Suppression of Cable Overvoltage in a High-Speed Electric Multiple Units System

Lu, Hede; Zhu, Feng; Liu, Qingxiang; Li, Xin; Tang, Yiming; Qiu, Riqiang

doi:10.1109/temc.2018.2829510

Cited by 19 publications

(10 citation statements)

References 26 publications

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“…As of the end of 2022, there are more than 150,000 km of railway, of which 113,000 km are electrified. The operating mileage of high-speed rail exceeds 40,000 km, with an electrification rate of 75.3% [1][2][3]. The operation of high-speed rail Electric Multiple Units (EMUs) produces current with high frequency when the thyristor is working.…”

Section: Introductionmentioning

confidence: 99%

The Leakage Current Characteristics of High-Gradient MOA Plate and Its Heating Analysis with Coatings under High-Frequency Overvoltage

et al. 2023

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High-frequency overvoltage generated in railways results in explosions of Electric Multiple Units’ (EMUs) arrestors. To solve this problem, the leakage current characteristics and heat transfer process of high-gradient MOA plates under high-frequency overvoltage has been studied. The leakage current characteristics of arrestor plates under high-frequency voltage was obtained and the element distribution has been analyzed. Heat transfer distribution and the thermal properties of the Metal Oxide Arrestor (MOA) have been modelled. According to the results, for a given voltage, the higher the harmonic frequency, the greater the leakage current of the arrestor valve plate, and the greater the resistive component of the leakage current. The Zn and O elements in high-gradient MOA plates are more uniform. Under the same leakage current as conventional ones, the undertake voltage of a high-gradient MOA plate will increase by 10%. Longtime high-order harmonic action will still significantly improve the core rod temperature when MOA plates are coated. The temperature rise in the power supply section of EMUs during operation is roughly 35 °C. This result will provide a foundation and supporting data for the applicability of high-gradient valve plates in railroads and coating improvements for traditional arrestor plates.

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Section: Introductionmentioning

confidence: 99%

The Leakage Current Characteristics of High-Gradient MOA Plate and Its Heating Analysis with Coatings under High-Frequency Overvoltage

et al. 2023

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“…An improved approximation method based on Hertzian dipole and a numerical method based on the finite element method algorithm are proposed to calculate the radiation of a coaxial cable [14,15]. The circuit model for conducted and radiation interference on an electric railway contact line under the condition of overvoltage is established in [16], and the two types of interference are analyzed using the finite difference time domain method and segmented line technology, with the induced voltage on the cable calculated. However, when the traction network is shortcircuited, a short-circuit loop will be formed.…”

Section: Introductionmentioning

confidence: 99%

Research on EMI of Traction Network Transient Current Pulse on Shielded Cable Terminal Load

et al. 2022

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The transient current pulse (TCP) caused by the traction network short-circuit fault (TNSF) will produce a high-strength transient electromagnetic field (TEMF). The electromagnetic field will interfere with nearby weak current equipment through the shielded cable. In this paper, a transient circuit model (TCM) for the short-circuit traction network is proposed to calculate the transient current. The short circuit is equivalent to a ring, and the TEMF transient electromagnetic field is calculated based on the magnetic dipole. The current response of the TEMF transient electromagnetic field on the shielded cable is deduced based on the transmission line theory and verified by experiments. The electromagnetic interference (EMI) of a TEMF transient electromagnetic field to the shielded cable terminal load were was studied under various incidence angles, azimuth angles, and polarization angles. The results demonstrate that the greater the incident angle and azimuth angle, the greater the EMI on the terminal load. The horizontal distance between the shielded cable head and the short-circuit point should be greater than 6 m, and the incident angle should be greater than 45∘. This method can provide a theoretical basis for the electromagnetic compatibility research of traction power supply systems and their nearby weak current equipment.

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“…The electromagnetic interference (EMI) analysis of railway electrification systems is crucial in terms of providing a test and validation of the environmental compatibility as well as giving specific information about the performance when some unexpected situations such as lightning stroke [5], [6], cable overvoltage [7], and pantograph arcing [8], [9] occur. Radiated interference for the ac system was tested by experimental measurement [10], or analyzed by numerical [11] and analytical methods [12].…”

Section: Introductionmentioning

confidence: 99%

Wideband Modeling of Power SiC mosfet Module and Conducted EMI Prediction of MVDC Railway Electrification System

Zhu

Liang

Dinavahi

et al. 2020

IEEE Trans. Electromagn. Compat.

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The SiC MOSFET in the medium-voltage directcurrent (MVdc) transportation electrification system features faster switching performance, while simultaneously binging more significant electromagnetic interference (EMI) issues within the rolling stocks, substations, and radiated disturbance into space along the catenaries and tracks. Due to the necessity to involve both the transient characteristics of power semiconductor devices and the stray parameters of all the equipment in the analysis of EMI, it is considerably challenging to perform wideband device-level simulation on traditional commercial software for such a complex system with numerous trains and stations. A computationally efficient method for wideband modeling and simulation of the MVdc highspeed railway system for the assessment of conducted EMI during the project design stage is proposed in this article. Physical characteristics of the semiconductor devices, parasitic parameters of the MOSFET package, and converter topology are all taken into consideration to provide not only accurate system-level performance of the system but also an insight into high-frequency characteristics under different operation conditions. The calculation burden is alleviated by a hierarchical circuit partitioning architecture based on the frequency-dependent time-domain transmission line model and the Norton equivalent parameter extraction of each MOSFET module to split the whole system into several smaller subcircuits in terms of matrix size, and a fully parallel implementation of the MVdc system is carried out on the graphics processor. The developed program is used to study the case of Jing-Zhang high-speed railway system topology, which is compatible to be modified to the MVdc project. Simulation results show that it is essential to estimate the EMI level comprehensively considering the alternative of speed and dc voltage.

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Suppression of Cable Overvoltage in a High-Speed Electric Multiple Units System

Cited by 19 publications

References 26 publications

The Leakage Current Characteristics of High-Gradient MOA Plate and Its Heating Analysis with Coatings under High-Frequency Overvoltage

The Leakage Current Characteristics of High-Gradient MOA Plate and Its Heating Analysis with Coatings under High-Frequency Overvoltage

Research on EMI of Traction Network Transient Current Pulse on Shielded Cable Terminal Load

Wideband Modeling of Power SiC mosfet Module and Conducted EMI Prediction of MVDC Railway Electrification System

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