POWER WAVEFORM HARMONIC ANALYSIS USING SUMMED SAMPLES
First Claim
1. A method of characterizing a power waveform, the method comprising:
- sampling the power waveform to generate a plurality of samples;
recursively performing the following for each of the samples;
processing the sample to generate an aggregate signal energy value;
processing the sample to generate a harmonic component signal energy value associated with at least one target harmonic frequency; and
accumulating the aggregate signal energy value and the harmonic component signal energy value with previously generated aggregate signal energy values and harmonic component signal energy values to generate an accumulated aggregate signal energy value and an accumulated harmonic component signal energy value; and
wherein the method further comprisescharacterizing the power waveform responsive to the accumulated aggregate signal energy value and the accumulated harmonic component signal energy value.
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Abstract
Provided are methods and apparatus for characterizing a power waveform. Some such methods include sampling the power waveform to generate a plurality of samples and, for each of the samples, recursively processing the sample to generate an aggregate signal energy value, processing the sample to generate a harmonic component signal energy value associated with at least one target harmonic frequency, and accumulating the aggregate signal energy value and the component signal energy value with previously generated aggregate signal energy values and component signal energy values to generate an accumulated aggregate signal energy value and an accumulated harmonic component signal energy value. Methods also include characterizing the power waveform responsive to the accumulated aggregate signal energy value and the accumulated harmonic component signal energy value.
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Citations
20 Claims
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1. A method of characterizing a power waveform, the method comprising:
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sampling the power waveform to generate a plurality of samples; recursively performing the following for each of the samples; processing the sample to generate an aggregate signal energy value; processing the sample to generate a harmonic component signal energy value associated with at least one target harmonic frequency; and accumulating the aggregate signal energy value and the harmonic component signal energy value with previously generated aggregate signal energy values and harmonic component signal energy values to generate an accumulated aggregate signal energy value and an accumulated harmonic component signal energy value; and
wherein the method further comprisescharacterizing the power waveform responsive to the accumulated aggregate signal energy value and the accumulated harmonic component signal energy value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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a sample generator circuit configured to generate samples of a power waveform signal; a signal energy determiner circuit configured to recursively; determine an aggregate signal energy value;
to determinea harmonic real signal energy value associated with at least one target harmonic frequency and a harmonic imaginary signal energy value associated with the at least one target harmonic frequency;
toaccumulate the aggregate signal energy value with a sum of previously generated aggregate signal energy values; and
toaccumulate the harmonic component signal energy value with a sum of previously generated harmonic component signal energy values; and a power waveform characterizer configured to characterize the power waveform responsive to the accumulated aggregate signal energy value and the accumulated harmonic component signal energy value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of characterizing a power waveform, comprising:
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synchronizing a sampling frequency to an integer factor of a first harmonic frequency; sampling, at the sampling frequency, the power waveform to receive a fixed quantity of a plurality of sample values; summing selected harmonic components of the plurality of sample values; summing aggregate signal energy values of the plurality of sample values; and calculating total harmonic distortion responsive to the sums of the selected harmonic components and sums of the aggregate signal energy values.
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Specification