An Effective Dynamic Current Phasor Estimator for Synchrophasor Measurements

Accurate voltage and current phasor measurements are required to be provided by phasor measurement units placed at various buses in the system. This paper presents an effective method for estimation of alternating current signal fundamental phasor under dynamic conditions. The model-order estimation...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2015-03, Vol.64 (3), p.625-637
Main Authors: Banerjee, P., Srivastava, S. C.
Format: Article
Language:English
Subjects:
Current phasor
dc offset
dynamic phasor estimation
Estimation
Harmonic analysis
interharmonics
Noise
Oscillators
Phasor measurement units
Power system dynamics
Power system harmonics
total least square estimation of signal parameters via rotational invariance techniques (TLS-ESPRIT)
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Summary:Accurate voltage and current phasor measurements are required to be provided by phasor measurement units placed at various buses in the system. This paper presents an effective method for estimation of alternating current signal fundamental phasor under dynamic conditions. The model-order estimation of the current signal has been carried out to separate the signal space and the noise space in the signal correlation matrix. The Vandermonde matrix of the total least square estimation of signal parameters via rotational invariance techniques method is extended to second-order Taylor's series approximation to estimate the dynamic phasor of the current signal. The suggested technique for the phasor estimation has been tested on simultaneous multimode amplitude and phase oscillations with decaying dc offset and noninteger harmonics, in the presence of noise and also for a fault scenario in New England 39-bus system. This paper also provides a few suggestions for a few possible amendments in the IEEE synchrophasor standard.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2014.2349232