Influence of the Catenary Distributed Parameters on the Resonance Frequencies of Electric Railways Based on Quantitative Calculation and Field Tests

Abstract

High-order harmonic resonance is a key issue in the traction power supply systems (TPSS) of electric railways for safe operation. The effective evaluation of the resonance frequency is critical for taking measures to suppress harmonic resonance. In this paper, the influence of the distributed parameters of traction networks on resonance frequencies based on accurate calculation is proposed. The quantitative assessments of the distributed impedance and admittance are investigated. Furthermore, the theoretical calculation is directly verified using field tests at a high voltage level equal to 25 kV. The results show that the resonance frequencies of the TPSS are mainly affected by the distributed parameters, including the self-admittance and self-impedance of the contact wires, and the self-admittance of the positive feeders. In addition, the admittance connected in parallel has a greater effect than the series-connected impedance. The calculation method is also adapted to TPSS connected to renewable energy.

Review of Waveform Distortion Interactions Assessment in Railway Power Systems

“…The interaction between the public power system and the traction power supply system is modeled as a simple Thevenin-and Norton-equivalent interaction, respectively, assuming the distortion of the trains as a source for the disturbances in the public grid. Other examples of ERPS modeling for resonance and distortion studies can be found for the analysis of the harmonic sources [112], impedance identification [113,114], harmonic penetration to the local power supply of the traction substation [115], filter design [116], improved propagation studies [114][115][116], etc.…”