Comparative analysis of modulation strategies applied to seven-level diode clamped multi-level inverter fed induction motor drive

This paper presents analysis and comparison of most commonly preferred pulse width modulation strategies such as PD, POD, APOD PWMs to control the speed of an induction motor by using seven level diode clamped multilevel inverter. Different multi-carrier PWM techniques are investigated for Voltages, currents, apparent power, active power, reactive power, power factor and THD. Several interesting characteristics of them are shown to help it from using it to renewable, facts, grid connected converter and industrial applications. Results are depicting the effectiveness of control in the motor speed and an enhanced drive performance through reduction in total harmonic distortion (THD). Experimental results obtained from a Hardware setup are presented, confirming the good-quality waveforms with PD-PWM and the adequate balance of all floating capacitors.