System and method for synchronized phasor measurement
AssigneeGeneral Electric Company
InventorsWilliam James Premerlani, Bogdan Zdzislaw Kasztenny, Mark Gerard Adamiak
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Abstract
A phasor measurement system is provided for computing synchronized phasor measurements. The phasor measurement system includes acquisition circuitry for acquiring voltage or current values from a power line, sampling circuitry for sampling the voltage or current values, and processing circuitry for computing a phasor and at least one time derivative of the phasor based on the sampled voltage or current values and for computing a synchronized phasor value based on the phasor and the at least one time derivative of the phasor.
Claims23
A method for synchronized phasor measurement in a multiphase power system, the method comprising:
- sampling voltage or current values;
- computing a phasor and at least one time derivative of the phasor based on the sampled voltage or current values;
- computing a synchronized phasor value based on the phasor and the at least one time derivative of the phasor, wherein computing the synchronized phasor value comprises compensating the phasor with the at least one time derivative of the phasor for effects of transients in magnitude or phase angle of the phasors;
- and
- controlling or monitoring an electrical device based upon the synchronized phasor value.
A method for synchronized phasor measurement in a multiphase power system, the method comprising:
- sampling voltage or current values synchronously with respect to a global positioning system reference clock;
- computing a phasor and at least one time derivative of the phasor based on the sampled voltage or current values;
- computing a synchronized phasor value based on the phasor and the at least one time derivative of the phasor without resampling the voltage or current values, wherein computing the synchronized phasor value comprises compensating the phasor with the at least one time derivative of the phasor for effects of transients in magnitude or phase angle of the phasors;
- and
- controlling or monitoring an electrical device based upon the synchronized phasor value.
A method for synchronized phasor measurement in a multiphase power system, the method comprising:
- sampling voltage or current values synchronously at a power system frequency;
- computing a phasor and at least one time derivative of the phasor based on the sampled voltage or current values;
- computing a synchronized phasor value based on the phasor and the at least one time derivative of the phasor without resampling the voltage or current values, wherein computing the synchronized phasor value comprises compensating the phasor with the at least one time derivative of the phasor for effects of transients in magnitude or phase angle of the phasors;
- and
- controlling or monitoring an electrical device based upon the synchronized phasor value.
A method for synchronized phasor measurement in a multiphase power system, the method comprising:
- sampling voltage or current values at a frequency that is independent of a power system frequency and a reference clock frequency;
- computing a phasor and at least one time derivative of the phasor based on the sampled voltage or current values;
- computing a synchronized phasor value based on the phasor and the at least one time derivative of the phasor without resampling the voltage or current values, wherein computing the synchronized phasor value comprises compensating the phasor with the at least one time derivative of the phasor for effects of transients in magnitude or phase angle of the phasors;
- and
- controlling or monitoring an electrical device based upon the synchronized phasor value.
A phasor measurement system, comprising:
- acquisition circuitry for acquiring voltage or current values from a power line;
- sampling circuitry for sampling the voltage or current values;
- and
- processing circuitry for computing a phasor and at least one time derivative of the phasor based on the sampled voltage or current values and for computing a synchronized phasor value based on the phasor and the at least one time derivative of the phasor, wherein computing the synchronized phasor value comprises compensating the phasor with the at least one time derivative of the phasor for effects of transients in magnitude or phase angle of the phasors.
A computer readable media, comprising:
- code adapted to sample voltage or current values;
- code adapted to compute a phasor and at least one time derivative of the phasor based on the sampled voltage or current values;
- code adapted to compute a synchronized phasor value based on the phasor and the at least one time derivative of the phasor, wherein the code adapted to compute the synchronized phasor value comprises code adapted to compensate the phasor with the at least one time derivative of the phasor for effects of transients in magnitude or phase angle of the phasors;
- and
- code adapted to control or monitor an electrical device based upon the synchronized phasor value.
A method for synchronized phasor measurement in a multiphase power system, the method comprising:
- sampling voltage or current values;
- computing a phasor and at least one time derivative of the phasor based on the sampled voltage or current values;
- computing a synchronized phasor value based on the phasor, the at least one time derivative of the phasor, and a difference between a sample time and a desired time;
- and
- controlling or monitoring an electrical device based upon the synchronized phasor value.
Dependencies are inferred from the claim text.