64 Acta Electrotechnica et Informatica Vol. 8, No. 2, 2008, 64–69 ISSN 1335-8243 © 2008 FEI TUKE MATRIX CONVERTER FOR SIX PHASE INDUCTION MACHINE DRIVE SYSTEM Noureddine MANSOUR * , Abdelkader DJAHBAR ** , Benyounes MAZARI *** * University of Bahrain, College of Engineering, ISA Town, Kingdom of Bahrain ** Department of Electrical Engineering, Faculty of Sciences, UHB-Chlef, Algeria *** Department of Electrical Engineering, Faculty of Engineering, UST-Oran, Algeria e-mail: nmansour@eng.uob.bh ABSTRACT In this paper, a novel vector controlled six- phase induction machine which is fed from six-phase matrix converter is proposed. Though the practical implementation of matrix converter to vector controlled three phase induction motors is limited and still under investigation due to switches devices implementation difficulties and complication of modulation technique and commutation control, but all research works published so far agreed that the performances of three phase induction motors supplied from matrix converters are superior to that obtained using conventional pulse width modulation controlled inverter. Owing to that, we propose in the present work via simulation the application of six phase matrix converter for the supply of vector controlled six phase induction machines. The paper discusses all components used in the simulation, namely the vector control law, six phase matrix converter as well as the mathematical model of a six phase induction machine with electrical angle between any two three phase stator winding equal to 60 electrical degrees. A scalar modulation scheme with three intervals which ensures high performance and meets desired requirements is used for the control of matrix converter. Simulation results obtained are very satisfactory and demonstrate the possibility of using vector control of six-phase induction machine fed from a six- phase matrix converter. We believe that simulation results obtained will be of great benefit for the future practical investigations. Keywords: Six-phase Matrix Converter, vector control, six-phase induction machine. 1. INTRODUCTION Matrix converter fed motor drive is superior to pulse width modulation (PWM) inverter drives because it provides bidirectional power flow, sinusoidal input/output currents, and adjustable input power factor. Furthermore, matrix converter allows a compact design due to the lack of dc-link capacitors for energy storage. However, only a few of practical matrix converters have been applied to vector control system of induction motors for some well- know reasons [1]: 1) Implementation of switch devices in matrix converter is difficult; 2) Modulation technique and commutation control are more complicated than conventional PWM inverter. Six-phase ac motor drives are often considered as a viable solution when reduction of the converter per-phase rating is required due to the high motor power. The standard choice is a six-phase induction machine with two three-phase windings on stator [2]. The special displacement between the two three-phase windings is 60° and neutral points of two windings are normally isolated. If the neutral points of the two three-phase windings are isolated, torque is produced by the fundamental stator current harmonic only. If the neutral points are connected, torque production can be enhanced by the third harmonic stator current injection. Fig. 1 Circuit diagram of six-phase matrix converter fed six phase induction machine (SPIM). V i1 V i2 V i3 N S 111 S 112 S 113 S 121 S 122 S 123 S 131 S 132 S 133 V fs V cs FILTER S 221 S 222 S 223 S 211 S 212 S 213 S 231 S 233 S 232 V ds V es V bs V as V ar V dr V br V er V cr V fr SPIM