Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Virtual resistance with compensation link control strategy for traction network-EMUs systems

  • Xuesong Zhou (Department of Electrical Engineering and Automation, Tianjin University of Technology) ;
  • Yifan Hu (Department of Electrical Engineering and Automation, Tianjin University of Technology) ;
  • Yu Tian (Manufacturing Technology Center, CRRC Tangshan Co., Ltd) ;
  • Tianqi Wang (School of Data Science, City University of Hong Kong)
  • Received : 2022.03.18
  • Accepted : 2022.11.02
  • Published : 2023.04.20
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Abstract

A coupled system composed of a traction network and electric multiple units (EMUs) may oscillate or be prone to instability due to the influence of the large number of nonlinear power electronic devices introduced by the EMUs. To solve this problem, this paper proposes a virtual resistance with a compensation link control strategy for the four-quadrant converters of EMUs. First, based on the actual background, input and output impedance models of the coupled system are established, including the output impedance model of the traction network and the input impedance model of the EMUs. Based on the above models, the factors affecting the stability of the coupled system are analyzed by utilizing the impedance matching analysis method and the generalized Nyquist stability criterion (GNC). In the proposed control strategy, virtual resistance is used to adjust the loop gain and to increase system damping, which can improve the stability margin of the system. Virtual resistance can also increase the initial power equivalent to improve system stability. The introduction of the compensation link is to suppress the increasing tendency of the intermediate DC voltage steady-state error caused by the virtual resistance. The parameters of the virtual impedance and the compensation link are designed by forbidden region criterion to meet engineering requirements. With the proposed control strategy, the maximum EMU number to ensure system stability has been significantly increased. Finally, simulations and experiments verify the correctness of the analysis and the effectiveness of the proposed control strategy.

Keywords

Acknowledgement

This work is funded by National Natural Science Foundation of China (No. 51877152); Tianjin Research Innovation Project for Postgraduate Students (No. 2021YJSS090)

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