An optimized dual inverter configuration for open end winding induction motor drive with Common Mode Voltage elimination

Variable speed drives system are known to bear Common Mode Voltage which causes shaft voltage, bearing currents and EMI problems. In this paper a new topology to realize multilevel operation for a 3-φ, dual inverter fed open ended winding induction motor with Common Mode Voltage (CMV) elimination is presented. The proposed dual-inverter configuration makes it easy to facilitate all the space vector combination which pertains to zero common mode voltage required for five level operation. Zero sequence voltage is strictly forced to zero by space vector strategy so this configuration does not need a sample average zero sequence elimination(SAZE) technique in space vector modulation. This novel MLI structure is requires fewer switching power devices compared to the conventional MLI for CMV elimination. Reduction in number of power switches results in less number of driver circuits, reduced installation spare and low cost. A comparison based on above constraints are given to prove superiority of proposed configuration. Simulation results are presented to validates the performance of configuration.