Abstract
This paper introduces space vector modulation (SVM) schemes for reducing the common mode voltage (CMV) of a direct three-to seven-phase matrix converter (3x7 MC) fed a seven-phase induction motor. The proposed techniques are based on the indirect SVM (ISVM) in which the 3x7 MC can be modeled as a three-phase rectifier followed by a seven-phase inverter. The CMV reduction is achieved by suggesting three-ISVM schemes that are capable of reducing the peak CMV of the MC by 20%, 38% and 50% respectively compared with the conventional modulation strategy. The selection criterion to the suitable voltage space vectors and their proper arrangement within the switching cycle are described. The proposed ISVM schemes are assessed by simulating a direct 3x7 MC fed seven-phase IM using Matlab/Simulink. The effect of different modulation schemes on the motor phase currents and output torque is also investigated.