A Multilevel Voltage Source Inverter for Two-Phase AC Motor Drive Systems

This paper presents and studies a multilevel converter with two DC voltage sources and three H Bridges. The inverter modulates two independent single-phase voltages using a four wires output. The design of the inverter allows five levels to the modulated voltages that feed an asymmetrical two windings phase induction motor. The classical SPWM technique was used to modulate the multilevel power inverter switches; the frequency of the carrier (a triangular wave) was varied and total harmonic distortion (THD) of voltages and currents were compared. The simulation results were obtained using the Matlab/Simulink (R)/SimPowerSystems software

New Real Coordinates Model for an Asymmetrical Six-Phase Induction Machine

This article presents an approach for the modulation of an asymmetric six-phase induction machine. The developed model is formed by two sets of three-phase stator windings that are displaced by 60 degrees. Since this kind of machines can have stator windings displaced with different angles this model also allows choosing another angle. Due to the fact that the induction machine was fully implemented in real coordinates, it is possible to simulate stator and rotor faults without being necessary to change system equations, only system parameters. The simulated results are used to validate the model