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.

medium frequency transformer

HVDC insulation design

DC-DC power converters

prototype design methodology

finite element analysis

Wind energy

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, Elmaskiner och kraftelektronik

Calculation of the leakage inductance of medium frequency transformers having rectangular-shaped windings using an accurate analytical method

2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe),; (2019)

Paper i proceeding

Optimization and experimental validation of medium-frequency high power transformers in solid-state transformer applications

31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016; Long Beach Convention and Entertainment CenterLong Beach; United States; 20 March 2016 through 24 March 2016,; (2016)p. 3043 - 3050

Paper i proceeding

Design Methodology and Optimization of a Medium-Frequency Transformer for High-Power DC–DC Applications

IEEE Transactions on Industry Applications,; Vol. 52(2016)p. 4225-4233

Artikel i vetenskaplig tidskrift

Design methodology and optimization of a medium frequency transformer for high power DC-DC applications

2015 Thirtieth Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2015), 30th Annual IEEE Applied Power Electronics Conference and Exposition (APEC), Charlotte, NC MAR 15-19, 2015,; (2015)p. 2532-2539

Paper i proceeding

M. Kharezy, H. R. Mirzaei, M. Eslamian, T. Thiringer and Y. Serdyuk, “A Prototype Medium Frequency Transformer for a Sea-based Wind Farm Series HVDC Collection Network, Insulation Design”

M. Kharezy, H. R. Mirzaei, J. Rastamo, M. Svensson, Y. Serdyuk and T. Thiringer, “Performance of Insulation of DC/DC Converter Transformer for Offshore Wind Power Applications”

M. Kharezy, M. Eslamian, and T. Thiringer, "Estimation of the winding losses of Medium Frequency Transformers with litz wires using an equivalent permeability and conductivity method"

M. Eslamian, M. Kharezy and T. Thiringer, An accurate analytical method for leakage inductance calculation of high-power shell type medium frequency transformer with circular windings"

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Styrkeområden

Energi

Ämneskategorier

Annan elektroteknik och elektronik

Utgivare

Chalmers tekniska högskola

Online - please e-mail PhdAdm.e2@chalmers.se in advance to get the password

Online

Opponent: Dr.-Ing. Karsten Backhaus, Technical University of Dresden, Germany

Mer information

Senast uppdaterat

2021-01-14