Internship – Validation of electromagnetic models for energy conversion applications (F/M)
SuperGrid Institute
Villeurbanne, Auvergne-Rhone-Alpes, France
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SuperGrid Institute brings together 180 employees, of 28 different nationalities who work together within a dynamic environment in the city of Lyon.

As an independent research and innovation center, we are dedicated to developing technologies for the future power transmission system, the supergrid , including HVDC & MVDC technologies.

As a multi-disciplinary research center with advanced simulation capabilities & multiple test platforms, including numerous associated laboratories, SuperGrid Institute uses its comprehensive expertise to provide a wide range of services and solutions to support our customers in developing power systems, equipment and components.

We specialise in system architecture and work on ensuring network security and stability while allowing for the integration of intermittent renewable energy sources.

Find out more by visiting our website : www.supergrid-institute.com

General Context

Program Power Electronics & Converters addresses power electronic converters for MVDC & HVDC. In particular, we develop AC-DC and DC-DC power converters, medium frequency transformers, power inductors and high voltage power electronics building blocks.

This internship will focus on the validation of electromagnetic and thermal models applied to medium frequency transformers and power inductors.

Magnetic core losses in a medium frequency context have to be accurately known, even with a DC bias. Medium frequency power conversion raises issues such as additional losses in the transformers and in the inductors conductors due to skin and proximity effects.

Medium frequency transformers are subject to high loss density and thus require accurate thermal sizing and usually dedicated cooling devices.

Various technological solutions exist in order to cope with those phenomena. SuperGrid Institute has developed models adapted to those solutions and now wants to validate them experimentally.

Objectives / Missions

Validation of previously developed electromagnetic and thermal models applied to medium frequency transformer and power inductor windings.

The considered models encompass :

  • Losses of magnetic material (Ferrite, nanocrystalline cores,..) under medium frequency signal, including DC bias
  • Losses of specific conductors (Litz cables, foils ) under medium frequency excitation.
  • Thermal behaviour of previously mentioned components including : Free or forced convection in application use casesThermal conductivity of anisotropic and composite structures
  • Experimental works will be based on electrical sources for the sample excitation and heat generation, as well as on thermocouples and thermal camera for thermal measurements.

    Data processing will be done using Matlab.

    Work definition :

  • Get familiar with the considered components, the physical phenomena, the chosen models and the results of previous work.
  • Learn how to use the existing samples, the excitation apparatuses and the measurements means.
  • Define and execute the experimental validation plan.
  • Compare the results of the experimental work with the models
  • Summarize the study in a synthesis report.
  • Present the study and discuss the relevancy of the models
  • The content of the internship may be adjusted depending on the work progress.

    Candidate Profile

    Master or engineering school student in 5th year of his / her studies or in gap year. The student must have a good knowledge in electrical and magnetic systems but also in physics.

    The candidate must show interest in experimental work as well as in research subjects and modelling (analytical and numerical).

    He / she must be familiar with the basics of scientific programming (Matlab). Autonomy, self-discipline and curiosity will be appreciated.

    Fluency in English is welcome.

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