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Voltage fluctuation and higher harmonics suppressor

  • US 5,077,517 A
  • Filed: 12/05/1990
  • Issued: 12/31/1991
  • Est. Priority Date: 12/08/1989
  • Status: Expired due to Term
First Claim
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1. A device for suppressing voltage fluctuation and higher harmonics of a power system which supplies power to a load with large power fluctuation and higher harmonic current, said device comprising:

  • a self-commutated converter provided in parallel with said load;

    a higher harmonic filter provided in parallel with said load;

    first calculation means connected to receive a load current flowing through said load and a system voltage of said power system for calculating a reactive power consumed by said load based on said load current and said system voltage and for generating a fundamental harmonic current command value to compensate said reactive power;

    second calculation means connected to receive a current flowing from said power system for detecting a higher harmonic current flowing out to said power system and for generating a higher harmonic current command value to suppress said higher harmonic current;

    adder means connected to said first and second calculation means for adding said fundamental harmonic current command value and said higher harmonic current command value to generate a current command value of said self-commutated convertion; and

    control means connected to receive said current command value for controlling said self-commutate converter based on said current command value;

    thereby suppressing said voltage fluctuation and higher harmonics of said power system.

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