A SURVEY AND STUDY OF DIFFERENT TYPES OF PWM TECHNIQUES USED IN INDUCTION MOTOR DRIVE

Switching power converters are used in industrial application to convert and deliver their required energy to the motor or lo ad because of advances in solid state power devices and microprocessors. Pulse Width Modulation variable speed drives are increasingly applied in many new industrial applications that require superior performance. The advantages of PWM based switc hing power converter over linear power amplifier are Lower power dissipation, Easy to implement and control, No temperature variation and aging-caused drifting or degradation in linearity and Compatible with today’s digital micro-processors. In this paper a survey and study of different types of pwm controlled methods are shown in thi s paper. The different PWM techniques are Single-pulse modulation, Multiple pulse modulation and Sinusoidal pulse width modulation (Carrier based Pulse Width Modulation Technique). SVPWM technique is explained in detail which improves the quality of the cu rrent and reduce the torque ripple in induction motor drive while maintaining the other performance characteristics of the system