Measurement of magnitude and phase angle of voltage and current

Details Measurement of magnitude and phase angle of voltage and current Measurement of magnitude and phase angle of voltage and current

1985-01-23

1987-04-28

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 83R, G01R 2302

Patent

active

046617698

ABSTRACT:
Methods for determining magnitude, phase angle and frequency deviation in the sinusoid waveform output of electrical power generation equipment are disclosed. The first method uses a two-state linear Kalman filter to calculate the magnitude and phase angle from which the frequency deviation is calculated using the linear relationship between frequency deviation and the average rate of change of phase angle. In a second method, a three-state extended Kaman filter is employed. The frequency deviation is considered a third state variable and is recursively computed on-line.

REFERENCES:
patent: 3235800 (1966-02-01), Turrell
patent: 4455612 (1984-06-01), Girgis et al.
patent: 4547726 (1985-10-01), Premerlani

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