A Novel Solid-State Transformer With Loosely Coupled Resonant Dual-Active-Bridge Converters
| Autor: | Myung Yong Kim, Junghyeon Roh, Sungmin Kim, Seunghwan Lee, Jaehong Lee, Seung-Hyuk Baek |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
business.industry Electrical engineering Input impedance Converters Grid Network topology Industrial and Manufacturing Engineering law.invention Power (physics) Control and Systems Engineering law Maximum power transfer theorem Electrical and Electronic Engineering Transformer business Air gap (plumbing) |
| Zdroj: | IEEE Transactions on Industry Applications. 58:709-719 |
| ISSN: | 1939-9367 0093-9994 |
| Popis: | Solid-state transformers (SSTs) utilize 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 a key component of SSTs. This study proposes a novel SST with loosely coupled resonant DABs (LCR-DAB) utilizing loosely coupled inductive power transfer (IPT) coils instead of high-frequency (HF) transformers. Unlike HF transformers, the large air gap between the primary and secondary coils enables easier packaging and high-voltage insulation of the proposed LCR-SST system. Seriesseries (SS) compensated symmetric resonant tanks are selected for the proposed IPT system. The impacts of the phase-shift angle and the circuit parameters on the input impedance, efficiency, and power transfer direction of the proposed LCR-DAB are investigated. By performing theoretical analyses, a circuit parameter design method for LCR-DAB is proposed. In addition, a new design approach for low-loss coils of LCR-DAB is investigated using finite-element analysis results. The proposed LCR-DAB and SST topologies are evaluated using the experimental results. The coil-to-coil and DC-to-DC efficiencies of a single LCR-DAB were 97.4% and 96.7%, respectively, over an air gap of 3 cm. The DC-to-DC efficiency of the 3-level LCR-SST was 95.2% at 2.4 kW. |
| Databáze: | OpenAIRE |
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