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Analysis and Comparison of Peak-to-Peak Current Ripple in Two-Level and Multilevel PWM Inverters
University of Bologna.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Liverpool Joh Moores University.
2015 (English)In: IEEE Transactions on Industrial Electronics, Vol. 62, no 5, 2721-2730 p.Article in journal (Refereed) Published
Abstract [en]

Three-phase multilevel inverters are used in many medium- and high-power applications such as motor drives and grid-connected systems. Despite numerous PWM techniques for multilevel inverters have been developed, the impact of these modulation schemes on the peak-to-peak output current ripple amplitude has not been addressed yet. In this paper the analysis and the comparison of current ripple for two- and three-level voltage source inverters are given. Reference is made to optimal and popular modulation, so-called centered PWM, easily obtained by both carrier-based modulation (phase disposition, with proper common-mode voltage injection) and space vector modulation (nearest three vectors). It is shown that the peak-to-peak current ripple amplitude in three-level inverters can be determined on the basis of the ripple in two-level inverters, obtaining the same re-sults as by directly analyzing the output voltage waveforms of the three-level inverters. This procedure can be readily extended to higher level numbers. The proposed analytical developments are verified by both numerical simulations and experimental tests.

Place, publisher, year, edition, pages
IEEE, 2015. Vol. 62, no 5, 2721-2730 p.
Keyword [en]
Multilevel inverters; three-level inverter; output current ripple; carrier-based PWM; space vector PWM.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
URN: urn:nbn:se:uu:diva-236640DOI: 10.1109/TIE.2014.2363624ISI: 000352706000007OAI: oai:DiVA.org:uu-236640DiVA: diva2:764830
Available from: 2014-11-20 Created: 2014-11-20 Last updated: 2015-06-30Bibliographically approved

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