Christophe Nicolet

Cette personne a quitté l’EPFL

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Publications associées (48)

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One-Dimensional Analysis of Full Load Draft Tube Surge

François Avellan, Mohamed Farhat, Christophe Nicolet

One-dimensional stability analysis of a hydraulic system composed of a penstock, a runner, and a draft tube was carried out to determine the cause of the full load draft tube surge. It is assumed that the cavity volume at the runner exit is a function of t ...

2008

Increasing Wind Power Penetration in Autonomous Power Systems through No-Flow Operation of Pelton Turbines

Christophe Nicolet, Basile Kawkabani

The integration of wind power in power systems results in a reduction in greenhouse gas emissions. Thus, it has a positive environmental impact. However, the operation of these power systems becomes increasingly complex, owing mainly to random behaviour of ...

Pergamon-Elsevier Science Ltd2014

Assessment of Power Swings in Hydropower Plants Through High-Order Modeling and Eigenanalysis

Pedro Camilo de Oliveira e Silva, Christophe Nicolet, Basile Kawkabani

POWER plants are subject to introduce disturbances in the power grid, resulting from interactions with the dynamical behavior of the energy source subsystem. In the case of hydropower plants when used to compensate for variations of power generation and co ...

2017

Hydropower Plants Frequency Regulation Depending on Upper Reservoir Water Level

Christophe Nicolet, Philippe Allenbach

This paper presents a novel method of hydro power plant operation, based on the control of the injectors’ or wicked gates opening time as a function of the upper reservoir level. In this way, a faster power injection, depending on the current water level o ...

2019

One-dimensional analysis of full load draft tube surge

François Avellan, Mohamed Farhat, Christophe Nicolet

A previous report by the present authors [1] clarified the diffuser effect of the draft tube and the effects of swirl in the runner downstream on the hydraulic instabilities in power generation plants. The present study was intended to study the effect of ...

International Association For Hydraulic Research2008

Modeling of Unsteady Friction and Viscoelastic Damping in Piping Systems

François Avellan, Andres Müller, Christophe Nicolet, Christian Landry

In real systems, the phenomena, such as pipe-wall viscoelasticity, unsteady friction or fluid structure interaction induce additional damping and dispersion of transient pressure waves than that defined by classical waterhammer. In this paper, unsteady fri ...

International Association For Hydraulic Research2012

Optimization of the Start-up Time of a Variable Speed Pump-Turbine Unit in Pumping Mode

Jean-Jacques Simond, Christophe Nicolet, Basile Kawkabani, Yves Pannatier

This paper presents the start-up and synchronization procedures of large variable- speed pump-turbine units in pumping mode. These procedures applied to a doubly-fed induction motor-generator with three-level voltage source inverters VSI cascade in the rot ...

2012

Transient Behavior of Variable Speed Pump-Turbine Units

François Avellan, Jean-Jacques Simond, Christophe Nicolet, Basile Kawkabani, Alexander Schwery, Yves Pannatier

2008