Harmonic Overvoltage Analysis of Electric Railways in a Wide Frequency Range Based on Relative Frequency Relationships of the Vehicle–Grid Coupling System

Qiujiang Liu, Binghan Sun, Qinyao Yang, Mingli Wu and Tingting He
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Qiujiang Liu: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Binghan Sun: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Qinyao Yang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Mingli Wu: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Tingting He: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2020, vol. 13, issue 24, 1-16

Abstract: Harmonic overvoltage in electric railway traction networks can pose a serious threat to the safe and stable operation of the traction power supply system (TPSS). Existing studies aim at improving the control damping of grid-connected converters, neglecting the impedance frequency characteristics (IFCs) of the actual TPSS. The applicable frequency range of these studies is relatively low, usually no more than half of the switching frequency, and there is a large gap with the actual traction network harmonic overvoltage frequency range of 750 Hz–3750 Hz. In this paper, first, the IFCs of the actual TPSS in the wide frequency range of 150 Hz–5000 Hz are obtained through field tests, and the resonant frequency distribution characteristics of TPSS are analyzed. After that, the aliasing effect of the sampling process and the sideband effect of the modulation process of the digital control of the grid-connected converter are considered. Based on the relative relationships among the inherent resonant frequency of the TPSS, sampling frequency and switching frequency, an impedance matching analysis method is proposed for the wide frequency range of the vehicle–grid coupling system. By this method, the sampling frequency and switching frequency can be decoupled, and the harmonic overvoltage of traction network in the frequency range of two times switching frequency and above can be directly estimated. Finally, the method proposed in this paper is validated by the comparative simulation analysis of seven different cases.

Keywords: electric railway; harmonic resonance; harmonic overvoltage; stability analysis; resonant frequency; traction power supply system (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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