A Novel Solid-State Transformer with Loosely Coupled Resonant Dual-Active-Bridge Converters
- Authors
- Lee, Jaehong; Roh, Junghyeon; Lee, Seung hwan; Kim, Sungmin; Kim, Myung yong
- Issue Date
- Oct-2020
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- Coils; Power transformer insulation; Oil insulation; Impedance; Windings; Topology; Hafnium; Bidirectional wireless power transfer; dual-active-bridge (DAB) converter; inductive power transfer (IPT); solid-state transformer (SST)
- Citation
- 2020 IEEE Energy Conversion Congress and Exposition(ECCE 2020), pp 3972 - 3978
- Pages
- 7
- Indexed
- SCIE
SCOPUS
- Journal Title
- 2020 IEEE Energy Conversion Congress and Exposition(ECCE 2020)
- Start Page
- 3972
- End Page
- 3978
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/1497
- DOI
- 10.1109/ECCE44975.2020.9235810
- ISSN
- 2329-3748
2329-3721
- Abstract
- A solid-state transformer (SST) uses multiple isolated dual-active-bridge (DAB) converters to deliver power from a medium voltage AC or DC grid to low voltage DC or AC loads. The DAB converter is the key component of the SST. In this study, a new loosely coupled resonant DAB (LCR-DAB) that utilizes loosely coupled inductive power transfer (IPT) coils instead of the high frequency (HF) transformers of the conventional DABs is proposed. Unlike the HF transformers, a large air-gap between the primary and secondary coils enables easier packaging and high voltage insulation of the LCR-DAB. Series-series (SS) compensated symmetric resonant tanks are selected for the proposed IPT system. The dependences of the input impedance, efficiency, and power transfer direction of the proposed LCR-DAB on the phase-shift angle and the circuit parameters are investigated. Using the theoretical analysis, a circuit parameter design method for the LCR-DAB is proposed. Also, a new design approach for low-loss coils of the LCR-DAB are investigated using finite element analysis results. The proposed LCR-SST topology was evaluated using circuit simulation results. The simulated coil-to-coil efficiency of the LCR-DAB was 99 % over a 3-cm air-gap and the DC-to-DC efficiency of a 4-level LCR-SST was 94.5 %. © 2020 IEEE.
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