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Apparatus and method for estimating synchronized phasors at predetermined times referenced to an absolute time standard in an electrical system

  • US 7,480,580 B2
  • Filed: 08/15/2006
  • Issued: 01/20/2009
  • Est. Priority Date: 10/18/2005
  • Status: Active Grant
First Claim
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1. An apparatus for estimating a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system, the apparatus comprising:

  • a sample controller configured to determine a frequency of a power system signal acquired at a location of the electrical power system;

    a sampling means configured to sample the electrical power system signal at a sampling interval rate based on the frequency of the power system signal to form a plurality of signal samples;

    a time controller configured to generate a plurality of acquisition time values based on an occurrence of each of the plurality signal samples at a corresponding plurality of sample times referenced to the absolute time standard, each of the plurality of acquisition time values associated with a phasor magnitude and a phasor phase angle of each of the plurality of signal samples; and

    a phasor estimator configured to adjust the phasor magnitude and the phasor phase angle for each of the plurality of signal samples based on a time difference between a corresponding selected acquisition time value of the plurality of acquisition time values and a predetermined time of the predetermined times referenced to the absolute time standard to form the plurality of synchronized phasors.

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