Low-frequency oscillation of train–network system considering traction power supply mode

Abstract

The low-frequency oscillation (LFO) has occurred in the train–network system due to the introduction of the power electronics of the trains. The modeling and analyzing method in current researches based on electrified railway unilateral power supply system are not suitable for the LFO analysis in a bilateral power supply system, where the trains are supplied by two traction substations. In this work, based on the single-input and single-output impedance model of China CRH5 trains, the node admittance matrices of the train–network system both in unilateral and bilateral power supply modes are established, including three-phase power grid, traction transformers and traction network. Then the modal analysis is used to study the oscillation modes and propagation characteristics of the unilateral and bilateral power supply systems. Moreover, the influence of the equivalent inductance of the power grid, the length of the transmission line, and the length of the traction network are analyzed on the critical oscillation mode of the bilateral power supply system. Finally, the theoretical analysis results are verified by the time-domain simulation model in MATLAB/Simulink.

Keywords

Low-frequency oscillation / Train–network system / Modal analysis / Bilateral power supply / Participation factor

References

[1.] Wu S Liu Z. Low-frequency stability analysis of vehicle-network system with active power filter based on dq-frame impedance. IEEE Trans Power Electron, 2021 36 8 9027-9040

[2.] Hu H Tao H Blaabjerg F . Train–network interactions and stability evaluation in high-speed railways—part I: phenomena and modeling. IEEE Trans Power Electron, 2018 33 6 4627-4642

[3.] Liu Z Meng X Zhang Q . Issues, challenges and countermeasures in traction power supply system of high-altitude mountain railway. Power Syst Technol, 2023 47 05 2039-2054

[4.] Chunfang Lu Chaoxun C. Challenges and countermeasures for construction safety during the Sichuan-Tibet railway project. Engineering, 2019 5 5 833-838

[5.] Zhang Q Zhang Y Huang Ke . Modeling of regenerative braking energy for electric multiple units passing long downhill section. IEEE Trans Transp Electrif, 2022 8 3 3742-3758

[6.] Yunchuan D Zongliang L. Thoughts on challenges faced by Sichuan-Tibet railway electrification project and its solutions. Electr Railway, 2019 30 S1 5-11

[7.] Yan H Xie S Wang H . Research on tree bilateral continuous power supply scheme and its application. Electr Power Autom Equip, 2022 42 5 191-197

[8.] Zhou Z. Cophase connected power supply scheme of heavy haul railway based on tree bilateral power supply. J Railway Sci Eng, 2020 17 3 722-731

[9.] Meng X, Xia W, Deng Y, Liu Z (2021) Low-frequency oscillation research of Sichuan–Tibet railway under bilateral power supply for mixed passenger and freight locomotives operation. In: Proceedings of the 5th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT), Qingdao, Oct. 22 - 24, 2021. Springer pp 607–616

[10.] Li Q Wang H Xie S. Discussion on application of bilateral power supply technology on electrified railway. Electric Railway, 2021 32 6 1-4

[11.] Zhang L Li X Liang S . Research on the influence of electric railway bilateral power supply on power system and countermeasures. Int J Electr Power Energy Syst, 2022 137

[12.] Wang F, Wu M, Zhang S (2020) Research on bilateral power supply technology of electrified railway. In: Asia Energy and Electrical Engineering Symposium (AEEES), Chengdu, pp 311–317

[13.] Fan H (2015) Performance analysis of double-sided power supply system for electrified railway. Dissertation, Southwest Jiaotong University (in Chinese)

[14.] Li X Liu J Chen C . Research on analysis of voltage loss of parallel bilateral power supply system and countermeasures. Proc CSU-EPSA, 2022 34 11 92-99

[15.] Zhou Y Hu H Yang X . Low-frequency oscillation traceability and suppression in railway electrification systems. IEEE Trans Ind Appl, 2019 55 6 7699-7711

[16.] Hu H Tao H Wang X Blaabjerg F He Z Gao S. Train–network interactions and stability evaluation in high-speed railways—part II: Influential factors and verifications. IEEE Trans Power Electron, 2018 33 6 4643-4659

[17.] Kong R Lyu X Wang X . Modeling and analysis of low-frequency oscillation in train–network system under mixed operation of trains. Proc CSEE, 2023 43 10 3768-3780

[18.] Frutos P Ladoux P Roux N . Low frequency stability of AC railway traction power systems: analysis of the influence of traction unit parameters. Electronics, 2022 11 10 1593

[19.] Meng Z Haitao Hu Zhou Yi. Study on the influence of electric locomotive operating conditions on low frequency oscillation of vehicle network System. J Electr Eng, 2022 17 2 131-141

[20.] Lv X Wang X Che Y . Eigenvalue-Based harmonic instability analysis of electrical railway vehicle-network system. IEEE Trans Transp Electrif, 2019 5 3 727-744

[21.] Wang H Mingli W Sun J. Analysis of low-frequency oscillation in electric railways based on small-signal modeling of vehicle-grid system in dq frame. IEEE Trans Power Electron, 2015 30 9 5318-5330

[22.] Wang X Blaabjerg F. Harmonic stability in power electronic based power systems: concept, modeling, and analysis. IEEE Trans Smart Grid, 2019 10 3 2858-2870

[23.] Liao Y Liu Z Zhang H . Low-Frequency stability analysis of single-phase system with dq-frame impedance approach—part 1: impedance modeling and verification. IEEE Trans Ind Appl, 2018 54 5 4999-5011

[24.] Chang M, Wang X, Lv X, et al (2022) SISO impedance modeling of vehicle-grid system for low-frequency oscillation analysis. In: 2022 IEEE Power & Energy Society General Meeting (PESGM), Denver, pp 1–5

[25.] Wilsun Xu HuangCui ZYu . (2005) Harmonic resonance mode analysis. IEEE Trans Power Deliv, 2005 20 2 1182-1190

[26.] Qin B Yonghai Xu. Modal Analysis of multi-virtual synchronous machine grid-connected power-frequency oscillation. Proc CSEE, 2021 41 19 6570-6580

[27.] Chang M Wang X Lv X . Modeling and low-frequency oscillation analysis of an asymmetrical traction power system connected to power grid. IEEE Trans Transp Electrif, 2023 9 1 1750-1746

[28.] Wang X Harnefors L Blaabjerg F. Unified impedance model of grid-connected voltage-source converters. IEEE Trans Power Electron, 2018 33 2 1775-1787

[29.] Roy R Kailath T. ESPRIT-estimation of signal parameters via rotational invariance techniques. IEEE Trans Acoust Speech Signal Process, 1989 37 7 984-995

Funding

the Applied Basic Research Program of Science and Technology Plan Project of Sichuan Province of China(2020YJ0252)