Control device of home energy management system

A control device of a home energy management system (HEMS), the control device comprising:

• a communication module configured to wiredly or wirelessly connect to a HEMS gateway;
• a storage configured to store power usage information for a predetermined period in a home in which the HEMS gateway is installed;
• and
• a controller configured to:
• predict a power consumption amount on the basis of the power usage information for the predetermined period,
• predict a power generation amount of a photovoltaic (PV) module connected to the HEMS gateway,
• calculate a PV power amount to be sold on the basis of the predicted power generation amount and power consumption amount,
• receive purchase information of purchasers from a control device of each of the purchasers or a power supply server,
• select at least one purchaser among the purchasers based on an amount of power to be purchased and price information included in the purchase information,
• set a sales price with respect to the calculated power amount on the basis of the purchase information of the selected at least one purchaser,
• control the HEMS so that a sale power corresponding to the calculated power amount is provided on the basis of the set sales price,
• receive information with respect to an actual power generation amount of the PV module from the HEMS gateway,
• determine that deficiency of the sale power occurs when the actual power generation amount is less than the predicted power generation amount,
• receive information on a remaining amount of a battery of an electric vehicle from the electric vehicle or an electric vehicle charger connected to the electric vehicle when the electric vehicle is connected to the electric vehicle charger,
• control the electric vehicle or the electric vehicle charger so that a power amount corresponding to the deficient power is provided from the battery of the electric vehicle when a sum of the actual power generation amount and the remaining amount of the battery is equal to or more than the predicted power generation amount, and
• when the power amount provided from the battery is less than the deficient power amount, perform purchasing a power amount corresponding to the deficient power amount from another user or a power facility to provide the purchased power as part of the sale power.