Abstract
This paper presents a symmetric three points IpDFT (S3IpDFT) method which can be associated with all combined cosine windows. The influence of spectral interference from image component and noise on the power system frequency estimation provided by the S3IpDFT is investigated. The expression for the absolute error of the normalized frequency caused by the spectral interference from image component is presented. Also, the analytical expression of the frequency estimation variance has been derived. The derived results are validated by means of computer simulations and experiments.
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