Publications by Stefan Keller | EPFL Graph Search

Large low-speed hydro-generators-unbalanced magnetic pulls and additional damper losses in eccentricity conditions

Jean-Jacques Simond, Mai Tu Xuan, Stefan Keller, Alexander Schwery

2007

Hardware-in-the-Loop Simulation Software for regulator tests and optimization

Jean-Jacques Simond, Philippe Allenbach, Stefan Keller, Antoine Béguin

This paper presents a real-time extension, called SIMSEN-RT, of the simulation software SIMSEN. SIMSEN-RT allows carrying out hardware-in-the-loop (HIL) simulations of power systems using hardware regulators. It can therefore be used to fine-tune regulator ...

2007

Large low speed hydrogenerators - UMP and additional damper losses in eccentricity conditions

Stefan Keller

The present thesis is an advanced contribution to the design process of large synchronous generators with high number of poles. It proposes two original contributions, the first one allowing a very precise prediction of the no-load voltage and of the no-lo ...

EPFL2007

Computation of the no-load voltage waveform of laminated salient-pole synchronous generators

Jean-Jacques Simond, Mai Tu Xuan, Stefan Keller

This paper presents a combined analytical and finite-element (FE) method for computation of the no-load voltage waveform of laminated salient-pole synchronous generators. The described method takes into account saturation effects as well as the damper bar ...

2006

A Novel Air-Gap Monitoring System For Large Low Speed Hydro-Generators

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter, Stefan Keller

This paper describes a novel and patented air-gap monitoring system for large low speed synchronous hydro-generators. This new system is based on inductive sensors, it is able to measure in real time a static or a dynamic rotor eccentricity, a stator or a ...

2006

An Original Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter, Stefan Keller

2006

Prediction of the No-Load Voltage Waveform of Laminated Salient-Pole Synchronous Generators

Jean-Jacques Simond, Mai Tu Xuan, Stefan Keller

This paper presents a combined analytical and FEM method for prediction of the no-load voltage waveform of laminated salient-pole synchronous generators. The described method takes into account saturation effects as well as the damper bar currents due to t ...

2005

Synchronous Generator No-Load Voltage Prediction using a Combined Analytical and FEM Approach

Jean-Jacques Simond, Mai Tu Xuan, Stefan Keller

A combined analytical and FEM method for prediction of the no-load voltage waveform of laminated salient pole synchronous generators is presented in this article. Very precise prediction of the no-load voltage, including saturation effects as well as the e ...

2005