| 摘要 |
PROBLEM TO BE SOLVED: To provide a conversion device for storage battery capable of prolonging the lifetime of a storage battery, a power supply system, and a power supply control method.SOLUTION: The conversion device for storage battery comprises: a voltage conversion part capable of performing a discharging operation for converting a DC voltage from a storage battery and supplying the voltage to a line, and a charging operation for converting a DC voltage from the line and supplying the voltage to the storage battery; and a control part for controlling the charging operation and the discharging operation of the voltage conversion part. When a power storage amount in the storage battery is increased and becomes equal to or more than an upper limit value of the power storage amount, the control part starts first control for avoiding the charging operation. When the power storage amount in the storage battery is decreased and becomes equal to or less than a target value of the power storage amount, the control part stops the first control. When the power storage amount in the storage battery is decreased and becomes equal to or less than a lower limit value of the power storage amount, the control part starts second control for avoiding the discharging operation. When the power storage amount in the storage battery is increased and becomes equal to or more than the target value of the power storage amount, the control part stops the second control. |
