A power conversion apparatus is provided in a rotary electric machine, converting a power between a DC power source and the rotary electric machine having a multiphase winding. The power conversion apparatus includes: a plurality of switching modules each having a switching element for performing switching to control a current direction of a current flowing from the DC power source to the winding; a plurality of capacitor modules each having a capacitor that suppresses high frequency oscillation occurring on the current due to the switching operation; a positive side conductor connected to a positive electrode of the DC power source; and a negative side conductor connected to a negative electrode of the DC power source.

A power conversion apparatus is provided in a rotary electric machine, converting a power between a DC power source and the rotary electric machine having a multiphase winding. The power conversion apparatus includes: a plurality of switching modules each having a switching element for performing switching to control a current direction of a current flowing from the DC power source to the winding; a plurality of capacitor modules each having a capacitor that suppresses high frequency oscillation occurring on the current due to the switching operation; a positive side conductor connected to a positive electrode of the DC power source; and a negative side conductor connected to a negative electrode of the DC power source.

When a voltage application command is outputted to a three-phase winding of one system, a d-axis proportionality constant and a q-axis proportionality constant are set with Ld and Lq, respectively, as parameters; when voltage application commands are outputted to three-phase windings of two systems, a d-axis proportionality constant and a q-axis proportionality constant are set with [Ld+Md] and [Lq+Mq], respectively, as parameters.

When a voltage application command is outputted to a three-phase winding of one system, a d-axis proportionality constant and a q-axis proportionality constant are set with Ld and Lq, respectively, as parameters; when voltage application commands are outputted to three-phase windings of two systems, a d-axis proportionality constant and a q-axis proportionality constant are set with [Ld+Md] and [Lq+Mq], respectively, as parameters.

A power conversion system including a first converter configured to convert an input voltage into a plurality of discrete voltages. A second converter configured to convert the plurality of discrete voltages into a plurality of modulated voltages. Each modulated voltage of the plurality of modulated voltages comprises two voltage levels equal, respectively, to two of the discrete voltages of the plurality of discrete voltages. A selection unit configured to alternatively output each modulated voltage of the plurality of modulated voltages across a pair of output terminals.

A power conversion system including a first converter configured to convert an input voltage into a plurality of discrete voltages. A second converter configured to convert the plurality of discrete voltages into a plurality of modulated voltages. Each modulated voltage of the plurality of modulated voltages comprises two voltage levels equal, respectively, to two of the discrete voltages of the plurality of discrete voltages. A selection unit configured to alternatively output each modulated voltage of the plurality of modulated voltages across a pair of output terminals.

A power conversion system including a first converter configured to convert an input voltage into a plurality of discrete voltages. A second converter configured to convert the plurality of discrete voltages into a plurality of modulated voltages. Each modulated voltage of the plurality of modulated voltages comprises two voltage levels equal, respectively, to two of the discrete voltages of the plurality of discrete voltages. A selection unit configured to alternatively output each modulated voltage of the plurality of modulated voltages across a pair of output terminals.

A power conversion system including a first converter configured to convert an input voltage into a plurality of discrete voltages. A second converter configured to convert the plurality of discrete voltages into a plurality of modulated voltages. Each modulated voltage of the plurality of modulated voltages comprises two voltage levels equal, respectively, to two of the discrete voltages of the plurality of discrete voltages. A selection unit configured to alternatively output each modulated voltage of the plurality of modulated voltages across a pair of output terminals.

A power conversion apparatus is provided in a rotary electric machine, converting a power between a DC power source and the rotary electric machine having a multiphase winding. The power conversion apparatus includes: a plurality of switching modules each having a switching element for performing switching to control a current direction of a current flowing from the DC power source to the winding; a plurality of capacitor modules each having a capacitor that suppresses high frequency oscillation occurring on the current due to the switching operation; a positive side conductor connected to a positive electrode of the DC power source; and a negative side conductor connected to a negative electrode of the DC power source.

A power conversion apparatus is provided in a rotary electric machine, converting a power between a DC power source and the rotary electric machine having a multiphase winding. The power conversion apparatus includes: a plurality of switching modules each having a switching element for performing switching to control a current direction of a current flowing from the DC power source to the winding; a plurality of capacitor modules each having a capacitor that suppresses high frequency oscillation occurring on the current due to the switching operation; a positive side conductor connected to a positive electrode of the DC power source; and a negative side conductor connected to a negative electrode of the DC power source.