Power conversion system and power conversion control method
First Claim
1. A power conversion system comprising:
- a first voltage source;
a second voltage source;
a multiple-phase alternating current motor;
a switch section configured to produce an output pulse based on first and second output voltages of the first and second voltage sources, respectively, to drive the multiple-phase alternating current motor; and
a control unit configured to control the switch section includinga torque computing section configured to compute a motor current command value and a motor voltage command value that satisfy a motor torque command value,an output voltage command value computing section configured to compute first and second output voltage command values for the first and second voltage sources, respectively, that satisfy the motor current command value, the motor voltage command value and a target charged power that is set based on conditions of the first and second voltage sources, anda PWM pulse generating section configured to generate a PWM pulse for driving the switch section based on the first and second output voltage command values,the output voltage command value computing section of the control unit being further configured to compute the first and second output voltage command values based on a first output voltage command vector and a second output voltage command vector when the first voltage source is to be charged and the second voltage source is to be discharged, the first output voltage command vector corresponding to the first output voltage command value of the first voltage source satisfying the target charged power, the second output voltage command vector corresponding to the second output voltage command value of the second voltage source, the first and second output voltage command vectors being determined so thata resultant vector of the first and second output voltage command vectors is coincident with a motor voltage command vector corresponding to the motor voltage command value, anda motor current command vector corresponding to the motor current command value is positioned within an included angle formed between the second output voltage command vector and a negative vector of the first output voltage command vector.
1 Assignment
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Accused Products
Abstract
A power conversion system includes first and second voltage sources for driving a multiple-phase AC motor and a control unit. The control unit is configured to compute first and second output voltage command values used to drive the multiple-phase AC motor based on a first output voltage command vector corresponding to the voltage source that is charged and a second output voltage command vector corresponding to the voltage source that is discharged. The first and second output voltage command vectors are determined so that a resultant vector of the first and second output voltage command vectors is coincident with a motor voltage command vector corresponding to a motor voltage command value, and a motor current command vector corresponding to the motor current command value is positioned within an included angle formed between the second output voltage command vector and a negative vector of the first output voltage command vector.
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Citations
13 Claims
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1. A power conversion system comprising:
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a first voltage source; a second voltage source; a multiple-phase alternating current motor; a switch section configured to produce an output pulse based on first and second output voltages of the first and second voltage sources, respectively, to drive the multiple-phase alternating current motor; and a control unit configured to control the switch section including a torque computing section configured to compute a motor current command value and a motor voltage command value that satisfy a motor torque command value, an output voltage command value computing section configured to compute first and second output voltage command values for the first and second voltage sources, respectively, that satisfy the motor current command value, the motor voltage command value and a target charged power that is set based on conditions of the first and second voltage sources, and a PWM pulse generating section configured to generate a PWM pulse for driving the switch section based on the first and second output voltage command values, the output voltage command value computing section of the control unit being further configured to compute the first and second output voltage command values based on a first output voltage command vector and a second output voltage command vector when the first voltage source is to be charged and the second voltage source is to be discharged, the first output voltage command vector corresponding to the first output voltage command value of the first voltage source satisfying the target charged power, the second output voltage command vector corresponding to the second output voltage command value of the second voltage source, the first and second output voltage command vectors being determined so that a resultant vector of the first and second output voltage command vectors is coincident with a motor voltage command vector corresponding to the motor voltage command value, and a motor current command vector corresponding to the motor current command value is positioned within an included angle formed between the second output voltage command vector and a negative vector of the first output voltage command vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power conversion system comprising:
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a first voltage source; a second voltage source; a multiple-phase alternating current motor; a switch section configured to produce an output pulse based on first and second output voltages of the first and second voltage sources, respectively, to drive the multiple-phase alternating current motor; and a control unit configured to control the switch section including a torque computing section configured to compute a motor current command value and a motor voltage command value that satisfy a motor torque command value, an output voltage command value computing section configured to compute first and second output voltage command values for the first and second voltage sources, respectively, that satisfy the motor current command value, the motor voltage command value and a target charged power that is set based on conditions of the first and second voltage sources, and a PWM pulse generating section configured to generate a PWM pulse for driving the switch section based on the first and second output voltage command values, the output voltage command value computing section of the control unit being further configured to compute the output voltage command values, when the first voltage source is to be charged and the second voltage source is to be discharged, such that an electric power calculated based on a motor current command waveform corresponding to the motor current command value and a first output voltage command waveform corresponding to the first voltage source satisfies the target charged power, and a resultant voltage waveform of the first output voltage command waveform corresponding to the first voltage source and a second output voltage command waveform corresponding to the second voltage source is coincident with a motor voltage command waveform corresponding to the motor voltage command value, and a location point of a positive peak of the motor current command waveform is positioned within time interval ranging from a location point of a negative peak of the first output voltage command waveform to a location point of a positive peak of the second output voltage command waveform existing within one period of the motor current command waveform. - View Dependent Claims (10, 11)
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12. A power conversion control method comprising:
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outputting a first output voltage by a first voltage source; outputting a second output voltage by a second voltage source; driving a multiple-phase alternating current motor by using at least one of the first and second output voltages by producing an output pulse based on the first and second output voltages of the first and second voltage sources, respectively; and controlling the output pulse for driving the multiple-phase alternating current motor by computing a motor current command value and a motor voltage command value that satisfy a motor torque command value, computing first and second output voltage command values for the first and second voltage sources, respectively, that satisfy the motor current command value, the motor voltage command value and a target charged power that is set based on conditions of the first and second voltage sources, and generating a PWM pulse for producing the output pulse based on the first and second output voltage command values, the computing of the first and second output voltage command values including computing the first and second output voltage command values based on a first output voltage command vector and a second output voltage command vector when the first voltage source is to be charged and the second voltage source is to be discharged, the first output voltage command vector corresponding to the first output voltage command value of the first voltage source satisfying the target charged power, the second output voltage command vector corresponding to the second output voltage command value of the second voltage source, the first and second output voltage command vectors being determined so that a resultant vector of the first and second output voltage command vectors is coincident with a motor voltage command vector corresponding to the motor voltage command value, and a motor current command vector corresponding to the motor current command value is positioned within an included angle formed between the second output voltage command vector and a negative vector of the first output voltage command vector.
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13. A power conversion control method comprising:
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outputting a first output voltage by a first voltage source; outputting a second output voltage by a second voltage source; driving a multiple-phase alternating current motor by using at least one of the first and second output voltages by producing an output pulse based on the first and second output voltages of the first and second voltage sources, respectively; and controlling the output pulse for driving the multiple-phase alternating current motor by computing a motor current command value and a motor voltage command value that satisfy a motor torque command value, computing first and second output voltage command values for the first and second voltage sources, respectively, that satisfy the motor current command value, the motor voltage command value and a target charged power that is set based on conditions of the first and second voltage sources, and generating a PWM pulse for producing the output pulse based on the first and second output voltage command values, the computing of the first and second output voltage command values including computing the output voltage command values, when the first voltage source is to be charged and the second voltage source is to be discharged, such that an electric power calculated based on a motor current command waveform corresponding to the motor current command value and a first output voltage command waveform corresponding to the first voltage source satisfies the target charged power, and a resultant voltage waveform of the first output voltage command waveform and a second output voltage command waveform corresponding to the second voltage source is coincident with a motor voltage command waveform corresponding to the motor voltage command value, and a location point of a positive peak of the motor current command waveform is positioned within time interval ranging from a location point of a negative peak of the first output voltage command waveform to a location point of a positive peak of the second output voltage command waveform existing within one period of the motor current command waveform.
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Specification