CASCADED H-BRIDGE MULTILEVEL INVERTER FOR INDUCTION MOTOR DRIVES

A.Venkadesan, Priyatosh Panda, Priti Agrawal, Varun Puli

Abstract: This paper proposes a cascaded H-Bridge Multilevel inverter for induction motor drives. Multi-level Inverter (MLI) has several advantages over conventional inverter such as lower total harmonic distortion (THD), low switching loss, good power quality, high output voltage. The main feature of multilevel inverter is that it uses many small dc sources to supply various output levels. The Hbridge cascaded MLI is chosen in this paper because it requires least number of components for same voltage level. The H bridge cascaded MLI with five levels is designed. The simple multi carrier SPWM techniques namely phase disposition (PD) is used to generate pulses for the MLI. The H-bridge cascaded MLI with five levels using PD modulation technique is designed for induction motor drives. The performance of designed MLI fed induction motor drives is investigated extensively for various operating conditions through MATLAB simulation. The performance of MLI is also compared with conventional three phase inverter in terms of THD. The promising and interesting results obtained are comprehensively presented.

Keywords: Cascaded H-bridge Inverter, Multilevel Inverters, Pulse Width Modulation (PWM), induction motor drives.

DOI: https://doi.org/10.15623/ijret.2014.0305050