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Abstract

Due to different reasons a significant modal shift from railway to road transport took place over last decades. The basic reasons are pointed in the paper introduction together with contradicting transport policy taking into account environmental and economical challenges. Political vision to stimulate modal shift from road and air to railway cannot become true without achieving railway technical and operational interoperability. Paper describes wide range of technical barriers between individual intraoperable railway systems in civil engineering structures, traction power supply, control command and signalling and the ways, which are being applied to ensure stepwise converging of the technical solutions taking into account safety and technical compatibility, as well as other essential requirements, namely: reliability, accessibility, health and environment.

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Authors and Affiliations

M. Pawlik
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Abstract

Installation and operation of rail vehicles powered by multiple system voltages forces the construction of multi-system traction substation. The article describes a traction substation power supply with 15 kV output voltage and frequency Hz and 25 kV at 50 Hz. The topology of the power electronics system and the control structure of the power supply enables parallel connection of several power supplies. The selected topology and control structure ensures minimizing the rms value of the LCRL filter capacitor current used at the output of the inverters. The article analyses the influence of harmonics consumed by the active front end (AFE) rectifier used in traction vehicles on the rms current of the LCRL filter capacitor.
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Bibliography

  1.  L. Asiminoaei, E. Aeloiza, P.N. Enjeti, and F. Blaabjerg, “Shunt Active-Power-Filter Topology Based on Parallel Interleaved Inverters”, IEEE Trans. Ind. Electron. 55(3), 1175–1189 (2008), doi: 10.1109/TIE.2007.907671.
  2.  H.-G. Jeong, D.-K. Yoon, and K.-B. Lee, “Design of an LCL-Filter for Three-Parallel Operation of Power Converters in Wind Turbines”, J. Power Electron. 13(3), 437–446 (2013), doi: 10.6113/JPE.2013.13.3.437.
  3.  T. Platek, “Analysis of Ripple Current in the Capacitors of Active Power Filters”, Energies 12(23), 1‒31 (2019), doi: 10.3390/en12234493.
  4.  D. Shin, H.-J. Kim, J.-P. Lee, T.-J. Kim, and D.-W. Yoo, “Coupling L-CL Filters and Active Damping Method for Interleaved Three-Phase Voltage Source Inverters”, in 2015 17th European Conference on Power Electronics and Applications (EPE’15 ECCE-Europe), Geneva, 2015, pp. 1‒10, doi: 10.1109/EPE.2015.7309318.
  5.  G.G. Balazs, M. Horvath, I. Schmidt, and P. Kiss, “Examination of new current control methods for modern PWM controlled AC electric locomotives”, in 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012), Bristol, 2012, pp. 1‒5, doi: 10.1049/cp.2012.0314.
  6.  P. Falkowski, A. Sikorski, K. Kulikowski, and M. Korzeniewski, “Properties of active rectiefier with LCL filter in the selection process of the weighting factors in finite control set-MPC”, Bull. Pol. Acad. Sci. Tech. Sci. 68(1), 51–60 (2020), doi: 10.24425/bpasts.2020.131836.
  7.  J. Michalik, J. Molnar, and Z. Peroutka, “Optimal Control of Traction Single-Phase Current–Source Active Rectifier”, in Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010, Ohrid, 2010, pp. T9-82-T9-88, doi: 10.1109/ EPEPEMC.2010.5606604.
  8.  L.Di. Donna, F. Liccardo, P. Marino, C. Schiano, and M. Triggianese, “Single-phase synchronous active front-end for high power applications,” in Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005, Dubrovnik, Croatia, 2005, vol. 2, pp. 615‒620, doi: 10.1109/ISIE.2005.1528987.
  9.  D.G. Holmes, T.A. Lipo, Pulse Width Modulation For Power Converters, pp. 125–146, IEEE PRESS, Willey-Interscience. Copyright, 2003.
  10.  W. Wu, M. Huang, and F. Blaabjerg, “Efficiency comparison between the LLCL and LCL-filters based single-phase grid-tied inverters“, Arch. Electr. Eng. 63(1), 63‒79 (2014), doi: 10.2478/aee-2014-0005.
  11.  M. Liserre, F. Blaabjerg, and S. Hansen, “Design and Control of an LCL-Filter-Based Three-Phase Active Rectifier”, IEEE Trans. Ind. Appl. 41(5), 1281‒1291 (2005), doi: 10.1109/TIA.2005.853373.
  12.  K. Jalili and S. Bernet, “Design of LCL Filters of Active-Front-End Two-Level Voltage-Source Converters”, IEEE Trans. Ind. Electron. 56(5), 1674‒1689, (2009), doi: 10.1109/TIE.2008.2011251.
  13.  S. Piasecki, R. Szmurlo, J. Rabkowski, and M. Jasinski, “Dedicated system for design, analysis and optimization of AC-DC converters”, Bull. Pol. Acad. Sci. Tech. Sci. 64(4), 897‒905 (2016).
  14.  F. Liu, X. Zha, Y. Zhou, and S. Duan, “Design and research on parameter of LCL filter in three-phase grid-connected inverter”, in Power Electronics and Motion Control Conference, 2009. IPEMC ’09. IEEE 6th International, May 2009, pp. 2174 –2177, doi: 10.1109/ IPEMC.2009.5157762.
  15.  M.A. Abusara, M. Jamil, and S. M. Sharkh, “Repetitive current control of an interleaved grid connected inverter”, in Proc. 3rd IEEE Int. Symp. Power Electron. Distrib. Gener. Syst. (PEDG), Aalborg, 2012, pp. 558–563, doi: 10.1109/PEDG.2012.6254057.
  16.  A.A. Rockhill, M. Liserre, R. Teodorescu, and P. Rodriguez, “Grid-Filter Design for a Multimegawatt Medium-Voltage Voltage-Source Inverter”, IEEE Trans. Ind. Electron. 58(4), 1205–1217 (2011), doi: 10.1109/TIE.2010.2087293.
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Authors and Affiliations

