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Drazen Dujic

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Publications associées (209)

Comparative Study of Two-Quadrant DC/DC Stage in Power Supply for Superconducting Magnets

Serge Pittet, Émilien Luc Henri Coulinge, Drazen Dujic

To improve the performances of the present European Organization for Nuclear Research (CERN) Large Hadron Collider (LHC), a new family of power supplies for Superconducting Magnets (SCM) is being designed to enhance the operating cycle and recover magnetic ...

2018

IGCT Switching Behaviour Under Resonant Operating Conditions

Drazen Dujic, Dragan Stamenkovic

In the area of medium voltage DC-DC conversion, LLC Series Resonant Converter (LLC-SRC) presentsitself as an attractive topology for implementation of the DC transformer. Employing Integrated Gate Commutated Thyristor (IGCT) as a switching element one can ...

IEEE2018

Review of Protection Coordination Technologies in DC Distribution Systems

Drazen Dujic, Seongil Kim

With the evolution of power electronics technologies, DC networks have been considered as promising distribution systems for future grids. This new concept of power systems comes with technical challenges in protection coordination, a result of the no natu ...

2018

Protection Schemes in Low-Voltage DC Shipboard Power Systems

Drazen Dujic, Seongil Kim

2018

Leakage Flux Modeling of Multi-Winding Transformers for System-Level Simulations

Drazen Dujic, Min Luo, Jost Allmeling

In multiwinding transformers, different geometry of the individual windings leads to unbalanced leakage flux paths. The unbalance affects the behavior of the power electronic converters, where these transformers are used. This paper proposes an approach to ...

Ieee-Inst Electrical Electronics Engineers Inc2018

IGCT Switching Behaviour Under Low Current Conditions

Drazen Dujic, Dragan Stamenkovic

2018

Permeance Based Modeling of Magnetic Hysteresis with Inclusion of Eddy Current Effect

Drazen Dujic, Min Luo, Jost Allmeling

Magnetic hysteresis together with eddy current effects are typically present in metal based core materials and contribute significantly to the nonlinearity and power loss of the magnetic components operating in power electronic converters. In order to inve ...

IEEE2018

Cascaded H-Bridge Multilevel Converter for a High-Power Medium-Voltage Impedance-Admittance Measurement Unit

Marko Petkovic, Drazen Dujic, Francisco Daniel Freijedo Fernández, Nicolai Hildebrandt

Recent trends in power system design and inclusion of renewable energy sources and smart grids are creating different subsystem interactions that require proper investigation, understanding, describing and estimating global system stabilitythrough impedanc ...

2018

Power Supply System with Integrated Energy Storage for Superconducting Magnets

Émilien Luc Henri Coulinge, Drazen Dujic, Francisco Daniel Freijedo Fernández, Maria Papamichali

2018

MVDC Supply Technologies for Marine Electrical Distribution Systems

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

The increase in the popularity of the medium voltage dc (MVDC) electrical distribution, as a possible evolution of the medium voltage ac (MVAC) electrical distribution for the ship on-board power systems, arises a need for a comparative evaluation and demo ...

2018

Test Setup for Characterisation of Biased Magnetic Hysteresis Loops in Power Electronic Applications

Drazen Dujic, Min Luo, Jost Allmeling

Hysteresis effect of core materials contributes sig- nificantly to the power loss and nonlinearity of the transformers and filter inductors in power electronic applications. For design or modeling of the magnetic components, information of the magnetic mat ...

IEEE2018

An Approach for the Emulation of DC Grid Admittances: Implementation on a Buck Converter

Drazen Dujic, Francisco Daniel Freijedo Fernández, Enrique Rodriguez Diaz

2018

Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Drazen Dujic, Francisco Daniel Freijedo Fernández, Enrique Rodriguez Diaz

Dual active bridge (DAB) is a topology that is receiving more and more attention as a potential solution to interface dc grids of different voltage levels. From a system level, the implications of DABs on the stability of complex power systems are addresse ...

2018

Medium Voltage Impedance-Admittance Measurement System Based on the Cascaded H-Bridge Multilevel Converter

Marko Petkovic, Drazen Dujic, Francisco Daniel Freijedo Fernández, Nicolai Hildebrandt

Recent trends in power system design such as an increasing share of renewable energy sources and smart grids are creating different subsystem interactions that require proper investigation, understanding, describing and estimating global system stability t ...

2018

MMC-based High Power DC-DC Converter Employing Scott Transformer

Drazen Dujic, Stefan Milovanovic

2018

Achieving Protection Selectivitiy in DC Shipboard Power Systems Employing Additional Bus Capacitance

Drazen Dujic, Seongil Kim

With the implementation of energy efficiency regulations for all ships, DC shipboard power systems (SPS) have attracted much attention from the shipbuilding industry due to their advantages in fuel savings with variable speed engines and the closed bus-tie ...

2018

Sensitivity Analysis of Medium Frequency Transformer Design

Marko Mogorovic, Drazen Dujic

This paper discusses the technical challenges and trade-offs tied to design of medium frequency transformers (MFTs) for medium-voltage (MV) high-power (HP) power electronic applications, namely emerging solid state transformers (SSTs). A detailed analysis ...

IEEE2018

Evaluation of 1.7 kV SiC MOSFETs for a Regenerative Cascaded H-Bridge Multilevel Converter Cell

Marko Petkovic, Drazen Dujic, Nicolai Hildebrandt

High fidelity AC grid emulators allow early testing and qualification of various equipment under conditions close to those expected in reality. Realizing this at medium voltage high power level is associated with certain challenges, some of which are discu ...

2018

Six-Step MMC-Based High-Power DC-DC Converter

Drazen Dujic, Stefan Milovanovic

Roth DC collection and transmission grids have enjoyed a lot of popularity lately. In order to successfully take advantage of the benefits offered by DC systems, reliable connection between two networks of different voltage levels has to be obtained. This ...

2018

Dynamic Assessment of Source–Load Interactions in Marine MVDC Distribution

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

Medium-voltage direct-current (MVDC) distribution is a possible replacement due to the advancements in power electronic technologies, for existing medium-voltage ac distribution on ships. The new systems based on MVDC are expected to increase fuel efficien ...

Institute of Electrical and Electronics Engineers2017

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