CROSS FLOW SUPPRESSION DEVICE IN PARALLEL SYSTEM OF UNINTERRUPTIBLE POWER SUPPLY

摘要

PROBLEM TO BE SOLVED: To provide a cross flow suppression device in a parallel system of an uninterruptible power supply in which parallel operation can be performed while satisfactorily partially charging a current by suppressing a cross flow.;SOLUTION: A cross flow suppression device comprises: voltage control circuits 40₁, 40₂ in which an output voltage command value is determined by regulating a frequency and a voltage amplitude in accordance with detection amounts of valid power and invalid power for UPSs 10₁, 10₂, respectively, and a voltage command value of each of the UPSs 10₁, 10₂ is determined on the basis of a deviation between the command value and an output voltage detection value of each of the UPSs 10₁, 10₂; and voltage command value correction sections 50₁, 50₂ in which deviations between an average current value obtained by dividing a load current Iload by the number of connected UPSs and output current detection values Iups1, Iups2 of the UPSs are determined as voltage command correction values and the voltage command correction values are respectively added to the voltage command values of the UPSs determined in the voltage control circuits 40₁, 40₂. The UPSs 10₁, 10₂ are driven and controlled in accordance with the voltage command values of the UPSs to each of which the corresponding voltage command correction value has been added.;COPYRIGHT: (C)2014,JPO&INPIT