Enhanced Asymmetrical PWM AC chopper fed capacitor run induction motor drive using Bacterial Foraging Optimization Algorithm

Capacitor run induction motor drive is employed for efficient speed control in industrial applications. The phase control method has inherent drawback of poor power quality compared to multiple pulse width modulation techniques. This paper presents performance improvement of AC chopper fed capacitor run induction motor with symmetrical pulse width modulation and enhanced asymmetrical pulse width modulation. The enhanced asymmetric pulse width modulation technique is assimilated by four pulses in a quarter cycle using bacteria foraging optimization algorithm. The performance parameters are total harmonic distortion, input power factor and efficiency. Simulation results shows that proposed technique is better compared to conventional technique.