Electric power conversion apparatus having a controller that switches a control scheme of a main circuit

An electric power conversion apparatus comprising:

• a main circuit including a switching element, the main circuit to convert electric power input to the main circuit and supply a result of the conversion to a load;
• a detector to detect an output value of the main circuit;
• and
• a controller to control the main circuit, wherein
• the output value of the main circuit is an output voltage of the main circuit or an output current of the main circuit, and
• the controller switches a control scheme of the main circuit from a first control scheme to a second control scheme at a first time point when the output value starts to vary,
• the controller predicts, on the basis of a detection value of the detector, a prediction value of the output value of the main circuit,
• the controller switches the control scheme of the main circuit from the second control scheme to the first control scheme at a second time point when a determination is made, based on the prediction value of the output value of the main circuit, that switching of a variation direction of the output value will occur,
• the controller predicts, on the basis of the detection value, an output value of the main circuit at a timing after a detection time point of the detection value,
• the first control scheme is feedback control under which the output value is controlled to follow a command value, and
• the second control scheme is feedback control with correction under which a correction is applied to the feedback control in the first control scheme on the basis of a prediction value of the output value of the main circuit.