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ADAPTIVE HARMONIC REDUCTION APPARATUS AND METHODS

  • US 20130033907A1
  • Filed: 10/10/2012
  • Published: 02/07/2013
  • Est. Priority Date: 09/30/2010
  • Status: Active Grant
First Claim
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1. A power conversion system, comprising:

  • an active rectifier including an AC input circuit with a rectifier input filter, a DC output with first and second DC output nodes, and a plurality of rectifier switching devices coupled between the AC input circuit and the DC output, the rectifier switching devices individually operative according to a corresponding rectifier switching control signal to selectively couple a corresponding AC input node with a corresponding DC output node;

    a DC circuit including first and second DC current paths coupled with the first and second DC output nodes of the rectifier;

    a PWM controller operative to provide pulse width modulated rectifier switching control signals to the rectifier to cause the rectifier to convert AC electrical input power to provide DC power to the DC circuit according to a set of rectifier switching angles; and

    a switching angle generator operative to provide the set of rectifier switching angles to the PWM controller, the switching angle generator being operative in a first mode to provide the set of rectifier switching angles to the PWM controller as a set of selective harmonic elimination rectifier switching angles defining a quarter-wave symmetrical selective harmonic elimination switching pattern, the switching angle generator being operative in a second mode to provide the set of rectifier switching angles to the PWM controller as a set of adaptive harmonic mitigation rectifier switching angles defining a half-wave symmetrical adaptive harmonic mitigation switching pattern based at least partially on source harmonics associated with AC input power received by the rectifier and load harmonics associated with a load driven by the power conversion system, wherein the adaptive harmonic mitigation switching pattern does not have quarter-wave symmetry.

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