Electric power control method, electric power control device, and electric power control system

An electric power control device comprising:

• at least one memory;
• and circuitry operative to:
• determine a control threshold value at a start of a demand time period based on a demand target value;
• measure an amount of demand electric power of a customer which has received an electric power supply from an external power source and consumed electric power from the start of the demand time period to a time point of update during the demand time period;
• compare the measured amount of demand electric power with a total amount which is observed when consumption of electric power with a fixed demand target value is continued from the start of the demand time period to the time point of update,
• update the control threshold value based on the measured amount of demand electric power and the demand target value;
• and
• supply electric power to the customer from a distributed power source when an instantaneous value of an electric power consumption of the customer exceeds the control threshold value during the demand time period, wherein
• when the amount of demand electric power is smaller than the total amount, the update is performed by increasing the control threshold value, and
• when the amount of demand electric power is greater than the total amount, the update is performed by reducing the control threshold value,
• wherein, when the amount of demand electric power is smaller than the total amount, the update is performed by dividing a value obtained by subtracting the amount of demand electric power from the total amount by a time from the time point of update to an end of the demand time period and adding the value obtained by division to the control threshold value.

An electric power control system comprising an electric power control device and a storage battery that is connected to the electric power control device via a communication network, wherein

• the electric power control device includes
• at least one memory;
• and circuitry operative to:
• determine a control threshold value at a start of a demand time period based on a demand target value;
• measure an amount of demand electric power of a customer which has received an electric power supply from an external power source and consumed electric power from the start of the demand time period to a time point of update during the demand time period;
• compare the measured amount of demand electric power with a total amount which is observed when consumption of electric power with a fixed demand target value is continued from the start of the demand time period to the time point of update;
• update the control threshold value based on the measured amount of demand electric power and the demand target value;
• and
• supply electric power to the customer from a distributed power source when an instantaneous value of an electric power consumption of the customer exceeds the control threshold value during the demand time period, wherein
• when the amount of demand electric power is smaller than the total amount, the update is performed by increasing the control threshold value, and
• when the amount of demand electric power is greater than the total amount, the update is performed by reducing the control threshold value,
• wherein, when the amount of demand electric power is smaller than the total amount, the update is performed by dividing a value obtained by subtracting the amount of demand electric power from the total amount by a time from the time point of update to an end of the demand time period and adding the value obtained by division to the control threshold value.