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Drazen Dujic

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Related publications (209)

Deexcitation Characterization for Power Supply Protection in DC Shipboard Power Systems

The deexcitation of a synchronous machine has been used for the protection of the power supply based on a diode rectifier in marine dc power distribution networks. The fault current from the generator can be eliminated with the protection method utilizing ...

IEEE2020

Inductive Power Transfer System with Series Connected Primary and Independent Secondary Coils

Drazen Dujic, Xiaotong Du

2020

Identification of Source-Affected Output Characteristics of a Four-Quadrant Cascaded H-Bridge Converter Cell

Marko Petkovic, Drazen Dujic

The development and integration of power electronics equipment and converters for medium voltage ac and dc application has created different subsystem interactions that require proper investigation, understanding, description and estimation of global syste ...

IEEE2020

Design Optimization of Two-Quadrant High-Current Low-Voltage Power Supply

Serge Pittet, Émilien Luc Henri Coulinge, Drazen Dujic

The high-current delivered by a dedicated power supply is the condicio sine qua non to obtain the strong magnetic field produced by superconducting magnets. The end goal of such power supply is to control the current, very precisely, across this distinctiv ...

2020

Extending Protection Selectivity in DC Shipboard Power Systems by Means of Additional Bus Capacitance

Drazen Dujic, Seongil Kim

DC shipboard power systems have been connsidered as a promising solution for stricter environmental regulations on ships due to their main benefits in fuel savings with variable speed engines and easy integration of energy storage systems. In order to empl ...

2020

Highly Flexible Indirect Modular Multilevel Converter for High Power Pumped Hydro Storage Plants

Alexander Schwery, Drazen Dujic, Miodrag Basic

2020

Scalable Marine Bus-Tie Switch for Switchboard Interconnections

Drazen Dujic, Gabriele Ulissi

DC power distribution systems in marine applications are in the process of being established as the preferred solution for shipboard power distribution systems. This paper presents a bus-tie switch topology for the protection of such systems. The device is ...

2020

Multi-Variable High-Frequency Input-Admittance of Grid-Connected Converters: Modeling, Validation and Implications on Stability

Drazen Dujic, Francisco Daniel Freijedo Fernández, Marc Ferrer Duran

Modern grids are facing a massive integration of power electronics devices, usually associated to instability issues. In order to assess the likelihood and severity of harmonic instability in the high frequency region, this work develops a multi-variable i ...

2019

High-Power DC–DC Converter Utilising Scott transformer Connection

Drazen Dujic, Stefan Milovanovic

To obtain a resilient and flexible DC grid, reliable means for interfacing its parts operating under different voltage levels must be ensured. This paper proposes bidirectional, isolated, DC–DC converter designed to connect either high/medium voltage bipol ...

2019

Input-Admittance Passivity Compliance for Grid-Connected Converters With an LCL Filter

Drazen Dujic, Francisco Daniel Freijedo Fernández, Enrique Rodriguez Diaz

This work presents a design methodology and its experimental validation for the input-admittance passivity compliance of LCL grid-connected converters. The designs of the LCL filter parameters and discrete controller are addressed systematically, and suita ...

2019

Guest Editorial: Medium Voltage Power Electronics Technologies for Electrical Energy Generation, Conversion and Storage

Drazen Dujic

INST ENGINEERING TECHNOLOGY-IET2019

Soft Switching Behavior of IGCT for Resonant Conversion

Drazen Dujic, Dragan Stamenkovic

IEEE2019

Auxiliary Submodule Power Supply for a Medium Voltage Modular Multilevel Converter

Alexandre François Christe, Marko Petkovic, Drazen Dujic, Milan Utvic, Ignacio Alejandro Polanco Lobos

2019

Benchmark Study on Impedance Identification Methods for Grid Connected Converters

Marko Petkovic, Drazen Dujic

2019

Computationally Efficient Leakage Inductance Estimation of Multi-Winding Medium Frequency Transformer

Marko Mogorovic, Drazen Dujic

2019

Unidirectional High-Power DC-DC Converter Utilizing Scott Transformer Connection

Drazen Dujic, Stefan Milovanovic

2019

Open-Loop Power Sharing of Three-Port DC-DC Resonant Converters

Yan-Kim Tran, Drazen Dujic, Francisco Daniel Freijedo Fernández

Multi-port DC-DC converters are an attractive solution for highly flexible and efficient interface of different elements of DC grids (e.g., sources, loads, energy storage). This paper provides an analytic solution for the natural power sharing characterist ...

2019

Comprehensive Analysis and Design of a Quasi Two-Level Converter Leg

Drazen Dujic, Stefan Milovanovic

Quasi two-level operation of voltage source converters, intended to operate either within high/medium voltage DC networks or low output frequency applications, has caught the attention of both academia and industry. Sequential insertion of the so-called su ...

2019

Sensitivity Analysis of Medium Frequency Transformer Designs for Solid State Transformers

Marko Mogorovic, Drazen Dujic

This paper discusses the technical challenges and trade-offs tied to design of medium frequency transformers for medium-voltage high-power applications and emerging solid state transformers. A dedicated design optimization algorithm is used to generate the ...

2019

Supply Grid Synchronization and Operation of a Filterless Cascaded H-Bridge based Grid Emulator

Drazen Dujic, Nicolai Hildebrandt

Steadily increasing requirements for grid connected converters, their growing unit power and output voltage call for flexible high-power medium-voltage grid emulators. Four-quadrant Cascaded H-Bridge (CHB) topology features high output voltage resolution a ...

IEEE2019

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