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Energies 2018, 11(1), 201; https://doi.org/10.3390/en11010201

Design and Control of a 13.2 kV/10 kVA Single-Phase Solid-State-Transformer with 1.7 kV SiC Devices

1
Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea
2
Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju 27469, Korea
*
Author to whom correspondence should be addressed.
Received: 8 December 2017 / Revised: 11 January 2018 / Accepted: 12 January 2018 / Published: 15 January 2018
(This article belongs to the Section Electrical Power and Energy System)

Abstract

This paper describes the power stage design, control, and performance evaluation of a 13.2 kV/10 kVA solid-state-transformer (SST) for a power distribution system. The proposed SST consists of 10 modules where each individual module contains a unidirectional three-level power factor correction (PFC) converter for the active-front-end (AFE) stage and an LLC resonant converter for the isolated DC-DC stage. The operating principles of the converters are analyzed and the modulation and the control schemes for the entire module are described in detail. The DC-link voltage imbalance is also less than other SST topologies due to the low number of uncontrollable switching states. In order to simplify the control of the power stage, a modulation strategy for the AFE stage is proposed, and the modulation frequency of the LLC converter is also fixed. In addition, a compensation algorithm is suggested to eliminate the current measurement offset in the AFE stage. The proposed SST achieves the unity power factor at the input AC current regardless of the reactive or nonlinear load and a low voltage regulation at the AC output. In order to verify the effectiveness of the SST, the 13.2 kV/10 kV SST prototype is built and tested. Both the simulation and the experimental results under actual 13.2 kV line show the excellent performance of the proposed SST scheme. View Full-Text
Keywords: solid-state-transformer (SST); three-level power factor correction (PFC) converter; LLC converter; multi-level converter solid-state-transformer (SST); three-level power factor correction (PFC) converter; LLC converter; multi-level converter
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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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Lim, J.-W.; Cho, Y.; Lee, H.-S.; Cho, K.-Y. Design and Control of a 13.2 kV/10 kVA Single-Phase Solid-State-Transformer with 1.7 kV SiC Devices. Energies 2018, 11, 201.

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