Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1993-02-18
1995-08-29
Stephan, Steven L.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 55, 363 95, 307 58, 307 82, H02M 7515, H02J 338
Patent
active
054466458
ABSTRACT:
In a uninterruptible power supply in which a plurality of inverters are operated in parallel, a current control loop is provided which responds to the magnitude of an output current of each inverter brought into parallel running to change a command value for a voltage waveform control circuit associated with each inverter, and the gain of the current control loop is made to be variable, whereby currents shared by the inverters can be set desirably to effectively suppress a cross current flowing between the inverters upon establishment of parallel running.
REFERENCES:
patent: 3864620 (1975-02-01), Abbondanti
patent: 4947310 (1990-08-01), Kawabata et al.
patent: 5121314 (1992-06-01), Moriya
patent: 5191519 (1993-03-01), Kawakami
patent: 5257180 (1993-10-01), Sashida et al.
Inukai Satoru
Jifuku Yorito
Kobayashi Akira
Mino Tomoaki
Sakurai Yoshimi
Berhane Adolf
Hitachi , Ltd.
Stephan Steven L.
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