Low-Frequency Oscillation Analysis of Train-Network System with Different Types of Trains Connected

2021 IEEE 16th Conference on Industrial Electronics and Applications (ICIEA) Pub Date : 2021-08-01 DOI:10.1109/ICIEA51954.2021.9516148

Rui Kong, Xiaoqin Lv, Xiaoru Wang

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引用次数: 1

Abstract

The low-frequency oscillation (LFO) of electrified railway is largely related to the grid-side converters of the train. The mixed operation of different types of trains with different control methods and parameters of the grid-side converters brings new challenges to system stability. In fact, Dq-domain control (DQDC) and phase-domain control (PDC) are frequently used in train grid-side converters. This paper proposes a dq impedance modeling method of PDC train, which is in the same domain as the model of DQDC train, so that a unified train impedance model (UTIM) for the trains with these two control strategies can be established in dq-domain. Then, the generalized Nyquist stability criterion (GNSC) is used to study the LFO. The influence of the parameter on the system stability in the case of two types of trains connected is revealed, and will be different from the system with only one type of trains connected. Finally, time-domain simulations verify the correctness of the theoretical analyzing conclusions.

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不同类型列车连接的列车网络系统低频振荡分析

电气化铁路的低频振荡在很大程度上与列车的电网侧变流器有关。不同类型的列车采用不同的控制方法和电网侧变流器的参数进行混合运行，对系统的稳定性提出了新的挑战。事实上，dq域控制(DQDC)和相域控制(PDC)是列车电网侧变流器中常用的控制方法。本文提出了一种PDC列车的dq阻抗建模方法，该方法与DQDC列车模型处于同一域，从而在dq域中建立了采用这两种控制策略的列车的统一列车阻抗模型(UTIM)。然后，利用广义Nyquist稳定性判据(GNSC)研究LFO。揭示了两种列车连接情况下参数对系统稳定性的影响，并将不同于只有一种列车连接情况下的系统稳定性。最后，通过时域仿真验证了理论分析结论的正确性。

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2021 IEEE 16th Conference on Industrial Electronics and Applications (ICIEA)

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