A Demodulation Technique For Power System Local Frequency And Voltage Measurements

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Author Soliman, S.A. en_US
Author Alammari, R. A. en_US
Author Al-Kandari, M. A. en_US
Author El-Hawary, M. E. en_US
Available date 2009-11-25T13:06:01Z en_US
Publication Date 2003 en_US
Citation Engineering Journal of Qatar University, 2003, Vol. 16, Pages 99-108. en_US
URI http://hdl.handle.net/10576/7959 en_US
Abstract The demodulation technique of two complex signals is used to estimate the power system local frequency and voltage phasor. The first complex signal is generated from the three-phase voltage waveform by using the ab-transformation, while the second complex signal is assumed to have a one per unit amplitude and to rotate in a direction opposite to the original three-phase voltage signals with nominal frequency wo(negative sequence signal). Use of the demodulation technique does not introduce a double frequency component, which limits the speed of the frequency estimator especially, if the signal has a high signal to noise ratio. Two closed form formulae are derived based on the least error squares (LES) algorithm, for system frequency as well as its phase angle. It is shown that using such a technique, a very short data window size can be used to measure the power system frequency. To be specific, a minimum of two samples data window is enough for the noise free signals. en_US
Language en en_US
Publisher Qatar University en_US
Subject Engineering: Electrical Engineering en_US
Title A Demodulation Technique For Power System Local Frequency And Voltage Measurements en_US
Type Article en_US
Pagination 99-108 en_US
Volume Number 16 en_US


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