A Nine-Level Inverter Topology for Medium-Voltage Induction Motor Drive With Open-End Stator Winding Academic Article uri icon


  • A new scheme for nine-level voltage space-vector generation for medium-voltage induction motor (IM) drives with open-end stator winding is presented in this paper. The proposed nine-level power converter topology consists of two conventional three-phase two-level voltage source inverters powered by isolated dc sources and six floating-capacitor-connected H-bridges. The H-bridge capacitor voltages are effectively maintained at the required asymmetrical levels by employing a space vector modulation (SVPWM) based control strategy. An interesting feature of this topology is its ability to function in five-or three-level mode, in the entire modulation range, at full-power rating, in the event of any failure in the H-bridges. This feature significantly improves the reliability of the proposed drive system. Each leg of the three-phase two-level inverters used in this topology switches only for a half cycle of the reference voltage waveform. Hence, the effective switching frequency is reduced by half, resulting in switching loss reduction in high-voltage devices. The transient as well as the steady-state performance of the proposed nine-level inverter-fed IM drive system is experimentally verified in the entire modulation range including the overmodulation region. 1982-2012 IEEE.

published proceedings


author list (cited authors)

  • Rajeevan, P. P., Sivakumar, K., Gopakumar, K., Patel, C., & Abu-Rub, H.

citation count

  • 114

complete list of authors

  • Rajeevan, PP||Sivakumar, K||Gopakumar, K||Patel, Chintan||Abu-Rub, Haitham

publication date

  • September 2013