전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제26권6호
  • /
  • Pages.437-445
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  • 2021
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  • 1229-2214(pISSN)
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  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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Loosely Coupled Resonant DAB 컨버터의 안정적인 초기 구동을 위한 동작 주파수 설계

Operating Frequency Design for Stable Initial Operation of Loosely Coupled Resonant DAB Converter

  • Baek, Seung-Hyuk (Div. of Electrical Engineering, Hanyang University, ERICA Campus) ;
  • Kim, Sungmin (Div. of Electrical Engineering, Hanyang University, ERICA Campus) ;
  • Lee, Jaehong (School of Electrical and Computer Engineering, University of Seoul) ;
  • Lee, Seung-Hwan (School of Electrical and Computer Engineering, University of Seoul)
  • 투고 : 2021.08.25
  • 심사 : 2021.10.01
  • 발행 : 2021.12.31
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초록

This paper proposes an operating frequency design method that limits the voltage applied to aload-side converter during the initial operation of a loosely coupled resonant dual-active bridge (LCR-DAB) converter and an initial operating strategy that applies it. The LCR-DAB converter uses two wireless power transfer coils instead of the high-frequency transformer of the general DAB converter. The wireless power coil has a physical distance of several tens of millimeter or more between the two coils; thus, the LCR-DAB converter is a bidirectional isolated power conversion system that can easily achieve high insulation performance. However, for the initial operation of the LCR-DAB, if the power-side converter is operated at the resonance frequency while the load-side converter is not operating, then a very high voltage due to resonance is applied to the load-side converter, thereby causing damage to the converter. Therefore, a method that can stably charge the DC link voltage of the secondary-side converter during the initial operation is needed. This paper proposes a method to initially charge the secondary-side DC link by operating the primary-side converter at a frequency with limited voltage gain rather than at a steady-state operating frequency. The validity of the proposed frequency design method and initial operating sequence is verified through simulation and experimentation of the 1 KW LCR-DAB converter.

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과제정보

본 논문은 2021년도 산업통상자원부의 재원으로 한국에너지기술평가원의 지원을 받아 수행된 연구 과제입니다. (No. 20193010025790)

참고문헌

  1. X. She, A. Q. Huang, and R. Burgos, "Review of solid-state transformer technologies and their application in power distribution systems," IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 1, No. 3, pp. 186-198, Sep. 2013. https://doi.org/10.1109/JESTPE.2013.2277917
  2. B. Zhao, Q. Song, W. Liu, and Y. Sun, "Overview of dual-active-bridge isolated bidirectional DC-DC converter for high-frequency-link power-conversion system," IEEE Transactions on Power Electronics, Vol. 29, No. 8, pp. 4091-4106, Aug. 2014. https://doi.org/10.1109/TPEL.2013.2289913
  3. R. P. Londero, A. P. C. de Mello, and G. S. da Silva, "Comparison between conventional and solid state transformers in smart distribution grids," in 2019 IEEE PES Innovative Smart Grid Technologies Conference-Latin America (ISGT Latin America), pp. 1-6, Sep. 2019.
  4. A. Joshi and S. Nath, "Efficiency comparison of solid-state transformer and low-frequency power transformer," in 2020 3rd International Conference on Energy, Power and Environment: Towards Clean Energy Technologies, pp. 1-6, Mar. 2021.
  5. J. E. Huber and J. W. Kolar, "Volume/weight/cost comparison of a 1MVA 10 kV/400 V solid-state against a conventional low-frequency distribution transformer," in 2014 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 4545-4552, Sep. 2014.
  6. W. Zhang and C. C. Mi, "Compensation topologies of high-power wireless power transfer systems," IEEE Transactions on Vehicular Technology, Vol. 65, No. 6, pp. 4768-4778, Jun. 2016. https://doi.org/10.1109/TVT.2015.2454292
  7. J. Lee, J. Roh, S. H. Lee, S. Kim, and M. Y. Kim, "A novel solid-state transformer with loosely coupled resonant dual-active-bridge converters," in 2020 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 3972-3978, Oct. 2020.
  8. S. Cho, I. Lee, S. Moon, G. Moon, B. Kim, and K. Y. Kim, "Series-series compensated wireless power transfer at two different resonant frequencies," in 2013 IEEE ECCE Asia Downunder, pp. 1052-1058, Jun. 2013.