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Mechanism of Low-Frequency Oscillation When Electric Multiple Units Pass Neutral Zone, and Suppression Method

Author

Listed:
  • Jixing Sun

    (School of Electrical Engineering, Beijing Jiaotong University, No. 3 Shangyuancun in Haidian District, Beijing 100044, China)

  • Kun Zhang

    (School of Electrical Engineering, Beijing Jiaotong University, No. 3 Shangyuancun in Haidian District, Beijing 100044, China)

  • Jiyong Liu

    (School of Electrical Engineering, Beijing Jiaotong University, No. 3 Shangyuancun in Haidian District, Beijing 100044, China
    Shuohuang Railway Development Co., Ltd. of National Energy, Cangzhou 062350, China)

  • Kaixuan Hu

    (School of Electrical Engineering, Beijing Jiaotong University, No. 3 Shangyuancun in Haidian District, Beijing 100044, China)

  • Jindong Huo

    (Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA)

  • Shengchun Yan

    (Shuohuang Railway Development Co., Ltd. of National Energy, Cangzhou 062350, China)

  • Yan Zhang

    (Shuohuang Railway Development Co., Ltd. of National Energy, Cangzhou 062350, China)

Abstract

This article addresses the problem of the contact voltage increase caused by the low-frequency oscillation of the train-grid system in the phase-separation process of EMUs. The article establishes the EMU-contact line-traction substation model, reveals the mechanism of low-frequency oscillation, and ascertains the relationship between the phase angle when the pantograph leaves the line, and low-frequency oscillations. Methods to suppress overvoltage during the low-frequency oscillation are proposed. The research indicated that a significant voltage amplitude was observed in the neutral zone, when the phase angle of the pantograph to the contact line separation power supply fell within the range of 60–90° and 240–270°. The maximum voltage amplitude reached 69.75 kV, and there was an occurrence of low-frequency oscillation in the neutral zone, where electrical phase separation takes place. During this oscillation, the voltage of the contact network in the neutral zone mainly operated at one-third of the power frequency (16.7 Hz). However, after installing an RC suppression device in the neutral zone, when low-frequency oscillation occurred, the absolute value of the peak voltage dropped below 37 kV as soon as the EMU entered electric phase separation. Furthermore, compared to situations without a connected suppression device, there was nearly a 30% reduction in the absolute value of the peak voltage. The study provides a basis for the design of the neutral zone of the contact line, and the selection of high-voltage equipment for the EMU.

Suggested Citation

  • Jixing Sun & Kun Zhang & Jiyong Liu & Kaixuan Hu & Jindong Huo & Shengchun Yan & Yan Zhang, 2023. "Mechanism of Low-Frequency Oscillation When Electric Multiple Units Pass Neutral Zone, and Suppression Method," Energies, MDPI, vol. 16(15), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5848-:d:1212309
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    References listed on IDEAS

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    1. Casoria, Silvano & Sybille, Gilbert & Brunelle, Patrice, 2003. "Hysteresis modeling in the MATLAB/Power System Blockset," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 63(3), pages 237-248.
    2. Yu, Xiaodong & Zhang, Jian & Fan, Chengyu & Chen, Sheng, 2016. "Stability analysis of governor-turbine-hydraulic system by state space method and graph theory," Energy, Elsevier, vol. 114(C), pages 613-622.
    3. Jixing Sun & Kaixuan Hu & Yongzhi Fan & Jiyong Liu & Shengchun Yan & Yan Zhang, 2022. "Modeling and Experimental Analysis of Overvoltage and Inrush Current Characteristics of the Electric Rail Traction Power Supply System," Energies, MDPI, vol. 15(24), pages 1-21, December.
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