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Modeling and Low-Frequency Oscillation Analysis of an Asymmetrical Traction Power System Connected to Power Grid
IEEE Transactions on Transportation Electrification ( IF 7 ) Pub Date : 2022-08-25 , DOI: 10.1109/tte.2022.3200994
Mingyuan Chang 1 , Xiaoru Wang 1 , Xiaoqin Lv 1 , Rui Kong 1
Affiliation  

The traction power system is supplied by three-phase power grids in China, forming an asymmetrical system. However, current research on wideband-oscillation analysis of the traction power supply system assumes that vehicles in a feeding section are supplied by a single-phase ideal voltage source. Meanwhile, the existing vehicle impedance models are inapplicable for the stability analysis of this asymmetrical system. In this article, a single-input and single-output impedance of the vehicle is derived and the corresponding admittance can be directly used to form the system node admittance matrix and to analyze system stability by the modal analysis. The node admittance matrix of this asymmetrical system is established by putting the derived vehicles’ admittance into the node admittance matrix of two feeding section traction networks, the traction transformer and the equivalent circuit of power grids. Then, the modal analysis method is used to obtain the low-frequency oscillation modes of this asymmetrical system and to analyze the sensitivities of different parameters to the oscillation mode. The interaction between the two feeding sections and their interaction with power grids is studied. Finally, the correctness of theoretical findings is verified by simulation in MATLAB/Simulink and experiment in Starsim/HIL.

中文翻译:

连接到电网的不对称牵引电力系统的建模和低频振荡分析

我国牵引电力系统由三相电网供电,形成不对称系统。然而,目前对牵引供电系统宽带振荡分析的研究假设馈电部分的车辆由单相理想电压源供电。同时,现有的车辆阻抗模型不适用于该非对称系统的稳定性分析。本文推导了整车的单输入单输出阻抗,可以直接利用对应的导纳构成系统节点导纳矩阵,通过模态分析对系统稳定性进行分析。该非对称系统的节点导纳矩阵是通过将导出的车辆导纳放入两个馈电段牵引网络的节点导纳矩阵中建立的,牵引变压器和电网的等效电路。然后,采用模态分析方法得到该非对称系统的低频振荡模态,分析不同参数对振荡模态的敏感性。研究了两个馈电部分之间的相互作用及其与电网的相互作用。最后通过MATLAB/Simulink仿真和Starsim/HIL实验验证了理论研究结果的正确性。
更新日期:2022-08-25
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