Power management device

A power management device comprising:

• a processor configured to function to manage an exchange of electric power in a power system including a virtual power plant, wherein
• when it is determined that an abnormality has occurred in the power system, and it is determined that either a charge control function or a power generation control function in the virtual power plant can be continued based on a type of the abnormality:
• in a case where a cause of the abnormality is a voltage abnormality, the processor causes the virtual power plant to perform the exchange of the electric power in only one direction that suppresses a power abnormality,
• in a case where the cause of the abnormality is a frequency abnormality, the processor causes the virtual power plant to perform the exchange of the electric power within a range in which an output fluctuation is equal to or less than a predetermined value, and
• when it is determined that the abnormality has occurred in the power system, and it is determined that either the charge control function or the power generation control function in the virtual power plant cannot be continued based on the type of the abnormality, in a case where the cause of the abnormality is a disconnection failure or a short-circuit failure, the processor prohibits the exchange of the electric power by the virtual power plant until failure recovery, wherein the processor is further configured to resume the exchange of electric power upon restoring of the power system.