Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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VPI-based Control Strategy for a Transformerless MMC-HVDC System Under Unbalanced Grid Conditions

  • Kim, Si-Hwan (Dept. of Electrical Engineering, Hanyang University) ;
  • Kim, June-Sung (Dept. of Electrical Engineering, Hanyang University) ;
  • Kim, Rae-Young (Dept. of Electrical and Biomedical Engineering, Hanyang University) ;
  • Cho, Jin-Tae (Korea Electric Power Research Institute(KEPRI), Korea Electric Power, Corporation(KEPCO)) ;
  • Kim, Seok-Woong (Korea Electric Power Research Institute(KEPRI), Korea Electric Power, Corporation(KEPCO))
  • Received : 2017.10.11
  • Accepted : 2018.07.06
  • Published : 2018.11.01
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Abstract

This paper introduces a control method for a transformerless MMC-HVDC system. The proposed method can effectively control the grid currents of the MMC-HVDC system under unbalanced grid conditions such as a single line-to-ground fault. The proposed method controls the currents of the positive sequence component and the negative sequence component without separating algorithms. Therefore, complicated calculations for extracting the positive sequence and the negative sequence component are not required. In addition, a control method to regulate a zero sequence component current under unbalanced grid conditions in the transformerless MMC-HVDC system is also proposed. The validity of the proposed method is verified through PSCAD/EMTDC simulation.

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References

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