IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v292y2024ics0360544224003505.html
   My bibliography  Save this article

Analysis of transient pressure of pump-turbine during load rejection based on a multi-step extraction method

Author

Listed:
  • Zhou, Tingxin
  • Yu, Xiaodong
  • Zhang, Jian
  • Xu, Hui

Abstract

During the load rejection condition of the pump-turbines, the S-shaped characteristic would lead to intense pressure pulsations, thus threatening the safe operation of the pumped storage plants (PSPs). Extracting water harmer pressure (WHP) and pulsating pressure (PP) from the measured pressure signals is of great engineering significance. As a result, this study proposes a novel multi-step extraction framework for the WHP. First, a theoretical method for extracting WHP is developed by analyzing the transient properties of the pressure pulsations. Subsequently, a denoising strategy combining improved variational mode decomposition (IVMD) and multi-level wavelet denoising (MWD) is presented to reduce noise interference. The proposed IVMD is used to reduce wideband noise, and the MWD method is developed to reduce narrow-band noise within the IVMD decompositions. Finally, the proposed method's effectiveness is verified using spiral case inlet and draft tube inlet pressure signals acquired from a prototype pump-turbine of 375 MW. The results show that the proposed denoising method can effectively reduce noise interference and accurately extract WHP. This study provides an innovative and theoretically-based method for extracting WHP and PP, which has important engineering significance for the safe operation of PSPs.

Suggested Citation

  • Zhou, Tingxin & Yu, Xiaodong & Zhang, Jian & Xu, Hui, 2024. "Analysis of transient pressure of pump-turbine during load rejection based on a multi-step extraction method," Energy, Elsevier, vol. 292(C).
    • Handle: RePEc:eee:energy:v:292:y:2024:i:c:s0360544224003505
    DOI: 10.1016/j.energy.2024.130578
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544224003505
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2024.130578?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:energy:v:292:y:2024:i:c:s0360544224003505. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.