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Analytical evaluation of output current ripple amplitude in three-phase three-level inverters

Grandi, G and Loncarski, J and Dordevic, O (2014) Analytical evaluation of output current ripple amplitude in three-phase three-level inverters. IET POWER ELECTRONICS, 7 (9). pp. 2258-2268. ISSN 1755-4535

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Abstract

Nowadays, three-phase multilevel inverters are widely employed in medium and high-power applications, increasing the power ratings, improving the output voltage quality and reducing the conducted electromagnetic interferences. Despite of numerous pulse-width modulation (PWM) techniques have been developed for multilevel inverters, a detailed analysis of the output current ripple amplitude has not been reported yet. In this study, the peak-to-peak current ripple distribution over a fundamental period is analysed in details specifically for three-level three-phase voltage source inverters for both motor-load and grid-connected applications. In particular, the peak-to-peak amplitude of the current ripple is determined analytically as a function of the modulation index. The centred PWM strategy is considered in all the developments, implemented either by carrier-based or space vector (SV) PWM methods. With this modulation, the dc bus utilisation is maximised in a simple and effective way, and a nearly-optimal behaviour is obtained to minimise the current ripple rms. The results obtained in different cases and sub-cases identified in the proposed analytical approach are verified by experimental tests with reference to three-phase three-level neutral-point clamped configuration.

Item Type: Article
Uncontrolled Keywords: 0906 Electrical And Electronic Engineering
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Electronics and Electrical Engineering
Publisher: INST ENGINEERING TECHNOLOGY-IET
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Date Deposited: 04 Dec 2015 13:45
Last Modified: 04 Dec 2015 13:45
DOI or Identification number: 10.1049/iet-pel.2013.0837
URI: http://researchonline.ljmu.ac.uk/id/eprint/2435

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