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Transient analysis of hydropower station with pressure-regulating valves considering effects of hysteresis and buffering

Author

Listed:
  • Hu, Chao
  • Zhang, Jian
  • Wu, Tong
  • Liu, Yi
  • Xu, Minjie
  • Chen, Sheng

Abstract

The large-scale integration of intermittent renewable energy into grids can induce violent water-hammer effects in hydropower systems. The pressure-regulating valve (PRV) is a cost-saving device, whose optimized operation can significantly reduce the water-hammer pressure. Traditional hydraulic transition calculations typically employ a linear fitting rule (LFR) to model PRVs but fail to account for their inherent hysteresis and buffering characteristics. To address this limitation, a novel method that applies the Laplace transform fitting rule (LTFR) is proposed to simulate the PRV action characteristics, enabling flexible adjustment of hysteresis and buffering times Ty1 – Ty4. A mathematical model of a hydropower station with pressure-regulating valves (HSPRV) is developed and validated using field data. The performance of LTFR is then evaluated through comparative analysis with LFR. Finally, the effects of hysteresis and buffering on regulation guarantee parameters during load rejection conditions (LRCs) and regulation qualities during hydraulic disturbance conditions (HDCs) are investigated. Results show that LTFR yields a maximum spiral case inlet pressure (SCIP) of 80.78 m, which is 7.51 % higher than the value obtained using LFR. Increases in Ty1 or Ty2 worsen the maximum SCIP during LRCs and amplify the power output oscillation amplitude during HDCs, highlighting the risks of overlooking hysteresis and buffering in HSPRV modeling. This study introduces a validated method for fitting PRV action law and offers theoretical insights into enhancing the operational safety of hydropower systems.

Suggested Citation

  • Hu, Chao & Zhang, Jian & Wu, Tong & Liu, Yi & Xu, Minjie & Chen, Sheng, 2025. "Transient analysis of hydropower station with pressure-regulating valves considering effects of hysteresis and buffering," Energy, Elsevier, vol. 337(C).
    • Handle: RePEc:eee:energy:v:337:y:2025:i:c:s0360544225041829
    DOI: 10.1016/j.energy.2025.138540
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