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

Author

Listed:
  • Mohammad Kharezy

    (RISE Research Institutes of Sweden, 50462 Borås, Sweden
    Department of Electrical Engineering, Chalmers University of Technology, 41296 Göteborg, 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)

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.

Suggested Citation

  • Mohammad Kharezy & Hassan Reza Mirzaei & Torbjörn Thiringer & Yuriy V. Serdyuk, 2022. "Green Solution for Insulation System of a Medium Frequency High Voltage Transformer for an Offshore Wind Farm," Energies, MDPI, vol. 15(6), pages 1-21, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:6:p:1998-:d:767387
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    References listed on IDEAS

    as
    1. Pawel Rozga & Abderrahmane Beroual & Piotr Przybylek & Maciej Jaroszewski & Konrad Strzelecki, 2020. "A Review on Synthetic Ester Liquids for Transformer Applications," Energies, MDPI, vol. 13(23), pages 1-33, December.
    2. Patrick Rumpelt & Frank Jenau, 2017. "Oil Impregnated Pressboard Barrier Systems Based on Ester Fluids for an Application in HVDC Insulation Systems," Energies, MDPI, vol. 10(12), pages 1-10, December.
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