Design and Analysis of Seven Level Inverter Topology with Realiable Configuration for Open End Winding Induction Motor

Abstract

In This paper proposes a seven level inverter fed induction motor with much reduced number of power electronic components. Nowadays, Multilevel inverters are mostly used due to these advantages with low harmonic distortion content, reduced circuit complexity, reduced number of switches, improved voltage quality and less voltage stress on power electronic devices. 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. By using the simulation results we can analyze the proposed multilevel inverter. The proposed topology has been simulated using Matlab®/Simulink with six pole (5 HP) induction motor.