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Highly reliable and efficient voltage optimizer based on direct PWM AC-AC buck converter

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Wang, Jianguo and McMahon, Richard A. (2020) Highly reliable and efficient voltage optimizer based on direct PWM AC-AC buck converter. IEEE Transactions on Energy Conversion . doi:10.1109/TEC.2020.2995669 (In Press)

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Official URL: http://dx.doi.org/10.1109/TEC.2020.2995669

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Abstract

A voltage optimizer (VO) to regulate overrated electricity supply voltages to optimized values with high reliability and efficiency has been developed based on a direct PWM ac-ac buck converter. A comprehensive control strategy is proposed for the ac-ac converter to address existing commutation problems and also to offer a fault handling capability against short circuits. A number of switching states are defined depending on the input voltage, whereby continuous and reliable current paths are maintained at all times especially around voltage zero-crossing points, and safe transitions between them are achieved as well. Based on a detailed power loss analysis, a hybrid scheme with silicon carbide (SiC) MOSFETs and silicon IGBTs is proposed which significantly improves the efficiency while minimizes the cost, and simultaneously enables the use of a high switching frequency, with the potential to reduce the volume of a VO. Results from simulation and experiment confirm that the proposed strategies give reliable operation of the VO with an efficiency higher than 99%.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): AC-to-AC converters, Silicon carbide, Power electronics, Short circuits, Electric apparatus and appliances -- Protection
Journal or Publication Title: IEEE Transactions on Energy Conversion
Publisher: IEEE
Official Date: 19 May 2020
Dates:
DateEvent
19 May 2020Published
13 May 2020Accepted
8 December 2019Submitted
Date of first compliant deposit: 28 May 2020
DOI: 10.1109/TEC.2020.2995669
Status: Peer Reviewed
Publication Status: In Press
Publisher Statement: © 2020 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.
Access rights to Published version: Restricted or Subscription Access

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