COMMUNICATION METHOD BETWEEN ELECTRIC VEHICLE, SUPPLY EQUIPMENT AND POWER GRID OPERATION SERVER

Disclosed is a method of communicating between an electric vehicle, a supply equipment, and a power grid, which is performed by an electric vehicle communication controller of the electric vehicle, the method including operations of transmitting a message related to the charge schedule including a mileage input by a vehicle user through a human-machine interface and the amount of energy charge calculated according to the mileage to a supply equipment communication controller of the supply equipment and to a power grid communication controller of a power grid operation server via the supply equipment communication controller, receiving a message related to a charge cost calculated according to the charge schedule as a charge cost to be paid to the supply equipment from the supply equipment communication controller, transmitting an authorization message for the charge cost to the supply equipment communication controller, and exchanging a message indicating that charging is ready with the supply equipment communication controller in order to start charging the electric vehicle.