Substantial advantages of brushless doubly-fed induction machine (BDFIM) bring up it as an interesting alternative for conventional solutions. In order to better analyse of BDFIM performance, it is required to employ a more precise model of BDFIM. In this paper, an approach, which completely relies on dynamic modelling in the arbitrary reference frame, is proposed to consider both iron loss and main flux saturation effects in two-axis model of BDFIM. In this regard, dynamic and static inductances are derived by using magnetizing flux curve obtained in terms of magnetizing current. If the cross-saturation is ignored, the time derivative of magnetizing inductances will yield incorrect simulation results. Therefore, to increase the accuracy, the proposed model contains terms which describe the cross-saturation effect. Due to the close relation between torque and power, torque expression is also achieved in the presence of iron loss and magnetic saturation using expression of electrical input power. The simulation and experimental results are finally given to show the performance of the proposed model.

Keywords