Power conversion apparatus

A power conversion apparatus comprising:

• a multi-phase rotating electric machine that has a winding;
• a multi-phase inverter that has a series-connection body of an upper arm switch and a lower arm switch;
• and
• a capacitor that is connected in parallel to the series-connection body, wherein
• the power conversion apparatus includes
• a connection path that, in a first storage battery and a second storage battery that are connected in series, electrically connects the winding with both a negative-electrode side of the first storage battery and a positive-electrode side of the second storage battery, and
• a control unit that controls switching of the upper arm switch and the lower arm switch such that a current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path, wherein
• the control unit sets the command value such that, in a single cycle of a command value of a current that flows to the connection path, an area of a region that is prescribed by the command value that is positive and an area of a region that is prescribed by the command value that is negative are equal, and controls switching to control the current that flows to the connection path to the command value.

A power conversion apparatus comprising:

• a multi-phase rotating electric machine that has a winding;
• a multi-phase inverter that has a series-connection body of an upper arm switch and a lower arm switch;
• and
• a capacitor that is connected in parallel to the series-connection body, wherein
• in each phase, a connection point of the upper arm switch and the lower arm switch configuring the series-connection body;
• the power conversion apparatus includes
• a connection path that, in a first storage battery and a second storage battery that are connected in series, electrically connects a negative-electrode side of the first storage battery and a positive-electrode side of the second storage battery, with a connection point of the upper arm switch and the lower arm switch that configure the series-connection body of a portion of a plurality of phases,
• a control unit that controls switching of the upper arm switch and the lower arm switch such that a current flows between the first storage battery and the second storage battery through the inverter, the winding, and the connection path, and
• a connection switch that is provided on the connection path, and electrically connects the negative-electrode side of the first storage battery and the positive-electrode side of the second storage battery in response to the connection switch being set to be in an on-state, and electrically interrupts connection between the negative-electrode side of the first storage battery and the positive electrode-side of the second storage battery in response to the connection switch being set to be in an off-state;
• a phase of the plurality of phases in which the connection path is not connected is two phases or more;
• and
• when a current flows between the first storage battery and the second storage battery through the connection path, the control unit
• sets the connection switch to be in the on-state,
• controls the upper arm switch and the lower arm switch of a phase of the plurality of phases, in which the connection path is connected to the connection point, to be in an off-state, and
• controls switching of the upper arm switch and the lower arm switch of at least two phases of the plurality of phases in which the connection path is not connected to the connection point.