Patent ID: 9685799
Date: 2017-06-20
CPC Classifications: H02J

Claim:
1. A storage battery control device for controlling charge and discharge of a storage battery to regulate power system frequency of an electric power system, the storage battery control device comprising: a frequency obtainer that obtains the power system frequency; a charge level meter that measures a charge level of the storage battery; a setter that sets a charging rate or a discharging rate according to the obtained power system frequency, the charging rate being a rate at which the storage battery is charged to approximate the power system frequency to rated frequency, the discharging rate being a rate at which the storage battery is discharged to approximate the power system frequency to the rated frequency; an adjuster that adjusts the charging rate or the discharging rate set by the setter, according to the obtained power system frequency and the measured charge level; and a charge and discharge controller that controls charge and discharge of the storage battery based on the adjusted charging rate or the adjusted discharging rate, wherein the adjuster: when (i) the measured charge level is lower than a lower limit of a normal range and (ii) the obtained power system frequency is within a first non-sensitive zone ranging from a first frequency lower than the rated frequency to the rated frequency, adjusts the charging rate set by the setter to decrease the charging rate to a predetermined percentage of the charging rate; and when (i) the measured frequency is higher than an upper limit of the normal range and (ii) the obtained power system frequency is within a second non-sensitive zone ranging from a second frequency higher than the rated frequency to the rated frequency, adjusts the discharging rate set by the setter to decrease the discharging rate to a predetermined percentage of the discharging rate.