Common mode voltage reduction in open-end multi-phase load system fed through matrix converter

Abstract

In this paper reduction of common mode voltage (CMV) for five phases open end load system is discussed. Open end load is fed through three-to-five phases dual matrix converters (DMC). Space vector pulse width modulation (SVPWM) technique is used for the modulation of the DMC which is assumed to have two stages rectification and inversion. Their controls are separate and independent of each other. The rectifier output is considered as a fictitious DC voltage and an input for the inverter. The CMV is reduced by proper selection and placement of the active vectors in the inversion stage. The performance of the matrix converter is discussed. By an appropriate vector selection, the proposed technique is capable to reduce the CMV magnitude as well as the peak in the output of the open end load. Moreover, the input power factor remains unity and the voltage transfer ratio is increased up to 150% when compared with a simple three-to-five phases matrix converter (MC). The proposed technique is validated by simulation and experimental results.