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Evaluation of DC-link voltage switching ripple in multiphase PWM voltage source inverters

Vujacic, M, Dordevic, O and Grandi, G Evaluation of DC-link voltage switching ripple in multiphase PWM voltage source inverters. IEEE Transactions on Power Electronics. ISSN 1941-0107 (Accepted)

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Abstract

This paper presents a generalized approach towards the dc-link voltage switching ripple analysis in two-level multiphase PWM voltage source inverters with balanced load. Since voltage ripple is one of the crucial sizing criteria for dc-link capacitor, simple and practical equation for designing the dc-link capacitor, based on the maximum (peak-to-peak) value of the dc-link voltage ripple, has been proposed for multiphase inverters. The amplitude of the dc-link voltage switching ripple is analytically derived as a function of operating conditions. The effect of the number of phases on the dc-link capacitor size is investigated as well. It is found that considering the same total output current, the dc-link capacitor size is reduced increasing the number of phases up to seven. However, from the point of view of dc-link capacitor size, there are no benefits of further increasing the number of phases. Reference is made to two commonly used modulation strategies – sinusoidal PWM and continuous symmetric centered PWM (i.e., space vector). The mathematical models derived aim to provide precise dc-link capacitor sizing and hence improve the power density of the whole system. Comparison of different phase numbers has been made. Proposed theoretical developments are verified by simulation and experimental tests.

Item Type: Article
Additional Information: © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: 0906 Electrical and Electronic Engineering
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Electronics & Electrical Engineering
Publisher: IEEE
Date Deposited: 30 Aug 2019 09:18
Last Modified: 30 Aug 2019 09:30
URI: http://researchonline.ljmu.ac.uk/id/eprint/11228

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