A Novel PWM Inverter Powered by Single DC Source for a Multiple Pole Pair Induction Motor

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A Novel PWM Inverter Powered by Single DC Source for a Multiple Pole Pair Induction Motor

Year : 2024

Publisher : Springer Science and Business Media Deutschland GmbH

Source Title : Lecture Notes in Electrical Engineering

Document Type :

Abstract

In this paper, a customized multi-level inverter configuration designed for driving an induction motor with multiple pole pairs is introduced. Within the induction motor, each pole pair winding coil spaced 360° (electrically) apart maintains the same voltage profile. In our case, two windings in a four-pole induction motor are deliberately disconnected. A dual two-level inverter is used to power each half of the winding, so two such inverters are used to feed the entire stator winding of the induction motor as pole pair windings are disconnected. The single DC source used to power these inverters has a magnitude of Vdc/4, or 25% of input voltage DC bus voltage needed to power a typical Neutral Point Clamped five-level inverter. This new Pulse Width Modulation approach is used to cancel the harmonics at first center band while controlling the inverter output voltage. This method successfully lowers torque ripple by reducing current ripple. Furthermore, power balancing problems are eliminated because the single DC source is supplying the entire topology. The capacitor voltage balancing problems are also resolved because this design is derived using only two-level inverters. Very few changes to the design are needed for the suggested topology; the main change is to disconnect winding coils with the same voltage profile. The efficacy of the proposed inverter employing the innovative PWM technique in the linear modulation region is demonstrated by simulation results utilizing a 5-hp four-pole induction motor in MATLAB (Simulink).