FEEDING METHOD AND FEEDING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a feeding method less wasting the power expense and small in influence upon a load due to the instantaneous drop of a voltage of a feeding line.

SOLUTION: The feeding method prevents loss induced by the instantaneous drop of a voltage by using a first feeding system 13 that charges a secondary battery 6 from the feeding line 10 via an AC/DC conversion device 4 and feeds a load 8 from the secondary battery 6 via a DC/AC conversion device 5. A second feeding system 14 is prepared that feeds the load 8 from the feeding line 10 via a switch circuit 9 that is paralleled off by the voltage drop of the feeding line 10: a first total money amount of a power-loss estimated money amount at feeding by the first feeding system 13 and a load-loss estimated amount due to loss at the load 8 is calculated every prescribed time; a second total money amount of a power-loss estimated money amount at feeding by the second feeding system and the load-loss estimated money amount is calculated; the first feeding system 13 or the second feeding system 14 is selected according to the result of the comparison of both the total money amounts; and the load 8 is fed by the selected feeding system.

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