Publications by Drazen Dujic | EPFL Graph Search

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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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

Recent trends in power system design such as an increasing share of renewable energy sources and integration of power electronics equipment for medium voltage applications are creating different subsystem interactions that require proper investigation, und ...

Direct current (DC) electrical grids are already a reality in low voltage (LV) telecom distribution systems and point-to-point high voltage DC transmission. Medium voltage (MV) domain, despite its big potential, still suffers from a lack of suitable conver ...

This paper proposes a novel class of neural-network inspired statistical data-driven models, especially derived for the purpose of design optimization of medium frequency transformers. These models allow for an efficient (3-5 orders of magnitude faster com ...

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 ...

In the future, new aspects from decentralized generation using different dc voltage levels are expected to influence the general concept of power exchange. Converter are needed to adapt the voltage between low voltage (LV), medium voltage (MV), and high vo ...

In the area of medium voltage DC-DC conversion, LLC Series Resonant Converter (LLC-SRC) presentsitself as an attractive topology for implementation of the DC transformer. Employing Integrated Gate Commutated Thyristor (IGCT) as a switching element one can ...

This paper describes the electro-thermal design of a medium voltage modular multilevel converter prototype, from the submodule power semiconductor thermal requirements to the overall system level integration. The high number of semiconductors and capacitor ...

This paper introduces a thermally-compensated magnetic hysteresis model, capable of accurately determining core losses of ferrite materials while accounting for core temperature variations. The employed model is based on permeance-capacitance analogy and i ...

The increase in the popularity of the medium voltage dc (MVDC) electrical distribution, as a possible evolution of the medium voltage ac (MVAC) electrical distribution for the ship on-board power systems, arises a need for a comparative evaluation and demo ...

Drazen Dujic

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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

Self-Synchronized Grid Impedance Estimation Unit using Interpolated DFT Technique

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

Hardware-in-the-Loop Characterization of Source-Affected Output Characteristics of Cascaded H-Bridge Converter

Galvanically Isolated Modular Converter

FEM Based Statistical Data-Driven Modeling Approach for MFT Design Optimization

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

Isolated DC/DC Structure Based on Modular Multilevel Converter

IGCT Switching Behaviour Under Resonant Operating Conditions

Electro-Thermal Design of a Modular Multilevel Converter Prototype

Thermally-Compensated Magnetic Core Loss Model for Time-Domain Simulations of Electrical Circuits

MVDC Supply Technologies for Marine Electrical Distribution Systems