Grounding Points Model for Safety Enhancement in Autotransformer Configuration Railway System
Abstract
Electrified Urban Massive Transportation Railway Systems require the supply of electric power that complies to electromagnetic and safety standards, as well as operational regulation. This paper presents a mathematical modelling of a complete Autotransformer Configuration Railway System. The innovation of this study relies on the consideration of grounding points to calculate realistic rail voltages to perform safety improvements. This research incorporates the Carson’s Line model to accurately depict the self- and mutual- impedances between the conductors of the railway system. A case study is simulated using real-world rail data from a quad-track AT railway system located in United Kingdom. The results have proven that the inclusion of grounding points in the load model significantly reduces the rail voltage resulting from self- and mutual- induction, thus increasing the effectiveness and robustness in achieving more realistic voltage calculations and enhancing safety level for improved industry practices.References
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[2] B. S. EN, “50163: 2004:“Railway applications,” Supply voltages Tract. Syst.
[3] I. E. Commission, “Railway Applications—Supply Voltages of Traction Systems.” Standard IEC-60850, 2007.
[4] A. Cozza and B. Démoulin, “On the modeling of electric railway lines for the assessment of infrastructure impact in radiated emission tests of rolling stock,” IEEE Trans. Electromagn. Compat., vol. 50, no. 3, pp. 566–576, 2008.
[5] IEEE, IEEE guide for safety in AC substation grounding. IEEE, 2000.
[6] S. Hu et al., “A power factor-oriented railway power flow controller for power quality improvement in electrical railway power system,” IEEE Trans. Ind. Electron., vol. 64, no. 2, pp. 1167–1177, 2017.
[7] S. Hu et al., “Power Flow Controller Design for Planning Stage Railway Systems,” IEEE Trans. Ind. Electron., 2017.
[8] B. Mohamed, P. Arboleya, and M. Plakhova, “Current injection based Power Flow Algorithm for bilevel 2× 25kV railway systems,” in Power and Energy Society General Meeting (PESGM), 2016, 2016, pp. 1–5.
[9] B. Singh, G. Bhuvaneswari, and V. Garg, “Improved power quality AC-DC converter for electric multiple units in electric traction,” in Power India Conference, 2006 IEEE, 2006, p. 6–pp.
[10] R. W. White, “AC supply systems and protection,” Fourth Vocat. Sch. Electr. Tract. Syst. IEE Power Div., 1997.
[11] I. M. Abdulaziz, Mathematical modelling and computer simulations of induced voltage calculations in AC electric traction. Napier University, 2003.
[12] T. Kulworawanichpong, “Optimising AC electric railway power flows with power electronic control.” University of Birmingham, 2004.
[13] J. Feng, W. Q. Chu, Z. Zhang, and Z. Q. Zhu, “Power electronic transformer-based railway traction systems: Challenges and opportunities,” IEEE J. Emerg. Sel. Top. Power Electron., vol. 5, no. 3, pp. 1237–1253, 2017.
[14] M. A. Ríos and G. Ramos, “Power system modelling for urban massive transportation systems,” in Infrastructure Design, Signalling and Security in Railway, InTech, 2012.
[15] R. J. Hill, “Electric railway traction. Part 3. Traction power supplies,” Power Eng. J., vol. 8, no. 6, pp. 275–286, 1994.
[16] J. Kilter, T. Sarnet, and T. Kangro, “Modelling of high-speed electrical railway system for transmission network voltage quality analysis: Rail Baltic case study,” in Electric Power Quality and Supply Reliability Conference (PQ), 2014, 2014, pp. 323–328.
[17] Z. Shao, “Auto-transformer power supply system for electric railways.” University of Birmingham, 1988.
[18] W. S. Chan, “Whole system simulator for AC traction.” University of Birmingham, 1988.
[19] J. D. Glover, M. S. Sarma, and T. Overbye, Power System Analysis & Design, SI Version. Cengage Learning, 2012.
[20] S. Li, “Power flow in railway electrification power system.” New Jersey Institute of Technology, Department of Electrical and Computer Engineering, 2010.
