Impedance Measurement of Traction Network and Electric Train for Stability Analysis in High-Speed Railways

Pengyu Pan, Haitao Hu*, Xiaowei Yang, Frede Blaabjerg, Xiongfei Wang, Zhengyou He

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

55 Citations (Scopus)
424 Downloads (Pure)

Abstract

Instability and oscillation issues have frequently occurred in high-speed railways due to the impedance mismatch versus frequency between the four-quadrant converter (4QC)-based high-speed train and the traction network (hereinafter train-network). However, solely utilizing the mathematical deduction to quantify the impedances seems to be difficult owing to unknown detailed parameters of both traction network and electric train. This paper proposes a method to measure the equivalent impedances of the traction network and the 4QC of the electric train in the stationary frame for stability analysis. A disturbance circuit consisting of antiparallel insulated gate bipolar transistor (IGBT) modules and an excitation load is adopted by means of the pulsewidth modulation (PWM) signal to drive the IGBTs. Consequently, a desired broad spectral excitation is then generated to measure the output impedance of the traction network. When injecting the harmonics twice, which are linearly independent at the same frequency, the input impedance of the 4QC can be calculated at the corresponding frequency considering the frequency-coupled effect. The proposed method shows a good measurement accuracy. Additionally, the stability and oscillation issues of the train-network system can be then identified using measured impedances. Both simulation and experimental results validate the effectiveness of the proposed measurement method.
Original languageEnglish
Article number8359306
JournalIEEE Transactions on Power Electronics
Volume33
Issue number12
Pages (from-to)10086-10100
Number of pages15
ISSN0885-8993
DOIs
Publication statusPublished - Dec 2018

Keywords

  • Electric train
  • four-quadrant converter (4QC)
  • high-speed railway
  • impedance measurement
  • low-frequency oscillation

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