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

Electronics

Weder Tótola Nunes¹  Lucas Frizera Encarnação³  Mauricio Aredes² 

[1] 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 Rio de Janeiro, Av. Athos da Silveira Ramos 149-Cidade Universitária, 21941-914, Rio de Janeiro/RJ, Brazil; E-Mail:;Department of Electrical Engineering , Federal University of Espírito Santo, Av. Fernando Ferrari, Campus Universitário, 29060-900 Vitória/ES, Brazil; E-Mail:

关键词: multilevel asymmetric cascaded;    D-STATCOM;    hybrid modulation;   

DOI  :  10.3390/electronics4020311

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.