Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Neutral section passing strategy preventing inrush current for electric railway solid-state transformers

  • Bu, Hanyoung (Department of Electrical and Electronic Engineering, Konkuk University) ;
  • Lee, Yejun (Department of Electrical and Electronic Engineering, Konkuk University) ;
  • Cho, Younghoon (Department of Electrical and Electronic Engineering, Konkuk University) ;
  • Kim, Myung-Yong (Korea Railroad Research Institute) ;
  • Lee, Eunsoo (Korea Railroad Research Institute) ;
  • Park, Jin-Hyuk (Korea Railroad Research Institute)
  • Received : 2020.11.14
  • Accepted : 2021.04.28
  • Published : 2021.08.20
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Abstract

This paper proposes a neutral section passing strategy for preventing the inrush current of an electric railway vehicle (ERV) with a solid-state transformer (SST). This inrush current is not generated when the ERV passes the neutral section by maintaining a dc-link voltage at a constant level that is higher than the peak voltage of an electric railway feeder using regenerative energy from the ERV. Depending on the position of the ERV, the control strategies and modes are changed. When the ERV passes the neutral section, the regenerative energy from the ERV charges the dc-link voltage. A dc-ac converter that operates a traction motor takes charge of the dc-link voltage control in the regeneration operation. Simulation results show that the proposed strategy can protect the SST from inrush current when the ERV passes the neutral section. Experiments have been carried out with a scaled-down prototype. Experimental results verify the performance of the proposed neutral section passing strategy.

Keywords

Acknowledgement

This work was supported by a Grant (20RTRP-B146050-03) from the Railroad Technology Development Program funded by the Ministry of Land, Infrastructure and Transport (MOLIT) of Korean Government. This paper was supported by Konkuk University Researcher Fund in 2019.

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