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Drazen Dujic

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Publications associées (209)

Virtual Capacitor Concept for Partitioning of Large Converter Systems for RT-HIL Simulations

Philippe Alexandre Bontemps, Drazen Dujic, Stefan Milovanovic

In this paper, the real-time simulation model of the modular multilevel matrix converter was split into three independent instances using the concept of virtual capacitance. In doing so, the number of state space matrices that define the system has been re ...

2022

Discretization Uncertainties of Flow and Fatigue Damage Simulations of a Reversible Francis Pump-Turbine at Off-Design Operation in Turbine Mode

Philippe Alexandre Bontemps, Drazen Dujic, Daniel Biner

In the framework of the XFLEX HYDRO H2020 European Project, a 5 MW reversible Francis pump-turbine prototype, equipped with an industrial full size frequency converter, is investigated to demonstrate enhanced grid regulation capacities of variable speed hy ...

SPRINGER INTERNATIONAL PUBLISHING AG2022

Design Optimization of a MW-level Medium Frequency Transformer

Drazen Dujic, Nikolina Djekanovic

Nowadays, with the increased interest in applications dealing with high-power medium-voltage conversion, there is a strong need to master the design of medium-frequency transformers, which are one of the key components of modern DC transformers. The paper ...

2022

Copper Pipes as Medium Frequency Transformer Windings

Drazen Dujic, Nikolina Djekanovic

2022

A dc/dc converter and a method for operating a dc/dc converter

Drazen Dujic, Jakub Kucka

The present invention relates to a DC/DC converter (1) for transferring an active power between two DC subsystems (5, 6) comprising: - a first converter stage (3) and a second converter stage (4) both configured to be selectively operated as an active inve ...

2022

Flexible Operation of Variable Speed Direct-MMC in Hydropower Applications

Philippe Alexandre Bontemps, Drazen Dujic

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

Estimating Auxiliary Power Supply Consumption of the Modular Multilevel Converter Submodule for the Condition Health Monitoring

Drazen Dujic, Ignacio Alejandro Polanco Lobos

Condition health monitoring strategies applied to different power electronics applications are gaining popularity as early component degradation detection can trigger preventive maintenance actions before a significant fault occurs. In highly modular conve ...

2022

SOFTGATE – An IGCT Gate Unit for Soft Switching

Drazen Dujic, Jakub Kucka

This paper presents an IGCT unit that has been tailored for emerging soft-switching high-power applications. Redefining the state-of-the-art design and driving concepts, the size and consumption of the proposed unit can be reduced significantly. The paper ...

2022

Direct Current Transformer Impact on the DC Power Distribution Networks

Drazen Dujic, Renan Pillon Barcelos

The latest developments in dc transformer technology are enabling larger and more complex dc power distribution systems. However, the literature is scarce regarding the investigation and quantification of its impact on the dc grid. Therefore, this paper an ...

2022

Teaching Power Electronics: How to Achieve the Desired Learning Outcomes?

Philippe Alexandre Bontemps, Drazen Dujic, Chengmin Li, Yanick Patrick Frei, Andrea Cervone

2022

Improved Control of Symmetrical Half-Bridge based Second-Order Harmonic Active Filters

Drazen Dujic, Tianyu Wei, Andrea Cervone

2022

Winding Geometry Impact on High Power Medium Frequency Transformer Design

Drazen Dujic, Nikolina Djekanovic

2022

Inductive Power Transfer System for Auxiliary Power Supply in Medium Voltage Converters

Drazen Dujic, Xiaotong Du, Chengmin Li

Inductive power transfer technology is an attractive solution for medium voltage applications by eliminating the need for high voltage cables or wired connections in general. This paper introduces an inductive power transfer system which has multiple indep ...

2022

Condition Health Monitoring of Modular Multilevel Converter Submodule Capacitors

Drazen Dujic, Ignacio Alejandro Polanco Lobos

With a large deployment of power electronic converters in various critical applications, condition health monitoring is increasingly becoming important. In modular multilevel converter, submodule capacitance represents one of the critical components, havin ...

2022

Hybrid Modular Multilevel Converter Design and Control for Variable Speed Pumped Hydro Storage Plants

Drazen Dujic, Miodrag Basic, Milan Utvic

Hybrid modular multilevel converter control and design for pumped hydro storage plants is presented, addressing application-specific shortcoming of conventional back-to-back half-bridge modular multilevel converter: high common-mode-voltage machine stress. ...

2021

Virtual Capacitor Concept for Computationally Efficient and Flexible Real-Time MMC Model

Drazen Dujic, Min Luo, Stefan Milovanovic

This paper demonstrates the splitting of the modular multilevel converter real-time simulation model into several independent parts through the use of the virtual capacitor concept. As a result, the number of state-space matrices the real-time solver needs ...

2021

Impact of Synchronous Generator De-excitation Dynamics on the Protection in Marine DC Power Distribution Networks

Drazen Dujic, Seongil Kim

2021

Solid-State Technology for Shipboard DC Power Distribution Networks

Drazen Dujic, Gabriele Ulissi, Seongil Kim

The use of DC shipboard power distribution networks has been shown to offer several advantages over their AC counterparts. The reduction of the size and number of system components, the increased simplicity of operation and fuel efficiency of the system an ...

2021

Virtual Capacitor Concept for Effective Real-Time MMC Simulations

Drazen Dujic, Min Luo, Stefan Milovanovic

In this paper, the real-time simulation model of the modular multilevel converter was split into several independent parts through the use of the virtual capacitor concept. As a result, the number of state-space matrices the real-time solver needs to take ...

2021

Terminal Characteristics Measurements and Analysis of the Three-Phase Active Front End Converter Building Block

Marko Petkovic, Drazen Dujic

The safe and reliable operation of modern power system imposes the need to describe and estimate the system stability through impedance-admittance measurement and identification. The integration and operation of medium voltage equipment in existing infrast ...

Wiley2021

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