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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Zhaozhao Geng & Zhigang Liu & Xinxuan Hu & Jing Liu, 2018. "Low-Frequency Oscillation Suppression of the Vehicle–Grid System in High-Speed Railways Based on H∞ Control," Energies, MDPI, vol. 11(6), pages 1-23, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1594-:d:153121
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    References listed on IDEAS

    as
    1. Yingjie Wang & Jiashi Wang & Wei Zeng & Haiyuan Liu & Yushuo Chai, 2018. "H ∞ Robust Control of an LCL-Type Grid-Connected Inverter with Large-Scale Grid Impedance Perturbation," Energies, MDPI, vol. 11(1), pages 1-19, January.
    2. Wei Jin & Yongli Li & Guangyu Sun & Lizhi Bu, 2017. "H∞ Repetitive Control Based on Active Damping with Reduced Computation Delay for LCL-Type Grid-Connected Inverters," Energies, MDPI, vol. 10(5), pages 1-19, April.
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