Enhanced DC-Link Capacitor Voltage Balancing Control of DC-AC Multilevel Multileg Converters

Sergio Busquets-Monge, Ramkrishan Maheshwari, Joan Nicolas-Apruzzese, Emili Lupon, Stig Munk-Nielsen, Josep Bordonau

Research output: Contribution to journalJournal article

Abstract

This paper presents a capacitor voltage balancing control applicable to any multilevel dc-ac converter formed by a single set of series-connected capacitors implementing the dc link and semiconductor devices, such as the diode-clamped topology. The control is defined for any number of dc-link voltage levels and converter legs (for single-phase and multiphase systems), guaranteeing the capacitor voltage control for any modulation index value and load (from idle mode to full power). The associated control loop small-signal transfer function is presented, from which optimum compensator design guidelines are derived. The improvement in control performance is verified through simulation and experiments comparing with a previous balancing control strategy in a four-level three-phase dc-ac conversion system. The satisfactory control performance is also verified through simulation in a four-level five-phase dc-ac conversion system.

Original languageEnglish
Article number6928423
JournalIEEE Transactions on Industrial Electronics
Volume62
Issue number5
Pages (from-to)2663-2672
Number of pages10
ISSN0278-0046
DOIs
Publication statusPublished - 1. May 2015

Keywords

  • Active-clamped
  • capacitor voltage balance
  • diode-clamped
  • multilevel
  • pulsewidth modulation
  • virtual vector

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    Busquets-Monge, S., Maheshwari, R., Nicolas-Apruzzese, J., Lupon, E., Munk-Nielsen, S., & Bordonau, J. (2015). Enhanced DC-Link Capacitor Voltage Balancing Control of DC-AC Multilevel Multileg Converters. IEEE Transactions on Industrial Electronics, 62(5), 2663-2672. [6928423]. https://doi.org/10.1109/TIE.2014.2363820