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Drazen Dujic

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Publications associées (209)

Fourier-Based Harmonic Control of Plug-and-Play Active Filters for Input-Series/Output-Parallel Solid-State Transformers

Drazen Dujic, Tianyu Wei, Andrea Cervone

2023

Scalability assessment of the parallel operation of direct current transformers

Drazen Dujic, Renan Pillon Barcelos

2023

Direct Arm Energy Control of the Modular Multilevel Matrix Converter

Philippe Alexandre Bontemps, Drazen Dujic, Milan Utvic

Modular multilevel matrix converter is a type of converter used in medium-voltage ac-ac power conversion. Controlling the energy content of the converter arms is a prerequisite for a proper converter operation, and at the same time a challenging control ta ...

2023

Crosstalk Voltage Suppression of SiC MOSFET With An Auxiliary Bidirectional Switch

Drazen Dujic, Chengmin Li

2023

Self-Synchronized Grid Impedance Estimation Unit using Interpolated DFT Technique

Drazen Dujic, Jules Christian Georges Macé, Andrea Cervone

Estimating the impedance of a grid-connected device or of a grid at the point of common coupling is important for evaluating the interaction between them. Impedance measurement involves a perturbation injection device, that perturbs the system, and a measu ...

2023

Gate unit for a gate-commutated thyristor and integrated gate-commutated thyristor

Drazen Dujic, Jakub Kucka

The invention relates to a gate unit (22) for controlling a gate commutated thyristor (21), comprising: - a voltage selector (26) for selectively applying a high supply potential (Vpos), a middle supply potential (Vmid), and a low supply potential (Vneg); ...

2023

Second Harmonic Ripple Voltage Suppression for Single-Phase ISOP Solid-State Transformer by Active Power Decoupling

Drazen Dujic, Tianyu Wei, Andrea Cervone

2023

Thermal Design of a Medium Voltage Modular Multilevel Converter Cell

Drazen Dujic, Yanick Patrick Frei

This paper presents the cooling concept for a medium voltage modular multilevel converter cell. To optimize power density, the metallic enclosure is used to dissipate the heat generated by semiconductor losses, while maintaining maximum temperatures below ...

New York2023

Square-Wave Source with Adjustable dv/dt for Insulation Testing under Mixed-Frequency Stresses

Drazen Dujic, Jennifer Abou-Najm, Chengmin Li, Hajime Takayama

2023

On Features of Direct Current Transformers

Drazen Dujic, Renan Pillon Barcelos

2023

Parallel Operation of Direct Current Transformers

Drazen Dujic, Renan Pillon Barcelos

VDE Verlag2023

Dc-Link Ripple Suppression of Cascaded H-Bridge Based MV Grid Emulator Apparatus for Analysis and Testing of Grid-Tied Converters in Distribution System

Drazen Dujic, Chengmin Li, Xin Xiang, Jing Sheng

The medium-voltage grid emulator is gaining popularity for testing grid-code compliance of large-capacity converters for renewable energy resources. The cascaded H-bridge converter based on active-front-ends is a promising candidate for high-power grid emu ...

2023

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

Method for operating a power converter and power converter

Drazen Dujic, Jakub Kucka

The present invention relates to a method for operating a resonant power converter (1) having a primary stage (2) and a secondary stage (3) at least one of which is actively operated and includes a half-bridge or full-bridge inverter (21) having a pull-up ...

2023

Resonant IGCT Soft-Switching: ZVS or ZCS

Drazen Dujic, Gabriele Ulissi, Jakub Kucka

2022

Performance Analysis of Energy Balancing Methods for Matrix Modular Multilevel Converters

Philippe Alexandre Bontemps, Drazen Dujic, Stefan Milovanovic

Modular multilevel converters achieve voltage scalability through the series connection of cells, each with its own capacitance. However, this converter structure using floating energy storage elements increases the control complexity significantly. The vo ...

2022

Power Reversal Algorithm for Resonant Direct Current Transformers for DC Networks

Drazen Dujic, Jakub Kucka, Renan Pillon Barcelos

2022

Reliable Gate Driving of SiC MOSFETs With Crosstalk Voltage Elimination and Two-Step Short-Circuit Protection

Drazen Dujic, Chengmin Li, Jing Sheng

2022

Modeling and Characterization of Natural-Convection Oil-Based Insulation for Medium Frequency Transformers

Drazen Dujic, Nikolina Djekanovic

Due to its high value of dielectric strength, oil is often used for transformer insulation. Nevertheless, its presence needs to be considered when determining thermal coordination of a converter system, which also includes the challenging modeling of fluid ...

2022

Shoot-Through Protection for an IGCT-Based ZVS Resonant DC Transformer

Drazen Dujic, Jakub Kucka

IGCTs have successfully demonstrated to be well-suited devices for an application in medium-voltage dc transformers based on LLC resonant converter topology. This application enables unusually high switching frequencies in kHz range thanks to the zero-volt ...

2022

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