Ac voltage output apparatus and hybrid vehicle including the same
First Claim
1. An AC voltage output apparatus, comprising:
- a first polyphase AC motor including a star-connected first polyphase winding as a stator winding;
a second polyphase AC motor including a star-connected second polyphase winding as a stator winding;
first and second inverters connected to said first and second polyphase windings respectively; and
a control device controlling said first and second inverters such that an AC voltage having a prescribed frequency is generated across a neutral point of said first polyphase winding and a neutral point of said second polyphase winding when a rotor of said second polyphase AC motor is stopped;
whereinsaid control device includesa harmonic generation unit generating a harmonic voltage instruction having a phase opposite to a harmonic of counter-electromotive force generated at the neutral point of said first polyphase winding, based on number of revolutions of said first polyphase AC motor when a rotor of said first polyphase AC motor revolves, anda signal generation unit generating a control signal for controlling said first inverter based on a voltage instruction obtained by superposing said harmonic voltage instruction onto a voltage instruction of each phase of said first polyphase AC motor and outputting the generated control signal to said first inverter.
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Abstract
A first inverter control unit includes a harmonic generation unit. The harmonic generation unit generates a harmonic voltage instruction having a phase opposite to a harmonic generated at a neutral point of a motor-generator when the motor-generator revolves, based on motor revolution number of the motor-generator. A PWM signal generation unit generates a signal based on a voltage instruction obtained by superimposing an AC voltage instruction from an AC output control unit and the harmonic voltage instruction from the harmonic generation unit onto each voltage instruction of U-phase, V-phase and W-phase from a conversion unit.
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Citations
17 Claims
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1. An AC voltage output apparatus, comprising:
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a first polyphase AC motor including a star-connected first polyphase winding as a stator winding; a second polyphase AC motor including a star-connected second polyphase winding as a stator winding; first and second inverters connected to said first and second polyphase windings respectively; and a control device controlling said first and second inverters such that an AC voltage having a prescribed frequency is generated across a neutral point of said first polyphase winding and a neutral point of said second polyphase winding when a rotor of said second polyphase AC motor is stopped;
whereinsaid control device includes a harmonic generation unit generating a harmonic voltage instruction having a phase opposite to a harmonic of counter-electromotive force generated at the neutral point of said first polyphase winding, based on number of revolutions of said first polyphase AC motor when a rotor of said first polyphase AC motor revolves, and a signal generation unit generating a control signal for controlling said first inverter based on a voltage instruction obtained by superposing said harmonic voltage instruction onto a voltage instruction of each phase of said first polyphase AC motor and outputting the generated control signal to said first inverter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 17)
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8. An AC voltage output apparatus, comprising:
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a first polyphase AC motor including a star-connected first polyphase winding as a stator winding; a second polyphase AC motor including a star-connected second polyphase winding as a stator winding; first and second inverters connected to said first and second polyphase windings respectively; and a control device controlling said first and second inverters such that an AC voltage having a prescribed frequency is generated across a neutral point of said first polyphase winding and a neutral point of said second polyphase winding;
whereinsaid control device includes a first harmonic generation unit generating a first harmonic voltage instruction having a phase opposite to a harmonic of counter-electromotive force generated at the neutral point of said first polyphase winding, based on number of revolutions of said first polyphase AC motor when a rotor of said first polyphase AC motor revolves, a first signal generation unit generating a control signal for controlling said first inverter based on a voltage instruction obtained by superposing said first harmonic voltage instruction onto a voltage instruction of each phase of said first polyphase AC motor and outputting the generated control signal to said first inverter, a second harmonic generation unit generating a second harmonic voltage instruction having a phase opposite to a harmonic of counter-electromotive force generated at the neutral point of said second polyphase winding, based on number of revolutions of said second polyphase AC motor when a rotor of said second polyphase AC motor revolves, and a second signal generation unit generating a control signal for controlling said second inverter based on a voltage instruction obtained by superposing said second harmonic voltage instruction onto a voltage instruction of each phase of said second polyphase AC motor and outputting the generated control signal to said second inverter.
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9. An AC voltage output apparatus, comprising:
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a first polyphase AC motor including a star-connected first polyphase winding as a stator winding; a second polyphase AC motor including a star-connected second polyphase winding as a stator winding; first and second inverters connected to said first and second polyphase windings respectively; and control means for controlling said first and second inverters such that an AC voltage having a prescribed frequency is generated across a neutral point of said first polyphase winding and a neutral point of said second polyphase winding when a rotor of said second polyphase AC motor is stopped;
whereinsaid control means includes harmonic generation means for generating a harmonic voltage instruction having a phase opposite to a harmonic of counter-electromotive force generated at the neutral point of said first polyphase winding, based on number of revolutions of said first polyphase AC motor when a rotor of said first polyphase AC motor revolves, and signal generation means for generating a control signal for controlling said first inverter based on a voltage instruction obtained by superposing said harmonic voltage instruction onto a voltage instruction of each phase of said first polyphase AC motor and outputting the generated control signal to said first inverter. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An AC voltage output apparatus, comprising:
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a first polyphase AC motor including a star-connected first polyphase winding as a stator winding; a second polyphase AC motor including a star-connected second polyphase winding as a stator winding; first and second inverters connected to said first and second polyphase windings respectively; and control means for controlling said first and second inverters such that an AC voltage having a prescribed frequency is generated across a neutral point of said first polyphase winding and a neutral point of said second polyphase winding;
whereinsaid control means includes first harmonic generation means for generating a first harmonic voltage instruction having a phase opposite to a harmonic of counter-electromotive force generated at the neutral point of said first polyphase winding, based on number of revolutions of said first polyphase AC motor when a rotor of said first polyphase AC motor revolves, first signal generation means for generating a control signal for controlling said first inverter based on a voltage instruction obtained by superposing said first harmonic voltage instruction onto a voltage instruction of each phase of said first polyphase AC motor and outputting the generated control signal to said first inverter, second harmonic generation means for generating a second harmonic voltage instruction having a phase opposite to a harmonic of counter-electromotive force generated at the neutral point of said second polyphase winding, based on number of revolutions of said second polyphase AC motor when a rotor of said second polyphase AC motor revolves, and second signal generation means for generating a control signal for controlling said second inverter based on a voltage instruction obtained by superposing said second harmonic voltage instruction onto a voltage instruction of each phase of said second polyphase AC motor and outputting the generated control signal to said second inverter.
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Specification