Apparatus and method for estimating synchronized phasors at predetermined times referenced to an absolute time standard in an electrical system
First Claim
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 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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Abstract
An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system. The method includes acquiring and determining a frequency of a power system signal, sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form signal samples, and generating a plurality of acquisition time values based on an occurrence of each of the signal samples at a corresponding plurality of different times referenced to the absolute time standard. The method further includes adjusting a phasor of each of the signal samples based on a time difference between a corresponding selected acquisition time value and a predetermined time referenced to an absolute time standard to form the plurality of synchronized phasors.
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Citations
62 Claims
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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:
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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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 34)
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24. A method for estimating a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system, the method comprising:
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determining a frequency of a power system signal;
sampling the power system signal at a sampling interval rate based on the frequency of the power system signal to form a plurality of signal samples;
generating 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
for each of the plurality of signal samples, adjusting the phasor magnitude and the phasor phase angle 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. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A method for estimating a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system, the method comprising:
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acquiring a power system signal;
determining a frequency of the power system signal;
sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form a plurality of signal samples;
generating a plurality of acquisition time values based on an occurrence of each of the plurality signal samples at a corresponding plurality of different 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
for each of the plurality of signal samples, interpolating the phasor magnitude and rotating phasor phase angle to form a corresponding plurality of referenced phasor magnitudes and referenced phasor phase angles of the plurality of synchronized phasors 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. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification