CONTROL DEVICE, POWER CONVERSION SYSTEM, POWER SUPPLY DEVICE, COMPUTER-READABLE STORAGE MEDIUM, AND CONTROL METHOD

A control apparatus for controlling output power, which is power outputted by a power supply apparatus to a power grid, includes an output control unit which causes the power supply apparatus to operate in any one mode of (i) a first mode in which magnitude of the output power is increased such that an absolute value of a fluctuation rate indicating a ratio of a fluctuation amount of the output power per unit time to a rated output of the power supply apparatus is equal to or smaller than a first threshold value or smaller than the first threshold value, (ii) a second mode in which the magnitude of the output power is decreased such that the absolute value of the fluctuation rate is equal to or smaller than a second threshold value or smaller than the second threshold value, and (iii) a third mode in which the magnitude of the output power is maintained such that the absolute value of the fluctuation rate is equal to or smaller than a third threshold value or smaller than the third threshold value.