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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

38 Citationer (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.
TidsskriftI E E E Transactions on Industrial Electronics
Udgave nummer5
Sider (fra-til)2663 - 2672
Antal sider10
StatusUdgivet - maj 2015


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