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Alfred Rufer

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Publications associées (215)

Energetic Macroscopic Representation of a Hybrid Elevator – Considerations on Strategies for Energy Management

Alfred Rufer, Philippe Barrade

Accumulators are inserted on the DC bus of a conventional elevator, to increase its efficiency and limit the power demand on the main feeding grid. In the process that enable the identification of the control of such a system, The Energetic Macroscopic Rep ...

2013

Multivariable Control of Single-Inductor Dual-Output Buck Converters

Alfred Rufer, Alireza Karimi, Behrooz Bahrani

Cross regulation is the main technical drawback of a Single-Inductor Multiple-Output (SIMO) dc-dc converter. This paper proposes a multivariable digital controller to suppress the cross regulation of a Single-Inductor Dual-Output (SIDO) buck converter in C ...

Ieee2013

Balancing Control Actions for Cascaded H-Bridge Converters with Integrated Battery Energy Storage

Alfred Rufer, Michail Vasiladiotis

This paper investigates the ways to handle active power components for control and balancing purposes in three-phase Cascaded H-Bridge converters with embedded battery energy storage systems. The split storage elements are interfaced to the converter modul ...

2013

Renewable energy systems for racing sailboats - From simulations to an experimental device

Alfred Rufer, Philippe Barrade

Providing racing sailboats with renewable energy sources deals with boat performances, reliability and skipper’s security. In this study, an innovative solution is presented to feed a sailboat with green energy by using a hydro-generator. This paper also i ...

2013

Catenary Voltage Support: Adopting Modern Locomotives With Active Line-Side Converters

Alfred Rufer, Martin Aeberhard, Behrooz Bahrani

This paper proposes a voltage support scheme for traction networks, which compensates for the voltage drop along the catenary line to which locomotives are connected. The proposed method is based on the injection of capacitive reactive power through the cu ...

2013

Design and Control of a Modular Multilevel DC/DC Converter for Regenerative Applications

Alfred Rufer, Daniel Montesinos Miracle

This paper compares different cascaded and multilevel topologies to interface supercapacitors to a dc bus in regenerative braking applications. It is shown that the modular multilevel dc/dc converter (MMC) can benefit from both reduced voltage and increase ...

2013

Sizing of branch inductors parameters in modular multilevel converters: An analytical approach

Alfred Rufer, Nicolas Cherix, Michail Vasiladiotis

One of the key features of Modular Multilevel Converters is the existence of inductors inside the branches that constitute each of their phases. These inductors, which may be coupled or non-coupled, authorize a certain independency in the control of the br ...

2013

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

A Multivariable Design Methodology for Voltage Control of a Single-DG-Unit Microgrid

Alfred Rufer, Alireza Karimi, Behrooz Bahrani

This paper proposes a multivariable digital control design methodology for the voltage regulation of an islanded single distributed generation (DG) unit microgrid and its dedicated load. The controller design methodology is based on a family of spectral Mu ...

2013

Decoupled dq-Current Control of Grid-Tied Voltage Source Converters Using Nonparametric Models

Alfred Rufer, Alireza Karimi, Behrooz Bahrani

This paper presents a vector control strategy for regulating the current of grid-tied voltage source converters (VSCs) in a rotating reference frame. The proposed approach is based on shaping the open-loop and closed-loop transfer matrices of the system. S ...

Institute of Electrical and Electronics Engineers2013

Fictive Axis Emulator-based State Feedback Vector Current Control for Single-Phase Voltage Source Converters

Alfred Rufer, Michail Vasiladiotis

This paper presents a vector current control method tailored for single-phase voltage source converters. In order to imitate the behavior of a three-phase system, the Fictive Axis Emulation (FAE) concept is employed. The latter is able to synthesize the ro ...

2013

New Parametric Model of Medium-Frequency Single-Active-Bridge Converters

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

This paper presents a new parametric model of a single-active-bridge (SAB) converter with a variable number of phases. The soft-switching behavior and the design of snubbers are also analyzed. The analytical study is validated using PLECS simulation softwa ...

2013

Electric Vehicle Driving and Fast Charging System based on Configurable Modular Multilevel Converter (CMMC)

Alfred Rufer, Rosa Martel Danoary Tsirinomeny

Electric Vehicles (EVs) owners are challenged by the limited flexibility of the actual EVs on-board charger according to the available charging station. This paper proposes a new concept of a Unified Converter (UC) for EVs based on the Configurable Modular ...

2013

Power Compensation Approach and Double Frame Control for Grid Connected Converters

Alfred Rufer, Daniel Siemaszko

The handling of weak networks with asymmetric disturbances implies the accurate handling of the second harmonic component appearing under unbalanced networks. This paper proposes a two-step approach using classic vector control for operating the current co ...

Ieee2013

Optimization-Based Voltage Support in Traction Networks Using Active Line-Side Converters

Alfred Rufer, Behrooz Bahrani

Low system voltage in traction networks, mainly caused by active power absorption of locomotives, adversely affects the performance of the locomotives and also the power transmission capability of the catenary line. This paper introduces a voltage support ...

2013

Analysis and Development of a New Compressor Device Based on The New Finned Piston

Alfred Rufer, Mahbod Heidari

In the general frame of Compressed Air Energy Storage system (CAES), the LEI Laboratory of EPFL has introduced the concept of dry finned piston. The main goal is to achieve energy storage by means of compressed air thanks to high isothermal efficiency comp ...

2013

Modular DC/DC Converter: Comparison of Modulation Methods

Alfred Rufer, Stephan Kenzelmann, Drazen Dujic

This paper presents a bidirectional modular DC/DC converter. It consists of two Modular Multilevel Converters (MMC) linked by a transformer to achieve galvanic isolation. This topology serves as “DC transformer” interfacing low and medium voltage DC grids. ...

2012

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: decreasing the total masse of the system and increasing the efficiency of the overall system. This paper presen ...

2012

Modular Converter Architecture for Medium Voltage Ultra Fast EV Charging Stations: Global System Considerations

Alfred Rufer, Antoine Béguin, Michail Vasiladiotis

Electric Vehicles (EVs) are expected to contribute significantly to the reduction of CO2 emissions and other types of pollution within the next years. However, the concept of their ultra fast charging still poses demanding requirements, both in terms of th ...

2012

Modeling of a Reciprocating Air Compressor using Energetic Macroscopic Representation

Alfred Rufer, Mahbod Heidari

This article introduces the energetic macroscopic representation (EMR) as approach for the dynamic nonlinear modeling of a reciprocating air compressor. EMR has been introduced recently for research development in complex electromechanical systems. It is b ...

2012

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