Analiza metoda za mjerenje fazora u uređajima numeričke relejne zaštite korištenjem Fourierovih filtara

scientific master's theses

• Author: Tvrtko Mandić
• Mentor: Mario Cifrek (mentor)
• Committee member: Ante Marušić (predsjednik povjerenstva)
• Committee member: Mario Cifrek (član povjerenstva)
• Committee member: Juraj Šimunić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Electronic Systems and Information Processing); Zagreb
• Defense date and country: 2008-06-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Electronics
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing; Data Processing
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U radu su analizirane metode za mjerenje fazora u uređajima numeričke relejne zaštite korištenjem Fourierovih filtara. Obrađene su značajke Fourierovih filtara s obzirom na duljinu impulsnog odziva. Metode za korekciju utjecaja eksponencijalno padajuće istosmjerne komponente odabrane su s obzirom na domenu korekcije (frekvencijska ili vremenska domena) i složenost njihove implementacije. Metode su analizirane optimizacijom odziva amplitude mjerenog fazora, s obzirom na parametre signala kvara. Definirana su mjerila kvalitete za ocjenu efikasnosti eliminacije utjecaja eksponencijalno padajuće istosmjerne komponente. Svaka od razmatranih metoda primijenjena je na stvarne signale kvarova.

Abstract (english)

This thesis presents analysis of phasor measurement methods in digital protective relays by using Fourier filters. Characteristics of Fourier filters have been investigated with respect to their impulse response length. Methods for suppression of exponentially decaying DC offset have been chosen with respect to type of correction domain (frequency or time domain) and numerical effort. Methods are analyzed by optimization of measured phasor amplitude response with respect to the fault signal parameters. Performance indices are defined in order to estimate suppression efficiency of exponentially decaying DC offset. Each investigated method is applied on real fault signals.

• Keywords: Fourierov filtar; uklanjanje eksponencijalno padajuće istosmjerne komponente; mjerenje fazora; diskretna Fourierova transformacija (DFT); numerička relejna zaštita; analiza pogreške
• Keywords (english): Fourier filter; suppression of exponentially decaying DC offset effects; phasor measurement; discrete Fourier transform (DFT); digital protective relays; error analysis
• Language: croatian
• URN:NBN: urn:nbn:hr:168:556950
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-05-25 07:44:29