Indirect field oriented control for high performance induction motor drives using space vector modulation with consideration of core loss

Abstract

Indirect field oriented control (IFOC) is known to produce high performance in induction motor (IM) drives by decoupling rotor flux and torque producing current components of stator current. The decoupling control between the rotor flux and the torque is no longer achieved in terms of stator current components considering core loss into account. To overcome the perturbation effects of core loss, we introduce a decoupled rotor flux and torque control based on the magnetizing current components by incorporating PI control system and using space vector modulation (SVM) technique. It is able to perform high performance control in IM drives using SVM technique. In order to perform the control strategy, the rotor flux and magnetizing current estimator is proposed. The design of the proposed observer is based on Lyapunov's stability method whose estimation error converges to zero exponentially irrespective of the input. Simulation results are presented to show the validity of the proposed control as well as rotor flux and magnetizing current estimation for IFOC of IM drives. A good performance is obtained by means of PI controller and SVM technique, and the rotor flux and the magnetizing current are obtained properly by the proposed observer.