An isolated/non-isolated novel multilevel inverter configuration for a dual three-phase symmetrical/asymmetrical star-winding converter

This article is devoted to the development of a novel isolated/non-isolated multilevel inverter configuration for a dual three-phase star-winding converter. The proposed topology fits the (low-voltage/high-current) applications of medium-power, AC tractions and More-Electric Aircraft (MEA) propulsion systems. The power circuit module consists of voltage source inverters (VSIs) with isolated/non-isolated DC supply. Further, each single phase of the VSI is introduced with one bi-directional switching device (MOSFET/IGBT) and two capacitors with linked neutral points. Also, an original modified single-carrier five-level modulation (MSCFM) algorithm is developed in this article that easy to implement in real digital processors. The proposed modulation algorithm generates 5-level output voltages at each terminal of the VSI as equivalent to standard multilevel inverters. The observed results are presented by numerical modeling of the complete AC converter system with (Matlab/PLECS) simulation software. The investigation confirms that the results are in good agreement with the developed theoretical background and the proposed multilevel inverter is applicable to asymmetrical and symmetrical dual three-phase star-winding converter configurations.