Impedance Modeling and Harmonic Stability Analysis of Electrical Railways Integrated with Energy Storage

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Abstract
The Railway Energy Storage (ES) system, which absorbs regenerative braking energy (RBE) from the train and supplies energy to the train when needed, offers new insights into decarbonizing the electric railway energy system. However, the integration of ES depends on single-phase grid-connected converters, which will weaken the stability of the traction power supply system (TPSS) and may lead to harmonic instability issues. To address this challenge, this paper establishes a sequence impedance model for ES, which accurately characterizes its impedance features. Furthermore, based on the Generalized Nyquist Criterion (GNC), the influence of the number and the controller parameters of ES on system stability is discussed. Finally, the results show that the robustness against harmonic instability can be improved by adjusting the control parameters and the number of ES, without the need for additional hardware.
Funding Information
  • National Natural Science Foundation of China (52277126)

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