NDLI: Improving Power Quality in Cascade Multilevel Converters Based on Single-Phase Nonregenerative Power Cells

Content Provider	IEEE Xplore Digital Library
Author	Baier, C.R. Espinoza, J.R. Rivera, M. Munoz, J.A. Bin Wu Melin, P.E. Yaramasu, V.
Copyright Year	1982
Abstract	Interharmonics exist in the ac supply currents in ac/dc/ac drives mainly due to the poor decoupled behavior of the dc-link stage. This issue is particularly evident when different input/output operating frequencies are used, causing harmful effects on power transformers and reducing the system efficiency and power quality. Consequently, large interharmonics can be found in converters with single-phase stages, as they require large electrolytic capacitors to filter out the dc-link second harmonic of voltage and current, which is usually not fully accomplished. This is the case of the cascade multilevel converter based on single-phase power cells, where each module has a single-phase rectifier and a single-phase inverter stage that cannot be effectively decoupled with standard size capacitors. This paper shows that it is possible to improve the quality of the power cell input currents when the input/output frequencies are different in the cascade multilevel converter. This is achieved by means of magnetic couplings among the dc-links of the power cells that feed different output phases, while keeping the high power quality on the load side.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	4498
Ending Page	4509
Page Count	12
File Size	2493041
File Format	PDF
ISSN	02780046
Volume Number	61
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Harmonic analysis Power harmonic filters Capacitors Rectifiers Inverters Couplings variable-speed drives AC–AC power conversion electromagnetic coupling multicell single-phase topology multilevel system power electronics
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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