Management method, management device, distributed power supply, and management system

A management method comprising:

• receiving from a management device, by a distributed power supply which operates in a first state in which a reverse power flow from a facility to a power grid is not permitted, a permission message permitting the distributed power supply to operate in a second state in which the reverse power flow is permitted;
• switching, by the distributed power supply, the operation of the first state to the operation of the second state after receiving the permission message;
• and
• switching, by the distributed power supply, the operation of the second state to the operation of the first state, even when switching from the operation of the second state to the operation of the first state is not instructed, when a predetermined condition is satisfied.

A distributed power supply which operates in a first state in which a reverse power flow from a facility to a power grid is not permitted, the distributed power supply comprising:

• a receiver configured to receive a permission message permitting operation in a second state in which the reverse power flow is permitted;
• and
• a controller configured to switch the operation of the first state to the operation of the second state after receiving the permission message, and
• to switch the operation of the second state to the operation of the first state, even when switching from the operation of the second state to the operation of the first state is not instructed, when a predetermined condition is satisfied.

A management system comprising:

• a distributed power supply operating in a first state in which a reverse power flow from a facility to a power grid is not permitted,
• and a management device configured to transmit to the distributed power supply a permission message permitting to operate in a second state in which the reverse power flow is permitted,
• wherein the distributed power supply is configured
• to switch the operation of the first state to the operation of the second state after receiving the permission message, and
• to switch the operation of the second state to the operation of the first state, even when switching from the operation of the second state to the operation of the first state is not instructed, when a predetermined condition is satisfied.