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Title: Discontinuous modulation of a cascaded H-bridge low-capacitance statcom
Authors: Liu, Qingxiang
Rodriguez, Ezequiel
Farivar, Glen G.
Ceballos, Salvador
Townsend, Christopher D.
Leyva, Ramon
Pou, Josep 
Keywords: Engineering::Electrical and electronic engineering::Power electronics
Issue Date: 2021
Source: Liu, Q., Rodriguez, E., Farivar, G. G., Ceballos, S., Townsend, C. D., Leyva, R. & Pou, J. (2021). Discontinuous modulation of a cascaded H-bridge low-capacitance statcom. IEEE Transactions On Power Electronics, 37(3), 2790-2800.
Journal: IEEE Transactions on Power Electronics 
Abstract: This paper presents a discontinuous modulation (DM) strategy for static compensators (StatComs) based on a cascaded H-bridge (CHB) converter with star configuration. The proposed DM strategy considers the capacitor voltage oscillations at twice the fundamental frequency and the effect of zero-sequence voltage injection on the capacitor voltages. Considering these effects is especially important in CHB-StatComs with large capacitor voltage ripples (low capacitance StatComs), where the assumption of a constant dc-link voltage, which is the basis of conventional DM strategies, does not apply. The paper also describes a coherent set of steady-state waveforms for CHB-StatComs under DM. In addition to the well-known benefit of reducing the switching losses, the proposed DM also reduces the dc-link capacitors size and extends the operating range. The viability of the proposed DM strategy is verified experimentally on a small-scale prototype. In addition, simulation results are obtained using a real-scale system to study feasibility of the DM under unbalanced conditions.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2021.3114976
Rights: © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
ERI@N Journal Articles
IGS Journal Articles

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