Performance of 7-level cascade H-bridge multi level inverter driven induction motor drive

Abstract

In recent times, many of industrial applications require smooth control over a wide range of speeds or smooth torque control without effecting motor performance and efficiency. So, cascaded H-Bridge multilevel inverters convert the low or medium level voltage to medium or high level of output voltages. In this paper, a cascaded H-Bridge multilevel seven level inverter is operated by using sinusoidal pulse width modulation technique. This PWM technique will improves the smoothness of waveform by reducing the lower order harmonics. And analysed its performances like speed, torque, THD etc.

Keywords

• chb mli- cascade h-bridge multi-level inverter
• spwm- sinusoidal pulse width modulation
• thd- total harmonic distortion
• pd – phase disposition
• pod – phase opposition
• apod – alternate phase opposition disposition
• pspwm – phase shift pwm
• copwm- carrier over lapping pwm
• mcspwmvf – multi carrier sinusoidal pulse width modulation with variable frequency