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

Authors

  • J. Lázaro Department of Applied Mathematics E.T.S.I., Basque Country University (UPV/EHU) Author
  • M.A. Zorrozua Department of Electrical Engineering E.T.S.I., Basque Country University (UPV/EHU) Author
  • J.F. Miñambres Department of Electrical Engineering E.T.S.I., Basque Country University (UPV/EHU) Author
  • M.I. Sánchez Department of Applied Mathematics E.T.S.I., Basque Country University (UPV/EHU) Author
  • B. Larrea Department of Applied Mathematics E.T.S.I., Basque Country University (UPV/EHU) Author
  • I. Antiza GE Multilin Author

DOI:

https://doi.org/10.24084/repqj06.289

Keywords:

Digital filter, protection relaying, phasor estimation, signal processing, harmonic analysis

Abstract

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.

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Published

2024-01-15

Issue

Vol. 6 No. 1 (2008)

Section

Articles