Title :
Adaptive Prony Method for the Calculation of Power-Quality Indices in the Presence of Nonstationary Disturbance Waveforms
Author :
Andreotti, A. ; Bracale, A. ; Caramia, P. ; Carpinelli, G.
Author_Institution :
Dept. of Electr. Eng., Univ. of Napoli Federico II, Napoli
fDate :
4/1/2009 12:00:00 AM
Abstract :
The presence of the new liberalized markets has increased the interest in power-quality (PQ) disturbances due to their economic effect. In particular, in the case of disturbances caused by a single event (such as a capacitor switching or voltage sag), the waveform assessment can be difficult due to the rapid variations in waveform spectral component characteristics; these difficulties require a suitable choice of signal-processing techniques for spectral analysis and, in particular, the resort to time-frequency representations. In this paper, the adaptive Prony method is proposed to calculate PQ indices based on a time-frequency analysis of waveforms. Numerical applications on a simulated transient due to capacitor switching, a measured voltage sag, and a test waveform are also presented and discussed in order to investigate the validity of the proposed method.
Keywords :
electricity supply industry deregulation; power supply quality; time-frequency analysis; adaptive Prony method; liberalized markets; nonstationary disturbance waveforms; power-quality indices; time-frequency analysis; waveform assessment; Power quality (PQ); Prony method; power systems; time–frequency analysis;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2008.923992