Hydraulic coupling vibration characteristics and control of hydropower station with upstream and downstream surge tanks

Wu, Fulin; Guo, Wencheng; Fu, Shanlin; Qu, Fangle

doi:10.1016/j.seta.2021.101842

Cited by 2 publications

(3 citation statements)

References 23 publications

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“…The great flow inertia of SLHT and huge surge tank increase the difficulty of optimization of hydraulic parameters. The coupling effect between pipelines and surge tank leads to the interaction of different hydraulic parameters 13–15 . The SLHT and its coupling with surge tank make the transient processes of HSSLHT significantly different from those with short headrace tunnel.…”

Section: Introductionmentioning

confidence: 99%

“…The coupling effect between pipelines and surge tank leads to the interaction of different hydraulic parameters. [13][14][15] The SLHT and its coupling with surge tank make the transient processes of HSSLHT significantly different from those with short headrace tunnel. Therefore, the optimization of hydraulic parameters for pipeline system of HSSLHT cannot indiscriminately use the results and methods of that with short headrace tunnel.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of hydraulic parameters for pipeline system of hydropower station with super long headrace tunnel based on mayfly algorithm considering operational scenarios

Wang,

Guo

2024

Energy Science & Engineering

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This paper studies the optimization of hydraulic parameters for pipeline system of hydropower station with super long headrace tunnel (HSSLHT) based on mayfly algorithm considering operational scenarios. Firstly, the state equation of HSSLHT under load disturbance is derived. The optimization design of hydraulic parameters for pipeline system based on mayfly algorithm is proposed. Then, the optimization of hydraulic parameters is conducted and analyzed. Finally, the effects of pipeline diameters and transfer coefficients of turbines on the optimization of hydraulic parameters for pipeline systems are revealed. The results show that the optimization of hydraulic parameters for pipeline system is a multiobjective problem, and the several objective functions exhibit significant conflicts. Compared to the firefly algorithm and genetic algorithm, the objective function under mayfly algorithm is improved by 14.7% and 5.1%, respectively. The mayfly algorithm can make the hydraulic parameters for the pipeline system reach the Pareto optimal solution under both load decrease condition and load increase condition. The diameter of penstock has an obvious influence on the robustness of dynamic performance of HSSLHT. When the diameter of penstock increases by 30%, the robustness of HSSLHT becomes worse and the robustness index deteriorates by 57%. The reason is that the flow inertia of penstock becomes smaller with the increase of diameter, and the flow inertia of penstock is favorable for resisting disturbance of HSSLHT. The coefficient of throttled orifice head loss and the lengths and head losses of headrace tunnel and penstock are the key hydraulic parameters for matching the operation of HSSLHT.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of hydraulic parameters for pipeline system of hydropower station with super long headrace tunnel based on mayfly algorithm considering operational scenarios

Wang,

Guo

2024

Energy Science & Engineering

Self Cite

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“…Cao et al [25] studied the dynamic quality of HPUDSC, and proposed that reducing the distance between the USC and the DSC could reduce the amplitude of the unit speed oscillation. Wu et al [26] applied the transfer function method to analyze the coupled oscillation characteristics of HPUDSC, and proposed the concepts of coupled oscillation domain and hydraulic resonance domain. From the aforementioned references, the linear model is normally used to analyze the operational stability of HPUDSC, so that the nonlinear characteristic of head loss is ignored.…”

Section: Introductionmentioning

confidence: 99%

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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Hydraulic coupling vibration characteristics and control of hydropower station with upstream and downstream surge tanks

Cited by 2 publications

References 23 publications

Optimization of hydraulic parameters for pipeline system of hydropower station with super long headrace tunnel based on mayfly algorithm considering operational scenarios

Optimization of hydraulic parameters for pipeline system of hydropower station with super long headrace tunnel based on mayfly algorithm considering operational scenarios

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

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