| 摘要 |
PROBLEM TO BE SOLVED: To provide a charging method for a power storage system using a multistage charging system, capable of charging a battery 5 within a range which does not exceed the contract power, even in the nighttime when the battery is charged and a power charge rate is low. SOLUTION: This charging method includes a system in which at nighttime, the battery 5 charges power, from a commercial power supply 1 in multi-stage format using a bidirectional converter 4, while decreasing a charging power value stepwise, and in the daytime when power is demanded, the power from the battery 5 is supplied to a load 2 using the bidirectional converter 4. The total consumed power (W) from the commercial power supply 1 is measured at nighttime, when the battery 5 is charged. When the total consumed power (W) from the power supply 1 exceeds a threshold set established within the contact power, the bidirectional converter 4 is controlled so as to perform charging, while lowering the charging power value by one level; and at this time, the threshold set at nighttime is made variable, corresponding to a value discharged in daytime. COPYRIGHT: (C)2005,JPO&NCIPI
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