Sun, J.; Zhang, K.; Liu, J.; Hu, K.; Huo, J.; Yan, S.; Zhang, Y. Mechanism of Low-Frequency Oscillation When Electric Multiple Units Pass Neutral Zone, and Suppression Method. Energies2023, 16, 5848.
Sun, J.; Zhang, K.; Liu, J.; Hu, K.; Huo, J.; Yan, S.; Zhang, Y. Mechanism of Low-Frequency Oscillation When Electric Multiple Units Pass Neutral Zone, and Suppression Method. Energies 2023, 16, 5848.
Sun, J.; Zhang, K.; Liu, J.; Hu, K.; Huo, J.; Yan, S.; Zhang, Y. Mechanism of Low-Frequency Oscillation When Electric Multiple Units Pass Neutral Zone, and Suppression Method. Energies2023, 16, 5848.
Sun, J.; Zhang, K.; Liu, J.; Hu, K.; Huo, J.; Yan, S.; Zhang, Y. Mechanism of Low-Frequency Oscillation When Electric Multiple Units Pass Neutral Zone, and Suppression Method. Energies 2023, 16, 5848.
Abstract
This article addresses the problem of contact voltage increase caused by the low frequency oscillation of the train-grid system in the phase-separation process of the EMU. The article establishes the EMU-contact line-traction substation model, reveals the mechanism of low-frequency oscillation, and obtains the relationship between the separation phase angle of the pantograph with line and low-frequency oscillations. Methods to suppress the over-voltage during the low-frequency oscillation are proposed. The study shows that when the power phase angle of the pantograph-line separation is within the range of 60°~90° and 240°~270°, the voltage amplitude in the neutral zone is larger, the maximum amplitude can reach 52.2kV, and low-frequency oscillation will occur in the neutral zone. When low frequency oscillation occurs, the contact line voltage in the neutral zone is mainly 1/3 power frequency (16.7Hz). After installing an RC suppression device in the neutral zone, when the EMU enters the neutral zone, the absolute value of the voltage peak drops to below 20 kV. Compared with the situation where the suppression device is not connected, the absolute value of the voltage peak is reduced by nearly 60%. The study provides a basis for the design of the neutral zone of the contact line and the selection of the high-voltage equipment of the EMU.
Keywords
inrush current; high-speed train; over voltage; traction power supply system; vehicle
Subject
Engineering, Electrical and Electronic Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
