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Green Solution for Insulation System of a Medium Frequency High Voltage Transformer for an Offshore Wind Farm
RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.ORCID iD: 0000-0002-0294-4430
University of Zanjan, Iran.
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
2022 (English)In: Energies, E-ISSN 1996-1073, Vol. 15, no 6, article id 1998Article in journal (Refereed) Published
Abstract [en]

High Voltage Direct Current (HVDC) transmission represents the most efficient way for transporting produced electrical energy from remotely located offshore wind farms to the shore. Such systems are implemented today using very expensive and large power transformers and converter stations placed on dedicated platforms. The present study aims at elaborating a compact solution for an energy collections system. The solution allows for a minimum of total transformer weight in the wind turbine nacelle reducing or even eliminating the need for a sea-based platform(s). The heart of the project is a Medium Frequency Transformer (MFT) that has a high DC voltage insulation towards ground. The transformer is employed in a DC/DC converter that delivers the energy into a serial array without additional conversion units. The insulation design methodology of an environmentally friendly HV insulation system for an MFT, based on pressboard and biodegradable oil, is introduced. The measurement method and results of the measurements of electrical conductivities of the transformer oil and Oil Impregnated Pressboard (OIP) are reported. The measurements show that the biodegradable ester oil/OIP conductivities are generally higher than the mineral oil/OIP conductivities. Numerical simulations reveal that the performance of the insulation system is slightly better when ester oil is used. Additionally, a lower temperature dependency for ester oil/OIP conductivities is observed, with the result that the transformer filled with ester oil is less sensitive to temperature variations. © 2022 by the authors.

Place, publisher, year, edition, pages
MDPI , 2022. Vol. 15, no 6, article id 1998
Keywords [en]
DC-DC power converters, Design methodology, HVDC transmission, Insulation design, Power transformer, Wind energy, DC transformers, DC-DC converters, Design, Electric utilities, Esters, HVDC power transmission, Insulation, Offshore oil well production, Oil filled transformers, Power transformers, DC/DC power converters, Direct current transmissions, Ester oil, Green solution, High voltage direct current transmission, High-Voltage Direct Current, Insulation system, Medium frequency transformer, Offshore wind farms
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:ri:diva-58890DOI: 10.3390/en15061998Scopus ID: 2-s2.0-85126298500OAI: oai:DiVA.org:ri-58890DiVA, id: diva2:1648372
Note

; Funding details: Energimyndigheten, 43048-1; Funding text 1: Funding: This research was funded by Swedish Energy Agency (Energimyndigheten, Project No. 43048-1) and Rise Research Institutes of Sweden.; Funding text 2: Acknowledgments: Funding from the Swedish Energy Agency and financial support Rise Research Institutes of Sweden is gratefully acknowledged, as are helpful research assistance from Morteza Eslamian and Oriol Guillén Sentís and conductivity measurements assistance from Joakim Rastamo and Marcus Svensson. Any remaining errors reside solely with the authors.

Available from: 2022-03-30 Created: 2022-03-30 Last updated: 2023-08-28Bibliographically approved

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Kharezy, Mohammad

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