Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1992-08-11
1994-06-28
Stephan, Steven L.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 41, 363 80, 307 51, H02M 108
Patent
active
053252853
ABSTRACT:
A parallel running control apparatus for two PWM inverters includes a first and a second electric current detector for detecting AC output electric current of the PWM inverters; a first and a second electric current control circuit for outputting, on the basis of the output electric current, three-phase voltage command values of the corresponding inverters; and a first and a second pulse generating circuit for outputting, on the basis of the three-phase voltage command values, command pulses which controllably turn on and off the corresponding inverters. This apparatus also includes a first and a second driver circuit for turning, on the basis of the command pulses, on and off switching elements of the corresponding inverters; a circulating current computing element for computing, on the basis of the output electric current, a circulating current flowing between the two inverters; and a parallel running inhibition circuit for interrupting one inverter when the circulating current computed by the circulating current computing element exceeds a predetermined value.
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Davidson Ben
Mitsubishi Denki & Kabushiki Kaisha
Stephan Steven L.
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