Common-mode Reduction SVPWM for Flexible Series/Parallel Motor Drives

The drive system concept based on motor with open-end windings (OEWs) is an alternative and attractive solution to provide better performance and improved figure of merits comparatively with the drive systems based on two-level (2L) converter. From this solution, a flexible series/parallel drive system for OEW three-phase machines can be achieved. It adapts the configuration as a function of the measured speed of the machine. Thus, this paper proposes a space-vector pulsewidth modulation (SVPWM) based on the vector analysis of the switching states to reduce the common-mode voltage and improve the waveform quality. The model of a dual-inverter drive system was developed, so that was possible to identify the degrees of freedom that can be used to optimize the space-vector planes. To verify the effectiveness of the proposed SVPWM, simulation results are presented, and a comparison with the conventional 2L SVPWM is also presented.