HARMONIC REDUCTION OF CASCADED MLI FED INDUCTION MOTOR DRIVE USING MODIFIED MODULATION STRATEGIES

V. Naga Bhaskar Reddy, Ch. Sai Babu, J. Venkata Ramanaiah

Abstract: This paper proposes a modulating scheme for multilevel inverters, which may conjointly work in the over modulation range, using only the offset voltage injected in reference phase voltages. It doesn’t involve any sector identification and considerably reduces the computation time when compared to the traditional space vector PWM technique. It is focused on the implementation of Cascaded H-bridge multilevel inverter fed induction motor by victimization the modulating technique of OVPWM with U-type carrier to the Five-level inverter. The PWM switching signals supported offset voltage injected in sine reference with U-type carrier been generated. a three phase Five-level cascaded inverter using IGBTs has been assembled and switched with the PWM signals generated. The multilevel inverter fed induction motor drive with SPWM and projected methods are performed and results are analyzed. The cascaded three-phase five level inverter fed induction motor simulated and therefore the performance of induction motor analyzed in varied aspects like, speed, torque etc.

Keywords: Multilevel concept, Cascade Multilevel inverter, Multi level carrier signals, Pulse width modulation, Total Harmonic Distortion

DOI: https://doi.org/10.15623/ijret.2014.0324005