Three-phase Multilevel Current Source Converter with a Reduced Number of Diodes

This paper proposes a three-phase multilevel current source converter with a reduced number of diodes. Current source converters are less used than voltage source converters, and one of the reasons is the large-scale production of MOSFETs or IGBTs with an anti-parallel diode. In contrast, current source converters require a diode in series with the switches, which makes its implementation difficult since encapsulated IGBTs with this characteristic are not produced on a large scale and for low-medium power. As a result, this article intends to lower costs. By providing detailed analysis, simulation, and experimental results, this paper aims to demonstrate the feasibility and advantages of the proposed topology for multilevel current source converters. The reduction in diode count contributes to cost savings and addresses the limitations posed by the availability of encapsulated IGBTs or MOSFETs with diodes in series. Overall, the outcomes of this study have the potential to contribute to the advancement and broader adoption of current source converters in power electronics applications.