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

Jixing Sun (), Kun Zhang, Jiyong Liu, Kaixuan Hu, Jindong Huo, Shengchun Yan and Yan Zhang
Additional contact information
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
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

Energies, 2023, vol. 16, issue 15, 1-15

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.

Keywords: inrush current; high-speed train; over voltage; traction power-supply system; vehicle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/15/5848/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/15/5848/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:15:p:5848-:d:1212309

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().