Abstract：Recently, the low-frequency oscillation (LFO) phenomenon of China railway electric multiple AC-DC-AC locomotives-traction network coupling system has occurred frequently, which seriously affects the safety and stabilization of railway system. Firstly, in order to describe the LFO mechanism, the stability of multiple locomotives-traction network coupling system is analyzed theoretically in this paper, by utilizing the impedance ratio criterion and bode diagram. Sequentially, the main influential factors of the coupling system are presented. Then, the multiple locomotives-traction network coupling system is modeling and the joint simulation is carried out on Matlab/Simulink platform. The simulation results reappear the LFO phenomenon, which verifies correctness of the theoretical analysis. Finally, according to the stability analysis results of impedance ratio criterion and Bode diagram, a LFO suppression solution with control parameters modification of the locomotive rectifier is shown. The adopted scheme is verified in computer simulations and hardware-in-the-loop (HIL) experimental tests, the simulation and experimental results verify the correctness and effectiveness of the adopted LFO suppression scheme.
邓睿, 刘碧, 宋文胜. 牵引供电网-多台机车耦合系统的低频振荡分析与抑制[J]. 电工技术学报, 2019, 34(zk1): 327-335.
Deng Rui, Liu Bi, Song Wensheng. Low-Frequency-Oscillation Analysis and Suppression of the Coupling System between Traction Network and Multi-Locomotives. Transactions of China Electrotechnical Society, 2019, 34(zk1): 327-335.
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2019, Vol. 34 
