulation results verified the control algorithm.