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T-Type Direct AC/AC Converter Structure

Khodabandeh, M.; Zolghadri, M.R.; Shahbazi, M.; Noroozi, N.

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M. Khodabandeh

M.R. Zolghadri

N. Noroozi


In this study, a novel T-type topology for single-phase direct AC/AC conversion is proposed. In this topology, frequency changing takes place directly (without common DC voltage bus) through three converters that are connected in a T structure. Unity input power factor and precise output voltage and frequency regulation is achieved through appropriate control of these three converters. H-bridge converters can be used in each branch of T to make the proposed converter. The converter is controlled such that the average active power of each H-bridge remains zero. Therefore, capacitors are implemented in DC links of H-bridges. Moreover, using half-bridge converters, instead of H-bridge ones, for T branch converters, leads to an AC/AC converter with only six semiconductor switches. Also, multilevel inverters, specially cascaded H-bridge can be used in branches of T. This will lead to a multilevel AC/AC converter that is suitable for high-power applications such as intertie connections and high-power motor drives. Principle of operation and control schemes of the converter are then explained. Simulation and experimental results verify the performance of the converter while operating as a power supply at different frequencies.


Khodabandeh, M., Zolghadri, M., Shahbazi, M., & Noroozi, N. (2016). T-Type Direct AC/AC Converter Structure. IET Power Electronics, 9(7), 1426-1436.

Journal Article Type Article
Acceptance Date Feb 21, 2016
Online Publication Date Mar 4, 2016
Publication Date Jun 8, 2016
Deposit Date Apr 26, 2016
Publicly Available Date Apr 26, 2016
Journal IET Power Electronics
Print ISSN 1755-4535
Electronic ISSN 1755-4543
Publisher Institution of Engineering and Technology (IET)
Peer Reviewed Peer Reviewed
Volume 9
Issue 7
Pages 1426-1436


Accepted Journal Article (1.5 Mb)

Copyright Statement
This paper is a postprint of a paper submitted to and accepted for publication in IET Power Electronics and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.

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