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DC-LINK VOLTAGE BALANCING SYSTEM AND METHOD FOR MULTILEVEL CONVERTERS

  • US 20110141786A1
  • Filed: 09/29/2010
  • Published: 06/16/2011
  • Est. Priority Date: 09/29/2010
  • Status: Active Grant
First Claim
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1. A control system for controlling a multilevel converter, the control system comprising:

  • a differential mode current regulator for generating reference voltage command signals based on a difference between reference current command signals and actual current command signals;

    a neutral point (NP) controller for determining a modified neutral point current signal in response to a DC link voltage unbalance and using the modified neutral point current signal to generate a common mode reference voltage signal; and

    a PWM controller for generating switching pulses for the multilevel converter based on the reference voltage command signals and the common mode reference voltage signal.

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