Energy management device, energy management system, and energy management method

An energy management system comprising:

• an energy management device provided at a customer and capable of controlling electric appliances of the customer by communicating with a server, the server being configured to send a request for demand response;
• and
• a power storage device provided, at the customer, as one of the electric appliances, the power storage device having a function of transmitting information indicating a power storage state of the power storage device to provide the information to the energy management device, wherein
• the energy management device includes:
• a receiver configured to receive the request for the demand response from the server,
• a transmitter configured to transmit a response indicating participation or nonparticipation with respect to the request,
• an electric appliance control unit configured to control each electric appliance, and
• an information acquisition unit configured to acquire information of the electric appliance, and
• after the response indicating participation has been transmitted, the information indicating the power storage state of the power storage device is acquired, and when determination that the request for the demand response is not achievable has been made on the basis of the acquired information, a response indicating nonparticipation is transmitted.

An energy management system comprising:

• a server configured to send a request for demand response;
• and
• an energy management device provided at a customer and capable of controlling an electric appliance of the customer by communicating with the server, wherein
• the energy management device includes:
• a receiver configured to receive the request for the demand response from the server,
• a transmitter configured to transmit a response indicating participation or nonparticipation with respect to the request,
• an electric appliance control unit configured to control the electric appliance, and
• an information acquisition unit configured to acquire information of the electric appliance, and
• after the response indicating participation has been transmitted, the information of the electric appliance is acquired, and when determination that the request for the demand response is not achievable has been made on the basis of the acquired information, a response indicating nonparticipation is transmitted.

An energy management method to be performed between a server configured to send a request for demand response, and an energy management device provided at a customer and capable of controlling an electric appliance of the customer by communicating with the server, the energy management method comprising:

• transmitting, by the server, the request for the demand response to the energy management device;
• transmitting, by the energy management device, a response indicating participation, when demand response is possible at a time point of reception of the request;
• acquiring, by the energy management device, information of the electric appliance after the response indicating participation has been transmitted, and transmitting, by the energy management device, a response indicating nonparticipation when, on the basis of the acquired information, the energy management device has determined that the request for the demand response is not achievable;
• and
• transmitting, by the server, a request for demand response to an energy management device of another customer when the server has received the response indicating nonparticipation.