This research presents a method for frequency estimation in power system using adaptive filter based on the Least Mean Square algorithm (LMS). In power system analysis, the three-phase voltages are converted to a complex signal with the application of α β-transform whose complex form was submitted to the algorithm of adaptive filtering. The computational simulations were accomplished using the software ATP. This utilization had as objective to generate data for the most severe and different situations for the verification and analysis of the proposed methodology. The results were to those of a commercial relay for validation, showing the advantages of the new method.
frequency estimation; adaptive filter; digital protection; power system; least mean square
