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Estimating Interharmonics by Using Sliding-Window ESPRIT

Irene Y.H. Gu (Institutionen för signaler och system, Signalbehandling) ; Math H.J. Bollen
IEEE Transactions on Power Delivery (0885-8977). Vol. 23 (2008), 1, p. 13-23.
[Artikel, refereegranskad vetenskaplig]

Nyckelord: power quality, damped sinusoidal model, ESPRIT, sliding-window ESPRIT, time-frequency analysis of disturbances, features classification.


A method is proposed for estimating interharmonic frequencies in power-system voltage and current signals. The method is based on a spectrum-estimation method known as "Estimation of Signal Parameters via Rotational Invariance Techniques" or ESPRIT. To allow for a more reliable spectral estimation and to cover non-stationarity in the signal, a sliding-window version of ESPRIT is introduced. The paper describes the basic ESPRIT method as well as sliding-window ESPRIT. The paper discusses the application of the method to one synthetic signal and three measurement signals. It is shown that the method allows for very accurate frequency estimation of interharmonic components. The limitations of the methods, like line splitting and spurious components, can be overcome by using the redundant information obtained from the sliding-window method. A number of remaining issues are also discussed in the paper.



Denna post skapades 2007-05-01. Senast ändrad 2013-01-24.
CPL Pubid: 41051

 

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