Analysis of Total Harmonic Distortion of Three-Phase Induction Motor Drive for Different PWM Techniques

Over the past few decades, induction motor has become a reliable choice in the industrial field as an electromechanical device. The inherent characteristics of an induction motor make it convenient, efficient and popular option among industrial applications. With the development of power electronic devices and power converters, it has become possible to control the speed of induction motor smoothly. Although these converters are capable of providing more flexible speed control, they also cause some technical hitches such as distorted current and voltage waveforms, increasing losses, pulsating torque etc. These are mainly due to harmonic contents added in voltage and current waveforms. Therefore, it is necessary to analyze such problems while designing efficient electric drive. This paper mainly deals with an investigation and analysis of harmonic profile executed by three-phase voltage source inverter for different PWM using Fast Fourier Transform (FFT) through MATLAB/Simulink.