Multimode space-vector overmodulation technique for enhancing voltage transfer ratio in matrix converters

Abstract

The space-vector modulation (SVM) method for matrix converters (MCs) inherently limits the voltage transfer ratio (VTR) to 0.866 in the linear modulation region, which constrains the broader application of MCs. This paper presents a detailed investigation into an overmodulation technique aimed at enhancing the VTR of MCs. The proposed method integrates the principles of inscribed circle and hexagon vectors, as well as hexagon and basic vectors, to extend the modulation range. Explicit equations for calculating the duty cycles of active and zero vectors are derived to achieve improved VTR. The effectiveness of the approach is validated through simulation results, demonstrating accurate output voltage fundamental components.