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

The Korean Institute of Power Electronics (전력전자학회)
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Secondary Indirect Constant Voltage Control Technique for Hybrid Solid State Transformer using Primary Side Information

하이브리드 반도체 변압기의 1차측 정보를 이용한 2차측 간접 정전압 제어 기법

  • Lee, Taeyeong (Dept. of Electrical and Electronic Eng., Konkuk University) ;
  • Yun, Chun-Gi (Dept. of Electrical and Electronic Eng., Konkuk University) ;
  • Cho, Younghoon (Dept. of Electrical and Electronic Eng., Konkuk University)
  • Received : 2020.04.14
  • Accepted : 2020.05.12
  • Published : 2020.10.20
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Abstract

This study proposes an indirect constant voltage control algorithm for hybrid solid-state transformers (HSSTs) by using primary side information. Considering the structure of HSSTs, measuring voltage and current information on the primary side of a transformer is necessary to control the converter and inverter of the power converter. The secondary side output voltage is measured to apply the conventional secondary side constant voltage control algorithm, and thus, the digital control board requires the same rated insulation voltage as that of the transformer. To solve this problem, the secondary voltage of the transformer obtained from the tap voltage is used. Moreover, output voltage decreases as load increases because the proposed indirect constant voltage control scheme does not consider the cable impedance between the secondary output terminal and the load. This study also proposes a technique for compensating the secondary output voltage by using the primary current of the transformer and the resistance value of the cable. An experiment is conducted using a scale-down HSST prototype consisting of a 660 V/220 V tap transformer. The problem of the proposed indirect constant voltage control strategy and the improvement effect due to the application of the compensation method are compared using the derived experimental results.

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References

  1. X. She, X. Yu, F. Wang, and A. Q. Huang, "Design and demonstration of a 3.6-kV.120-V/10-kVA solid-state transformer for smart grid application," IEEE Trans. Power Electron., Vol. 29, pp. 3982-3996, 2014. https://doi.org/10.1109/TPEL.2013.2293471
  2. X. She, A. Q. Huang, and R. Burgos, "Review of solid-state transformer technologies and their application in power distribution systems," IEEE J. Emerg. Sel. Top. Power Electron., Vol. 1, pp. 186-198, 2013. https://doi.org/10.1109/JESTPE.2013.2277917
  3. J. Shi et al., "Research on voltage and power balance control for cascaded modular solid-state transformer," IEEE Trans. Power Electron., Vol. 26, pp. 1154-1166. 2011. https://doi.org/10.1109/TPEL.2011.2106803
  4. J. Liu et al., "Voltage balance control based on dual active bridge DC/DC converters in a power electronic traction transformer," IEEE Trans. Power Electron., Vol. 33, pp. 1696-1714, 2018. https://doi.org/10.1109/TPEL.2017.2679489
  5. A. Q. Huang et al., "15 kV SiC MOSFET: An enabling technology for medium voltage solid state transformers CPSS," Trans. Power Electron. Appl., Vol. 2, pp. 118-130. 2017.
  6. D. Das et al., "Power flow control in networks using controllable network transformers," IEEE Trans. Power Electron., Vol. 25, pp. 1753-1760, 2010. https://doi.org/10.1109/TPEL.2010.2042076
  7. C. G. Yun and Y. Cho, "Active hybrid solid state transformer based on multi-level converter using SiC MOSFET," Energies, Vol. 12, No. 1, 2019.