ADAPTIVE DIGITAL RELAYING USING LEAST MEAN SQUARES ALGORITHMS

Abstract

Simple algoritims are developed to track the harmonic structure of the voltages or currents in a power system. The algorithms are based on fitting the measured signal adaptively to an appropriate model in a least mean squares (LMS) sense. The update is accomplished employing the well known adaptive LMS and signed LMS algorithms. The input sequence at each iteration consists of samples of harmonic sinusoids with a fundamental equal to the power frequency. It is shown that such input satisfies the persistence of excitation condition. It is also shown that the algorithms are computationally simple, practically tractable, and exhibit guaranteed stability. The performance of the algorithms and their efficiency in digital relaying in power system protection problems are demonstrated.

Citation

HAWEEL, T.I. (1994), "ADAPTIVE DIGITAL RELAYING USING LEAST MEAN SQUARES ALGORITHMS", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 13 No. 3, pp. 471-481. https://doi.org/10.1108/eb010129