Analysis and Adaptive Mitigation Scheme of Low-Frequency Oscillations in AC Railway Traction Power Systems

Jiang, Xiaofeng; Hu, Haitao; Yang, Xiaowei; He, Zhengyou; Qing-quan, Qian; Tricoli, Pietro

doi:10.1109/tte.2019.2927128

Cited by 25 publications

(5 citation statements)

References 25 publications

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“…Thus, this method can only be applied only as a temporary emergency intervention. Alternative techniques can be divided into four categories, which are the adjustment of the controller parameters [61], virtual-impedance-based methods [21], passivity-based methods [62] and new nonlinear control strategies [63].…”

Section: A Overview Of the Available Lfo Elimination Approachesmentioning

confidence: 99%

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Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Zhou

et al. 2021

IEEE Trans. Power Electron.

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The wide adoption of a new type of electric trains results in multiple frequency-scale instability problems, such as low-frequency oscillation (LFO), harmonic resonance and harmonic instability. Among them, LFO has been commonly reported at electric railway depots with multiple-energized electric trains around the whole world, thus attracting widespread research attention. LFOs cause adverse effects on the system stability and protection infrastructure of both the traction network and electric trains. This paper presents a comprehensive review of LFOs that consider both academic theoretical analysis and industrial engineering requirements. A unified mathematical model of the traction network and electric train is derived with a view to revealing the mechanism and factors that induce LFOs when these two systems interact. The study also draws deep insights from results of experimental measurements and industrial mitigation schemes already implemented in Chinese railway systems. A variety of mitigation techniques and recommendations based on theoretical principles and practical constraints are presented.

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Section: A Overview Of the Available Lfo Elimination Approachesmentioning

confidence: 99%

“…When LFO occurs, the parameters cannot by easily modified in real-time. Therefore, these methods can be combined with self-adaption methods to achieve the suppression of LFOs in real-time [61].…”

Section: Summary and Commentsmentioning

confidence: 99%

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Zhou

et al. 2021

IEEE Trans. Power Electron.

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“…2 [27]- [28]. The rectifier module adopts the transient current control algorithm with the SPWM, where the equivalent switching frequency of the rectifiers is doubled by the multiplexing method [29]. The field-oriented control with the SVPWM are used for the inverter.…”

Section: A Electrical Model Of the Traction Drive Systemmentioning

confidence: 99%

Electrothermal Stress Analysis and Lifetime Evaluation of DC-Link Capacitor Banks in the Railway Traction Drive System

Yao

Xie

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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In the railway traction drive system, the reliability of DC-link capacitor banks faces enormous challenges due to the multi-operation conditions, the complex physical structures, and the safe operation requirements. Considering these issues, this paper proposes a reliability evaluation method of the DC-link capacitors banks to provide a guideline for preventive maintenance in the traction drive system. In the electro-thermal stress analysis, different from the conventional methods, the dynamic power loss profile is obtained by the sliding-window discrete Fourier transform (DFT) and the equivalent series resistance is fitted by the neural network. Afterward, a bidirectional thermal model is established to estimate the thermal stress under the dynamic power losses, considering the impact of thermal capacity, thermal coupling, and air-cooling heat dissipation. In addition, according to stability analysis and the rated temperature limitation, an end-of-lifetime standard that meets the safe operation requirement of the train is firstly proposed, thereby evaluating the lifetime bottleneck of the DClink capacitor banks. The evaluation results can provide a reference to use the lower-cost on-condition maintenance instead of scheduled maintenance in the railway traction drive system. Furthermore, a prototype experiment is performed to verify the effectiveness of the electro-thermal stress model.

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“…Apart from nonlinear controllers, improved linear controllers have also been researched in depth. With any changes in the linear controller, adaptive tuning of parameters in terms of the operation power is proposed to mitigate the LFO [15]. Additionally, the virtual-impedance-based method is also implemented by feedback or feedforward of voltage and current [16], which gives a clear physical meaning of impedance reshaping.…”

Section: Introductionmentioning

confidence: 99%

An Improved Q-Axis Current Control to Mitigate the Low-Frequency Oscillation in a Single-Phase Grid-Connected Converter System

Wei¹,

Zhao²,

Zhou

2023

Energies

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An electric railway system is a typical single-phase grid-connected converter system, and the low-frequency oscillation (LFO) phenomenon in electric railway systems has been widely reported around the world. Previous research has indicated that the LFO is a small-signal instability issue caused by impedance mismatching between the traction network system and electric trains. Therefore, this paper proposes an improved q-axis current control method to reshape the train’s impedance. The proposed method can be implemented easily by relating a reverse q-axis reactive current directly to the reference of the q-axis current under the dq current decoupled control. Moreover, considering the additional q-axis reactive current control, a small-signal impedance model of a train–network system is built. The impedance-based analysis results indicate that the proposed q-axis reactive current feedback control can increase the magnitude of the train’s impedance, which is beneficial to enhancing the system’s stability. Finally, this paper employs experimental results to verify the effectiveness of the proposed method.

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Analysis and Adaptive Mitigation Scheme of Low-Frequency Oscillations in AC Railway Traction Power Systems

Cited by 25 publications

References 25 publications

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Low-Frequency Oscillation in Electric Railway Depot: A Comprehensive Review

Electrothermal Stress Analysis and Lifetime Evaluation of DC-Link Capacitor Banks in the Railway Traction Drive System

An Improved Q-Axis Current Control to Mitigate the Low-Frequency Oscillation in a Single-Phase Grid-Connected Converter System

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