Green Solution for Insulation System of a Medium Frequency High Voltage Transformer for an Offshore Wind Farm

Mohammad Kharezy, Hassan Reza Mirzaei, Torbjörn Thiringer and Yuriy V. Serdyuk
Additional contact information
Mohammad Kharezy: RISE Research Institutes of Sweden, 50462 Borås, Sweden
Hassan Reza Mirzaei: Department of Electrical Engineering, University of Zanjan, Zanjan 45371-38791, Iran
Torbjörn Thiringer: Department of Electrical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
Yuriy V. Serdyuk: Department of Electrical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden

Energies, 2022, vol. 15, issue 6, 1-21

Abstract: 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.

Keywords: DC-DC power converters; design methodology; HVDC transmission; insulation design; power transformer; wind energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/6/1998/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/6/1998/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:6:p:1998-:d:767387

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().