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POWER CONVERSION SYSTEM

  • US 20160329831A1
  • Filed: 12/03/2014
  • Published: 11/10/2016
  • Est. Priority Date: 01/09/2014
  • Status: Active Grant
First Claim
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1. A power conversion system comprising:

  • a power converter for performing power conversion between plural-phase AC and DC, the power converter including a plurality of legs each having a positive arm and a negative arm connected in series, with a connection point therebetween connected to each phase AC line, the plurality of legs being connected in parallel between positive and negative DC buses; and

    a control device for controlling the power converter, whereineach of the positive arm and the negative arm of each leg is composed of at least one converter cells connected in series and including;

    a series unit of a plurality of semiconductor switching elements connected in series to each other; and

    a DC capacitor connected in parallel to the series unit, a terminal of the semiconductor switching element being used as an output terminal,the control device includes a voltage command generating unit for generating a first voltage command for the positive arm and a second voltage command for the negative arm, to perform output control for each converter cell in the positive arm and the negative arm, andthe voltage command generating unit includes;

    a current control unit for calculating control commands for controlling an AC current component flowing through each phase AC line, and a circulating current component for each phase which circulates between the legs; and

    a command distributing unit for, on the basis of the control commands and a DC voltage command value for voltage between the DC buses, subtracting voltage drop portions due to inductance values in the positive arm and the negative arm from voltages assigned as outputs of the positive arm and the negative arm, to determine the first voltage command and the second voltage command.

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