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dr Piotr Dworakowski
Employment
- Power converters team leader at SuperGrid Institute
Keywords Help
- dc collector network
- high voltage power converters
- -ferrite core, gapped magnetic core, hysteresis loop, medium frequency transformer, power loss, preisach model, preisach distribution function
- average air gap length
- dc-dc power converters
- high frequency power converter
- hvdc
- hysteresis loop
- magnetic permeability
- magnetizing inductance
Publications
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total: 25
Catalog Publications
Year 2022
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Modified Preisach model of hysteresis in multi air gap ferrite core medium frequency transformer
PublicationThis article presents the modified Preisach model of hysteresis for a 3-phase medium frequency transformer in a 100 kW dual active bridge converter. The transformer magnetic core is assembled out of ferrite I-cores, which results in multiple parasitic air gaps. For this transformer, the hysteresis loops were measured and parameters of the Preisach model were determined. The Preisach distribution function is approximated with a...
Year 2020
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Effective Permeability of Multi Air Gap Ferrite Core 3-Phase Medium Frequency Transformer in Isolated DC-DC Converters
PublicationThe magnetizing inductance of the medium frequency transformer (MFT) impacts the performance of the isolated dc-dc power converters. The ferrite material is considered for high power transformers but it requires an assembly of type “I” cores resulting in a multi air gap structure of the magnetic core. The authors claim that the multiple air gaps are randomly distributed and that the average air gap length is unpredictable at the...
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Experimental EMI study of a 3-phase 100kW 1200V Dual Active Bridge Converter using SiC MOSFETs
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Experimental validation and comparison of a SiC MOSFET based 100 kW 1.2 kV 20 kHz three-phase dual active bridge converter using two vector groups
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How Good are the Design Tools in Power Electronics?
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Impact of DC fault blocking capability on the sizing of the DC-DC Modular Multilevel Converter
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Modelling and analysis of medium frequency transformers for power converters
PublicationThe evolutions in power systems and electric vehicles, related to the economic opportunities and the environmental issues, bring the need of high power galvanically isolated DC-DC converter. The medium frequency transformer (MFT) is one of its key components, enabled by the increasing switching frequency of modern power semiconductors like silicon carbide transistors or diodes. The increased operating frequency offers small...
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Modelling of a 25 kV-50 Hz Railway Infrastructure for Harmonic Analysis
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Unidirectional thyristor-based DC-DC converter for HVDC connection of offshore wind farms
Publication
Year 2019
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3-phase medium frequency transformer for a 100kW 1.2kV 20kHz Dual Active Bridge converter
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Assessment of the Impact of Split Storage within Modular Multilevel Converter
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Cost-performance framework for the assessment of Modular Multilevel Converter in HVDC transmission applications
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Influence of the operating frequency on DC-DC converters for HVDC grids
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NPC assessment in insulated DC/DC converter topologies using SiC MOSFETs for Power Electronic Traction Transformer
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Overview of DC–DC Converters Dedicated to HVdc Grids
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Power Hardware In-the-Loop validation of DC-DC power converter for offshore wind energy
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Requirements for interconnection of HVDC links with DC-DC converters
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Study of the impact of DC-DC converters on the protection strategy of HVDC grids
Publication
Year 2018
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A 100 kW 1.2 kV 20 kHz DC-DC converter prototype based on the Dual Active Bridge topology
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Determination of Mathematical Model Parameters of a Medium Frequency Transformer
PublicationThe paper presents the results of experimental studies of the medium frequency transformer. The object of the research was a prototype of a single-phase transformer with a core made of ferrite I-core elements and windings made of Litz conductors. The research was carried out to determine the parameters of the transformer's mathematical model. The scope of the tests included determining the magnetic hysteresis loop and measuring...
Year 2017
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Design of a SiC based triple active bridge ceil for a multi-megawatt DC-DC converter
PublicationThe paper describes the design methodology of a novel Triple Active Bridge cell used as the building block for modular DC-DC converters. The intended application is for Medium Voltage Direct Current grids, such as the DC collector for offshore wind farms. The latest generation of SiC MOSFET semiconductors is utilized to operate in the medium frequency range while optimizing the efficiency. The dimensioning of the main cell components,...
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Hysteresis modelling of a medium frequency single-phase transformer
PublicationThe article describes a feedback Preisach hysteresis model equivalent circuit implementation of a medium frequency single-phase transformer being a part of a high power and high efficiency DC-DC converter. The macroscopic models of magnetic hysteresis are introduced and the feedback Preisach model is selected for further analysis. The hysteresis model is developed for a prototype transformer and the hysteresis loops are compared...
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Potential of silicon carbide MOSFETs in the DC/DC converters for future HVDC offshore wind farms
Publication
Year 2016
Year 2009
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