Thermal behavior of grainoriented electrical steel wound core solid-state transformer

• Houssam Ichou ^[1] ; Daniel Roger ^[1] ; Mathieu Rossi ^[1]
  1. [1] Univ-Artois, France
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 41, Nº 2, 2022, págs. 732-751
• Idioma: inglés
• Enlaces
  • Texto completo
• Resumen

  • Purpose – This paper aims to propose a new design for high-power compact solid-state transformers (SSTs) made with grain-oriented electrical steel (GOES) wound cores that benefit from the natural reduction of iron losses at high temperatures.

    Design/methodology/approach – An experimental approach, coupled with numerical and analytical investigations, is widely used for proving the validity of the proposed concept.

    Findings – With cores much hotter than coils, the new design of medium frequency transformers can be used for building compact SSTs that rated powers and common-mode insulation voltages much higher than existing ones with similar efficiencies.

    Research limitations/implications – The thermal design must provide a large difference between core and coil temperatures in a reasonable volume.

    Practical implications – The increasing number of intermittent renewable sources place electric grid stability at risk. Smart nodes, made of SSTs, improve the global grid stability because they are able to provide real-time control of energy fluxes at critical points. In railway applications, high-power SST cells can be distributed along the train providing a larger volume for passengers.

    Social implications – The increasing part of electricity in a flexible grid requires performant and highpower SSTs made with components that have an environmental footprint as low as possible.

    Originality/value – This paper proves that the design of high-power transformers with GOES wound cores much hotter than coils is possible. It proposes also a thermal equivalent circuit that helps the design