IDEAS home Printed from https://ideas.repec.org/a/eee/renene/v258y2026ics0960148125025145.html

Frequency stability analysis and quantitative assessment of support capability of islanded high-voltage direct current sending terminal for hydropower plant

Author

Listed:
  • Zhu, Zhiwei
  • Tan, Xiaoqiang
  • Lu, Xueding
  • Wang, He
  • Xu, Rongli
  • Liu, Dong
  • Li, Chaoshun

Abstract

Frequency stability is crucial for the safe and stable operation of power grids. This paper examines the stability and dynamic characteristics of an islanded hydropower plant with frequency limit control (FLC) at high-voltage direct current (HVDC) sending terminal. Firstly, a mathematical model of the hydro-turbine governing system (HTGS) with two units sharing a tailrace tunnel is established. The stability of HTGS with and without FLC is then investigated, with theoretical analysis verified through numerical simulation. Additionally, the mechanism of the FLC as well as the influence law of the FLC parameters on the stability and dynamic characteristics of the HTGS are revealed from the perspectives of energy conversion and system damping changes. Finally, the FLC supporting capacity (FLCSC) is innovatively proposed to quantify FLC support for frequency recovery. Results indicate that FLC significantly enhance system stability, improve the regulation quality of the frequency recovery, and ensure the safe and stable operation of the system from both electrical and hydraulic perspectives. FLC shortens the rotor kinetic energy conversion process of the hydropower unit and increases system damping to achieve fast frequency recovery. The proposed FLCSC effectively quantifies the degree of FLC support for frequency restoration at the sending terminal.

Suggested Citation

  • Zhu, Zhiwei & Tan, Xiaoqiang & Lu, Xueding & Wang, He & Xu, Rongli & Liu, Dong & Li, Chaoshun, 2026. "Frequency stability analysis and quantitative assessment of support capability of islanded high-voltage direct current sending terminal for hydropower plant," Renewable Energy, Elsevier, vol. 258(C).
    • Handle: RePEc:eee:renene:v:258:y:2026:i:c:s0960148125025145
    DOI: 10.1016/j.renene.2025.124850
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0960148125025145
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.renene.2025.124850?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

    for a different version of it.

    More about this item

    Keywords

    ;
    ;
    ;
    ;

    Statistics

    Access and download statistics

    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:renene:v:258:y:2026:i:c:s0960148125025145. 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/renewable-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.