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Article

Optimization of Pump Turbine Closing Operation to Minimize Water Hammer and Pulsating Pressures During Load Rejection

1
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
2
School of Civil, Environmental & Mining Engineering, the University of Adelaide, Adelaide SA 5005, Australia
*
Author to whom correspondence should be addressed.
Energies 2020, 13(4), 1000; https://doi.org/10.3390/en13041000
Received: 15 January 2020 / Revised: 20 February 2020 / Accepted: 21 February 2020 / Published: 23 February 2020
(This article belongs to the Special Issue Hydrokinetic Energy Conversion: Technology, Research, and Outlook)
In load rejection transitional processes in pumped-storage plants (PSPs), the process of closing pump turbines, including guide vane (GVCS) and ball valve closing schemes (BVCS), is crucial for controlling pulsating pressures and water hammer. Extreme pressures generated during the load rejection process may result in fatigue damage to turbines, and cracks or even bursts in the penstocks. In this study, the closing schemes for pump turbine guide vanes and ball valves are optimized to minimize water hammer and pulsating pressures. A model is first developed to simulate water hammer pressures and to estimate pulsating pressures at the spiral case and draft tube of a pump turbine. This is combined with genetic algorithms (GA) or non-dominated sorting genetic algorithm II (NSGA-II) to realize single- or multi-objective optimizations. To increase the applicability of the optimized result to different scenarios, the optimization model is further extended by considering two different load-rejection scenarios: full load-rejection of one pump versus two pump turbines, simultaneously. The fuzzy membership degree method provides the best compromise solution for the attained Pareto solutions set in the multi-objective optimization. Employing these optimization models, robust closing schemes can be developed for guide vanes and ball valves under various design requirements. View Full-Text
Keywords: pumped-storage power plant; pump turbine; hydraulic transient; pulsating pressure; evolutionary algorithm; fuzzy membership degree pumped-storage power plant; pump turbine; hydraulic transient; pulsating pressure; evolutionary algorithm; fuzzy membership degree
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MDPI and ACS Style

Ye, J.; Zeng, W.; Zhao, Z.; Yang, J.; Yang, J. Optimization of Pump Turbine Closing Operation to Minimize Water Hammer and Pulsating Pressures During Load Rejection. Energies 2020, 13, 1000. https://doi.org/10.3390/en13041000

AMA Style

Ye J, Zeng W, Zhao Z, Yang J, Yang J. Optimization of Pump Turbine Closing Operation to Minimize Water Hammer and Pulsating Pressures During Load Rejection. Energies. 2020; 13(4):1000. https://doi.org/10.3390/en13041000

Chicago/Turabian Style

Ye, Jiawei, Wei Zeng, Zhigao Zhao, Jiebin Yang, and Jiandong Yang. 2020. "Optimization of Pump Turbine Closing Operation to Minimize Water Hammer and Pulsating Pressures During Load Rejection" Energies 13, no. 4: 1000. https://doi.org/10.3390/en13041000

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