Adaptive harmonic estimation for power system protection

T.I. Haweel (Electrical Engineering Department, Assiut University, Assiut, Egypt)


Many power system protection problems necessitate the measurement and track of the underlying current/voltage phasors. Adaptive LMS spectrum analyzers provide an ideal solution to such problems. This paper introduces a class of adaptive trigonometric spectrum analyzers. The underlying current/voltage is fed as a desired signal to an LMS adaptive algorithm. The reference input is a periodic regression derived from the basis set of the specified trigonometric discrete transform. The proposed algorithm is simple, computationally efficient, and exhibits a guaranteed stability and uniform convergence. A comparative study recommends the discrete Hartley transform. Simulations are provided to prove that the proposed spectrum analyzer is efficient in modeling faulty power system currents/voltages such as these arising from an over‐excitation of a power transformer.



Haweel, T. (2000), "Adaptive harmonic estimation for power system protection", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 19 No. 4, pp. 1007-1015.

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