Recherche

Afficher tous les résultats pour

Accueil

Personne

Alfred Rufer

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (215)

Model Predictive-based Control Method for Cascaded H-Bridge Multilevel Active Rectifiers

Alfred Rufer, Michail Vasiladiotis

The cascaded H-Bridge multilevel active rectifier is an emerging converter topology, which offers significant advantages, such as modularity and high flexibility for a wide range of applications, including traction systems, industrial automation plants, un ...

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

Railway Catenary Parameters Identification based on Harmonic Current Injection

Alfred Rufer, Martin Aeberhard, Behrooz Bahrani

Modern trains with active line-side converters are currently the state-of-the-art technology in the traction industry. In such systems, the active line-side converter of the drive system can be exploited for power quality improvement purposes. In this pape ...

Ieee2011

Proposal and Validation of Medium-Frequency Power Transformer Design Methodology

Alfred Rufer, Irma Villar

Power electronics is continuously evolving toward higher power densities. Consequently, volume, weight, and material reduction are becoming major design issues, which lead the research focus toward high/medium-frequency power conversion systems. This paper ...

2011

A Versatile DC-DC Converter for Energy Collection and Distribution using the Modular Multilevel Converter

Alfred Rufer, Stephan Kenzelmann, Michail Vasiladiotis, Drazen Dujic

The drawbacks of conventional Modular Multilevel Converters (MMC) are described in terms of short-circuits. The configuration of MMC-transformer-MMC proves to handle short-circuits at the input and output without the need for additional DC or AC circuit br ...

Ieee2011

Power and DC Link Voltage Control Considerations for Indirect AC/AC Modular Multilevel Converters

Alfred Rufer, Stephan Kenzelmann, Nicolas Cherix, Michail Vasiladiotis

A highly interesting application field of the Modular Multilevel Converter is the interconnection of the European three-phase 50 Hz industrial grid with the single-phase 16 2/3 Hz railway supply. Contrary to existing technologies, the utilization of a bulk ...

Ieee2011

Driving and Filling Personal Vehicles – The Questions of Energy - and Power - Density ( A Fast Filling Station for the Compressed Air Car )

Alfred Rufer, Sylvain Lemofouet-Gatsi, Arnaud Leuba, Mahbod Heidari

In the context of the development of zero emissions personal vehicles, compressed air cars have been proposed, as alternative solutions to electric solutions, with a small energy content leading to a limited range, but with interesting properties regarding ...

2011

Multivariable-PI-based DQ Current Control of Voltage Source Converters with Superior Axes Decoupling Capability

Alfred Rufer, Stephan Kenzelmann, Behrooz Bahrani

This paper presents a linear direct-quadrature (dq) current control strategy for voltage source converters (VSCs) in a rotating reference frame (RRF). The described method is based on Multivariable proportional-integral (PI) regulators and provides fast dy ...

Institute of Electrical and Electronics Engineers2011

A High Speed Synchronous Drive with Very Sensitive Back-emf Based Indirect Sensors

Alfred Rufer, Christian Rod

This paper presents preliminary results in the frame of the development of a very high speed synchronous drive with a rated power of 6 kW at the rated speed of 180 krpm taking place in the context of a university-industry partnership. Due to the very high ...

Ieee2011

Single Phase Resonant LC Circuit Using a Bank of Self-Switched Capacitors

Alfred Rufer, Daniel Siemaszko, Christian Rod

This paper presents a preliminary work on the feeding of an AC dipole using a resonant circuit with a varying resonant frequency. A single phase LC oscillator containing a variable capacitor is fed by a wide band amplifier or a voltage source inverter. For ...

Institute of Electrical and Electronics Engineers2011

Multilevel two quadrant DC/DC converter for regenerative braking in mobile applications

Alfred Rufer, Daniel Montesinos Miracle

In this paper different cascaded and multilevel topologies are compared for regenerative braking systems using supercapacitors (SC). It shows that the multilevel buck derived topology can beneficiate from both reduced voltage across the inductor and increa ...

2011

A versatile DC/DC converter based on Modular Multilevel Converter for energy collection and distribution

Alfred Rufer, Stephan Kenzelmann, Drazen Dujic

A topology based on the Modular Multilevel Converter (MMC) is presented, using two MMC linked by a medium frequency transformer. The back to back structure proves to have effective circuit breaker properties and reduced passive components. Due to the adopt ...

2011

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 Neutral Point Clamped (NPC) structure and the series-parallel connection of converters. The key property of the proposed topology is the o ...

2011

A vector controlled single-phase voltage source inverter with enhanced dynamic response

Alfred Rufer

Vector (dq) control is a powerful technique used in high dynamic performance inverters. The transformation of ac into dc quantities allows the controller to be designed as for dc-dc converters, with infinite gain at the steady-state operating point for zer ...

2010

Control of a multilevel modular DC/DC converter for mobile applications

Alfred Rufer, Daniel Montesinos Miracle

This paper presents the control design of a multilevel modular DC/DC converter for regenerative braking systems in mobile applications. The proposed control scheme is able to control the energy flow between supercapacitors and the DC link and equalizing th ...

2010

Re-generative Asymmetrical Multi-level Converter for Multi-Megawatt Variable Speed Drives

Alfred Rufer

This paper is focused on the design, modulation and control of a re-generative non-symmetrical multi-level converter for high-power applications such as oil and gas or mining. The converter is based on standard IGBT modules and the DC-link voltages are cho ...

2010

Modeling and Control of the Cross-Connected Intermediate-Level Voltage Source Inverter

Alfred Rufer

Multilevel inverter applications have become more and more common. Multilevel topologies have now to serve new purposes, and interest is rising in new application fields. Recent multilevel technologies have the potential to significantly reduce the size of ...

Institute of Electrical and Electronics Engineers2010

Efficiency 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 allow 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 to compensate a limited ...

2010

A High Current Pulse-Power Supply for Flash Lamps in PV-Panel Measurement-Facilities

Alfred Rufer, Dayana El Hage

In this paper, a high current pulse power supply for the feeding of a flash lamp has been developed, on the base of a multilevel converter with cascaded cells. The pulsed high power is provided by capacitive energy storage, directly connected to the cells ...

2010

Multilevel DC/DC converter design for mobile applications

Alfred Rufer, Daniel Montesinos Miracle

This paper compares different cascaded and multilevel topologies for bidirectional in current two quadrant DC/DC converters for regenerative braking systems using supercapacitors in mobile applications. The paper shows that the multilevel buck derived topo ...

2010

Active Self-Switching Methods for Emerging Monolithic Bidirectional Switches Applied to Diode-Less Converters

Alfred Rufer, Daniel Siemaszko

This paper presents a recently introduced switching principle for emerging monolithic bidirectional devices. Based on the hypothesis that those switches may overcome conventional diode type solutions in power converters, an active self-switching process be ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Page 6 sur 11