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

The diffusion of modern electric trains equipped with high-power voltage-source converters has introduced new dynamic interactions with the ac traction power system that may create unexpected low-frequency oscillations (LFOs). This paper presents for the first time a detailed analysis of the operati...

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Bibliographic Details
Published in:IEEE transactions on transportation electrification 2019-09, Vol.5 (3), p.715-726
Main Authors: Jiang, Xiaofeng, Hu, Haitao, Yang, Xiaowei, He, Zhengyou, Qian, Qingquan, Tricoli, Pietro
Format: Article
Language:English
Subjects:
Adaptive mitigation scheme
Adaptive systems
Alternating current
Analytical models
Computer simulation
Control stability
Control systems design
Controllers
Converters
Current control
Direct current
Dynamic models
Dynamic stability
Electric power systems
low-frequency oscillation (LFO)
mismatch
Oscillations
Oscillators
Parameters
parameters tuning
Power system dynamics
Power system stability
Rail transportation
Stability analysis
System dynamics
Traction
Traffic engineering
train-network system
Trains
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Summary:The diffusion of modern electric trains equipped with high-power voltage-source converters has introduced new dynamic interactions with the ac traction power system that may create unexpected low-frequency oscillations (LFOs). This paper presents for the first time a detailed analysis of the operating conditions of electric trains and a traction network, revealing that specific changes in the operating conditions of the train-network system are responsible for the oscillations and may lead to instability. The study is carried out with an analytical dynamic model considering the transient direct current control and focuses on evaluating how the mismatch between the parameters of the controller and the controlled object of the train-network system affects the system dynamics and stability. It is shown that the retuning of controller parameters improves the dynamic performance and the stability of the train-network system, and hence an adaptive mitigation method is proposed to mitigate LFOs adopting a new design of the controller with minimal change and cost to the original system, which provides a simple solution to guide engineering practice in railway traffic. Simulations and experimental results are presented to fully validate the proposed method.
ISSN:2332-7782
2577-4212
2332-7782
DOI:10.1109/TTE.2019.2927128