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Open AccessArticle

An Improved Asymmetric Cascaded Multilevel D–STATCOM with Enhanced Hybrid Modulation

Department of Electrical Engineering, Federal Institute of Espírito Santo, Av. Vitória 1729, Jucutuquara, Campus Vitória, 29040-780 Vitória/ES, Brazil
Department of Electrical Engineering , Federal University of Espírito Santo, Av. Fernando Ferrari, Campus Universitário, 29060-900 Vitória/ES, Brazil
Department of Electrical Engineering, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos 149-Cidade Universitária, 21941-914, Rio de Janeiro/RJ, Brazil
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Bimal K. Bose
Electronics 2015, 4(2), 311-328;
Received: 30 December 2014 / Revised: 15 May 2015 / Accepted: 27 May 2015 / Published: 3 June 2015
(This article belongs to the Special Issue Multi-Level Converters)
PDF [1305 KB, uploaded 3 June 2015]


Problems related to power quality, which in the last years were responsible only for small losses in low-voltage distribution systems, are now causing damage to power apparatuses and financial losses also in medium-voltage systems. The necessity of a better quality of power supply encourages the development of new specific custom power devices directly connected in medium-voltage distribution systems. It is well know that the multilevel converters are capable of being installed directly in the medium voltage, and presents several advantages when compared with conventional two-level converters. Some topologies, like the asymmetric cascaded multilevel converter, presents difficulties in regulating the voltages of all isolated dc-link capacitors. In this context, this article presents an asymmetric nineteen-level D–STATCOM (Distribution Static Synchronous Compensator) with a reactive power and dc-link regulation control loops for generic cascaded multilevel converters in order to improve the power quality in medium-voltage distribution systems. The performance of the proposed control method for a multilevel D–STATCOM is presented and evaluated in a downscaled prototype. View Full-Text
Keywords: multilevel asymmetric cascaded; D-STATCOM; hybrid modulation multilevel asymmetric cascaded; D-STATCOM; hybrid modulation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Nunes, W.T.; Encarnação, L.F.; Aredes, M. An Improved Asymmetric Cascaded Multilevel D–STATCOM with Enhanced Hybrid Modulation. Electronics 2015, 4, 311-328.

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