CONTROL DEVICE, ELECTRICAL POWER SUPPLY SYSTEM, AIRCRAFT, CONTROL METHOD, AND STORAGE MEDIUM

A control device includes: a first control unit capable of controlling an electrical power conversion unit in a manner so that an electrical power is supplied from a generator to at least one of an electrical power storage device or a first load device; and a determination unit that determines a residual capacity of the electrical power storage device. In response to the determination unit determining that the residual capacity of the electrical power storage device becomes greater than or equal to a first threshold value, the first control unit can execute residual capacity reduction control for reducing the residual capacity of the electrical power storage device by controlling the electrical power conversion unit in a manner so that an electrical power is supplied from the electrical power storage device to the generator.