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Energies 2016, 9(9), 668; doi:10.3390/en9090668

Modularized Three-Phase Semiconductor Transformer with Bidirectional Power Flow for Medium Voltage Application

Department of Electrical Engineering, Myong-ji University, 116 Myongji-ro, Yongin-si, Gyeonggi-do 449-728, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 22 May 2016 / Revised: 29 July 2016 / Accepted: 17 August 2016 / Published: 23 August 2016
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Abstract

This paper describes a prototype of modularized three-phase semiconductor transformer that was developed in the lab for feasibility study. The developed prototype is composed of three units of single-phase semiconductor transformer coupled in Y-connection. Each single-phase unit has multiple units of high-voltage high-frequency resonant AC–DC converter, a low-voltage hybrid-switching DC–DC converter, and a low-voltage hybrid-switching DC–AC inverter. Also, each single-phase unit has two digital signal processor (DSP) boards to control converter operation and to acquire monitoring data. The monitoring system was developed based on LabView by using controller area network (CAN) communication between the DSP board and the personal computer (PC). Through diverse experimental analyses it was verified that the prototype operates with proper performance under normal and sag conditions. The developed prototype confirms the possibility of fabricating a commercial high-voltage high-power semiconductor transformer by increasing the number of series-connected converter modules in high-voltage side and improving the system efficiency with a new switching device such as an SiC device. View Full-Text
Keywords: modularized semiconductor transformer; high-frequency resonant AC–DC converter; hybrid-switching DC–DC converter; hybrid-switching DC–AC converter; digital signal processor (DSP) board; controller area network (CAN) communication; LabView modularized semiconductor transformer; high-frequency resonant AC–DC converter; hybrid-switching DC–DC converter; hybrid-switching DC–AC converter; digital signal processor (DSP) board; controller area network (CAN) communication; LabView
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, D.-H.; Han, B.-M.; Lee, J.-Y. Modularized Three-Phase Semiconductor Transformer with Bidirectional Power Flow for Medium Voltage Application. Energies 2016, 9, 668.

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