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

The Korean Institute of Power Electronics (전력전자학회)
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Experience and Analysis of Pole Interaction for Jeju HVDC No. 2: Practical Solution for Non-Interruptible Power Transfer

제주 HVDC No. 2의 극간 상호작용 경험과 분석: 무정전 전력 송전을 위한 실용적 해결방안

  • Kim, Hee-Jin (Dept. of Electrical and Electronic Eng., Yonsei University) ;
  • Kim, Chan-Ki (Power Transmission Laboratory, KEPCO Research Institute) ;
  • Park, Chang-Hwan (Dept. of Electrical Eng., Pusan National University)
  • Received : 2020.03.20
  • Accepted : 2020.06.28
  • Published : 2020.12.20
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Abstract

The pole interaction of the line-commutated converter high-voltage direct current (HVDC) is analyzed, and a practical solution that uses a surge arrester is proposed. Jeju HVDC No. 2 is a double-monopole HVDC link that has a rated power capacity of 2 × 200 MW and was commissioned in 2012. During normal operation, Jeju HVDC No. 2 is operated in the bipolar mode to minimize the loss caused by the dedicated metallic return. However, when one pole of the inverter valve is bypassed, a commutation failure can occur in the other pole. This phenomenon is called pole interaction in this work. This pole interaction interrupts the HVDC power transfer for almost 2 s and may affect the stability of the power system. This research proposes the installation of a surge arrester at the inverter neutral, which can be an effective and practical solution for pole interaction. The HVDC system is analyzed, and the residual voltage of the surge arrester is determined. Detailed simulation using PSCAD/EMTDC demonstrates that the proposed method eliminates the pole interaction of the bipolar-operated HVDC.

Keywords

Acknowledgement

This work was supported by BK21PLUS, Creative Human Resource Education and Research Programs for ICT Convergence in the 4th Industrial Revolution.

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