On Inherent Redundancy of MMC-Based STATCOMs in the Overmodulation Region

Allan Fagner Cupertino; Heverton Augusto Pereira; Seleme Isaac Seleme; Remus Teodorescu

doi:10.1109/TPWRD.2019.2936784

On Inherent Redundancy of MMC-Based STATCOMs in the Overmodulation Region

Allan Fagner Cupertino^*, Heverton Augusto Pereira, Seleme Isaac Seleme, Remus Teodorescu

^*Kontaktforfatter

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

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Abstract

Modular multilevel converters (MMCs) are frequently featured to their modular structure, which results in fault-tolerant operation and easy redundancy realization. Nevertheless, in order to reach a given redundancy factor, more cells must be included in the converter, which directly affects the costs. This paper discusses the inherent redundancy of a modular multilevel converter (MMC) based static synchronous compensator (STATCOM) operating in the overmodulation region. Analytical expressions for the limits of the converter linear region were developed in order to define the minimum required dc-link voltage. Moreover, sensitivity analyses were implemented in order to show the effects of grid voltage variations, different output impedances, power factor and injected currents. The results indicated that the operation in overmodulation region has significant inherent redundancy. For a MMC based STATCOM with 26 cells, the converter can ride through 4 failures per arm without significantly increasing the output THD or reducing the injected current into the grid.

Originalsprog	Engelsk
Artikelnummer	8809215
Tidsskrift	IEEE Transactions on Power Delivery
Vol/bind	35
Udgave nummer	3
Sider (fra-til)	1169-1179
Antal sider	11
ISSN	0885-8977
DOI	https://doi.org/10.1109/TPWRD.2019.2936784
Status	Udgivet - jun. 2020

Bibliografisk note

Funding Information:
Manuscript received January 7, 2019; revised May 3, 2019 and July 1, 2019; accepted August 9, 2019. Date of publication August 21, 2019; date of current version May 21, 2020. This work was supported in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001, in part by CNPq, and in part by FAPEMIG. Paper no. TPWRD-01513-2018. (Corresponding author: Allan Fagner Cupertino.) A. F. Cupertino is with the Graduate Program in Electrical Engineering, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil, and also with the Department of Materials Engineering, Federal Center for Technological Education of Minas Gerais, Belo Horizonte 30421-169, Brazil (e-mail: [email protected]).

Publisher Copyright:
© 2019 IEEE.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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10.1109/TPWRD.2019.2936784

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title = "On Inherent Redundancy of MMC-Based STATCOMs in the Overmodulation Region",

abstract = "Modular multilevel converters (MMCs) are frequently featured to their modular structure, which results in fault-tolerant operation and easy redundancy realization. Nevertheless, in order to reach a given redundancy factor, more cells must be included in the converter, which directly affects the costs. This paper discusses the inherent redundancy of a modular multilevel converter (MMC) based static synchronous compensator (STATCOM) operating in the overmodulation region. Analytical expressions for the limits of the converter linear region were developed in order to define the minimum required dc-link voltage. Moreover, sensitivity analyses were implemented in order to show the effects of grid voltage variations, different output impedances, power factor and injected currents. The results indicated that the operation in overmodulation region has significant inherent redundancy. For a MMC based STATCOM with 26 cells, the converter can ride through 4 failures per arm without significantly increasing the output THD or reducing the injected current into the grid.",

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On Inherent Redundancy of MMC-Based STATCOMs in the Overmodulation Region

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