Analysis of Harmonics Distortion in Direct Matrix Drive Loaded Industrial Power Grid

Direct matrix drive is a single-stage converter which directly connects a three-phase voltage source to a three-phase induction motor without DC link and energy storage components. Matrix drive is a new generation of electrical drives. Despite many advantages, induction motor loaded direct matrix converter induces certain harmonics level to power distribution lines. In this paper an influence of direct matrix converter based drive to harmonics distortions at the point of connection to power grid is analysed and compared to influence of conventional two stages converter based drive. Also, an effect of harmonics attenuation filter components values dispersion is analysed. The research was performed in way of mathematical calculations and simulation by Matlab/Simulink.