An optimum and reliable new multilevel inverter topology for open end winding induction motor

This paper presents a new Multilevel inverter fed induction motor with much reduced number of power electronic components. The proposed topology has been designed by connecting the multiple number of three phase two level inverters in back to back arrangement. The power quality is proportional to the number of levels in the output voltage waveform, however increasing the levels in output voltage beyond certain limit is not economical and adoptable. This question of limit on the level is also addressed in this paper. More over the voltage rating of the input DC voltage source in this topology is one third of that of the existing established topologies. A simple single triangular pulse width modulation scheme is incorporated. The proposed topology has been simulated using Matlab®/Simulink with six pole (5 HP) induction motor.