Title: Analysis of effective discontinuous decoupled PWMS for a four-level open end winding induction motor drive through stator flux ripple

Authors: Kalyan Kumar Koppolu; K. Anuradha; M. Surya Kalvathi

Addresses: Department of Electrical and Electronics Engineering, Jawaharlal Nehru Technological University Kakinada, Kakinada, Andhra Pradesh, 533003, India; Vardhaman College of Engineering, Kacharam, Shamshabad, 501 218, India ' Department of Electrical and Electronics Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, 500090, India ' Department of Electrical and Electronics Engineering, Jawaharlal Nehru Technological University Hyderabad, Hyderabad –500 085, India

Abstract: Dual inverter fed open-end 3Ø induction motor drive (OEW-IMD) with different dc-link voltages can perform four-level (4L) realisation. Now the earlier scheme operates with high conduction losses and dv/dt at particular voltage symmetries that effects overall efficiency. This paper proposes the effective discontinuous decoupled SVPWM (EDDPWM) scheme, which deals the DD-PWM with a concept of effective time employment to high voltage side inverter and low voltage side inverter independently that are labelled as EDDPWM-1 and EDDPWM-2, respectively. A factor variable k relating to active time of vectors application is presented. For k is varied from 10% to 100% of individual inverters that effects both individual and net inverter voltage vectors of a dual inverter. Therefore, the effect of factor k on ripple content, harmonic spectra of motor currents for insight of torque ripple, and different characteristics are analysed. These proposed methods achieved flexible performance enhancement compared to previous methods.

Keywords: dual inverter; OEW-IMD; open-end winding induction motor drive; current ripple; flux ripple; DDPWM; pulse width modulation; dv/dt of PSDs; conduction losses; EDDPWM; effective discontinuous decoupled PWM.

DOI: 10.1504/IJEHV.2020.113098

International Journal of Electric and Hybrid Vehicles, 2020 Vol.12 No.4, pp.349 - 379

Received: 23 Jun 2020
Accepted: 19 Aug 2020

Published online: 28 Jan 2021 *

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