Indirect current controlled VSC-based RPFC for power management in a railway power supply system
Abstract
A traction substation manages the railway power flow control (RPFC) in electrical power system. Special transformers are used in a traction substation along with power electronics converters to achieve power balance and load reactive power compensation. This study introduces the use of a conventional three-phase substation transformer along with a three-leg, four-wire power converter to address the issues of power quality and current unbalance of a traction substation. The proposed topology's control algorithm is developed to draw balance power from the three-phase supply while supplying single-phase power to two traction sections. The converter regulates the flow of power such that the currents are drawn from all the phases of the transformer. The converter also provides support to the load-reactive power requirement. An indirect control of the voltage source converter (VSC) is adopted to reduce the computational burden of the control algorithm. The control algorithm is analytically studied. The system operation is analysed using a discrete simulation environment under different loading scenarios. The study is presented as a proof of concept.
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A. Beirami, H. Feshki Farahani, “Adaptive hysteresis band current control-based power conditioner to improve the power quality of V/V railway supply system,” International Journal of Circuit Theory and Applications, 46(8), pp. 1551-1564, 2018.
B. Xie, Z. Zhang, S. Hu, Y. Li, L. Luo, S. Sun, “Yn/vd connected balance transformer-based electrical railway negative sequence current compensation system with passive control scheme,” IET Power Electronics, 9(10), pp. 2044-2051, 2016.
S. M. M. Gazafrudi, A. T. Langerudy, E. F. Fuchs, K. Al-Haddad, “Power quality issues in railway electrification: A comprehensive perspective,” IEEE Transactions on Industrial Electronics, 62(5), pp. 3081-3090, 2015.
Z. Zhang, B. Wu, J. Kang, L. Luo, “A multi-purpose balanced transformer for railway traction applications,” IEEE Transactions on Power Delivery, 24(2), pp. 711-718, 2009.
W.-S. Chu, J.-C. Gu, “A new hybrid SVC scheme with Scott transformer for balance improvement,” Proceedings of the 2006 IEEE/ASME Joint Rail Conference, Atlanta, GA, USA, 2006, pp. 217-224.
B.-K. Chen, B.-S. Guo, “Three phase models of specially connected transformers,” IEEE Transactions on Power Delivery, 11(1), pp. 323-330, 1996.
G. Firat, G. Yang, H. A. H. Al-Ali, “A comparative study of different transformer connections for railway power supply- mitigation of voltage unbalance,” 10th International Conference on Advances in Power System Control, Operation Management (APSCOM 2015), Hong Kong, 2015, pp. 1-6.
H. Hu, Y. Liu, Y. Li, Z. He, S. Gao, X. Zhu, H. Tao, “Traction power systems for electrified railways: evolution, state of the art, and future trends,” Railway Engineering Science, 32(1), pp. 1-19, 2024.
M. Habibolahzadeh, H. M. Roudsari, A. Jalilian, “Hybrid SVC-HPQC scheme with partial compensation technique in co-phase electric railway system,” 27th Iranian Conference on Electrical Engineering (ICEE), Yazd, Iran, 2019, pp. 679-684. [10] S. Hu, Y. Li, B. Xie, M. Chen, Z. Zhang, L. Luo, Y. Cao, A. Kubis, C. Rehtanz, “A Yd multifunction balance transformer-based power quality control system for single-phase power supply system,” IEEE Trans. on Ind. Appl., 52(2), pp. 1270-1279, 2016.
S. Hu, Z. Zhang, Y. Chen, G. Zhou, Y. Li, L. Luo, Y. Cao, B. Xie, X. Chen, B.Wu, et al., “A new integrated hybrid power quality control system for electrical railway,” IEEE Transactions on Industrial Electronics, 62(10), pp. 6222-6232, 2015.
A. T. Langerudy, et al., “Hybrid railway power quality conditioner for high capacity traction substation with auto-tuned dc-link controller,” IET Electrical Systems in Transportation, 6(3), pp. 207-214, 2016.
B. Xie, Y. Li, Z. Zhang, S. Hu, Z. Zhang, L. Luo, Y. Cao, F. Zhou, R. Luo, L. Long, “A compensation system for cophase high-speed electric railways by reactive power generation of SHC & SAC,” IEEE Trans. on Industry. Elec., 65(4), pp. 2956-66, 2018.
M. Habibolahzadeh, H. M. Roudsari, A. Jalilian, S. Jamali, “Improved railway static power conditioner using c-type filter in Scott co-phase traction power supply system,” 10th International Power Electronics, Drive Systems and Technologies Conference (PEDSTC), Shiraz, Iran, 2019, pp. 355-360.
S. Hu, Z. Zhang, Y. Li, L. Luo, P. Luo, Y. Cao, Y. Chen, G. Zhou, B. Wu, C. Rehtanz, “A new railway power flow control system coupled with asymmetric double LC branches, IEEE Transactions on Power Electronics, 30(10), pp. 5484-5498, 2015.
Z. Zhang, B. Xie, S. Hu, Y. Li, L. Luo, C. Rehtanz, O. Krause, “Reactive power compensation and negative-sequence current suppression system for electrical railways with YNvd-connected balance transformer-part I: Theoretical analysis,” IEEE Transactions on Power Electronics, 33(1), pp. 272-282, 2018.
B. Xie, Z. Zhang, Y. Li, S. Hu, L. Luo, C. Rehtanz, O. Krause, “Reactive power compensation and negative-sequence current suppression system for electrical railways with YNvd-connected balance transformer-Part II: Implementation and verification,” IEEE Transactions on Power Electronics, 32(12), pp. 9031-9042, 2017.
Z. Sun, X. Jiang, D. Zhu, G. Zhang, “A novel active power quality compensator topology for electrified railway,” IEEE Transactions on Power Electronics, 19(4), pp. 1036-1042, 2004. [19] A. P. Shayer, M. A. Mulla, “Δ-Y transformer-based railway co-phase power system,” Arabian Journal for Science and Engineering, 49(12), pp. 16533-16548, 2024.
L. Guangye, Y. Yihan, “Three-phase-to-four-phase transformer for four-phase power-transmission systems,” IEEE Transactions on Power Delivery, 17(4), pp. 1018-1022, 2002.
X. Yuan, W. Merk, H. Stemmler, J. Allmeling, “Stationary-frame generalized integrators for current control of active power filters with zero steady-state error for current harmonics of concern under unbalanced and distorted operating conditions,” IEEE Transactions on Industry Applications, 38(2), pp. 523-532, 2002.
W. V. Lyon, “Applications of the method of symmetrical components,” McGraw-Hill Book Company, 1937.
H. Arghavani, M. Peyravi, “Unbalanced current-based tariff,” CIRED – Open Access Proc. Journal, pp. 883-887, 2017.
URN: https://sloi.org/urn:sl:tjoee93329
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