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Modeling and Analysis of Low-Frequency Oscillation for Electrified Railway under Mixed Operation of Passenger and Freight Trains

Author

Listed:
  • Yunling Wang

    (State Grid Sichuan Economic Research Institute, Chengdu 610041, China)

  • Ting Li

    (State Grid Sichuan Economic Research Institute, Chengdu 610041, China)

  • Jiawei Liu

    (State Grid Sichuan Economic Research Institute, Chengdu 610041, China)

  • Fang Liu

    (State Grid Sichuan Economic Research Institute, Chengdu 610041, China)

  • Yunche Su

    (State Grid Sichuan Economic Research Institute, Chengdu 610041, China)

  • Qiao Zhang

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610032, China)

  • Weilu Zhang

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610032, China)

  • Zhigang Liu

    (School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610032, China)

Abstract

Addressing the shortcomings of existing low-frequency oscillation research on electrified railways, which has mainly focused on single-type trains and lacks the accurate modeling of traction inverter systems, in this paper we modeled and analyzed low-frequency oscillations in an electrified railway passenger and freight mixed-operation vehicle–grid system. First, an equivalent model of the DC side of the traction inverter was established, with the inverter system being equivalent to the parallel connection of the load resistance and the current source, and the specific mathematical expression was determined and verified by impedance measurement. Secondly, based on the equivalent model of the DC side of the traction inverter, a small signal model of the vehicle–grid system under the mixed operating conditions of CRH5 and HXD 2B considering the inverter system was established. The generalized Nyqusit criterion was used to study the low-frequency oscillation characteristics under mixed transportation conditions. The accuracy of the established model and the correctness of the theoretical analysis were verified based on Matlab/Simulink. Finally, using the dominant pole theory to analyze the low-frequency stability conditions, the relationship between the number of mixed trains and the minimum short-circuit ratio was obtained, and the simulation verification was carried out.

Suggested Citation

  • Yunling Wang & Ting Li & Jiawei Liu & Fang Liu & Yunche Su & Qiao Zhang & Weilu Zhang & Zhigang Liu, 2022. "Modeling and Analysis of Low-Frequency Oscillation for Electrified Railway under Mixed Operation of Passenger and Freight Trains," Energies, MDPI, vol. 15(20), pages 1-20, October.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7544-:d:940976
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