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Feedforward control of motor drives with output sinewave filter

  • US 10,158,314 B2
  • Filed: 02/01/2017
  • Issued: 12/18/2018
  • Est. Priority Date: 01/16/2013
  • Status: Active Grant
First Claim
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1. A power conversion system, comprising:

  • an inverter comprising a DC input, an AC output, and a plurality of switching devices coupled between the DC input and the AC output and operative according to inverter switching control signals to convert DC electrical power received at the DC input to provide AC electrical output power at the AC output to drive a motor load through an intervening output filter, a transformer and a cable; and

    a controller, including;

    a current regulator component implemented by a processor to compute a command value according to a current reference value and a motor current feedback value,a cross-coupled feedforward component implemented by the processor to compensate the command value by an estimated cross-coupled voltage value to compute a control output value, anda cross-coupled object component implemented by the processor to compute the motor current feedback value according to a voltage value using a plant transfer function representing the output filter, the transformer, the cable and the motor load;

    the controller being operative to provide the inverter switching control signals to control the inverter according to the control output value;

    wherein the current regulator component computes a d-axis command value according to a d-axis current reference value and a d-axis motor current feedback value, and computes a q-axis command value according to a q-axis current reference value and a q-axis motor current feedback value; and

    wherein the cross-coupled feedforward component compensates the d-axis command value by subtracting an estimated q-axis voltage value from the d-axis command value to compute a d-axis control output value, and wherein the cross-coupled feedforward component compensates the q-axis command value by adding an estimated d-axis voltage value to the q-axis command value to compute a q-axis control output value.

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