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Energies 2017, 10(1), 86; doi:10.3390/en10010086

New Approaches to Circulating Current Controllers for Modular Multilevel Converters

Electronics Department, University of Alcalá, Escuela Politécnica, 28805 Alcalá de Henares, Spain
Author to whom correspondence should be addressed.
Academic Editor: Paul Stewart
Received: 28 September 2016 / Revised: 22 December 2016 / Accepted: 4 January 2017 / Published: 13 January 2017
(This article belongs to the Special Issue Next-Generation Low-Carbon Power and Energy Systems)


In the next years, modular multilevel converters (MMCs) are going to be a next generation multilevel converters for medium to high voltage conversion applications, such as medium voltage motor drives, medium voltage flexible AC transmission systems (FACTS) and high voltage direct current transmission. They provide advantages such as high modularity, availability, low generation of harmonics, etc. However, the circulating current distorts the leg currents and increases the rated current of power devices, which further increases system cost. This paper focuses on analysis and suppression of these currents in a MMC using two algorithms for tracking of harmonics. For this work resonant controllers and repetitive controllers have been selected. Both controllers are analyzed and simulations results are presented. Moreover, the controllers have been tested and validated for a three phase MMC operating as an inverter using a real processing platform based on Zynq by Xilinx and designed to control large multilevel converters and in a real MMC prototype. These results are provided to demonstrate the feasibility of the proposed method. View Full-Text
Keywords: modular multilevel converter (MMC); circulating current; resonant controller; repetitive controller; power quality modular multilevel converter (MMC); circulating current; resonant controller; repetitive controller; power quality

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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

Moranchel, M.; Bueno, E.; Sanz, I.; Rodríguez, F.J. New Approaches to Circulating Current Controllers for Modular Multilevel Converters. Energies 2017, 10, 86.

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