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An accurate phasor estimation is an important task for a correct operation of control and protection devices. The presence of aperiodic components in electrical signals is a major problem for the correct performance of digital filters. In addition, their stability is heavily conditioned by the distortion resulting from the noise inherent to signal processing. Consequently, a complete study of the behaviour of any filtering algorithm (in the presence of noise and aperiodic components) must be carried out before its implementation. Usually, numerical performance indices are used to measure the accuracy of a proposed method. In order to ease the analysis and comparison of different digital filters, a new set of graphic tools is presented in this paper. To illustrate the application of these graphic tools, a case study is presented with three different filtering algorithms developed for protection relaying.

Graphic tools for analysing the influence of noise and aperiodic components in the performance of digital filters: a case study