Abstract
Continuous power supply in railway systems is vital to guarantee dependable accomplishment of energy-supported critical operations. With reference to the Italian railway infrastructure, this paper focuses on the railroad signaling system, used to control the movement of railway traffic, where Uninterruptable Power Supply systems (UPS) for Safety and Signalling are employed. Fault tolerant UPS architectures are adopted to cope with unpredictable fault events occurring at UPS level, potentially resulting in safety/availability violations. This paper proposes a stochastic model-based analysis to support the comparison between different UPS redundant architectures in terms of dependability attributes, primarily reliability and availability indicators. The analysis results can be fruitfully exploited by a designer to set up the most effective UPS configuration, able to satisfy dependability requirements, while also accounting for possible saving in energy consumption.
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Notes
- 1.
In the railway sector UPS is often referred as Integrated Power Supply (IPS). In this paper we adhere to the most general terminology.
- 2.
SIAP, RFI IS732 - Ed. 1999.
- 3.
SMAP [10].
- 4.
A typical transformer employed in the considered context can waste about \(4\%\) of the transformed power in heat.
- 5.
Notice that the mentioned standard is EN 62040 VFI, that is not specific for railway applications.
- 6.
SMAP [10].
- 7.
https://gitea-s2i2s.isti.cnr.it/gmasetti/CompareSRandCRinRailwaySignalingUPS.git: free code written in MATLAB, but with small changes can also be executed with Octave. No special programming skills are required.
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Acknowledgements
This study was partially carried out within MOST - Sustainable Mobility National Research Center and received funding from the European Union Next-GenerationEU (PIANO NAZIONALE DI RIPRESA E RESILIENZA (PNRR)-MISSIONE 4 COMPONENTE 2, INVESTIMENTO 1.4-D.D. 1033 17/06/2022, CN00000023), and SmaRIERS, POR FESR Toscana 2014–2020 Asse 1 - Azione 1.1.5 sub a1. This paper reflects only the authors’ views and opinions, neither the European Union nor the European Commission can be considered responsible for them.
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Masetti, G., Di Giandomenico, F., Chiaradonna, S. (2023). Dependability Analysis of UPS Architectures for the Italian Railway Signaling System. In: Milius, B., Collart-Dutilleul, S., Lecomte, T. (eds) Reliability, Safety, and Security of Railway Systems. Modelling, Analysis, Verification, and Certification. RSSRail 2023. Lecture Notes in Computer Science, vol 14198. Springer, Cham. https://doi.org/10.1007/978-3-031-43366-5_6
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