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Energies 2017, 10(6), 794; doi:10.3390/en10060794

The Energy-Efficient Operation Problem of a Freight Train Considering Long-Distance Steep Downhill Sections

1
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
Department of Transport and Planning, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Academic Editor: Carl-Fredrik Lindberg
Received: 13 April 2017 / Revised: 16 May 2017 / Accepted: 5 June 2017 / Published: 10 June 2017
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Abstract

With the energy consumption rising in rail transport, the railway sector is showing increasing interest in the energy-efficient operation of freight trains. Freight trains require more complicated driving strategies than ordinary passenger trains do due to their heavy loads, especially in the long-distance steep downhill (LDSD) sections that are very common in freight rail lines in China. This paper studies the energy-efficient operation of a freight train considering LDSD sections. An optimal control model including regenerative and pneumatic braking is developed for the freight train. Then, when a train leaves/enters the LDSD section, we verify the uniqueness of control transitions and discuss the speed profile linkage between LDSD and its adjacent sections, which indicates that the periodic braking should be applied on LDSD sections for optimality. Additionally, given the same running time for the entire journey, our analysis shows that electrical braking-full braking strategy is more energy-efficient than coasting-full braking strategy on LDSD sections. Finally, a numerical algorithm for the optimal driving solution is proposed. The simulation results demonstrate that the driving strategies generated by the proposed algorithm performs better than those from fuzzy predictive control and field operation regarding energy saving. View Full-Text
Keywords: freight train; energy-efficient operation; maximum principle; periodic braking; numerical algorithm freight train; energy-efficient operation; maximum principle; periodic braking; numerical algorithm
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Lin, X.; Wang, Q.; Wang, P.; Sun, P.; Feng, X. The Energy-Efficient Operation Problem of a Freight Train Considering Long-Distance Steep Downhill Sections. Energies 2017, 10, 794.

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