| Summary: | This thesis presents and examines the concept that the output of a wound-rotor
induction generator (WRIG) can be limited by means of linking to external
impedances for wind-turbine generating system application.
An 80kW-WRIG is simulated as a model to examine the control of the output
power vs. speed characteristic. Model of WRIG derived from per phase equivalent
circuit is organized, then it is estimated how much external impedances affect the
characteristic of output power for it to approach to a typical wind-turbine curve.
Practical tests are performed using 80kW-WRIG in testing lab to validate the
simulation data. In addition, a smaller WRIG, connected on same shaft as 80kW-WRIG,
is designed to extend the range of wind speed. Also external impedances with
smaller WRIG are chosen to extract optimum power from wind-turbine.
Finally, passively controlled tandem WRIGs are shown to have the capability
to optimize wind-turbine energy extraction when controlled entirely by external
impedances. === Graduation date: 2003
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