Combining electric energy storage and deep-lake degassing by means of pumped hydropower

Nzotcha, Urbain; Nsangou, Jean Calvin; Kenfack, Joseph; Ngohe-Ekam, Paul Salomon; Hamandjoda, Oumarou; Bignom, Blaise

doi:10.1016/j.apenergy.2021.117839

Cited by 11 publications

(3 citation statements)

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“…Furthermore, this research could be expanded based on the following points: (1) The interaction mechanism of the water level oscillation in the UST, the water level oscillation in the DST and the unit oscillation could be further investigated. (2) This research focused on analyzing the stability of a HPUDSC based on theoretical analysis and numerical simulation. Further analysis of the frequency characteristics of a HPUDSC will be conducted.…”

Section: Discussionmentioning

confidence: 99%

“…Hydropower plays a vital role in realizing sustainable development and improving the energy mix [1][2][3]. With the development of modern water conservancy and hydropower technology, hydropower plants are developing towards the direction of high head and large capacity [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Aimed at the gaps in previous studies, this paper makes the following main innovations: (1) A nonlinear dynamic model of a HPUDSC system is built. (2) The operational stability of a HPUDSC system is studied based on Hopf bifurcation theory and numerical simulation. (3) The influencing factors of stability in the HPUDSC system are revealed.…”

Section: Introductionmentioning

confidence: 99%

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Operational Stability of Hydropower Plant with Upstream and Downstream Surge Chambers during Small Load Disturbance

Liu

Guo

et al. 2023

Energies

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A surge chamber is a common pressure reduction facility in a hydropower plant. Owing to large flow inertia in the upstream headrace tunnel and downstream tailrace tunnel, a hydropower plant with upstream and downstream surge chambers (HPUDSC) was adopted. This paper aimed to investigate the operational stability and nonlinear dynamic behavior of a HPUDSC. Firstly, a nonlinear dynamic model of the HPUDSC system was built. Subsequently, the operational stability and nonlinear dynamic behavior of the HPUDSC system were studied based on Hopf bifurcation theory and numerical simulation. Finally, the influencing factors of stability of the HPUDSC system were investigated. The results indicated the nonlinear HPUDSC system occurred at subcritical Hopf bifurcation, and the stability domain was located above the bifurcation curve, which provided a basis for the tuning of the governor parameters during operation. The dominant factors of stability and dynamic behavior of the HPUDSC system were flow inertia and head loss of the headrace tunnel and the area of the upstream surge chamber. Either increasing the head loss of the headrace tunnel and area of the upstream surge chamber or decreasing the flow inertia of the headrace tunnel could improve the operational stability of the HPUDSC. The proposed conclusions are of crucial engineering value for the stable operation of a HPUDSC.

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Section: Discussionmentioning

confidence: 99%