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Composite filter for suppressing harmonic frequencies on electric power transmission lines

  • US 4,224,660 A
  • Filed: 01/22/1979
  • Issued: 09/23/1980
  • Est. Priority Date: 01/22/1979
  • Status: Expired due to Term
First Claim
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1. A composite filter for suppressing harmonics produced by a converter in an AC to DC power line transmission system comprising first and second filter sections, said first section passing current having a given harmonic frequency and also passing current having harmonic frequencies thereabove which are multiples of the system frequency, means connecting said first and second sections in series between one line of the AC portion of said power system and a second line thereof, said serially connected first and second filter sections together being substantially series-resonant at said given harmonic frequency, and means connected to the junction of said first and second filter sections for injecting current into said filter sections at said junction which injected current is sufficient to cause substantially complete filtration at said given harmonic frequency.

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