Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1986-05-29
1987-09-22
Salce, Patrick R.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 47, 361 23, 361113, 333 12, 322 58, H02J 301, H02K 1900
Patent
active
046959394
ABSTRACT:
A synchronous machine with alternating-current exciter, wherein the stator of the exciter machine, the rotor of which runs in the opposite direction of rotation to that of the stator field, is fed from a three-phase power controller. The voltages induced in the rotor of the alternating-current machine are rectified by diodes in a three-phase star circuit. In order to minimize the effect of the voltage peaks originating from the hole-storage effect during the commutation of the diodes, which peaks are abnormally high as a result of the mutual interaction of the harmonics, there is produced a parallel path for high-frequency currents in the form of a protection circuit having low-pass characteristic so that the mutual interaction between stator and rotor harmonics if greatly reduced. Because of the risk of self-excitation, the elements of the protection circuit are matched to the machine and cause as few additional losses as possible. To reduce the voltage peaks at the diodes sufficiently and, at the same time, also keep the losses within acceptable limits, a reactor is connected in series after the three-phase power controller.
REFERENCES:
patent: 3532997 (1970-10-01), Faye
patent: 4491778 (1985-01-01), Knox et al.
patent: 4491903 (1985-01-01), Montague
patent: 4539617 (1985-09-01), Delaney et al.
Albert Kloss and Jean Heinrich "Der Kafigmoto mittlerer Leistung mit I-Umrichter" pp. 163-169, (1982).
"Burstenloses Erregungssytem Rotaduct fur Synchron-generatoren und-motoren mittlerer Leistung" Erich Schneider et al., pp. 145-148 (1968).
BBC Brown Boveri & Company Limited
Salce Patrick R.
Todd Voeltz Emanuel
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