Control device for power generation device

A control device for a power generation device including a generator that converts rotational energy of a rotating body configured of a windmill or a waterwheel into electric energy, the control device comprising:

• a power converter configured to convert an output power of the generator into a power to be supplied to a power supply target;
• a storage that stores a reference map defining a reference operating point of the power generation device for each flow rate of a fluid giving the rotational energy to the rotating body;
• and
• a controller configured to control the power converter to operate the power generation device at the reference operating point, wherein
• the controller is configured to execute correction control in which for each of the flow rate of the fluid, (i) a search for an operating point of the power generation device at which the output power of the power converter is maximized is started from the reference operating point corresponding to the flow rate, and (ii) the reference operating point corresponding to the flow rate is corrected based on a result of the search for the operating point.