Harmonic Elimination of 25 kV AC Electric Railways Utilizing a New Hybrid Filter Structure

Document Type : Research Article

Authors

Electrical Engineering Department, Amirkabir University of Technology, Tehran, Iran

Abstract

Thyristor rectifiers are widely used in electric railways in order to control the speed. As a consequence of their usage in addition to substantial input lead current, an enormous amount of harmonics is injected into the grid. To avoid such harmonics as well as reactive power compensation, reactive power hybrid filters consisting of active and passive filters are utilized. Regarding different passive and active filters connection in a hybrid filter, various configurations of hybrid filters are possible. Each of these configurations has different functionality in harmonic elimination and reactive power compensation. Since electric railway has a non-linear and variable nature, a novel hybrid filter structure is designed that compensates reactive power and eliminates harmonics to attain desired harmonic level regarding the conventional allowable harmonics level standards. The designed filter model is simulated in MATLAB/SIMULINK and then applied to a harmonic model of an electric railway. Since electric railways are single phase loads, specific three-phase to two-phase transformers are required to feed the load. To attain such purpose, adaptive transformer is utilized in this paper. The proposed model has properly overcome the deficiencies of active and passive filters as well as demonstrating an appropriate performance in reduction of total harmonic distortion (THD).

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References

[1]S. Yousefi, A. Zaboli, M. M. Hosseini-Biyouki, H. Askarian-Abyaneh, S. H. Hosseinian, “Design of a New Structure for Hybrid Filters to Eliminate Harmonics of 25 kV AC Electric Railways,” 9th Power Systems Protection and Control Conference (PSPC 2015), 2015.
[2]S. Yousefi, “Impact of electrical trains harmonics on power quality of global network” M.Sc thesis, Amirkabir University of Technology (Tehran Polytechnic), September 2014.
[3]R. Morrison, “Power quality issues on AC traction systems,” in Harmonics and Quality of Power, 2000. Proceedings. Ninth International Conference on, 2000, pp. 709-714.
[4]J. Das, “Passive filters-potentialities and limitations,” Industry Applications, IEEE Transactions on, vol. 40, pp. 232-241, 2004.
[5]S. H. H. Sadeghi, A. D. Minassians, S. M. Kouhsari, “Power system Harmonics,” Amirkabir University of Technology Pub, 2011, pp. 273-280.
[6]H. Akagi, “New trends in active filters for power conditioning,” Industry Applications, IEEE Transactions on, vol. 32, pp. 1312-1322, 1996.
[7]H. Fujita and H. Akagi, “A practical approach to harmonic compensation in power systems-series connection of passive and active filters,” Industry Applications, IEEE Transactions on, vol. 27, pp. 1020-1025, 1991.
[8]H. Akagi, “Active harmonic filters,” Proceedings of the IEEE, vol. 93, pp. 2128-2141, 2005.
[9]P.-C. Tan, P. C. Loh, and D. G. Holmes, “Optimal impedance termination of 25-kV electrified railway systems for improved power quality,” Power Delivery, IEEE Transactions on, vol. 20, pp. 1703-1710, 2005.
[10]T. Kulworawanichpong, “Optimising AC electric railway power flows with power electronic control,” University of Birmingham, 2004.
[11]H. Akagi, Y. Kanazawa, and A. Nabae, “Instantaneous reactive power compensators comprising switching devices without energy storage components,” Industry Applications, IEEE Transactions on, pp. 625-630, 1984.
[12] J. L. Afonso, M. Freitas, and J. S. Martins, “pq Theory power components calculations,” in Industrial Electronics, 2003. ISIE’03. 2003 IEEE International Symposium on, 2003, pp. 385-390.
[13] V. Sharma and A. S. Tomer, “Comparative Analysis on Control Methods of Shunt Active Power Filter for Harmonics Mitigation,” International Journal, 2014.
[14] P. Salmeron and R. S. Herrera, “Distorted and unbalanced systems compensation within instantaneous reactive power framework,” Power Delivery, IEEE Transactions on, vol. 21, pp. 1655-1662, 2006.
[15] G. Adam, A. G. Stan, and G. Livint, “A Matlab-Simulink Approach To Shunt Active Power Filters,” in ECMS, 2011, pp. 205-210.
[16] T. Narongrit, K. Areerak, and K. Areerak, “The comparison study of current control techniques for active power filters,” Word Acad. Sci. Eng. Technol, vol. 60, pp. 471-476, 2011.
[17] Z. Zhang, B. Wu, J. Kang, and L. Luo, “A multi-purpose balanced transformer for railway traction applications,” Power Delivery, IEEE Transactions on, vol. 24, pp. 711-718, 2009.
AUT Journal of Electrical Engineering
Volume 49, Issue 1
June 2017
Pages 3-10

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