Novel Carrier-Based PWM technique for n-Phase VSI

Abstract

Multiphase machines are nowadays considered for high-power variable-speed drives applications due to numerous advantages when compared to their three-phase counterparts. Multiphase voltage source inverters are invariably used to provide multiphase variable voltage and variable frequency supply with appropriate pulse width modulation (PWM) control. In the proposed work Carrier-based PWM for n-phase VSI is implemented. This method is most common PWM technique for VSI. This paper is aimed at providing a generalised carrier-based PWM for n-phase inverters. The viability of the proposed concept is proved by simulation taking for n-phase (3, 5, 6, 7 and 9) VSI as an example. From the observation the output phase voltage from three phase to nine phase inverter is same. Increasing number of phases percentage increase in THD is observed in the carrier based PWM technique.

 

Keywords: Carrier-based, n-phase, pulse width modulation, voltage source inverter.