1. Introduction

Three-phase voltage source inverters (VSIs) are widely utilized in ac motor drives, controlled rectifiers, and in general grid-connected applications as dc–ac power conversion devices. In general, the problems related to high-power applications can be overcome by the increase of the number of phases. The increase of the phase number is considered a viable solution and has become more and more used in order to obtain additional degree of freedom. Multiphase motor drives have many advantages over the traditional 3-phase motor drives. Most important are ability to reduce the amplitude and to increase the frequency of torque pulsations, to reduce the rotor harmonic current losses and to lower the dc link current harmonics. Additionally, due to their redundant structure, multiphase motor drives improve the system reliability.