Publications by Daniel Siemaszko

Power Compensation Approach and Double Frame Control for Grid Connected Converters

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

Operation of Modular Multilevel Converters Under Grid Asymmetries

Alfred Rufer, Daniel Siemaszko, Nicolas Cherix, Michail Vasiladiotis

The Modular Multilevel Converter is very likely to operate in a grid-connected mode under asymmetric conditions. Such a converter features several unique characteristics, which make its analysis different from other types of power converters in similar cas ...

2013

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

Nouveaux mécanismes de commutation pour des structures dédiées aux convertisseurs de puissance de haute efficacité et interrupteurs du futur

Daniel Siemaszko

Nowadays, the scarcity of cheap energy sources requires a particular effort in optimizing the performance of all conversions. The electric power vector is particulary expected to grow in importance, in conjunction with the development of renewable energy s ...

EPFL2009

Controlled Resonant Circuit with Commutated Capacitors using Self-Switching Power Devices

Alfred Rufer, Daniel Siemaszko, Christian Rod

This paper presents a preliminary work on a resonant circuit, also called AC-dipole. The resonance frequency of the circuit is changed by the mean of a variable capacitor connecting an inductor. For this purpose, a bank of switched capacitors of different ...

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

Investigations on a 1kVA Reactive Power Compensated Current Converter using monolithic RB-IGBT modules

Alfred Rufer, Daniel Siemaszko

This work presents a current converter topology with an added free-wheeling path on the output load. This converter allows the compensation of the reactive power consumption by forcing the input current fundamental component to be in phase with the input v ...

2009

Description and Efficiency Comparison of Two 25 kVA DC/AC Isolation Modules

Alfred Rufer, Frédéric Zurkinden, Daniel Siemaszko, Lukas Fleischli, Irma Villar

In the frame of the European project UNIFLEX-PM, two AC/AC converter topologies hove been studied and implemented. Both converters, rated for 25 kVA, are isolated by a medium-frequency power transformer. The first topology is based on a dual active bridge ...

2009

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

Rendements Energétiques de Convertisseurs DC-AC 25kVA Isolés à Deux ou Trois Etages

Alfred Rufer, Frédéric Zurkinden, Daniel Siemaszko, Lukas Fleischli

Dans le cadre du projet européen UNIFLEX-PM, deux topologies de convertisseur AC/AC ont été étudiées et implémentés. Les deux convertisseurs réalisés sont isolés par un étage transformateur moyenne fréquence pour une puissance nominale de 25kW. La première ...

2008

New self-switching mechanisms for active bidirectional switches

Alfred Rufer, Philippe Barrade, Daniel Siemaszko

The self-switching principle is a synthesis of synchronous type switching and switch inner protection mechanisms. Both switch ON and switch OFF are performed on the base of current and voltage measurement across the switch. Applied to an active bidirection ...

2007

The Active Self-controlled Free-wheeling Management Principle Applied to Reverse Recovery Losses Reduction

Alfred Rufer, Philippe Barrade, Daniel Siemaszko

Several works suggest the imminent appearance of bidirectional active devices. The promised performances go in the direction of a reverse recovery effects reduction and efficiency improvement. Our purpose is the study of an active management for switches t ...

2007

Étude des commutations pour interrupteurs quatre quadrants, exemple d'application utilisant les transistors MOS

Alfred Rufer, Philippe Barrade, Daniel Siemaszko

Cette recherche s’inscrit dans un travail de thèse sur l’utilisation de nouveaux types de composants de puissance et l’étude de nouveaux types de commutations. En premier lieu, ce travail présente la conception d’un interrupteur bidirectionnel en courant e ...

2006