Abstract
This paper presents an algorithm for measuring power system frequency and frequency deviations at a power system bus. The technique uses digitized samples of distorted voltage at a relay location to measure the frequency of the fundamental component effectively. The voltage signal is assumed to be composed of a fundamental and many harmonic components. The method is capable of tracking local system frequency in as short a duration as a fraction of a power frequency cycle. Theoretical analysis of the algorithm is presented and the effects of critical parameters on the relay performance are discussed. The algorithm was tested using simulated data and data recorded from a dynamic frequency source. The results showed that the proposed technique is accurate even with severely distorted relaying signals.
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