An adaptive median post-filter for impedance estimation based on differential equation algorithm

Research output: Contribution to conferencePaperpeer-review

Abstract

This paper presents an application of the adaptive median post-filter to improve impedance estimation based on the differential equation algorithm. The main feature of the post-filter is the automatic selection of the optimal window size that balances between fast tracking and filtering performance. For sudden impedance change (fault inception), small window size is selected to make fault detection fast. Large window size is selected if the impedance is slow varying or steady-state (pre-fault and fault conditions) to increase filtering efficiency. The post-filter is also very efficient in eliminating impulsive noise created by numerical instability of the differential equation algorithm under certain conditions. The simulation results presented in the paper show the adaptive median post-filter enhances filtering performance of the differential equation algorithm while preserving fast tracking of the impedance during fault inception.

Original languageEnglish
Publication statusPublished - 2005
Externally publishedYes
Event15th Power Systems Computation Conference, PSCC 2005 - Liege, Belgium
Duration: 22 Aug 200526 Aug 2005

Conference

Conference15th Power Systems Computation Conference, PSCC 2005
CountryBelgium
CityLiege
Period22.08.200526.08.2005

Keywords

  • Adaptive technique
  • Distance protection
  • Impedance estimation
  • Median filters

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