Simulation studies of current regulated PWM VSI fed multi-phase AC machine drives

Abstract

Application of power electronic converters in electric drive systems enables utilization of ac machines with a phase number greater than three. Multi-phase ac machine drive offers numerous advantages over conventional three-phase drives. In principle the control methods are same as for three phase machines. A detail modelling of n-phase (where n=odd) induction machine is presented in this paper. The model of machine, given in terms of phase variable, is transformed into a common reference frame, rotating at an arbitrary angular speed. Five-phase drives are finally chosen for the simulation study. An extensive simulation study is done for different operating conditions and the results are presented. Most application of PWM converters has a control structure comprising a current feedback loop for current regulation. This paper deals with the most commonly used hysteresis current control schemes. The reference current is taken as the ideal sinusoidal current source.