Theoretical and Experimental Analysis of the Line Current in Matrix Converters

In this paper a general approach for the determination of the line current harmonic content in matrix converters is presented. The input disturbances, such as voltage unbalance and voltage harmonics, are considered as perturbations of the fundamental component, and a small-signal analysis is used to determine the spectrum of the line current. The proposed analytical approach has a general validity, because it takes into account the effects of the line and filter impedance, the supply harmonics and the input current modulation strategy as well. Hence, it could be usefully employed to evaluate the line current quality in the point of common coupling for different filter topologies and supply distortions. Experimental results are given to confirm the analytical solution.