Harmonic characteristic measuring method and harmonic characteri

Details Harmonic characteristic measuring method and harmonic characteri Harmonic characteristic measuring method and harmonic characteri

1998-07-13

2000-09-05

Metjahic, Safet

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Parameter related to the reproduction or fidelity of a...

324623, 324 7621, 361 76, 702 65, G01R 2728, G01R 2320, G01R 2316, G01R 2500, H02H 326

Patent

active

061148598

ABSTRACT:
Single-phase currents at two frequencies f.alpha. and f.beta. (f.alpha.<n.multidot.fs<f.beta.) of non-integral multiples of a system fundamental wave frequency fs sandwiching an targeted harmonic (frequency n.multidot.fs) are injected between two phases of a three-phase power system as interharmonic currents. A frequency analysis of measurement current and measurement voltage of each phase in the system is carried out and a positive-phase-sequence current I1, a positive-phase-sequence voltage V1, a negative-phase-sequence current I2, and a negative-phase-sequence voltage V2 are detected for each of the two frequencies f.alpha. and f.beta. in the system based on injecting of the interharmonic currents. Positive-phase-sequence and negative-phase-sequence admittances Y1 and Y2 or positive-phase-sequence and negative-phase-sequence impedances Z1 and Z2 are found for each of the frequencies f.alpha. and f.beta. in the system as Y1=I1/V1 and Y2=I2/V2 or Z1=V1/I1 and Z2=V2/I2. Interpolation operation is performed for finding positive-phase-sequence and negative-phase-sequence admittances or positive-phase-sequence and negative-phase-sequence impedances for the targeted harmonic in the system from the admittances Y1 and Y2 or the impedances Z1 and Z2 for the frequencies f.alpha. and f.beta..

REFERENCES:
patent: 4037138 (1977-07-01), Kobayashi
patent: 5933793 (1999-08-01), Yamada

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