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

Jeong-Woo Lim, Younghoon Cho, Han-Sol Lee and Kwan-Yuhl Cho
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Jeong-Woo Lim: Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea
Younghoon Cho: Department of Electrical Engineering, Konkuk University, Seoul 05029, Korea
Han-Sol Lee: Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju 27469, Korea
Kwan-Yuhl Cho: Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju 27469, Korea

Energies, 2018, vol. 11, issue 1, 1-21

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.

Keywords: solid-state-transformer (SST); three-level power factor correction (PFC) converter; LLC converter; multi-level converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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