Exjobbspresentation - Johannes Örnkloo

  • Datum: –14.00
  • Plats: Ångströmlaboratoriet sal 80101
  • Föreläsare: Johannes Örnkloo
  • Kontaktperson: Johannes Örnkloo
  • Seminarium

Comparison between active and passive rectification for different types of permanent magnet synchronous machines

In a permanent magnet generator the excitation field is caused by permanent magnets instead of coils. The rotor of a permanent magnet synchronous generator can be designed in different ways, the magnets can either be internally placed in the rotor or the magnets can be mounted on the surface of the rotor. The different types of rotor designs leads to different electrical properties, primarily the saliency of the rotor varies, the saliency refers to how much each pole piece protrudes from the rotor shaft.

When using a permanent magnet generator both active rectification and passive rectification are commonly used. Generators with varying saliency are likely differently affected when using active rectification or passive rectification. By examining how different types of generators are affected an indication as to which kind of setup is suitable for different applications can be achieved. The goal of this thesis was therefore to create simulation models of systems with a permanent magnet synchronous generator and a back-to-back converter as interface to the grid. By creating a simulation model using active rectification with IGBTs and a simulation model using passive rectification with diodes, a comparison of the systems for different saliency of the generator rotor was done. To verify the simulations an experimental setup has also been tested.

 

Handledare: Sandra Eriksson, Uppsala universitet
Ämnesgranskare: Rafael Waters, Uppsala universitet
Examinator: Petra Jönsson, Uppsala universitet
Opponent: Vilhelm Sjödin, Matteo Menniti