Rotating electrical machine control device

A rotating electrical machine control device applied to a system including

• a power conversion circuit electrically connected to a rotating electrical machine, the power conversion circuit including at least one pair of upper arm and lower arm switches connected in series;
• and
• a capacitor electrically connected to an input side of the power conversion circuit, the rotating electrical machine control device comprising:
• a prediction unit that predicts, based on an operating area of the rotating electrical machine, at least a ripple current flowing through the capacitor for each temporarily set switching mode included in a plurality of switching modes, each of the plurality of switching modes defining an on/off operation pattern of the at least one pair of upper arm and lower arm switches;
• a determination unit that:
• performs, based on the operating area of the rotating electrical machine, a comparison between the ripple currents predicted for the respective temporarily set switching modes;
• and
• selects one of the temporarily set switching modes to according determine the selected one of the temporarily set a switching modes as a control switching mode for control of the inverter in accordance with a result of the comparison;
• and
• an operation unit that operates the power conversion circuit in accordance with the control switching mode determined by the determination unit,
• wherein a magnitude of the ripple current for each of the temporarily set switching modes is defined as a difference between a value of the capacitor current in a first period with at least one active voltage vector determined by the corresponding one of the temporarily set switching modes and a value of the capacitor current in a second period with at least one reactive voltage vector determined by the corresponding one of the temporarily set switching modes.