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Alfred Rufer

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Publications associées (215)

DC-DC Converter based on the Asymmetric Multistage Stacked Boost Architecture with Feed-Forward Control for Photovoltaic Plants

Alfred Rufer, Gina Kristin Steinke, Georgios Mademlis

A new feed-forward control technique for a DC-DC step-up converter based on the asymmet-ric Multistage Stacked Boost Architecture (MSBA) is presented in this paper. The proposed closed loop control scheme can provide improved accuracy in the steady-state o ...

2016

Control Method and Prototyping of the Multistage Stacked Boost Architecture (MSBA)

Alfred Rufer, Gina Kristin Steinke

This paper includes a look into the resonant phenomena of the Multistage Stacked Boost Architecture and a dedicated control method for the MSBA converter to handle these resonances. A linearized fast feed-forward control relying on the feedback of the outp ...

Ieee2016

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

Control of the Actively Balanced Capacitive Voltage Divider for a Five-Level NPC Inverter - Estimation of the Intermediary Levels Currents

Alfred Rufer, Nicolas Cherix, Nelson William Koch

This article addresses the control of a Multistage Stacked Boost Architecture (MSBA) feeding a five-level NPC inverter in a grid-tied application. A suitable control strategy was previously presented, in which estimated/reconstructed intermediary currents ...

2016

Dead time and non-linearities compensation for CHB multi-level converters with integrated ESS feeding EV’s ultra-fast charging stations

Alfred Rufer

This paper deals with a compensation technique for non-linear behaviour of single phase modular multi-level power converter, feeding electric vehicle fast charging station with split integrated energy storage system. The proposed method calculates the volt ...

2016

Gas Turbine: Optimization of Energy Production and High Efficiency by Using Power Electronics

Alfred Rufer, Aziza Benaboud

The use of gas turbines in the power generation industry has been increasing. Their demand represents more than 50% of the world market of thermal power plants. Electric power generators using gas turbines as power sources are connected to the turbines thr ...

Elsevier Science Bv2016

Energetic Macroscopic Representation of A Linear Reciprocating Compressor Model

Alfred Rufer, Philippe Barrade, François Gallaire, 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 and is b ...

Elsevier2015

A flexible and robust power management mechanism based on single-phase Modular Multilevel Converter with integrated energy storage elements

Alfred Rufer, Rosa Martel Danoary Tsirinomeny

This paper deals with a power management mechanism using Modular Multilevel Converter (MMC) with integrated energy storage elements, the typical use of which could be a grid-interface for a photovoltaic park or a charging park for electric vehicles. In com ...

2015

A Five-Level NPC Photovoltaic Inverter with an Actively Balanced Capacitive Voltage Divider

Alfred Rufer

A new five-level photovoltaic Inverter is presented, implemented by associating a Multistage Stacked Boost Architecture (MSBA) with a 5-level NPC inverter. Ahead of the MSBA conversion stage, a conventional boost converter allows the operation of the PV ce ...

2015

Challenges and Solutions Towards the Ultra Fast Charging of EV's

Alfred Rufer

2015

A Rapid DC Component Elimination Strategy for Alternative Current in Frequency Converter

Alfred Rufer, Aziza Benaboud

The principle achievement of this contribution is to develop and to describe a rapid DC component elimination strategy for AC currents in the frequency converter, simply by selecting transient period. To avoid DC component on the line current, it’s known t ...

2015

Operation and Control of Single-to-Three-Phase Direct AC/AC Modular Multilevel Converters under Asymmetric Grid Conditions

Alfred Rufer, Nicolas Cherix, Michail Vasiladiotis

Single-to-three-phase direct AC/AC Modular Multilevel Converters have gained a significant interest in the field of railway interties. The use of such an MMC-based structure implies more advanced control techniques as well as design requirements, especiall ...

2015

Use of a DC-DC step up converter in photovoltaic plants for increased electrical energy production and better utilization of covered surface area

Alfred Rufer, Gina Kristin Steinke

An important parameter for the economy of a photovoltaic plant is the coefficient of generated power to needed surface. An analysis of this relationship is done for different solar plants and losses generated by the transmission within such a plant are cal ...

2015

Single-to-Three-Phase Direct AC/AC Modular Multilevel Converters with Integrated Split Battery Energy Storage for Railway Interties

Alfred Rufer, Nicolas Cherix, Michail Vasiladiotis

This paper presents a global hierarchized control method for railway interties based on the direct singleto-three-phase AC/AC Modular Multilevel Converter with integrated split battery energy storage. The power and voltage decoupling between the converter ...

2015

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

Configurable Electric Vehicle (CEV) demonstrator

Alfred Rufer, Rosa Martel Danoary Tsirinomeny

In order to make electric vehicles more and more attractive, it is essential to improve the range flow rate1 under limited charging infrastructures. Therefore, a universal input and high power electric energy conversion will impose new requirements on powe ...

2015

Impact of Grid Asymmetries on the Operation and Capacitive Energy Storage Design of Modular Multilevel Converters

Alfred Rufer, Nicolas Cherix, Michail Vasiladiotis

The grid-connected modular multilevel converter (MMC) is very likely to operate under asymmetric grid conditions. Such a converter features several unique characteristics, whichmake its analysis different from other types of power converters in similar cas ...

Institute of Electrical and Electronics Engineers2015

Control of a Modular DC-DC Converter Dedicated to Energy Storage

Alfred Rufer, Philippe Barrade, Émilien Luc Henri Coulinge

A DC-DC converter system is presented based on an Input-Series/Output-Parallel Dual Active Bridge structure, in a full modular design. The association of 4 elementary modules leads to a one stage DAB. The proposed converter is dedicated to interface a DC-v ...

2015

High-Power High-Voltage Isolated DC-DC Converters using an NPC Balanced Capacitive Divider

Alfred Rufer

A new isolated DC-DC converter is presented suited for high voltage applications. It is based on the series connection of NPC inverter cells, using semiconductor devices with lower voltage blocking capability than the total input voltage. The galvanic isol ...

2015

Analysis and Control of Modular Multilevel Converters with Integrated Battery Energy Storage

Alfred Rufer, Michail Vasiladiotis

Multilevel Converters and battery energy storage systems (BESS) are key components in present and future medium voltage networks, where an important integration of renewable energy sources takes place. The Modular Multilevel Converter (MMC) offers the capa ...

Ieee-Inst Electrical Electronics Engineers Inc2015

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