Optimal control of a high efficiency low distortion 6-level hybrid multilevel motor drive

The paper deals with optimal design and control of electric drives. A hybrid multilevel inverter drive structure is proposed in order to reduce converter switching losses and motor switching induced losses. Analysis demonstrates that low order harmonics may be generated by these type of converters when employing inappropriate control approaches. It proposes a control approach that features low tracking distortion over full range of operating points, during transients and inverter capacitor voltage imbalances, while minimizing switching losses. Proposed multilevel inverter control scheme is integrated into an MPC control scheme that optimally controls the drive.