Harmonic stability analysis of single-phase converters in electric multiple units based on an impedance model with harmonic linearization

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-06-02 DOI:10.1049/els2.12079

Ting Li, Jiawei Liu, Xunjun Chen, Jing Gou, Heng Zhou, Siqi Wu, Zhigang Liu

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Abstract

Low-frequency oscillation, harmonic oscillation and harmonic instability issues in railway vehicle-grid systems pose challenges to the system stability and safe operation. Previous studies constructed the linear time-invariant impedance model of vehicle-grid system, which ignored the internal frequency coupling and loss of model accuracy. To fill this gap, the impedance modelling method based on the harmonic linearisation method of the vehicle-grid system is proposed. The derived model provides a clear physical insight into the harmonic coupling relations between ac and dc variables and improves the model accuracy. Then, a systematic analysis of harmonic stability in the railway vehicle-grid system is analysed based on the proposed model. The electrical and control parameters on system stability at the frequencies above and below the fundamental frequency are summarised. The mechanisms of these oscillation issues in railway vehicle-grid systems are then discussed. Finally, the model accuracy and stability analysis results are verified by the frequency scan method and hardware-in-the-loop results.

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基于谐波线性化阻抗模型的电力动车组单相变换器谐波稳定性分析

轨道车网系统的低频振荡、谐波振荡和谐波失稳问题对系统的稳定性和安全运行提出了挑战。以往的研究都是建立车辆-电网系统的线性定常阻抗模型，忽略了系统内部的频率耦合和模型精度的损失。为了填补这一空白，提出了基于车网系统谐波线性化方法的阻抗建模方法。推导出的模型对交直流变量之间的谐波耦合关系提供了清晰的物理洞察，提高了模型的精度。在此基础上，对车网系统的谐波稳定性进行了系统分析。总结了在基频以上和低于基频的频率下，电气和控制参数对系统稳定性的影响。然后讨论了轨道车辆-网格系统中这些振荡问题的机理。最后，通过频率扫描法和硬件在环结果验证了模型的精度和稳定性分析结果。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.