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Structure and method for performing active injection mode filtering on an AC power system

  • US 5,608,276 A
  • Filed: 06/07/1995
  • Issued: 03/04/1997
  • Est. Priority Date: 06/06/1994
  • Status: Expired due to Term
First Claim
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1. A method for injecting current onto an AC power line, wherein said power line is operated at a line voltage which exhibits a fundamental frequency component and non-fundamental frequency components, said method comprising the steps of:

  • sensing said line voltage on said power line;

    generating a first signal having a first component and a second component, wherein said first component is proportional to said line voltage and said second component is proportional to the rate of change of said line voltage;

    filtering a fundamental frequency component from said first signal, thereby producing a second signal proportional to the non-fundamental frequency components of said first signal;

    generating an electronic load current component in response to said second signal, wherein said electronic load current component is proportional to said second signal and opposite in phase to said second signal; and

    providing said electronic load current component to said power line, thereby loading the non-fundamental frequency components of said line voltage.

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