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Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/34501

Title: Operation of modular multilevel converters under voltage constraints
Author(s): López Medina, Mario
Briz del Blanco, Fernando
Zapico Ania, Alberto
Díaz Reigosa, David
Guerrero Muñoz, Juan Manuel
Issue date: 2015
Publisher: IEEE
Publisher version: http://dx.doi.org/10.1109/ECCE.2015.7310162
Format extent: p. 3550-3556
Abstract: MMCs are normally designed to operate in the linear region of the PWM. This limits the peak-to-peak phase voltage in the AC port to be lower than the DC port voltage. It is possible to increase the AC voltage beyond this limit by the use of overmodulation strategies. However, this is at the price of an increase in the harmonic content (THD) of the voltages and currents, and consequently, of a decrease of the power quality. While this type of operation is not desired in normal conditions, there are exceptional circumstances in which the MMC could be forced to operate in this mode. These would include transient anomalies, e.g. a temporary decrease of the DC port voltage or a temporary increase of the AC port voltage, or quasi-permanent conditions, e.g. the failure (and subsequent disconnection) of one or more cells in one or more arms of the MMC. Under this circumstances, the voltage margin between the DC and the AC port voltages required for the normal operation of the MMC might be lost. Consequently, the MMC should operate in the overmodulation region, or turned-off otherwise. This paper addresses the use of overmodulation techniques in MMC under voltage constraints. Under these circumstances, the MMC control should guarantee stable operation, (i.e. a controlled power transfer between the DC and AC ports with the cell voltages maintained at their target values) and minimize the distortion of the currents, and consequently the adverse effect on the power quality
URI: http://hdl.handle.net/10651/34501
ISBN: 978-1-4673-7151-3
Sponsored: This work was supported in part by the Research, Technological Development and Innovation Programs of the Spanish Ministries of Science and Innovation and of Economy and Competitiveness, under grants MICINN- 10-CSD2009-00046 and MINECO-13-ENE2013-48727-C2-1-R, and by the European Commission FP7 Large Project NMP3-LA-2013-604057, under grant UE-14-SPEED-604057
Project id.: MEC/MICINN- 10-CSD2009-00046
MEC/MINECO-13-ENE2013-48727-C2-1-R
EC/FP7/Large Project NMP3-LA-2013-604057, under grant UE-14-SPEED-604057
Appears in Collections:Capítulos de libros
Ingeniería Eléctrica, Electrónica, de Computadores y Sistemas
Investigaciones y Documentos OpenAIRE

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