Research on the influence of electric railway bilateral power supply on power system and countermeasures

Zhang, Liyan; Li, Xin; Liang, Shiwen; Han, Dushuo

doi:10.1016/j.ijepes.2021.107769

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…However, if this power angle exceeds certain value, again circulating currents become dominant and offset any saving by RBE. Techniques exist in literature to reduce the power angle [11]. However, these are beyond the scope of this paper.…”

Section: Resultsmentioning

confidence: 99%

Efficient utilization of regenerative braking energy in bilateral co-phase systems

Pande¹,

Koseki²

Civil-Comp Conferences

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This paper takes the example of Indian Railways to show efficient utilization of regenerative braking energy(RBE) in bilateral co-phase systems. Indian Railways traction supply comes from the public utility grid. With the increase in three-phase locomotives there is an enhanced feedback of RBE to the grid especially when there is no available locomotive to absorb this RBE in the same feeding power sector. This often leads to impact on the utility grid (due to the harmonics in RBE) and presently there is no provision to account for the energy flowing back to the grid in the energy bill. Thus it becomes imperative to efficiently utilize this RBE in the railway network itself. In our work we model 25kV, 1-ø, AC traction system of Indian Railways and demonstrate the energy saving achieved by modifying the existing traction power system to bilateral co-phase system. We also demonstrate the importance of immediate switching over to 3-ø, regenerating locomotives by showing an energy saving of 1.93%. We show an additional energy saving of 0.28% by adopting bilateral co-phase system. We further show the dependence of energy saving on power angle(difference of voltage angles) between adjacent traction sub-station(TSS). Trains are power loads and determining voltages and currents drawn by trains is therefore a non-linear problem. In order to model our approach, we employ conventional iterative Newton-Raphson(NR) load flow method(due to non-linearity) to evaluate voltages, currents and energy saving. This approach also takes care of line losses, due to line impedance, and is accurate. The implementation is complex as compared to traditional power systems because of the presence of moving train loads.

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Section: Resultsmentioning

confidence: 99%

Efficient utilization of regenerative braking energy in bilateral co-phase systems

Pande¹,

Koseki²

Civil-Comp Conferences

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Analysis and Research of Networked Traction Power Supply System

Zhuo,

Han,

Gao

2023

Lecture Notes in Electrical Engineering

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Low-frequency oscillation of train–network system considering traction power supply mode

Liu,

Lyu,

Chang

et al. 2024

Railw. Eng. Sci.

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The low-frequency oscillation (LFO) has occurred in the train–network system due to the introduction of the power electronics of the trains. The modeling and analyzing method in current researches based on electrified railway unilateral power supply system are not suitable for the LFO analysis in a bilateral power supply system, where the trains are supplied by two traction substations. In this work, based on the single-input and single-output impedance model of China CRH5 trains, the node admittance matrices of the train–network system both in unilateral and bilateral power supply modes are established, including three-phase power grid, traction transformers and traction network. Then the modal analysis is used to study the oscillation modes and propagation characteristics of the unilateral and bilateral power supply systems. Moreover, the influence of the equivalent inductance of the power grid, the length of the transmission line, and the length of the traction network are analyzed on the critical oscillation mode of the bilateral power supply system. Finally, the theoretical analysis results are verified by the time-domain simulation model in MATLAB/Simulink.

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Research on the influence of electric railway bilateral power supply on power system and countermeasures

Cited by 7 publications

References 18 publications

Efficient utilization of regenerative braking energy in bilateral co-phase systems

Efficient utilization of regenerative braking energy in bilateral co-phase systems

Analysis and Research of Networked Traction Power Supply System

Low-frequency oscillation of train–network system considering traction power supply mode

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