Publications by Drazen Dujic | EPFL Graph Search

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Utilization of the Integrated Gate Commutated Thyristor as a semiconductor switch in the Series Resonant Converter for isolated medium voltage DC-DC conversion offers an opportunity for high conversion efficiency while operating at the high switching frequ ...

The desire to increase the voltage of DC shipboard power distribution networks to the medium voltage level derives from the pressure to reduce the operating costs of such systems by increasing their efficiency. Solid state bus-tie switches are accepted to ...

Medium-voltage direct-current (MVDC) distribution is a possible replacement due to the advancements in power electronic technologies, for existing medium-voltage ac distribution on ships. The new systems based on MVDC are expected to increase fuel efficien ...

This paper provides detailed analytical modeling and finite elements method (FEM) analysis of the thermal behavior of the medium frequency transformer (MFT). A comprehensive analytical model in form of a thermal network consisting of conduction, convection ...

Dual-channel gate driver is commonly utilized in the industry for accommodating the widespread use of half-bridge power modules. As wide-bandgap devices become increasingly prevalent due to their superior switching characteristics compared with conventiona ...

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 ...

The branch paralleling represents one of the available options with regards to the modular multilevel converter power extension. In such a case, the main technical challenge resides in the control domain, whereas a new set of possibilities from the voltage ...

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 ...

The control of a modular multilevel converter can be achieved in various ways. Traditionally, upper-layer energy controllers and middle-layer current controllers are centrally implemented. In some hardware realizations, the submodules also include a local ...

The size and position difference of the windings determine the leakage flux path and give rise to unbalance of the short-circuit impedances, which strongly affects the transient behaviour of the transformer. This work proposes a new approach of modelling w ...

Magnetic components using soft core materials are widely used in power electronic converters. The hysteresis effect of the material leads to power loss and harmonic distortion. If this effect can be modelled in system-level time-domain simulation, the perf ...

The duty-cycle control is a popular option for current limiting in LLC resonant converters. Such current limiting is required to protect the converter either during the start-up or during an overload. Although this method proved to be effective, the switch ...

This paper discusses the technical challenges and trade-offs tied to design of medium frequency transformers (MFTs) for medium-voltage (MV) high-power (HP) power electronic applications, namely emerging solid state transformers (SSTs). A detailed analysis ...

Recently, IGCTs have shown a great potential for the soft-switching dc transformer applications based on LLC resonant converter. The zero-voltage switching that is present in this converter topology enables an operation of IGCTs without clamping circuit an ...

In two-stage solid-state transformers with input-series output-parallel structure, the LLC converter operating at a fixed switching frequency is a common choice for the isolated DC/DC conversion stage because it can provide a high efficiency and a fixed vo ...

Solid-State Transformers with Input-Series/Output-Parallel configuration offer a convenient solution for AC/DC conversion due to their scalability and modularity. In this configuration, each module experiences a second-order harmonic ripple caused by local ...

This paper presents a robust design of a megawattscale medium-voltage (MV) direct current transformer (DCT) that features a bidirectional LLC resonant converter topology. This topology harnesses the inherent ability to control power flow seamlessly between ...

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 ...

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 ...

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 ...

Drazen Dujic

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IGCT Low-Current Switching – TCAD and Experimental Characterization

Four Quadrant Bus-Tie Switch for Protection of Shipboard Power Systems

Dynamic Assessment of Source–Load Interactions in Marine MVDC Distribution

Thermal Modeling and Experimental Verification of an Air Cooled Medium Frequency Transformer

A Dual-Channel Gate Driver Design with Active Voltage Balancing Circuit for Series Connection of SiC MOSFETs

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

Modulation Considerations for Modular Multilevel Converter Operating with Parallel Branches and Phase-Shifted Carriers

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

Impact of the Distributed Current Controller on the Dynamic Performance of the Modular Multilevel Converter

Leakage Flux Modelling of Multi-Winding Transformer using Permeance Magnetic Circuit

Modelling Hysteresis of Soft Core Materials using Permeance-Capacitance Analogy for Transient Circuit Simulations

Equal Loss Distribution in Duty-Cycle Controlled H-Bridge LLC Resonant Converters

Sensitivity Analysis of Medium Frequency Transformer Design

An IGCT Gate Unit for Zero-Voltage-Switching Resonant DC Transformer Applications

Ripple Voltage and Loss Reduction of Single-Phase ISOP SST by Eliminating the Second Harmonic Current in LLC Converters

Stability Analysis of Input-Series/Output-Parallel Solid-State Transformers Equipped with Second-Order Harmonic Active Power Filters

Design of a Megawatt-Scale IGCT-Based Medium-Voltage Direct Current Transformer

Direct Current Transformer Impact on the DC Power Distribution Networks

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

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