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POWER CONVERSION DEVICE AND CONTROL METHOD FOR SAME

  • US 20190044428A1
  • Filed: 08/19/2016
  • Published: 02/07/2019
  • Est. Priority Date: 10/07/2015
  • Status: Active Grant
First Claim
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1. A power conversion device provided between an AC grid and a DC power supply which outputs a voltage lower than a peak value of an absolute value of an AC voltage of the AC grid, the power conversion device being configured to perform DC/AC power conversion, the power conversion device comprising:

  • a filter circuit connected to the AC grid;

    a DC/DC converter provided between the DC power supply and a DC bus;

    a capacitor connected to the DC bus;

    a DC/AC converter provided between the DC bus and the filter circuit; and

    a control unit configured to control the DC/DC converter and the DC/AC converter, whereinthe control unitcalculates an output current target value on the basis of an input power value of a DC power and a voltage value of the AC grid, and calculates a current target value and a voltage target value for the DC/AC converter on the basis of the output current target value, to control the DC/AC converter, andcalculates a current target value for the DC/DC converter on the basis of the current target value and the voltage target value for the DC/AC converter and a voltage target value for the DC/DC converter, to control the DC/DC converter, thereby controlling output of an AC power, andthe control unit selects, as the voltage target value for the DC/DC converter, a greatest value at a present time, from among a DC voltage value of the DC power supply, an absolute value of a voltage target value for an AC side of the DC/AC converter, and a DC voltage lower limit value which is a predetermined value smaller than a peak value of the absolute value.

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