Analysis of PWM Techniques for Power Quality Improvement in PMSM Drives

Inverter fed adjustable speed drives are very much needed in today motion Industry. The switching of inverter plays a vital role in the operation of a drive. This paper presents a comparison of two different pulse width modulation techniques and its performance characteristics are analyzed for PMSM drives. The analysis is carried out for the different Modulation Index (MI). The SVPWM inverter allows to nourish the motor with a greater voltage and less harmonic distortions than the conventional sinusoidal PWM inverter. The SVPWM technique is better than previous switching methodologies and comparison of both SPWM and SVPWM using MATLAB is given with respect to its RMS voltage, THD and other power quality terms.