| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power unit which can automatically compensate the voltage drop of a cable without adding a new circuit or without increasing the lateral current between devices, in a parallel system of uninterruptible power units. <P>SOLUTION: The parallel system, where a plurality of uninterruptible power units 1A-1C equipped with inverters for converting DC power into AC are used in parallel, includes a voltage standard generating means 20 which generates the output voltage standard of the inverter 11 in each uninterruptible power unit, a load average current calculating means 23 which calculates a load average current that each uninterruptible power unit should flow balancedly to the load, and an output voltage correcting circuit 24 which corrects the output voltage of the inverter by the average current of the load. <P>COPYRIGHT: (C)2007,JPO&INPIT |
