Decoupled Stator Flux Oriented Control for induction motor Fed by Indirect Matrix Converter

In this paper, decoupled Stator Flux Oriented Control for induction motor drive systems Fed by Indirect Matrix Converter is described. Flux vector estimation accuracy is affected by the rotor parameters in rotor flux-oriented control. The algorithm has the disadvantage of sensitivity to rotor parameters. Aimed at these problems, a control strategy of induction motors with stator flux orientation is presented. Since the estimation of the stator flux is independent of the leakage, the steady state performance of the stator flux oriented system is insensitive to the leakage inductance. A decoupler is designed to minimize the coupling in the stator flux and rotor speed and hence the dynamic performance of the system is improved. This application utilizes the advantages of SFOC method and the advantages of indirect matrix converter. As it is known, an indirect matrix converter consists of two stages: line and load stage. The line stage is a rectifier and the load stage is conventional voltage source inverter. In the present work, in order to reduce losses in the rectifier stage, caused by snubber circuit the four-step commutation method is employed. A simulation of the overall system has been carried out to evaluate the proposed method. The obtained results are presented in this paper.