Alfred Rufer

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Related publications (215)

Design and Control of a KE (Kinetic Energy) - Compensated Gravitational Energy Storage System

A gravitational energy storage device is described where the kinetic energy to recover while braking a vertically moving mass is compensated by an auxiliary storage device based on supercapacitors. The characteristic power surge occurring by a fast decreas ...

IEEE2020

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 ...

2018

System Architectures for Multiports, Bidirectional and Buffered Charging Units for EV’s

Alfred Rufer

Bidirectional buffered units for Multiports charging of EV’s are presented, allowing to charge with high power even if the line current capability is limited. The systems are also dedicated to operate as reactive power compensators, or to provide grid syst ...

2018

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

Alfred Rufer, Gabriel Fernandez

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

Multiobjective Optimization of Medium-Frequency Transformers for Isolated Soft-Switching Converters Using a Genetic Algorithm

Alfred Rufer, Asier Garcia Bediaga, Irma Villar, Alejandro Rujas

The main challenge of medium-frequency transformers is the number of design parameters, constraints and objectives, and the difficulty of handling them on a particular design. This paper presents a novel computer-aided optimal design for MF transformers us ...

Ieee-Inst Electrical Electronics Engineers Inc2017

Analytical Models of Multiphase Isolated Medium-Frequency DC-DC Converters

Alfred Rufer, Asier Garcia Bediaga, Irma Villar, Alejandro Rujas

This paper presents new analytical equations, parametrized with respect to the number of converter phases, for multiphase isolated dc-dc topologies. This paper describes five multiphase isolated converter models, as well as their level of accuracy. Based o ...

Ieee-Inst Electrical Electronics Engineers Inc2017

Feed-Forward based Control in a DC-DC Converter of Asymmetric Multistage Stacked Boost Architecture

Alfred Rufer, Gina Kristin Steinke, Georgios Mademlis

A new feed-forward control technique for a DC-DC step-up converter based on the asymmetric Multistage Stacked Boost Architecture (MSBA) is proposed. The devel-oped feed-forward controller directly handles the load current and the perturbations that may be ...

Ieee-Inst Electrical Electronics Engineers Inc2017

The Dream of Efficient Energy Storage - From Bess, Kers & Co to the Hybrid Power Plant

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, called a ...

IEEE2017

Design, modeling and experimental validation of a novel finned reciprocating compressor for Isothermal Compressed Air Energy Storage applications

Alfred Rufer, Mahbod Heidari

Considering the need for a reliable and environmentally friendly energy storage solution for addressing renewable energy intermittency issue and following the developments on Isothermal Compressed Air Energy Storage (I-CAES) systems, a new finned piston co ...

Pergamon-Elsevier Science Ltd2017

Input-Series and Output-Series High Voltage Converter with Active Balancing Circuit for N-1 Operation

Alfred Rufer, Tiago Alexandre Nabais Lima

An input-series/output-series converter dedicated to high power applications is presented. The converter is composed of plural MF transformers based on DC-DC sub-converters. The series connection allows reaching input-voltage levels in the range of several ...

Ieee2016

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Design, modeling and experimental validation of a novel finned reciprocating compressor for Isothermal Compressed Air Energy Storage applications

Alfred Rufer, Mahbod Heidari

Pergamon-Elsevier Science Ltd2017

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

Alfred Rufer, Gabriel Fernandez

IEEE2018

Multiobjective Optimization of Medium-Frequency Transformers for Isolated Soft-Switching Converters Using a Genetic Algorithm

Alfred Rufer, Asier Garcia Bediaga, Irma Villar, Alejandro Rujas

Ieee-Inst Electrical Electronics Engineers Inc2017