Recherche

Afficher tous les résultats pour

Accueil

Personne

Alfred Rufer

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (215)

Multilevel Modular DC/DC Converter for Regenerative Braking Using Supercapacitors

Alfred Rufer, Daniel Montesinos Miracle

Regenerative braking is presented in many electric traction applications such as electric and hybrid vehicles, lifts and railway. The regenerated energy can be stored for future use, increasing the efficiency of the system. This paper outlines the benefits ...

2012

Optimal Energy Management of an Improved Elevator with Energy Storage Capacity based on Dynamic Programming

Alfred Rufer, Philippe Barrade

Efficiency and energy consumption reduction are becoming a key issue in elevation applications. Energy Storage Systems (ESS) can play a significant role on this field, together with their associated Energy Management System (EMS) in order to optimize the o ...

Ieee2012

Toward Ultrafast Charging of Electric Vehicles

Alfred Rufer, Massimiliano Capezzali, Stefano Grioni, Hans Björn Püttgen, Michail Vasiladiotis, Hardi Hõimoja

The paper is devoted to the problems arising from the ultrafast (≤ 10 min) charging of an electric vehicle (EV). An ultrafast charging station (UFCS) must provide high power output with minimal influence on the electricity transmission system, which can on ...

2012

Système de stockage d’énergie à bancs de condensateurs

Alfred Rufer

les accélérateurs de particules sont des installations conçues pour recevoir des particules à basse énergie et les accélérer avant extraction. ils fonctionnent généralement en mode pulsé, ce qui entraîne des variations de puissance très élevées et très rap ...

2012

Direct Connection of Supercapacitors to Photovoltaic Panels With On–Off Maximum Power Point Tracking

Alfred Rufer, Philippe Barrade, Simon Delalay

A system dedicated to energy storage is presented. It allows energy storage from photovoltaic panels to a compressed air accumulator. This accumulator is controlled to enable compression and expansion modes under Maximum Efficiency Point Tracking (MEPT). A ...

2012

Commande d’un moteur synchrone haute vitesse destiné à l’entraînement direct d’un turbocompresseur de pompe à chaleur

Alfred Rufer, Christian Rod

Dans le cadre du développement d’une nouvelle topologie de pompes à chaleur domestiques, un entraînement synchrone haute vitesse est étudié. Cet article présente l’étude de l’électronique de commande permettant le contrôle en vitesse du moteur considéré, e ...

2012

Power interfaces and storage selection for an ultrafast EV charging station

Alfred Rufer, Michail Vasiladiotis, Hardi Hõimoja

The paper is a summary of the research conducted so far on the ultrafast charging issues of electric vehicles with the main emphasis on the infrastructure. In order to estimate the load curve and peaks resulting from high charging rate, simulations are car ...

2012

Accurate Voltage Ripple Estimation and Decoupled Current Control for Modular Multilevel Converters

Alfred Rufer, Nicolas Cherix, Michail Vasiladiotis

The analytical solution for the sub-module voltage ripple equations of a Modular Multilevel Converter (MMC) is derived, based on the knowledge of the external voltage/current magnitudes and enhancing a concept previously presented in literature. In order t ...

2012

Infrastructure Issues Regarding the Ultrafast Charging of Electric Vehicles

Alfred Rufer, Hardi Hõimoja

This paper is devoted to the infrastructure issues arising from the ultrafast charging of electric vehicles in the timeframe of ~5 minutes. To mitigate variances and peaks caused by high energy transfer rate and pulse-like load, an ultrafast charging stati ...

2012

Dimensionnement formel des inductances de branches des Convertisseurs Modulaires Multiniveaux (MMC)

Alfred Rufer, Nicolas Cherix

Une des particularités essentielles des convertisseurs modulaires multiniveaux est la nature continue et sinusoïdale des courants qui les traversent. La présence d’inductances au centre de chacune de leurs phases autorise une certaine indépendance dans le ...

2012

An Ultrafast EV Charging Station Demonstrator

Alfred Rufer, Hardi Hõimoja

This paper deals with the design of a grid-friendly ultrafast electric vehicle charging demonstrator. High charging power and short charging times impose peaks to an electricity distribution system, which necessitate over-dimensioning of the grid connectio ...

2012

Functional Modeling and Energetic Macroscopic Representation of Modular Multilevel Converters

Alfred Rufer, Nicolas Cherix, Michail Vasiladiotis

A key feature of Modular Multilevel Converters (MMC) is the continuous and independent nature of the branch currents. Therefore, a decoupled control of the line and partial bus currents is possible, unlike for classical topologies. To this end, several con ...

2012

Transfert séquentiel d’énergie – adaptation de puissance par supercondensateurs

Alfred Rufer, Philippe Barrade, Simon Delalay

Cette contribution présente l’interface entre une source d’énergie faible puissance vers une application de puissance plus élevée, à fonctionnement intermittent. Dans le cas considéré, où la source de faible puissance est composée de cellules photovoltaïqu ...

2012

Study on the Reversible DC-DC Converter as Interface between Low and Medium Voltage DC Networks

Alfred Rufer, Stephan Kenzelmann, Carlo Arrioja

This paper introduces an isolated reversible DC-DC converter with a particular topology, which benefits from both the NPC (neutral point clamped) structure and the series-parallel connection of converters. The key property of the proposed topology is the o ...

2012

Poly-Phased Matrix Converter - A 27 input phases to 3 output phases experimental set-up running with hard and soft commutations

Alfred Rufer, Antoine Béguin

This paper presents an experimental set-up of a 27 phases input to 3 phases output Poly-Phased Matrix Converter (27x3 PPMC) realised for the real time experimentation of the dedicated control electronics. When the original converter system is dedicated to ...

Ieee2011

Weight and Efficiency Optimized DC/DC Converter based on Multiple Interleaved Channels

Alfred Rufer, Yannick Louvrier

Today, energy saving is one of the main objectives for engineers. In the case of mobile applications, energy can be saved by two different ways. First, decreasing the total masse of the system, and second, increasing the efficiency of the overall system. T ...

2011

Design Considerations for the Fast Charge of Supercapacitors in the Frame of Low Voltage Applications

Alfred Rufer, Philippe Barrade, Simon Delalay

Even if supercapacitors present a reduced energy density, they enable to store a significant amount of energy, which leads to a significant autonomy for applications with reduced energy needs. The main advantage of supercapacitors is there to compensate a ...

2011

Model Predictive-based Voltage Regulation of an Islanded Distributed Generation Unit

Alfred Rufer, Behrooz Bahrani

This paper presents a Discrete-time Model Predictive-based Control strategy for the voltage regulation of an islanded distributed generation (DG) unit. The DG unit includes a voltage source converter (VSC) interfaced to the grid through a switch and a coup ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Vector Control of Single-Phase Voltage-Source Converters Based on Fictive-Axis Emulation

Alfred Rufer, Stephan Kenzelmann, Behrooz Bahrani

This paper presents an alternative way for the current regulation of single-phase voltage-source dc-ac converters in direct-quadrature (dq) synchronous reference frames. In a dq reference frame, ac (time varying) quantities appear as dc (time invariant) on ...

Institute of Electrical and Electronics Engineers2011

A Comparison Between Two-Commutation-Cell Multichannel and Multilevel Buck-Derived Topologies

Alfred Rufer, Christian Rod

In the frame of the development of a very high speed synchronous drive, a DC/DC converter is studied. In this context, this paper presents the comparison between two two-commutation-cell topologies. A multichannel and a multilevel converter are formally co ...

Ieee2011

Page 5 sur 11