Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1976-02-11
1978-10-24
Shoop, William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 58, 363 68, H02M 112
Patent
active
041225155
ABSTRACT:
This invention is applied to a power converter with a converting apparatus comprising one or more units including only controlled rectifiers or combination of controlled rectifiers and non-controlled rectifiers, said converting apparatus being connected with an AC power source, whereby high harmonic currents generated in the AC circuit during commutating periods are reduced.
In the present invention, at the commutating period of the converting apparatus, the reactance in the AC circuit of the converter is changed to increase in accordance with change of the AC current of the converting apparatus, so that the change of the AC current during the commutating period is made more slowly thereby reducing high harmonic currents.
REFERENCES:
patent: 3292072 (1966-12-01), Hylten-Cavallius et al.
patent: 3321695 (1967-05-01), Augier
patent: 3332000 (1967-07-01), Greening et al.
patent: 3355654 (1967-11-01), Risberg
patent: 3487287 (1969-12-01), Demarest
patent: 3808510 (1974-04-01), Dubrovin
patent: 3863119 (1975-01-01), Tashibana
patent: 4030018 (1977-06-01), Tsuboi
Goto Takao
Hatano Shigeru
Matsutake Mitsugu
Miura Shozuchi
Nozaki Yoshio
Hitachi , Ltd.
Shoop William M.
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