Analysis of three-phase input to five-phase output matrix converter using direct transfer function approach

Abstract

This paper analyzes a three-phase fixed input to five-phase variable amplitude/frequency output matrix converter topology to feed a five phase system. Conventionally, back-to-back topology is employed, which requires dc-link capacitor and needs large energy storage elements. This is disadvantageous for low space applications like aeroplanes, electric vehicles etc. The alternative is seen in matrix converters. The maximum limit on attainable output voltage in a three-phase input matrix converter is found to be 50 % of the input voltage. It is found that this limit can be increased to 78.86 % for three-phase input to five-phase output matrix converter. To achieve this, input and output waveforms are optimized. Coefficients are accordingly derived. A simplified modulation method for five-phase output is defined. The simulation results that are obtained by applying input filter show practical feasibility.