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T-type direct AC/AC converter structure

Khodabandeh, M ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1049/iet-pel.2015.0151
  3. Publisher: Institution of Engineering and Technology , 2016
  4. Abstract:
  5. 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. © The Institution of Engineering and Technology
  6. Keywords:
  8. Source: IET Power Electronics ; Volume 9, Issue 7 , 2016 , Pages 1426-1436 ; 17554535 (ISSN)
  9. URL: http://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0151