Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1991-12-16
1994-09-06
Beha, William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 44, 307105, H02M 112
Patent
active
053453751
ABSTRACT:
A circuit is provided for generating a current that is a harmonic of the frequency of the utility system and which is of a selected amplitude and phase to reduce the total harmonic distortion of a system that converts alternating current to direct current, or vice versa. The DC signal is sampled and by controlling switches, a sinusoidal current at the desired harmonic is generated, and is provided to impedance network that injects this current into the multiphase AC system used by the utility in a very low cost, easily controlled, and highly effective manner. The impedance network comprises a single inductor and capacitance connected in series through each of the phases of the utility, with the current signal having an amplitude that is selected to substantially eliminate harmonics which cause high distortion of the utility signal.
REFERENCES:
patent: 4730243 (1988-03-01), Glennon
Beha William H.
Regents of the University of Minnesota
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