Cascaded H-bridge Asymmetrical Seven-level Inverter Using THIPWM for High Power Induction Motor

Multilevel inverters are well used in high power electronic applications because of their ability to generate a very good quality of waveforms, reducing switching frequency, and their low voltage stress across the power devices. This paper presents the Third Harmonic Injection Pulse Width Modulation (THIPWM) strategy of a Seven-level Uniform Step Cascaded H-bridge Asymmetrical Inverter (7-level USCHBAI). The THIPWM approach is compared to the well-known Sinusoidal PWM (SPWM) strategy. Simulation results demonstrate the better performances and technical advantages of the THIPWM controller in feeding a High Power Induction Motor (HPIM).