Publications de Drazen Dujic | EPFL Graph Search

Exploring the Features of Power Electronic Converters for Hybrid AC-DC Microgrids

Drazen Dujic, Jules Christian Georges Macé

2025

Design Trade-offs of Second Harmonic Minimization in Solid-State Transformers

In two-stage solid-state transformers (SSTs) equipped with LLC DC/DC converters for galvanic isolation, fixed-frequency open-loop operation of LLC stages has been a straightforward and prevailing design choice. Meanwhile, with a closed-loop-operated LLC co ...

Institute of Electrical and Electronics Engineers (IEEE)2025

The FEPPCON XII Session on High-Power Converters

Drazen Dujic

Institute of Electrical and Electronics Engineers (IEEE)2025

Numerical study on pressure fluctuations in a variable speed pump-turbine with head variations

Drazen Dujic, Daniel Biner

Grid regulation capacities of Pumped Storage Hydropower Plants (PSHPs) are of great importance for today’s and future power supply systems. In this context, variable speed technologies provide solutions for enhanced operational flexibility of PSHP units. E ...

Institute of Physics2025

Evaluation of Magnetic Integration in Modularized-Bridge-Rectifier Solid-State Transformer

Drazen Dujic

Modularized Bridge Rectifier (mBR) is a promising solid-state transformer (SST) topology that replaces active front-end stages with diodes and utilizes multiple isolated DC/DC converters. This paper investigates magnetic integration schemes to mitigate the ...

2025

Considerations for design optimization of high-power medium-frequency transformers

Drazen Dujic

There are numerous ways to tackle the design optimization problem of inductive devices, being it a transformer or an inductor. The problem is generally nonlinear, nonconvex, and comprises a mix of continuous and discrete variables which makes it rather a d ...

Institution of Engineering and Technology2025

Second Harmonic Induced Resonant Modes of Fixed-Frequency Operated LLC Converters

Drazen Dujic, Andrea Cervone, Tianyu Wei

The fixed-frequency operated LLC converters can provide a fixed voltage gain with galvanic isolation between the input and output. However, when applied in two-stage AC/DC converters, the equivalent current that flows through the LLC converter, which corre ...

Institute of Electrical and Electronics Engineers (IEEE)2025

Active Filtering of Second-Order Harmonic in Two-Stage Single-Phase AC/DC Converters with Frequency Modulated Series-Resonant Converters

Drazen Dujic, Andrea Cervone

Series Resonant Converters allow an efficient, galvanically isolated, and load-independent DC/DC conversion, and can be used as isolation DC/DC units in two-stage single-phase AC/DC converters. However, in such systems, the single-phase Active Front End un ...

Institute of Electrical and Electronics Engineers (IEEE)2025

Power Losses Measurement Method for High Efficiency MV Oil-Insulated DC-DC Converter

Drazen Dujic

The concept of MVDC collection network for renewable applications requires a high efficiency DC-DC converter to connect low voltage sources to the medium voltage network. The accurate measurement of low power losses is not possible with traditional electri ...

Institute of Electrical and Electronics Engineers2025

Advanced Dual-Channel Gate Driver with Short-circuit Protection for Series Connected Medium-Voltage SiC MOSFETs

Drazen Dujic

The dual-channel gate driver (D-GD) is widely employed in the industry to support the extensive adoption of half-bridge power modules. With the growing popularity of silicon-carbide (SiC) devices in medium-voltage scenarios known for their superior switchi ...

Institute of Electrical and Electronics Engineers (IEEE)2025