1. Rotating and Linear Synchronous Generators for Renewable Electric Energy Conversion - an Update of the Ongoing Research Projects at Uppsala University Presenter: Björn Bolund Author: whole group

4. Research Areas A.Water Current Energy B.Bio-fuelled plants C.Wave Energy D.Wind Energy E.Hydro Power F.Pulsed power ?

5. Water current energy Velocities ~ 1 m/s At high velocities Only on a few places Power-rating ~ 10 kW and upp Permanent magnets

6. Bio-fuelled plants Process Turbogenerator Drawbacks: Cooling is expensive Our approach: High voltage 136 kV / 42 MW

7. Why high voltage? Poynting’s theorem The rate at which electromagnetic energy is dissipated into heat per unit volume Poynting vector Trad XLPE E(kV/mm) 2.5 - 33 - 15 A/mm 4 – 4.5 1.5 – 3 P/mm 10-13.5 4.5 - 45 2 3

8. Buoy Rope Linear generator Wave energy – The linear generator

9. Rotor Stator Current Neodymium-Iron-Boron magnetsThreephse winding, standardcable

10. Wind energy Generator Increase overload capabillity

11. Hydropower -elliptic rotor - Eccentric rotor

12. Pulsed power High power pulses: 100MW – 10TW during a few microseconds 80 KV 5.5 kA 0.5 GW 2.5 micro seconds