Comparison of Multi-level inverters by reducing common mode voltages and DC-link capacitor voltage balancing for IM drives
نویسنده
چکیده
In PWM inverter-fed drives, a variation of Common mode voltage (CMV) causes unbalanced voltage operation in induction motor. Multilevel inverters reduce this problem, but the complexity of the power circuit increases with an increase in the number of inverter voltage levels. In this paper, a five-level inverter is compared with two, three and four levels and this five level structure is proposed for open-end winding induction motor (IM) drives. It consists of cascaded two conventional two-level and three-level inverters. The DC link power supply requirement is also optimized by means of DC link capacitor voltage balancing, with PWM control, using only inverter switching state redundancies. In the considered configuration the two two-level inverters are shared by the two three-level inverters at both ends of the motor
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