Control device, control method, and control program of storage battery and electricity storage system

A control device of a storage battery, comprising:

• a first obtaining unit configured to obtain first information indicative of an electricity price set for each time slot;
• a second obtaining unit configured to obtain second information indicative of charge/discharge efficiencies of the storage battery;
• a first calculating unit configured to calculate first electric energy charged in the storage battery;
• a second calculating unit configured to calculate second electric energy of the storage battery dischargeable from the storage battery to a load, based on the first electric energy and the charge/discharge efficiencies;
• a third calculating unit configured to calculate a unit charging price per unit electric energy required to charge the second electric energy based on the second electric energy, the electricity price in the time slot during which the storage battery is charged, the first electric energy, and the charge/discharge efficiencies;
• a basic schedule determining unit configured to cause the storage battery to perform a discharge to the load, cause the electric power system to charge the storage battery, and stop the storage battery based on a result of a comparison between a ratio of the electricity prices in the different time slots and the charge/discharge efficiencies;
• and
• a correction control unit configured to compare the electricity price with the unit charging price in the time slot during which the storage battery is determined to be stopped by the basic schedule determining unit, cause an electric power system to charge the storage battery when the electricity price is lower than the unit charging price, and cause the storage battery to perform a discharge to the load when the electricity price is equal to or higher than the unit charging price.

A control method of a storage battery, comprising:

• obtaining first information indicative of an electricity price set for each time slot;
• obtaining second information indicative of charge/discharge efficiencies of the storage battery;
• calculating first electric energy charged in the storage battery;
• calculating second electric energy of the storage battery dischargeable from the storage battery to a load, based on the first electric energy and the charge/discharge efficiencies;
• calculating a unit charging price per unit electric energy required to charge the second electric energy based on the second electric energy, the electricity price in the time slot during which the storage battery is charged, the first electric energy, and the charge/discharge efficiencies;
• and
• comparing the electricity price with the unit charging price in each of the time slots, causing an electric power system to charge the storage battery when the electricity price is lower than the unit charging price, causing the storage battery to perform a discharge to the load when the electricity price is equal to or higher than the unit charging price.

A control program of a storage battery for causing a computer to execute:

• obtaining first information indicative of an electricity price set for each time slot;
• obtaining second information indicative of charge/discharge efficiencies of the storage battery;
• calculating first electric energy charged in the storage battery;
• calculating second electric energy of the storage battery dischargeable from the storage battery to a load, based on the first electric energy and the charge/discharge efficiencies;
• calculating unit charging price per unit electric energy required to charge the second electric energy based on the second electric energy, the electricity price in the time slot during which the storage battery is charged, the first electric energy, and the charge/discharge efficiencies;
• and
• comparing the electricity price with the unit charging price in each of the time slots, cause an electric power system to charge the storage battery when the electricity price is lower than the unit charging price, and cause the storage battery to perform a discharge to the load when the electricity price is equal to or higher than the unit charging price.

An electricity storage system, comprising:

• a storage battery;
• and
• a control device configured to control a charge and a discharge of the storage battery, wherein
• the control device includes:
• a first obtaining unit configured to obtain first information indicative of an electricity price set for each time slot;
• a second obtaining unit configured to obtain second information indicative of charge/discharge efficiencies of the storage battery;
• a first calculating unit configured to calculate first electric energy charged in the storage battery;
• a second calculating unit configured to calculate second electric energy of the storage battery dischargeable from the storage battery to a load, based on the first electric energy and the charge/discharge efficiencies;
• a third calculating unit configured to calculate a unit charging price per unit electric energy required to charge the second electric energy based on the second electric energy, the electricity price in the time slot during which the storage battery is charged, the first electric energy, and the charge/discharge efficiencies;
• and
• a control unit configured to compare the electricity price with the unit charging price in each of the time slots, cause an electric power system to charge the storage battery when the electricity price is lower than the unit charging price, and cause the storage battery to perform a discharge to the load when the electricity price is equal to or higher than the unit charging price.