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Title: Decoupled discontinuous modulation for cascaded H-bridge StatCom with star configuration
Authors: Liu, Qingxiang
Rodriguez, Ezequiel
Farivar, Glen G.
Pou, Josep
Townsend, Christopher D.
Leyva, Ramon
Keywords: Engineering::Electrical and electronic engineering
Engineering::Electrical and electronic engineering::Power electronics
Issue Date: 2022
Source: Liu, Q., Rodriguez, E., Farivar, G. G., Pou, J., Townsend, C. D. & Leyva, R. (2022). Decoupled discontinuous modulation for cascaded H-bridge StatCom with star configuration. IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society.
Project: DERMS 
Conference: IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society
Abstract: This paper presents a novel zero-sequence voltage injection method for discontinuous modulation (DM) in star-connected cascaded H-bridge (CHB) static compensators (StatComs). Conventional DM methods in CHB StatComs suffer from control interactions during unbalanced grid conditions. This paper proposes a DM that eliminates this control interaction by inserting a clamping transition within a third of the fundamental period. The transition instant is decided by comparing a duty cycle, which is calculated to mitigate the fundamental-frequency in the zero-sequence voltage for discontinuous operation, with a triangular carrier signal with a frequency of three times the fundamental. The clamping intervals under the proposed DM are affected by the phase-shift of this carrier. Specifically, the paper analyses the effects on the harmonic content of the proposed zero-sequence voltage, switching loss, twice-fundamental-frequency capacitor voltage ripple, and current total harmonic distortion, for different phase-shift angles of the DM carrier signal. Besides, the feasibility of the proposed DM in dealing with a grid voltage sag is also discussed.
ISBN: 978-1-6654-8025-3
ISSN: 2577-1647
DOI: 10.1109/IECON49645.2022.9969065
Schools: Interdisciplinary Graduate School (IGS) 
School of Electrical and Electronic Engineering 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2022 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 Conference Papers
ERI@N Conference Papers
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