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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
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    References listed on IDEAS

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