FUZZY SECOND ORDER SLIDING MODE CONTROL OF A DOUBLY-FED INDUCTION MACHINE SUPPLIED BY TWO MATRIX CONVERTERS

Abstract

Traditional vector control structures which include proportional-integral (PI) regulator for the speed DFIMs driven have some disadvantages such as parameter tuning complications, mediocre dynamic performances and reduced robustness. Thus, based on the analysis of the mathematical model of a DFIM supplied by two direct matrix converters, this paper addresses a non-linear control algorithm based on fuzzy logic and second order sliding mode. The conventional sliding mode control has large chattering on the electromagnetic torque developed by the DFIM. In order to solve this problem, the second order sliding mode technique with fuzzy logic functions is used. The simulation results show the effectiveness of the proposed method especially in chattering-free behaviour, response to sudden load torque variations and robustness against machine parameters variations.