Communication method between electric vehicle, supply equipment, and power grid operation server

1. A method of communicating between an electric vehicle, a supply equipment, and a power grid operation server that monitors a power grid, the method comprising:

transmitting, by an electric vehicle communication controller of the electric vehicle, a discharge schedule comprising an amount of energy discharge, a discharge start time, and a discharge finish time to a supply equipment communication controller of the supply equipment or a power grid communication controller of the power grid operation server;

receiving a discharge cost calculated according to the discharge schedule from the supply equipment communication controller or the power grid communication controller; and

initiating a discharge process of the electric vehicle to the supply equipment or the power grid according to the discharge schedule,

wherein the discharge cost comprises an additional calculation cost, in response to a sum of the amount of energy discharge of the electric vehicle and an amount of energy discharge of another electric vehicle being greater than or equal to a reference energy discharge amount.

2. The method of claim 1 , further comprising setting up the discharge schedule in the electric vehicle prior to the transmitting of the discharge schedule,

wherein the setting up of the discharge schedule comprises setting a discharge start time and a discharge finish time on the basis of battery capacity information, battery voltage information, and state-of-charge information.

3. The method of claim 1 , wherein the transmitting of the discharge schedule comprises transmitting a message for calculation of the discharge cost, to the supply equipment communication controller of the supply equipment or the power grid communication controller of the power grid operation server on the basis of the sum of the amount of energy discharge of the electric vehicle and the amount of energy discharge of the another electric vehicle.

4. The method of claim 1 , wherein the additional calculation cost is varied based on the sum of the amount of energy discharge of the electric vehicle and the amount of energy discharge of the another electric vehicle.

5. The method of claim 1 , further comprising:

transmitting an authorization message for the discharge cost to the supply equipment communication controller or the power grid communication controller using the electric vehicle communication controller; and

transmitting a message, indicating that the discharge process is forcibly stopped, in response to the discharge process being stopped prior to the discharge finish time by an user of the vehicle, to the supply equipment communication controller or the power grid communication controller using the electric vehicle communication controller.

6. The method of claim 5 , further comprising:

receiving, from the supply equipment communication controller or the power grid communication controller, a message indicating a return cost of a difference between a discharge cost calculated based on the discharge finish time and a discharge cost calculated when the discharge is forcibly stopped, in response to the discharge process being forcibly stopped.

7. A method of communicating between an electric vehicle, a supply equipment, and a power grid operation server that monitors a power grid, the method comprising:

transmitting, by a supply equipment communication controller embedded in the supply equipment, a discharge cost based on a discharge schedule of the electric vehicle to an electric vehicle communication controller embedded in the electric vehicle;

transmitting a message related to an authorization request for the discharge cost to the electric vehicle communication controller using the supply equipment communication controller;

initiating a discharge process of the electric vehicle to the supply equipment or the power grid according to the discharge schedule according to the discharge schedule responsive to receiving, at the supply equipment communication controller, an authorization message for the discharge cost from the electric vehicle communication controller,

wherein the discharge cost comprises an additional calculation cost, in response to a sum of the amount of energy discharge of the electric vehicle and an amount of energy discharge of another electric vehicle being greater than or equal to a reference energy discharge amount.

8. The method of claim 7 , further comprising setting up the discharge schedule in the supply equipment prior to the transmitting of the discharge cost based on the discharge schedule,

wherein the setting up of the discharge schedule is based on battery capacity information, battery voltage information, and state-of-charge information received from the electric vehicle communication controller and a sales tariff table received from a power grid communication controller of the power grid operation server.

9. The method of claim 7 , further comprising setting up the discharge schedule in the supply equipment prior to the transmitting of the discharge cost,

wherein the discharge schedule comprises the amount of energy discharge, a discharge start time, and a discharge finish time.

10. The method of claim 9 , further comprising, after the receiving of the authorization message for the discharge cost, transmitting, to the supply equipment communication controller and a power grid communication controller of the power grid operation server, a message indicating that the discharge process is forcibly stopped by an operator of the supply equipment.

11. The method of claim 10 , further comprising:

transmitting, from the electric vehicle communication controller or the power grid communication controller, a message indicating a return cost of a difference between a discharge cost calculated based on the discharge finish time and a cost calculated based on a finish time when the discharge is forcibly stopped, in response to the discharge process being forcibly stopped.

12. The method of claim 7 , further comprising:

calculating an amount of carbon dioxide reduction on the basis of the amount of energy consumption of an off-board charger of the supply equipment using the supply equipment communication controller; and

transmitting information related to the amount of carbon dioxide reduction to the electric vehicle communication controller and the power grid communication controller.