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Power conversion system and power conversion control method

  • US 7,710,065 B2
  • Filed: 10/23/2007
  • Issued: 05/04/2010
  • Est. Priority Date: 11/17/2006
  • Status: Active Grant
First Claim
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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.

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