A Novel Oil-immersed Medium Frequency Transformer for Offshore HVDC Wind Farms
Licentiatavhandling, 2020
In this project, a design of an oil type medium frequency transformer for offshore wind farm applications is proposed. The design is intended for applications when series coupling of the output of the DC/DC converters of the wind turbine on their secondary side is done to achieve a cost-effective high voltage solution for collecting energy from offshore wind parks. The focus of the work is on the insulation design of the high voltage side of a medium frequency transformer where the magnetic design constraints should also be satisfied.
Above all, a proof of concept is made demonstrating a possible solution for the design of the transformer for such a DC/DC converter unit. The transformer suggested is using oil/paper as insulation medium. Furthermore, characterisation of an eco-friendly biodegradable transformer oil for this type of HVDC transformer application is made. Moreover, an introduction of reliable high frequency characterisation test methods to medium frequency transformer designers is made. In addition, the Non-Linear Maxwell Wagner (NLMW) relations are further developed to form a method for the development of an HVDC MFT transformer. All in all, the DC series concept has been further developed one step closer to pre-commercialization, i.e. from TRL 1 to about 2.
Above all, a proof of concept is made demonstrating a possible solution for the design of the transformer for such a DC/DC converter unit. The transformer suggested is using oil/paper as insulation medium. Furthermore, characterisation of an eco-friendly biodegradable transformer oil for this type of HVDC transformer application is made. Moreover, an introduction of reliable high frequency characterisation test methods to medium frequency transformer designers is made. In addition, the Non-Linear Maxwell Wagner (NLMW) relations are further developed to form a method for the development of an HVDC MFT transformer. All in all, the DC series concept has been further developed one step closer to pre-commercialization, i.e. from TRL 1 to about 2.
medium frequency transformer
HVDC insulation design
Wind energy
prototype design methodology
finite element analysis
DC-DC power converters
Online - please e-mail PhdAdm.e2@chalmers.se in advance to get the password
Opponent: Dr.-Ing. Karsten Backhaus, Technical University of Dresden, Germany
Författare
Mohammad Kharezy
Chalmers, Elektroteknik, Elkraftteknik
Insulation design of a medium frequency power transformer for a cost-effective series high voltage dc collection network of an offshore wind farm
Lecture Notes in Electrical Engineering,;Vol. 599 LNEE(2020)p. 1406-1417
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Calculation of the leakage inductance of medium frequency transformers having rectangular-shaped windings using an accurate analytical method
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Challenges with the design of cost effective series DC collection network for offshore wind farm
Övrigt konferensbidrag
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Design Methodology and Optimization of a Medium-Frequency Transformer for High-Power DC–DC Applications
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Design methodology and optimization of a medium frequency transformer for high power DC-DC applications
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Paper i proceeding
Green Solution for Insulation System of a Medium Frequency High Voltage Transformer for an Offshore Wind Farm
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Performance of Insulation of DC/DC Converter Transformer for Offshore Wind Power Applications
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Estimation of the winding losses of Medium Frequency Transformers with Litz wire using an equivalent permeability and conductivity method
2020 22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe,;(2020)
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Optimum Leakage Inductance Determination for a Q2L-Operating MMC-DAB with Different Transformer Winding Configurations
20th IEEE International Symposium on Power Electronics (Ee),;(2019)
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Drivkrafter
Hållbar utveckling
Innovation och entreprenörskap
Styrkeområden
Energi
Ämneskategorier (SSIF 2011)
Annan elektroteknik och elektronik
Utgivare
Chalmers
Online - please e-mail PhdAdm.e2@chalmers.se in advance to get the password
Opponent: Dr.-Ing. Karsten Backhaus, Technical University of Dresden, Germany