Generalized carrier based pulse width modulation technique for a three to n-phase dual matrix converter

This paper presents a novel topology for a dual three to n-phase direct matrix converter. The term "n" can be used for any number of output phases. The dual matrix converter topology is applied for open-end winding drive system in order to enhance output voltage and simultaneously eliminate common-mode voltage at the machine terminals. The input to each of the matrix converter is three phase utility grid system, whereas the output can be configured to any number of phases with variable voltage and frequency. Generalized carrier based pulse width modulation (PWM) technique is developed to control the dual matrix converters. A dual three to nine-phase matrix converter is utilized for discussion and analysis. The two matrix converters feeding the nine-phase open-end load are supplied from a common single three-phase utility source of 50 Hz. A simple R-L load is considered in the paper. The paper presents an analytical approach to obtain the expression of modulating signals that are used to generate switching pulses for the matrix converter. Simulation and experimental results are presented to support the idea of the proposed modulation scheme.