Low-Frequency Oscillation Suppression of the Vehicle–Grid System in High-Speed Railways Based on H? Control

Zhaozhao Geng, Zhigang Liu, Xinxuan Hu and Jing Liu
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Zhaozhao Geng: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Zhigang Liu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Xinxuan Hu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Jing Liu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Energies, 2018, vol. 11, issue 6, 1-23

Abstract: Recently, a traction blockade in the depots of numerous electric multiple units (EMUs) of high-speed railways has occured and resulted in some accidents in train operation. The traction blockade is caused by the low-frequency oscillation (LFO) of the vehicle–grid (EMUs–traction network) system. To suppress the LFO, a scheme of EMUs line-side converter based on the H∞ control is proposed in this paper. First, the mathematical model of the four-quadrant converter in EMUs is presented. Second, the state variables are determined and the weighting functions are selected. Then, an H∞ controller based on the dq coordinate is designed. Moreover, compared with the simulation results of traditional proportional integral (PI) control, auto-disturbance rejection control (ADRC) and multivariable control (MC) based on Matlab/Simulink and the RT-LAB platform, the simulation results of the proposed H∞ control confirm that the H∞ controller applied in EMUs of China Railway High-Speed 3 has better dynamic and static performances. Finally, a whole cascade system model of EMUs and a traction network is built, in which a reduced-order model of a traction network is adopted. The experimental results of multi-EMUs accessed in the traction network indicate that the H∞ controller has good suppression performance for the LFO of the vehicle–grid system. In addition, through the analysis of sensitivity of the H∞ controller and the traditional PI controller, it is indicated that the H∞ controller has better robustness.

Keywords: high-speed railway; EMUs–traction network; converter; low-frequency oscillation; H? control (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: 2018
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