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Apparatus and method for controlling asymmetric modular multilevel converter

  • US 10,044,294 B2
  • Filed: 12/02/2016
  • Issued: 08/07/2018
  • Est. Priority Date: 12/03/2015
  • Status: Active Grant
First Claim
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1. An apparatus for controlling an asymmetric modular multilevel converter, comprising:

  • an asymmetric arm connected between a positive (+) input terminal and a negative (−

    ) input terminal of a DC bus voltage (VDC) and includingN modules of full bridge converter, andK modules of half bridge converter, wherein said N and K are constant number, respectively; and

    a control method controlling each capacitor voltage of the N modules of full bridge converter and each capacitor voltage of the K modules of half bridge converter to be different from one another,wherein each module configuring the asymmetric arm uses a different voltage and an output voltage is expressed by a combination thereof,each of the K modules of half bridge converter is responsible for an equally divided voltage, anda sum of capacitor voltages of the K modules of half bridge converter is always equal to the DC bus voltage (VDC) when the asymmetric modular multilevel converter (AMMC) is in a normal state.

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