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VOLTAGE SOURCE CONVERTER AND CONTROL THEREOF

  • US 20170099007A1
  • Filed: 03/23/2015
  • Published: 04/06/2017
  • Est. Priority Date: 03/25/2014
  • Status: Active Grant
First Claim
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1. A voltage source converter comprising:

  • a plurality of phase limbs connected between high and low DC terminals;

    wherein each phase limb comprises;

    a high side director switch connecting the high DC terminal to an AC node for that phase limb;

    a low side director switch connecting the AC node to the low DC terminal; and

    a chain-link circuit, a first end of the chain-link circuit being connected between the high side and low side director switches to be electrically coupled to the AC node;

    first and second additional chain-link circuits, wherein first ends of the first and second additional chain-link circuits are connected to the high side DC terminal and low side DC terminals respectively; and

    a converter controller configured to control the director switches of each phase limb in a power cycle and to control the chain-link circuits of each phase limb in a voltage mode to provide a controlled voltage transition at the AC node during the power cycle, wherein said converter controller is operable to control at least some of said chain-link circuits in a current mode to provide a defined current at times during the power cycle;

    wherein each chain-link circuit comprises a plurality of series-connected chain-link modules, each of the chain-link modules comprising at least one energy storage element that can be selectively connected in series with the other modules or bypassed; and

    wherein a second end of each of the chain-link circuits is connected to a common node such that, in use, a current can flow from one phase limb to another via the respective chain-link circuits.

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