Operation Characteristics Improvement of Simplified Indirect Matrix Converter Based on Leading Current Compensation

Abstract

This paper describes an improved strategy for the total harmonic distortion of an input current of a simplified indirect matrix converter. The control of the current-source rectifier on the input side is based on space vector modulation, and a two-phase triangular carrier modulation technique is applied to the input and the output to prevent interference due to zero-vector collision between both the sides. In addition, this paper describes that the simplified indirect matrix converter cannot achieve a unity input power factor operation and harmonics reduction in the low-load range because it has a real DC bus. Therefore, leading current compensation is applied to solve the problem, focusing on the low-load range. The improved operation characteristics are confirmed through computer simulations and experimental tests. The total harmonic distortion improved by 31 points, whereas the total input power factor degraded slightly by 14 points.