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Drazen Dujic

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Publications associées (208)

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Integrated Short-Circuit Protection Design Based on Dual-Channel Gate Driver for Series Connected Medium-Voltage SiC MOSFETs

Drazen Dujic, Rui Wang

Series connection of Silicon carbide (SiC) MOSFETs is needed for increasing the blocking voltage of available power devices (limited to 3.3 kV in the market) and has been extensively studied, particularly in the context of voltagebalancing design during no ...

IEEE2025

Modeling and Integrating Losses of Magnetic Components Into Time-Domain Electric Circuit Simulations

Drazen Dujic, Min Luo, Nikolina Djekanovic

To shorten converter design time and maximize the cost efficiency, advanced design tools are needed. These tools need to be capable of performing simulations in multiple relevant converter domains, such as electric, magnetic, dielectric, and thermal, simul ...

IEEE2020

Design and Characterization of PCB Spiral Coils for Inductive Power Transfer in Medium Voltage Applications

Drazen Dujic, Chengmin Li, Xiaotong Du

Coil design and operating frequency are key factors impacting the efficiency of inductive power transfer system. This paper presents the modeling of PCB spiral coils, design optimization and analysis on coil geometry and operating frequency for medium volt ...

2021

Flexible Operation of Variable Speed Direct-MMC in Hydropower Applications

Drazen Dujic, Philippe Alexandre Bontemps

This paper presents a flexible and grid code complying operation of the matrix modular multilevel converter used in a variable speed drive pumped hydro storage power plants. A hardware-in-the-loop platform, where the control algorithm is deployed on the AB ...

2022

Integrated Simulation Approach to Loss Calculations of Power Converter Systems

Drazen Dujic, Min Luo, Nikolina Djekanovic

There is a strong need in the power electronics community to have design tools capable of performing simultaneous simulations in different domains, e.g. electric, magnetic, dielectric and thermal. Therefore, this paper presents an approach to the calculati ...

2020

Hardware-in-the-Loop Modeling of an Actively Fed MVDC Railway Systems of the Future

Drazen Dujic, Stefan Milovanovic

This paper presents an averaged real-time model of an arbitrary size MVDC railway system. In contrast to references already available in the literature, focusing mainly on specific parts of such a railway network (e.g. power converter installed in a locomo ...

2021

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

Drazen Dujic, Min Luo

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

Turbine mode start-up simulation of a FSFC variable speed pump-turbine prototype - Part I: 1D simulation

Drazen Dujic, François Avellan, Sébastien Alligné, Antoine Béguin

Variable speed hydroelectric units equipped with full size frequency converter (FSFC) offer high operational flexibility enabling fast operating point transitions which increase grid regulation capacities. The XFLEX HYDRO H2020 European research project ai ...

IOP Publishing2021

FAULT RIDE THROUGH OF DC SOLID STATE TRANSFORMER IN MEDIUM VOLTAGE DC SYSTEMS

Drazen Dujic

Medium voltage direct current is emerging in distribution and collection networks and the network codes are under construction. This article introduces the MVDC network fault ride-through (FRT) requirement and the response of a DC solid state transformer i ...

2023

Medium Frequency Transformer Leakage Inductance Modeling and Experimental Verification

Drazen Dujic, Marko Mogorovic

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

DC Transformer Impact on Voltage Dynamics in Hybrid AC-DC Power Distribution Networks

Drazen Dujic, Andrea Cervone, Renan Pillon Barcelos, Jules Christian Georges Macé, Max Dupont

AC/DC power distribution networks use various types of power converters to interconnect their buses, active front ends between AC and DC buses, and DC transformers between DC buses. Different active front end control methods, like voltage or power regulati ...

VDE Verlag2023

A Versatile DC-DC Converter for Energy Collection and Distribution using the Modular Multilevel Converter

Drazen Dujic, Alfred Rufer, Michail Vasiladiotis, Stephan Kenzelmann

The drawbacks of conventional Modular Multilevel Converters (MMC) are described in terms of short-circuits. The configuration of MMC-transformer-MMC proves to handle short-circuits at the input and output without the need for additional DC or AC circuit br ...

Ieee2011

Performance Evaluation of Isolated DC/DC Converters in Modularized Bridge Rectifier Solid-State Transformer

Drazen Dujic, Andrea Cervone, Zhenchao Li

Modularized Bridge Rectifier (mBR) is a promising architecture of single-stage solid-state transformer. Without the presence of AC/DC active rectifier, the system performance solely depends on the control and optimization of isolated DC/DC converters. This ...

IEEE2025

High-Current Low-Voltage Power Supplies for Superconducting Magnets

Drazen Dujic, Émilien Luc Henri Coulinge

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

Active Power Decoupling for Single-Phase Input-Series-Output-Parallel Solid-State Transformers

Drazen Dujic, Andrea Cervone, Tianyu Wei

Solid-state transformers with input-series outputparallel structures are being considered for a variety of applications requiring MVAC to LVDC conversion. Due to the singlephase AC/DC conversion at the input side, all floating cells of the solid-state tran ...

2024

An Asymmetric Perturbation Signal for Enhanced Perturbation Injection Capabilities of a Grid-Connected Converter

Drazen Dujic, Andrea Cervone, Jules Christian Georges Macé

Impedance estimation is an important tool for grid- converter interaction evaluation. Using existing grid-connected converters for perturbation injection enables grid impedance estimation during operation without additional hardware (namely dedicated pertu ...

2024

100kW, 10kHz Medium Frequency Transformer Design Optimization and Experimental Verification

Drazen Dujic, Marko Mogorovic

This paper describes a novel, model based, design optimisation methodology for high-power medium frequency transformers for medium-voltage high-power electronic applications, namely emerging solid state transformers. Presented procedure enables the designe ...

2019

Drazen Dujic

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Integrated Short-Circuit Protection Design Based on Dual-Channel Gate Driver for Series Connected Medium-Voltage SiC MOSFETs

Modeling and Integrating Losses of Magnetic Components Into Time-Domain Electric Circuit Simulations

Design and Characterization of PCB Spiral Coils for Inductive Power Transfer in Medium Voltage Applications

Flexible Operation of Variable Speed Direct-MMC in Hydropower Applications

Integrated Simulation Approach to Loss Calculations of Power Converter Systems

Hardware-in-the-Loop Modeling of an Actively Fed MVDC Railway Systems of the Future

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

Turbine mode start-up simulation of a FSFC variable speed pump-turbine prototype - Part I: 1D simulation

FAULT RIDE THROUGH OF DC SOLID STATE TRANSFORMER IN MEDIUM VOLTAGE DC SYSTEMS

Medium Frequency Transformer Leakage Inductance Modeling and Experimental Verification

DC Transformer Impact on Voltage Dynamics in Hybrid AC-DC Power Distribution Networks

A Versatile DC-DC Converter for Energy Collection and Distribution using the Modular Multilevel Converter

Performance Evaluation of Isolated DC/DC Converters in Modularized Bridge Rectifier Solid-State Transformer

High-Current Low-Voltage Power Supplies for Superconducting Magnets

Active Power Decoupling for Single-Phase Input-Series-Output-Parallel Solid-State Transformers

An Asymmetric Perturbation Signal for Enhanced Perturbation Injection Capabilities of a Grid-Connected Converter

100kW, 10kHz Medium Frequency Transformer Design Optimization and Experimental Verification

Soft Switching Behavior of IGCT for Resonant Conversion

Auxiliary Submodule Power Supply for a Medium Voltage Modular Multilevel Converter

Benchmark Study on Impedance Identification Methods for Grid Connected Converters