Recherche

Afficher tous les résultats pour

Accueil

Personne

Alfred Rufer

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (215)

Hybrid Energy Storage System Based on Compressed Air and Super-Capacitors with Maximum Efficiency Point Tracking (MEPT)

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a hybrid energy storage system mainly based on Compressed Air, where the storage and withdrawal of energy are done within maximum efficiency conditions. As these maximum efficiency conditions impose the level of converted power, an inte ...

2006

High Efficient Interleaved Multi-channel dc/dc Converter Dedicated to Mobile Applications

Alfred Rufer, Blaise Destraz, Yannick Louvrier

In the transportation field, the empty weight of the vehicle has to be as light as possible in order to have the highest energetic efficiency. For onboard storage electrical systems, dc/dc converters are usually used to control the power flows in the vehic ...

2006

A new interleaved multi-channel DC/DC converter specially dedicated to low voltage, high current applications

Alfred Rufer, Blaise Destraz, Philippe Barrade

Making transportation systems more energy efficient is one of the key challenge in this century. This paper presents a solution for increasing the efficiency of an electrical scooter by adding a supercapacitive energy storage in parallel to the original ba ...

2006

Stockage d'énergie par air comprimé: un défi pour les circuits d'électronique de puissance

Alfred Rufer, Sylvain Lemofouet-Gatsi

Le principe de la compression de l’air peut être utilisé pour le stockage de l’énergie électrique, avec des performances très variables du point de vue du rendement énergétique. Dans le domaine des phénomènes thermodynamiques impliqués, différentes approch ...

2006

PEMFC system efficiency optimisation through model based control strategies

Félix Grasser, Alfred Rufer

When running a fuel cell system in load following mode, several operating points (i.e. a combination of gas flow rates, pressures, humidities, temperatures and current density) can provide the required net power. Typically, only one of those operating poin ...

2006

Modélisation d'un système de stockage de type électrolyseur réversible au vanadium

Alfred Rufer, Christian Blanc

L’apparition de nouveaux concepts de production décentralisée d’électricité et le développement des sources renouvelables suscitent un vif intérêt pour les techniques de stockage de l’énergie. Parmi les nouvelles techniques de stockage, cet article présent ...

2006

New Control Strategy for Three Level NPC Converter Connected to the Grid

Alfred Rufer, Aziza Benaboud

The aim of the present paper is to describe a new control strategy for a three level NPC converter connected to the grid, characterized by its high efficiency. This efficiency is achieved using a square wave modulation or SWM, which has the advantage of a ...

2006

A Hybrid Energy Storage System Based on Compressed Air and Super Capacitors With Maximum Efficiency Point Tracking (MEPT)

Alfred Rufer, Sylvain Lemofouet-Gatsi

In addition to the high-capacity storage facilities based on hydropower technologies, electrochemical solutions are today’s candidate for storage for renewable energy sources support. However, sustainability and limited life cycles of batteries are often i ...

2006

Étude des commutations pour interrupteurs quatre quadrants, exemple d'application utilisant les transistors MOS

Alfred Rufer, Philippe Barrade, Daniel Siemaszko

Cette recherche s’inscrit dans un travail de thèse sur l’utilisation de nouveaux types de composants de puissance et l’étude de nouveaux types de commutations. En premier lieu, ce travail présente la conception d’un interrupteur bidirectionnel en courant e ...

2006

An Energy-Flow Based Methodology - Application to hybrid vehicles

Alfred Rufer, Philippe Barrade

A new methodology is presented, based on energy-flow analysis on systems. The aim is to obtain a representation of energy flows between the various sources of a complex system, via energy storage devices connected together with electrical and mechanical co ...

2006

Multichannel DC-DC Converter’s Efficiency Optimisation by variable Number of active Channels

Alfred Rufer, Sylvain Lemofouet-Gatsi, Lukas Fleischli

In the context of energy storage with supercapacitors, the so called round trip efficiency is an important factor that can be strongly affected by the characteristics or performances of the used converter. This paper presents a dedicated DC-DC converter, w ...

2006

Les onduleurs multiniveaux : évolution de la recherche et applications futures

Alfred Rufer

Dans le domaine des onduleurs de nouvelles topologies sont apparues au cours des dernières années. Elles comprennent principalement la technique des onduleurs NPC à potentiels distribués, la technique dite des cellules imbriquées et superposées, ainsi que ...

2006

A fully analytical PEM fuel cell system model for control applications

Félix Grasser, Alfred Rufer

Maintaining a fuel cell system in correct operating conditions when subjected to fast load changes requires good system control. Best results are typically achieved using model based control strategies. This paper elaborates a control oriented PEM fuel cel ...

2006

Efficiency Considerations and Measurements of a Hybrid Energy Storage System based on Compressed Air and Super Capacitors

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents a study and experimentation of a hybrid energy storage system prototype, based on Compressed Air, where the charging and discharging is done within maximum efficiency conditions of the volumetric machine. As the maximum efficiency condi ...

2006

A DC Hybrid Circuit Breaker With Ultra-Fast Contact Opening and Integrated Gate-Commutated Thyristors (IGCTs)

Alfred Rufer

Air-magnetic circuit breakers are widely used for short-circuit protection in dc electric railways or industrial plants. The well-known drawbacks of these breakers are mainly a slow breaking action, a short lifetime, and high maintenance costs due to the d ...

2006

Hydro-pneumatic Energy Storage Systems for Renewable Sources Support: Principle, Efficiency Optimisation, Possible topologies

Alfred Rufer, Sylvain Lemofouet-Gatsi

1 Principle of Pneumatic Energy Storage 2 Optimisation of the Pneumatic-to-Mechanical Energy Conversion 4 Strategy for Power Flexibility: Hybrid Storage 5 Overall Efficiency and Possible Topologies 6 Economical Considerations ...

2006

Multisource DC-DC converter for the supply of hybrid multilevel converter

Alfred Rufer

The asymmetrical multilevel inverters allow to obtain a high resolution together with a good efficiency thanks to the switch hybridization. Nevertheless, the supplies of the cells must be insulated one from each other, which increases the converter complex ...

2006

Advanced Fuel Cell System Control through State Space Modelling

Félix Grasser, Alfred Rufer

Maintaining a fuel cell system in correct operating conditions when subjected to fast load changes requires good system control. In order to design such a controller, a simple PEFC system model describing all the important system dynamics and cross couplin ...

2005

Design and Control of a Supercapacitor Storage System for Traction Applications

Alfred Rufer, Philippe Barrade

The storage system in this paper is made of supercapacitors. The main goal is to ensure an efficient energy management in a series hybrid vehicle, even if braking resistors are still needed. Design considerations are discussed. In particular the influence ...

2005

Principle of Hybrid Energy Storage Systems based on Hydro-pneumatics and Supercapacitors for Distributed Generation and Renewable Energy Sources Support

Alfred Rufer, Sylvain Lemofouet-Gatsi

This paper presents hybrid energy storage systems based on hydro-pneumatics and Supercapacitors with high potentials regarding life cycle and impacts on environment. These so called “Batteries with Oil-hydraulics and Pneumatics (BOP)” systems exploit the h ...

2005

Page 10 sur 11