Enhanced DC-Link Capacitor Voltage Balancing Control of DC-AC Multilevel Multileg Converters
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Document typeArticle
Defense date2015-05-01
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
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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.
CitationBusquets-Monge, S. [et al.]. Enhanced DC-Link Capacitor Voltage Balancing Control of DC-AC Multilevel Multileg Converters. "IEEE transactions on industrial electronics", 01 Maig 2015, vol. 62, núm. 5, p. 2663-2672.
ISSN0278-0046
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