Publication

Overload Surge Event in a Pumped-Storage Power Plant

François Avellan, Christophe Nicolet
2006
Conference Papers

Abstract

At full load, pump-turbines operating in generating mode may experience a cylindrical cavitation vortex rope caused by the swirling flow in the draft tube cone. Under certain conditions, this vortex rope initiates both pressure and power oscillations. The hydro-acoustic analysis of a pumped storage plant experiencing such pressure and power oscillation is presented to illustrate the self induced oscillation nature of the observed event. The main physical parameters of the system stability are first introduced using a simplified 1D mathematical model of the full-load vortex rope. Then, a modal analysis of the full hydraulic circuit is performed to determine the stability domain of the plant as a function of the vortex rope parameters. Finally, a full hydro-acoustic SIMSEN model of the plant, validated with existing experimental data, is used to simulate the time sequence of the pressure surge event, and the cause of this pressure surge event is clearly identified.

Official source

https://infoscience.epfl.ch/entities/publication/6d0a6ef6-9abd-4167-9428-2b1cdf32d77b

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François Avellan, Christophe Nicolet
2006
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6d0a6ef6-9abd-4167-9428-2b1cdf32d77b

About this result

Related concepts (29)

Pump

A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Mechanical pumps serve in a wide range of applications such as pumping water from wells, aquarium filtering, pond filtering and aeration, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural gas or for operating cooling towers and other components of heating, ventilation and air conditioning systems.

BIBO stability

In signal processing, specifically control theory, bounded-input, bounded-output (BIBO) stability is a form of stability for signals and systems that take inputs. If a system is BIBO stable, then the output will be bounded for every input to the system that is bounded. A signal is bounded if there is a finite value such that the signal magnitude never exceeds , that is For discrete-time signals: For continuous-time signals: For a continuous time linear time-invariant (LTI) system, the condition for BIBO stability is that the impulse response, , be absolutely integrable, i.

Pumped-storage hydroelectricity

Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing. The method stores energy in the form of gravitational potential energy of water, pumped from a lower elevation reservoir to a higher elevation. Low-cost surplus off-peak electric power is typically used to run the pumps. During periods of high electrical demand, the stored water is released through turbines to produce electric power.

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