Since 1986 experimental investigations have been made at the Technical University of Munchen on the influence of converter-feeding of the field-circuit of a three-phase synchronous generator with a superconducting field winding. The investigations were promoted by the German Research Community. Four various converter circuits have been tested: B6 three-phase bridge, two parallel B6 three-phase bridges, a three-phase bridge with bypass-thyristors and a high current Power-MOSFET converter. Steady state and transient operation have been tested. There was special interest in the harmonics generated by the converter circuits and their power dissipation in the low temperature region. The thermal reaction of the field-circuit has been considered, too. Finally a method has been developed to prevent the superconducting winding from the so-called 'quench' in transient operation.
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