Modeling and Analysis of Low-Frequency Oscillation for Electrified Railway under Mixed Operation of Passenger and Freight Trains

Yunling Wang, Ting Li, Jiawei Liu, Fang Liu, Yunche Su, Qiao Zhang (), Weilu Zhang and Zhigang Liu
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Yunling Wang: State Grid Sichuan Economic Research Institute, Chengdu 610041, China
Ting Li: State Grid Sichuan Economic Research Institute, Chengdu 610041, China
Jiawei Liu: State Grid Sichuan Economic Research Institute, Chengdu 610041, China
Fang Liu: State Grid Sichuan Economic Research Institute, Chengdu 610041, China
Yunche Su: State Grid Sichuan Economic Research Institute, Chengdu 610041, China
Qiao Zhang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610032, China
Weilu Zhang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610032, China
Zhigang Liu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610032, China

Energies, 2022, vol. 15, issue 20, 1-20

Abstract: Addressing the shortcomings of existing low-frequency oscillation research on electrified railways, which has mainly focused on single-type trains and lacks the accurate modeling of traction inverter systems, in this paper we modeled and analyzed low-frequency oscillations in an electrified railway passenger and freight mixed-operation vehicle–grid system. First, an equivalent model of the DC side of the traction inverter was established, with the inverter system being equivalent to the parallel connection of the load resistance and the current source, and the specific mathematical expression was determined and verified by impedance measurement. Secondly, based on the equivalent model of the DC side of the traction inverter, a small signal model of the vehicle–grid system under the mixed operating conditions of CRH5 and HXD 2B considering the inverter system was established. The generalized Nyqusit criterion was used to study the low-frequency oscillation characteristics under mixed transportation conditions. The accuracy of the established model and the correctness of the theoretical analysis were verified based on Matlab/Simulink. Finally, using the dominant pole theory to analyze the low-frequency stability conditions, the relationship between the number of mixed trains and the minimum short-circuit ratio was obtained, and the simulation verification was carried out.

Keywords: electrified railway; low-frequency oscillation; traction inverter system; mixed operation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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