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Energies 2016, 9(11), 867; doi:10.3390/en9110867

A Novel Modulation Function-Based Control of Modular Multilevel Converters for High Voltage Direct Current Transmission Systems

1
Young Researchers and Elite Club, Sari Branch, Islamic Azad University, Sari 47136, Iran
2
INESC-ID, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1, Lisbon 1049-001, Portugal
3
C-MAST, University of Beira Interior, R. Fonte do Lameiro, Covilhã 6201-001, Portugal
4
ABB Australia Pty Limited, Berrimah, Northern Territory 0828, Australia
5
Departamento de Ingeniería Eléctrica, Instituto Tecnológico de Orizaba (ITO), Orizaba, Veracruz 94320, Mexico
6
INESC TEC and Faculty of Engineering of the University of Porto, R. Dr. Roberto Frias, Porto 4200-465, Portugal
The authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Gianfranco Chicco
Received: 22 May 2016 / Revised: 16 October 2016 / Accepted: 17 October 2016 / Published: 25 October 2016
(This article belongs to the Special Issue Advances in Power System Operations and Planning)

Abstract

In this paper, a novel modulation function-based method including analyses of the modulation index and phase is proposed for operation of modular multilevel converters (MMCs) in high voltage direct current (HVDC) transmission systems. The proposed modulation function-based control technique is developed based on thorough and precise analyses of all MMC voltages and currents in the a-b-c reference frame in which the alternating current (AC)-side voltage is the first target to be obtained. Using the AC-side voltage, the combination of the MMC upper and lower arm voltages is achieved as the main structure of the proposed modulation function. The main contribution of this paper is to obtain two very simple new modulation functions to control MMC performance in different operating conditions. The features of the modulation function-based control technique are as follows: (1) this control technique is very simple and can be easily achieved in a-b-c reference frame without the need of using Park transformation; and (2) in addition, the inherent properties of the MMC model are considered in the proposed control technique. Considering these properties leads to constructing a control technique that is robust against MMC parameters changes and also is a very good tracking method for the components of MMC input currents. These features lead to improving the operation of MMC significantly, which can act as a rectifier in the HVDC structure. The simulation studies are conducted through MATLAB/SIMULINK software, and the results obtained verify the effectiveness of the proposed modulation function-based control technique. View Full-Text
Keywords: transmission systems; high voltage direct current (HVDC); power electronic converters; control; modulation function and index transmission systems; high voltage direct current (HVDC); power electronic converters; control; modulation function and index
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MDPI and ACS Style

Mehrasa, M.; Pouresmaeil, E.; Zabihi, S.; Trujillo Caballero, J.C.; Catalão, J.P.S. A Novel Modulation Function-Based Control of Modular Multilevel Converters for High Voltage Direct Current Transmission Systems. Energies 2016, 9, 867.

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