Title: A new switching method for multi-level asymmetric CHB to reduce THD and torque ripple in IM drive

Authors: Ladan Abootorabi; M.R. HasanZadeh Aghdam; Hossein Torkaman

Addresses: Department of Electrical, Biomedical and Mechatronics Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran ' Faculty of Electrical Engineering, Shahid Beheshti University, Tehran, Iran ' Faculty of Electrical Engineering, Shahid Beheshti University, Tehran, Iran

Abstract: This paper presents a new switching method for a multi-level asymmetrical cascaded H-bridge inverter that feeds an induction motor (IM). This strategy aims to reduce the total harmonic distortion (THD), torque ripple, and stress on switches. In this inverter, there are three H-bridges in each phase, whose voltage sources are unequal, so the number of levels reaches 27. The H-bridges modules with different voltage sources are switched separately by considering the reference voltage obtained from the control method. In this technique, the motor supplies load from low operating frequencies to the nominal value with the minimum torque ripple and currents' THD in all load conditions. Moreover, this technique has essential advantages including more simplified implementation, less switching losses, longer equipment lifetime as the result of a minimised voltage stress, higher voltage levels achievement, and independent operation of each H-bridge. Finally, different performance indices of this method as compared to the other ones go to show the high efficiency and applicability of the proposed technique.

Keywords: multilevel inverter; induction motor drive; reduction THD; improve torque ripple.

DOI: 10.1504/IJPELEC.2024.137808

International Journal of Power Electronics, 2024 Vol.19 No.3/4, pp.285 - 301

Received: 11 May 2022
Accepted: 01 Mar 2023
Published online: 05 Apr 2024 *

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