As ac electric railways have various problems (e.g., power quality issues, complex catenary networks, limited supply region, and passing neutral section), the medium-voltage direct current (MVdc) railway electrification system (RES) may be a potential alternative electric railway mode and can be freely accessed to the renewable energy systems. However, some instability issues may be aroused due to the interaction between flexible MVdc RES and electronic-based dc–dc equipment. In this paper, a comprehensive small-signal impedance model, combining a photovoltaic (PV) plant and an MVdc RES, is performed, while available electric variables and control parameters are taken into consideration. Then, a novel passivity-based stability criterion (PBSC) is introduced to determine the instability issue about associate influential factors, including proportional and integral parameters of traction substation and PV converters, the power of train converters, and the dc catenary length. A virtual impedance control scheme is designed to stabilize the system. The experimental results demonstrate that the PBSC can identify the instability in the MVdc RES. The results also match well and support the conclusions obtained.


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    Title :

    Stability Analysis of PV Plant-Tied MVdc Railway Electrification System


    Contributors:
    Zhu, Xiaojuan (author) / Hu, Haitao (author) / Tao, Haidong (author) / He, Zhengyou (author)


    Publication date :

    2019-03-01


    Size :

    4704439 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Railway electrification

    Denhardt, A. | Engineering Index Backfile | 1953


    Railway electrification

    Fairburn, C.E. | Engineering Index Backfile | 1937


    Railway electrification

    Smith, R.T. | Engineering Index Backfile | 1930


    Railway electrification

    Raven, Vincent | Engineering Index Backfile | 1923