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Coordinated control strategy for cascaded Pelton turbine hydropower stations with regulating reservoir considering system parameter uncertainty: Discharge matching and regulation stability

Author

Listed:
  • Liu, Yi
  • Li, Jinyang
  • Zhang, Jian
  • Liao, Weijia
  • Chen, Sheng

Abstract

Cascaded Pelton turbine hydropower stations with regulating reservoirs (CPHR) are required to maintain inter-station discharge matching because of limited regulating reservoir storage. However, the discharge matching characteristics considering parameter uncertainties is not fully elucidated, and effective coordinated operation control strategies are still lacking. This study first quantitatively analyzed the effects of the uncertainties of the diversion tunnel head loss and turbine efficiency on inter-station discharge matching. Subsequently, a coordinated control strategy for the CPHR was proposed. The first-stage station (FS) employed a PI control scheme using the total power deviation as feedback, while the second-stage station (SS) adopted a dual-PI control scheme using both the total power and regulating reservoir water level deviations as feedback. The stability mechanism and dynamic response characteristics of the CPHR were revealed. Finally, the effects of the control parameters on the system stability and dynamic characteristics were clarified. The results showed that the independent power regulation of each station led to a high probability of substantial discharge deviation between stations. The proposed strategy ensured discharge matching, zero steady-state error recovery of the regulating reservoir water level, and stable power regulation. The dynamic response was jointly influenced by high- and low-frequency oscillations. The high-frequency oscillation dominated the initial power response and decayed rapidly, whereas the low-frequency oscillation was induced by the regulating reservoir water level fluctuations and exhibited a small-amplitude tail wave in the power response that decayed slowly. Overall, the findings provide significant engineering value for ensuring discharge matching and stable operation of the CPHR.

Suggested Citation

  • Liu, Yi & Li, Jinyang & Zhang, Jian & Liao, Weijia & Chen, Sheng, 2026. "Coordinated control strategy for cascaded Pelton turbine hydropower stations with regulating reservoir considering system parameter uncertainty: Discharge matching and regulation stability," Energy, Elsevier, vol. 360(C).
    • Handle: RePEc:eee:energy:v:360:y:2026:i:c:s0360544226017779
    DOI: 10.1016/j.energy.2026.141670
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