BUS CLAMPED MODULATION FOR HARMONIC MINIMIZATION IN VECTOR CONTROL OF INDUCTION MOTOR DRIVES

Induction motors have seen their applicability in both domestic and industrial sectors. Their features of reliability, lesser cost, less maintenance and good efficiency have made them hold a strong place among other electrical motors. Vector Control or filed-oriented control for Induction Motor control is adopted for obtaining good dynamic performance. Traditional Space Vector Pulse Width Modulation (TSVPWM) is a common method used to overcome harmonic and torque pulsation problems and hence increase the output voltage of the inverter with reduced harmonic compared to Sinusoidal Pulse Width Modulation (SPWM) and Hysteresis Pulse Width Modulation (HPWM). Recently, the switching schemes have been modified to reduce the harmonics further and make it suitable for low and high dynamic performance applications. One such analogy is the use of Bus Clamped Modulation scheme (BCM). The choice of BCM has a direct impact on the motor performance. The modulation technique reduces motor current distortions, pulsation in torque, inverter losses and harmonics in the inverter thus, improvising the performance of the drive. Simulation analysis is performed on MATLAB platform and the results obtained prove the efficacy of Bus Clamped Modulation analogy.