Low frequency oscillation suppression in train-grid system based on co-phase supply unit

IF 4.6 2区计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS

Control Engineering Practice Pub Date : 2025-08-11 DOI:10.1016/j.conengprac.2025.106527

Feifan Liu , Lei Ma , Fulin Zhou , Yongyi Liao , Kang Li

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引用次数: 0

Abstract

Low-frequency oscillations (LFOs) pose a significant threat to the safe and efficient operation of electrified railways. This paper proposes a novel solution for LFO suppression based on a single-phase back-to-back converter namely co-phase supply unit (CSU), which simultaneously achieves continuous power supply and negative sequence compensation for electrified railways. First, a control framework for the CSU is proposed. Based on this, the dq admittance model of the CSU is derived. Then, the specific admittance for each channel is obtainable by model decomposition. With this, the impact of each parameter on the CSU admittance characteristics is clearly expressed, which can guide the parameter adjustments. To further explore the coupling between the train-grid system and the CSU, the dq admittance model is transformed into a single-input single-output system. The stability analysis confirm that the CSU can provide positive conductance in the low frequency range, which eliminates the negative conductance of the train-grid system, thus improving the system stability. Simulation and hardware-in-the-loop experiments both verified the effectiveness of CSU in LFO suppression.

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基于共相供电单元的轨网系统低频振荡抑制

低频振荡对电气化铁路的安全高效运行构成重大威胁。本文提出了一种基于单相背对背变换器的LFO抑制新方案，即共相供电单元（CSU），它同时实现了电气化铁路的连续供电和负序补偿。首先，提出了CSU的控制框架。在此基础上，推导了CSU的dq导纳模型。然后，通过模型分解得到各通道的具体导纳。这样，就可以清楚地表达出各个参数对CSU导纳特性的影响，从而指导参数的调整。为了进一步探索列车电网系统与CSU之间的耦合，将dq导纳模型转换为单输入单输出系统。稳定性分析证实，CSU可以在低频范围内提供正电导，消除了列车网系统的负电导，从而提高了系统的稳定性。仿真和硬件在环实验均验证了CSU抑制LFO的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Control Engineering Practice 工程技术-工程：电子与电气

CiteScore

9.20

自引率

12.20%

发文量

183

审稿时长

44 days

期刊介绍： Control Engineering Practice strives to meet the needs of industrial practitioners and industrially related academics and researchers. It publishes papers which illustrate the direct application of control theory and its supporting tools in all possible areas of automation. As a result, the journal only contains papers which can be considered to have made significant contributions to the application of advanced control techniques. It is normally expected that practical results should be included, but where simulation only studies are available, it is necessary to demonstrate that the simulation model is representative of a genuine application. Strictly theoretical papers will find a more appropriate home in Control Engineering Practice''s sister publication, Automatica. It is also expected that papers are innovative with respect to the state of the art and are sufficiently detailed for a reader to be able to duplicate the main results of the paper (supplementary material, including datasets, tables, code and any relevant interactive material can be made available and downloaded from the website). The benefits of the presented methods must be made very clear and the new techniques must be compared and contrasted with results obtained using existing methods. Moreover, a thorough analysis of failures that may happen in the design process and implementation can also be part of the paper. The scope of Control Engineering Practice matches the activities of IFAC. Papers demonstrating the contribution of automation and control in improving the performance, quality, productivity, sustainability, resource and energy efficiency, and the manageability of systems and processes for the benefit of mankind and are relevant to industrial practitioners are most welcome.