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Influence of water hammer effect on low frequency oscillation of grid-connected hydropower station system

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  • Liu, Zhe
  • Yu, Xiaodong
  • Pérez-Díaz, Juan I.
  • Liu, Yi
  • Martínez-Lucas, Guillermo

Abstract

This paper aims to investigate the influence of the water hammer effect on low-frequency oscillations (LFO) in power systems, mainly quantifying and revealing the characteristics of hydraulic damping of LFO. The models of the grid-connected hydropower stations considering the water column elasticity (elastic model) and without considering it (rigid model) are respectively established and used as time domain validation models. The corresponding analytical formulas for the mechanical damping torque coefficients (MDTC) are derived to obtain the system's damping frequency characteristics. Finally, a method for quantifying the nonlinear system's damping is proposed. The results show that due to the effect of the water hammer wave, the system's damping frequency characteristics have changed, and damping peaks and valleys appear. The corresponding frequencies are determined by the frequency of the water hammer wave. The system has a critical oscillation frequency. When the frequency of LFO is below the critical frequency, water column elasticity must be considered. When the frequency of LFO is consistent with the frequency of the water hammer wave, the negative damping reaches its maximum. Finally, the proposed quantitative method was used to clarify the influence of the water hammer effect on the system's damping characteristics while considering nonlinear head loss.

Suggested Citation

  • Liu, Zhe & Yu, Xiaodong & Pérez-Díaz, Juan I. & Liu, Yi & Martínez-Lucas, Guillermo, 2023. "Influence of water hammer effect on low frequency oscillation of grid-connected hydropower station system," Renewable Energy, Elsevier, vol. 219(P2).
    • Handle: RePEc:eee:renene:v:219:y:2023:i:p2:s0960148123014453
    DOI: 10.1016/j.renene.2023.119530
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    References listed on IDEAS

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