Recherche

Afficher tous les résultats pour

Accueil

Personne

Drazen Dujic

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (209)

Virtual Submodule Concept for Fast Semi-Numerical Modular Multilevel Converter Loss Estimation

Alexandre François Christe, Drazen Dujic

During the design phase of a modular multilevel converter (MMC), an accurate loss evaluation of the submodule (SM) plays an important role. In this paper, a method based on the analytical description of the MMC key waveforms that allows to directly obtain ...

Institute of Electrical and Electronics Engineers2017

Medium Frequency Transformer Design and Optimization

Marko Mogorovic, Drazen Dujic

This paper describes the technical challenges tied to modeling and design optimization of the medium frequency transformer (MFT) for power electronic applications, namely emerging solid state transformers (SSTs). A detailed analysis and modelling of the ph ...

2017

High-Current Low-Voltage Power Supplies for Superconducting Magnets

Émilien Luc Henri Coulinge, Drazen Dujic

In a synchrotron accelerator, the beam trajectory is controlled thanks to magnets, where superconducting technology allows to generate very strong magnetic fields. This was a key element in the construction of the Large Hadron Collider (LHC), the world lar ...

2017

Medium Frequency Transformer Leakage Inductance Modeling and Experimental Verification

Marko Mogorovic, Drazen Dujic

This paper provides detailed analytical modelling and finite elements method (FEM) analysis of the medium frequency transformer (MFT) leakage inductance, as one of the key design factors governing the operation of galvanically isolated power electronics co ...

2017

Novel Insight into the Output Current Ripple for Multilevel and Multiphase Converter Topologies

Alexandre François Christe, Drazen Dujic

When it comes to the computation / estimation of the switching losses in a multilevel converter, it is crucial to know the instantaneous value of the output current. If the average output current value is used instead, there is a non negligible error when ...

2017

Marine MVDC Multi-Phase Multi-Pulse Supply

Uzair Javaid, Drazen Dujic, Francisco Daniel Freijedo Fernández, Wim Van der Merwe

This paper presents comparative evaluation and explores the different technologies suitable for the implementation of the Medium Voltage Direct Current (MVDC) electrical supplies for the marine on-board electrical distribution network. To realize the MVDC ...

2017

Modelling Hysteresis of Soft Core Materials using Permeance-Capacitance Analogy for Transient Circuit Simulations

Drazen Dujic, Min Luo, Jost Allmeling

Magnetic components using soft core materials are widely used in power electronic converters. The hysteresis effect of the material leads to power loss and harmonic distortion. If this effect can be modelled in system-level time-domain simulation, the perf ...

Ieee2017

Virtual Submodule Concept Applied to the Modular Multilevel Converter

Alexandre François Christe, Drazen Dujic

The design phase of a modular multilevel converter (MMC) needs to be supported by suitable tools for the submodule loss evaluation. This paper proposes a fast MMC cell loss calculation based on the virtual submodule (VSM) concept. Compared to other propose ...

VDE VERLAG GMBH, 20172017

Interactions Between Bandwidth Limited CPLs and MMC Based MVDC Supply

Alexandre François Christe, Uzair Javaid, Drazen Dujic, Francisco Daniel Freijedo Fernández

With the improvement in the power electronic technologies, medium voltage dc (MVDC) electrical distribution systems are being considered for on-shore and off-shore applications. These future MVDC electrical distribution systems are expected to provide the ...

2017

Thermal Modeling and Experimental Verification of an Air Cooled Medium Frequency Transformer

Marko Mogorovic, Drazen Dujic

This paper provides detailed analytical modeling and finite elements method (FEM) analysis of the thermal behavior of the medium frequency transformer (MFT). A comprehensive analytical model in form of a thermal network consisting of conduction, convection ...

Ieee2017

Conformal Mapping of Impedance Stability Models for System-Level Dynamics Assessments

Uzair Javaid, Drazen Dujic, Francisco Daniel Freijedo Fernández

Impedance stability methods are suitable for assessing the dynamics of power converters controllers, but also for ac/dc microgrids system level studies. This work proposes the combination of impedance modeling and conformal mapping for the identification o ...

2017

Design for Passivity in the Z-Domain for LCL Grid-Connected Converters

Drazen Dujic, Francisco Daniel Freijedo Fernández

This paper develops a design methodology aimed to shape passive the admittance of the LCL grid-connected voltage source converters (VSCs). A novel aspect of this work is the assessment of the range of frequencies for control design: due to discrete and PWM ...

2016

A Multiport Medium Voltage Isolated DC-DC Converter

Yan-Kim Tran, Drazen Dujic

A multiport medium voltage (MV) isolated DC-DC converter with integrated energy storage, suited for connection of low voltage (LV) and medium voltage (MV) DC grids is presented. A multi-stage structure, adapted for MV ratings, is composed of multiple ident ...

2016

Insulation Coordination for a Modular Multilevel Converter Prototype

Alexandre François Christe, Émilien Luc Henri Coulinge, Drazen Dujic

This paper provides a detailed overview of the dielectric design and insulation coordination applied to a medium voltage modular multilevel converter prototype. The complete system has ratings of 0.5 MVA and is designed for connection to a 10 kVdc supply w ...

Ieee2016

Galvanically Isolated Modular Converter

Alexandre François Christe, Drazen Dujic

Direct current (DC) electrical grids are already a reality in low voltage (LV) telecom distribution systems and point-to-point high voltage DC transmission. Medium voltage (MV) domain, despite its big potential, still suffers from a lack of suitable conver ...

Inst Engineering Technology-Iet2016

A Multiport Isolated DC-DC Converter

Yan-Kim Tran, Drazen Dujic

This paper presents a multi-port isolated DC-DC converter for DC applications. A three-port structure is presented, characterized with full bidirectional power flow and simple control. Galvanic isolation is achieved by means of a multi-winding medium frequ ...

IEEE2016

Electro-Thermal Design of a Modular Multilevel Converter Prototype

Alexandre François Christe, Émilien Luc Henri Coulinge, Drazen Dujic

This paper describes the electro-thermal design of a medium voltage modular multilevel converter prototype, from the submodule power semiconductor thermal requirements to the overall system level integration. The high number of semiconductors and capacitor ...

VDE VERLAG GMBH2016

Leakage Flux Modelling of Multi-Winding Transformer using Permeance Magnetic Circuit

Drazen Dujic, Min Luo, Jost Allmeling

The size and position difference of the windings determine the leakage flux path and give rise to unbalance of the short-circuit impedances, which strongly affects the transient behaviour of the transformer. This work proposes a new approach of modelling w ...

Ieee2016

On the integration of low frequency transformer into modular multilevel converter

Alexandre François Christe, Drazen Dujic

Various high power applications require power converters with large voltage step ratios, easily achieved by inclusion of a single or multiple transformers, which provide galvanic isolation at the same time. This paper presents, in a systematic manner, the ...

IEEE2015

Multiport Resonant DC-DC Converter

Philippe Barrade, Yan-Kim Tran, Drazen Dujic

his paper presents a multiport galvanically isolated LLC resonant DC-DC converter suitable for DC applications. A three-port structure is analyzed, with full bidirectional power flow capabilities, simple control and behavior similar to that expected from a ...

2015

Page 10 sur 11