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INVERTER VECTOR DRIVING SYSTEM AND METHOD FOR ESTIMATING CAPACITANCE USING THE SAME

  • US 20160282392A1
  • Filed: 03/25/2016
  • Published: 09/29/2016
  • Est. Priority Date: 03/25/2015
  • Status: Active Grant
First Claim
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1. A method for estimating capacitance in an inverter vector driving system including a capacitor to which a rectified DC voltage of a three-phase power supply is charged and a PWM inverter configured to transform the DC voltage into a three-phase AC voltage to be applied to an induction motor (IM), comprising:

  • operating the motor in a regeneration mode;

    generating a d-axis voltage command using a d-axis current command of a d-q coordinate system for the motor and a d-axis DC current obtained from the motor, and generating a q-axis voltage command using a q-axis current command, a q-axis DC current obtained from the motor, a q-axis current command including a predetermined AC component, and a q-axis AC current obtained from the motor;

    adjusting a pulse of the PWM inverter by using the d-axis voltage command and the q-axis voltage command; and

    estimating capacitance of the capacitor by using a DC-link voltage and a DC-link current that are generated at the capacitor due to the inclusion of the AC component.

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