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Alfred Rufer

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Related publications (215)

Page 5 of 11

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

A Cascade Voltage Controller for Three-phase Islanded Microgrids

Alfred Rufer, Behrooz Bahrani

This paper proposes a cascade or multiloop digital control strategy for the voltage regulation of a three-phase islanded single distributed generation (DG) unit microgrid and its dedicated load. The cascade control strategy consists of an inner dq-currents ...

2013

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

A novel 60 MW Pulsed Power System based on Capacitive Energy Storage for Particle Accelerators

Alfred Rufer

Large physics experimentation as in particle accelerators or in nuclear fusion is often characterised by a strong and modulated power demand, incompatible with the power availability of the grid. Therefore, large facilities for short-term energy storage ha ...

2008

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

Alfred Rufer, 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

Cross-Connected Intermediate Level (CCIL) Voltage Source Inverter

Alfred Rufer

Recently, multilevel applications have know n many improvements. Initially introduced to answer the problem of the series-connection of components in medium voltage applications, multilevel topologies have now to serve new purposes. Recent multilevel techn ...

2007

Influence of High Frequency Charge-Discharge Cycling Induced by a Configurable Modular Multilevel Converter

Alfred Rufer, Rosa Martel Danoary Tsirinomeny

In the framework of the diversification of the electric vehicle charging standards, the configurable modular multilevel converters (CMMC) have been found as one of the best concepts for a universal and flexible charging system. It is foreseen that they inc ...

2015

A Bidirectional Buffered Charging Unit for EV's (BBCU)

Alfred Rufer

A bidirectional buffered charging unit for EV's is presented, allowing the charge with high power even if the line current capability is limited. The bidirectional buffer is connected to the AC line and is mainly dedicated to vehicles with on-board AC-DC c ...

IEEE2018

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

Optimizing EV driving-recharge time ratio a under limited grid connection

Alfred Rufer, Hardi Hõimoja

An evident issue for electric vehicle (EV) is the limited average speed while driving long distances. This paper will provide a better understanding of EV requirements in order to make the electric vehicles more compatible for long distance driving. Batter ...

2014

Importance of Quasi-Saturation Effect in the Bipolar Junction of High Voltage NPT- IGBTs for power calculations

Alfred Rufer, Serge Pittet

During the turn-on process insulated gate bipolar transistors (IGBTs) traverse a quasi-saturation region from the off-state to the on-state (saturation). The additional voltage drop due to the quasi-saturation of the junction hardly depends on the DC-link ...

2001

On The Efficiency Of Energy Storage Systems - The Influence Of The Exchanged Power And The Penalty Of The Auxiliaries

Alfred Rufer

Storage is an important domain of the energy sector, with its traditional, classical solutions for smaller and larger amounts of energy. Energy storage has become of higher importance in relation with the development of alternative energy sources, leading ...

UNIV NIS2021

An Analytical, Control-Oriented State Space Model for a PEM Fuel Cell System

Alfred Rufer, Félix Grasser

Correctly controlling a fuel cell system and maintaining correct operating conditions, particularly under dynamic load variations, is difficult without advanced, multivariable control systems. In order to design and implement such controllers, an appropria ...

2007

Control of a Hybrid Asymmetric Multilevel Inverter for Competitive Medium-Voltage Industrial Drives

Alfred Rufer, Martin Veenstra

In symmetric multilevel inverters, there is a tradeoff between the output quality and the reliability and efficiency of the converter. New asymmetric and hybrid solutions, using different voltages and devices in various parts of the inverter, promise signi ...

2005

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

Energetic Macroscopic Representation (EMR) and control scheme for the asymmetric 4-stage MSBA

Alfred Rufer, Gina Kristin Steinke

The Multistage Stacked Boost Architecture (MSBA) is a non-isolated step-up converter topology intended for renewable energy generation systems or distribution networks. In previous papers the functionality and intended applications for this topology have b ...

2016

Fluid Flow Analysis of a New Finned Piston Reciprocating Compressor Using Pneumatic Analogy

Alfred Rufer, Mahbod Heidari

The goal of this paper is to investigate the fluid flow analysis in a novel multilayered finned reciprocating compressor, adopting a so-called “pneumatic-Electric” analogy using a lumped methodology. This machine includes two sets of concentric annular fin ...

2014

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

Alfred Rufer, Sylvain Lemofouet-Gatsi

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

An overview of the technique of asymmetrical multilevel inverters

Alfred Rufer

This paper deals with cascade multilevel inverters. It focuses on asymmetrical topologies where the cell input voltages are of different values. These hybrid topologies might be interesting for several applications. One of the main benefit is the high reso ...

2005

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