This paper targets the reduction of common-mode voltage in an indirect matrix converter (IMC) through an intelligent space-vector-based modulation technique. This mode of control results in lower dV/dt at the motor terminals, thereby, reducing voltage stress to windings; and reduced output voltage distortion resulting in lower machine losses. The conventional indirect space vector pulse-width modulation method of controlling matrix converters involves independent control of either the rectifying stage or the inverting stage of the converter. However, in this paper, by suitable selection of space vectors, the rectifying stage of the matrix converter generates different levels of virtual dc-link voltage. Therefore, the responsibility of formulating output voltages with a particular magnitude and frequency, which can be translated to different machine speeds, has been transferred solely to the rectifying stage of the IMC. Estimation of the degree of distortion in the three-phase output voltage is another facet discussed in this paper, which aids the sizing and designing of output passive filters. The analysis of output voltage distortion and the proposed modulation strategies have been substantiated by simulations in MATLAB/Simulink and experimentally verified on a scaled down laboratory prototype.
Bibliographical noteFunding Information:
Manuscript received May 24, 2016; revised September 6, 2016; accepted November 26, 2016. Date of publication December 29, 2016; date of current version June 23, 2017. This work was supported by the Office of Naval Research under Research Grant N00014-13-1-0511: Advanced Research in Power Electronic Systems for Naval Ships. Recommended for publication by Associate Editor M. Hagiwara.
- Common-mode voltage (CMV)
- indirect matrix converter (IMC)
- output voltage distortion
- space vector pulse-width modulation (SVPWM)