| 摘要 |
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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