Adaptive Prony Method for the Calculation of Power-Quality Indices in the Presence of Nonstationary Disturbance Waveforms

• Published in: IEEE transactions on power delivery Vol. 24; no. 2; pp. 874 - 883
• Main Authors: Andreotti, A., Bracale, A., Caramia, P., Carpinelli, G.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Capacitors; Disturbances; Disturbances. Regulation. Protection; Electric potential; Electrical engineering. Electrical power engineering; Electrical power engineering; Exact sciences and technology; Mathematical analysis; Miscellaneous; Operation. Load control. Reliability; Power electronics, power supplies; Power networks and lines; Power quality; Power quality (PQ); Power system analysis computing; Power system simulation; Power system transients; power systems; Prony method; Signal analysis; Signal processing; Signal resolution; Spectra; Switching; Time frequency analysis; Voltage; Voltage fluctuations; Waveforms; Deregulation; Power system economics; Power system stability; Power electronics; Adaptive method; Capacitor switching; Electrical network; time-frequency analysis; Spectrum analysis; Voltage stability; Signal processing; Energy quality; power systems; Voltage dip; Time analysis; Service quality; Power quality (PQ); Electric fault; Prony method
• ISSN: 0885-8977; 1937-4208
• DOI: 10.1109/TPWRD.2008.923992

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.