Performance Analysis of Three Phase PWM Voltage Source Inverter Fed Three Phase Induction Motor Drive

This paper deals with the performance analysis of three phase induction motor drive fed by a PWM voltage source inverter. The PWM method, which involves the modulation of conventional sinusoidal reference signal and a triangular carrier is used here to produce pulse width modulated output only for under modulation index. This paper work deals mainly with the performance analysis of three phase induction motor fed by PWM voltage source inverter in terms of phase current of inverter, rotor and stator current , speed ,electromagnetic torque developed and total harmonic distortion in line and phase voltage of inverter for under modulation range i.e. ma<1. For the implementation of the proposed drive the MATLAB/SIMLINK environment has been used. Two types of the switching techniques are available for the production of the balanced three phase output voltage i.e. either unipolar scheme or bipolar scheme but only unipolar scheme has been used as it offers several advantages. The performance of the inverter has been carried out by using the parameter total harmonic distortion. The impact of the modulation index on the performance of the inverter has been done in terms of the waveforms for inverter phase voltage, line voltage, line current, stator current, rotor current, rotor speed and electromagnetic torque developed by the motor