APPARATUS AND METHOD FOR ESTIMATING SYNCHRONIZED PHASORS AT PREDETERMINED TIMES REFERENCED TO A COMMON TIME STANDARD IN AN ELECTRICAL SYSTEM
First Claim
1. An apparatus for estimating a plurality of synchronized phasors at predetermined times referenced to common time standard in an electrical power system, the apparatus comprising:
- a sampling means configured to sample a power system signal at a select sampling interval rate 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 common 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 common time standard to form the plurality of synchronized phasors.
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Accused Products
Abstract
An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to a common 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 common 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 a common time standard to form the plurality of synchronized phasors.
69 Citations
72 Claims
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1. An apparatus for estimating a plurality of synchronized phasors at predetermined times referenced to common time standard in an electrical power system, the apparatus comprising:
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a sampling means configured to sample a power system signal at a select sampling interval rate 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 common 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 common 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, 24, 25, 26, 27)
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28. A method for estimating a plurality of synchronized phasors at predetermined times referenced to a common time standard in an electrical power system, the method comprising:
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sampling a power system signal at a sampling interval rate 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 common 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 common time standard to form the plurality of synchronized phasors. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A method for estimating a plurality of synchronized phasors at predetermined times referenced to a common time standard in an electrical power system, the method comprising:
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sampling a power system signal at a select sampling interval rate 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 common 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 common time standard. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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Specification