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

Research Areas

A. Water Current EnergyB. Bio-fuelled plantsC. Wave EnergyD. Wind EnergyE. Hydro Power

F. Pulsed power

?

Water current energy

Velocities ~ 1 m/s

At high velocities

Only on a few places

Power-rating ~ 10 kW and upp

Permanent magnets

Bio-fuelled plants

Process

Turbogenerator

Drawbacks:

Cooling is expensive

Our approach:

High voltage

136 kV / 42 MW

Why high voltage?

Poynting’s theoremThe rate at which electromagnetic energy isdissipated into heat per unit volume

tJ

t

f

f

DH

B

BE

D

0

EJ fw V fVloss dwdW EJ

V V fS

ddt

d

EJBE

εaHE22

22

HES Poynting vector

Trad XLPEE(kV/mm) 2.5 - 3 3 - 15A/mm 4 – 4.5 1.5 – 3P/mm 10-13.5 4.5 - 45

2

3

Buoy

Rope

Linear generator

Wave energy – The linear generator

Rotor

Stator

Current

Neodymium-Iron-Boron magnets Threephse winding, standardcable

Wind energy

GeneratorIncrease overload capabillity

Hydropower

-elliptic rotor- Eccentric rotor

Pulsed power

High power pulses: 100MW – 10TW during a few microseconds

80 KV5.5 kA0.5 GW2.5 micro seconds