| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size and cost of a battery power storage system which injects the electric power from a secondary battery into the DC bus of a DC power distribution system. SOLUTION: In a battery power storage system which injects the electric power from a secondary battery 20 charged by means of an AC system 1 into the DC bus 5 of the DC power distribution system connected to the system 1, a power converter 21 is constituted of an inverter 22 which makes high-frequency conversion on the output voltage of the battery 20, a transformer 23 which boosts the output of the inverter 22, and a rectifier 24 which rectifies the output of the transformer 23 and electric power is injected into the bus 5 from the battery 20 by adjusting the output voltage of the rectifier 24 by controlling the output voltage of the inverter 22 based on the power fluctuation in the bus 5. Since the frequency of the inverter 22 is raised, the capacity, size, and cost of the power converter 21 are reduced.
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