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

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

Research output: Contribution to journalJournal articleResearchpeer-review

38 Citations (Scopus)


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
JournalI E E E Transactions on Industrial Electronics
Issue number5
Pages (from-to)2663 - 2672
Number of pages10
Publication statusPublished - May 2015


  • Active-clamped
  • Capacitor voltage balance
  • Diode-clamped
  • Multilevel
  • Pulsewidth modulation
  • Pulsewidth modulation (PWM)
  • Virtual vector


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