Tadeusz Płatek
1
Tomasz Osypinski
2
Zdziaław Chłodnicki
2

  1. Institute of Control and Industrial Electronics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
  2. Medcom Company, Jutrzenki 78A, 02-315 Warsaw, Poland
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Abstract

In order to achieve energy savings and promote on-site integration of photovoltaic energy in electrified railways, a topology structure is proposed for the integration of photovoltaic (PV) and the energy storage system (ESS) into the traction power supply system (TPSS) based on a railway power conditioner (RPC). This paper analyzes the composition and operation principles of this structure. To assess the economic benefits brought by the integration of photovoltaic and energy storage systems, a bilevel optimization model is established, with the objectives of optimizing energy storage capacity configuration and photovoltaic energy integration. The KKT (Karush–Kuhn–Tucker) method is employed to transform the model into a single-layer mixed-integer linear programming model, which is then solved using the CPLEX solver in MATLAB. The research findings indicate that, with the configuration of the ESS, the optimal PV consumption rate achieved is 96.8749%. Compared to a 100% PV consumption rate, the ESS capacity configuration is reduced by 13.14%, and the overall operational cost of the TPSS is at its lowest. The study suggests that the proposed bilevel optimization algorithm can more effectively consider PV consumption, leading to enhanced economic performance of the TPSS operation.
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Authors and Affiliations

Wei Zhang
1
ORCID: ORCID
Xiaoqiang Chen
1
Ying Wang
1
ORCID: ORCID

  1. School of Automation and Electrical Engineering, Lanzhou Jiaotong University Lanzhou,730070 China
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Abstract

The operating temperature of the transmission line in the traction network is affected by geographical and climatic factors, especially the wind speed. To make better use of the thermal stability transmission capacity of the traction power supply system in improving the short-term emergency transmission capacity, the dynamic rating technology is introduced into the traction power supply system. According to the time-varying characteristics of the actual wind speed, a dynamic rating method of the traction network based on wind speed prediction is proposed and constructed. Based on the time series model in predicting the wind speed series along the corridor of the traction network, the temperature curve of each transmission line under different currents is calculated by combining it with the heat balance equation of an IEEE-738 capacity expansion model, thus the relationship between the peak operating temperature and current of each transmission line in the prediction period is obtained. According to the current distribution coefficient, the capacity increase limit of the traction network is determined. The example shows that the proposed dynamic rating method based on wind speed prediction is an effective method to predict the short-term safe capacity increase limit of the traction network, which can increase the comprehensive capacity of the traction network by about 45% in the next six hours, and the capacity increase effect is obvious, which can provide reference and technical support for short-term emergency dispatching of traction power supply dispatching centres.
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Authors and Affiliations

Zhaoxu Su
1
ORCID: ORCID
Mingxing Tian
1
Lijun Sun
1
Ruopeng Zhang
1

  1. School of Automation and Electrical Engineering, Lanzhou Jiaotong University, China
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Abstract

High-frequency resonance is a prominent phenomenon which affects the normal operation of the high-speed railway in China. Aiming at this problem, the resonance mechanism is analyzed first. Then, model predictive control and selective harmonic elimination pulse-width modulation (MPC-SHEPWM) combined control strategy is proposed, where the harmonics which cause the resonance can be eliminated at the harmonic source. Besides, the MPC is combined to make the current track the reference in transients. The proposed control has the ability to suppress the resonance while has a faster dynamic performance comparing with SHEPWM. Finally, the proposed MPC-SHEPWM is tested in a simulation model of CRH5 (Chinese Railway High-speed), EMUs (electric multiple units) and a traction power supply coupled system, which shows that the proposed MPC-SHEPWM approach can achieve the resonance suppression and shows a better dynamic performance.
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Bibliography

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Authors and Affiliations

Sitong Chen
1
ORCID: ORCID
Xiaoqiang Chen
1
Ying Wang
1
ORCID: ORCID
Ye Xiong
1

  1. School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou, China

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