Power control apparatus, electrically powered vehicle and power control method of power system
First Claim
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1. A power control apparatus, comprising:
- a first poly-phase AC electric motor including a star-connected first poly-phase winding as a stator winding;
a second poly-phase AC electric motor including a star-connected second poly-phase winding as a stator winding;
an electric storage charged by regenerative power generated by at least one of said first and second poly-phase AC electric motors;
an electric load electrically connected between a first neutral point of said first poly-phase winding and a second neutral point of said second poly-phase winding; and
voltage control means for calculating surplus power corresponding to remainder obtained by subtracting power charged in said electric storage from said regenerative power, and for controlling a voltage across said first and second neutral points in accordance with the calculated surplus power.
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Abstract
When surplus power not charged to an electric storage is generated at the time of regenerative braking of a vehicle, a voltage is generated across first and second neutral points using a zero-voltage vector each of first and second inverters and the generated surplus power is consumed by a resistance connected across the first and second neutral points. The voltage generated across the first and second neutral points is calculated in accordance with the surplus voltage, using a resistance value of the resistance.
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Citations
20 Claims
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1. A power control apparatus, comprising:
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a first poly-phase AC electric motor including a star-connected first poly-phase winding as a stator winding;
a second poly-phase AC electric motor including a star-connected second poly-phase winding as a stator winding;
an electric storage charged by regenerative power generated by at least one of said first and second poly-phase AC electric motors;
an electric load electrically connected between a first neutral point of said first poly-phase winding and a second neutral point of said second poly-phase winding; and
voltage control means for calculating surplus power corresponding to remainder obtained by subtracting power charged in said electric storage from said regenerative power, and for controlling a voltage across said first and second neutral points in accordance with the calculated surplus power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrically powered vehicle, comprising:
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a first poly-phase AC electric motor including a star-connected first poly-phase winding as a stator winding;
a second poly-phase AC electric motor including a star-connected second poly-phase winding as a stator winding;
a driving wheel mechanically linked to a rotation shaft of said second poly-phase AC electric motor;
an electric storage charged by regenerative power generated by at least one of said first and second poly-phase AC electric motors;
an electric load electrically connected between a first neutral point of said first poly-phase winding and a second neutral point of said second poly-phase winding; and
voltage control means for calculating surplus power corresponding to remainder obtained by subtracting power charged in said electric storage from said regenerative power generated by said second poly-phase AC electric motor using kinetic energy of the vehicle at the time of a braking operation of the vehicle, and for controlling a voltage across said first and second neutral points in accordance with the calculated surplus power.
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9. A power control method for a power system, wherein
said power system includes a first poly-phase AC electric motor including a star-connected first poly-phase winding as a stator winding, a second poly-phase AC electric motor including a star-connected second poly-phase winding as a stator winding, an electric storage charged by regenerative power generated by at least one of said first and second poly-phase AC electric motors, an electric load electrically connected between a first neutral point of said first poly-phase winding and a second neutral point of said second poly-phase winding, and first and second inverters respectively connected to said first and second poly-phase windings, and generating a voltage difference in accordance with a command voltage value across said first and second neutral points; -
said power control method comprising;
a first step of calculating surplus power corresponding to remainder obtained by subtracting power charged in said electric storage from said regenerative power; and
a second step of calculating said command voltage value based on the calculated surplus voltage. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A power control apparatus, comprising:
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a first poly-phase AC electric motor including a star-connected first poly-phase winding as a stator winding;
a second poly-phase AC electric motor including a star-connected second poly-phase winding as a stator winding;
an electric storage charged by regenerative power generated by at least one of said first and second poly-phase AC electric motors;
an electric load electrically connected between a first neutral point of said first poly-phase winding and a second neutral point of said second poly-phase winding;
first and second inverters respectively connected to said first and second poly-phase windings; and
a controller executing a series of operations;
whereinsaid controller calculates surplus power corresponding to remainder obtained by subtracting power charged in said electric storage from said regenerative power;
generates a command voltage value for generating a voltage difference across said first and second neutral points based on the calculated surplus power; and
controls said first and second inverters such that a voltage difference in accordance with said command voltage value is generated across said first and second neutral points. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification