Uravnoteženje opterećenja razdjelnih mreža pomoću teorije neizrazitih skupova

scientific master's theses

• Author: Goran Majstrović
• Mentor: Slavko Krajcar (mentor)
• Committee member: Vladimir Mikuličić (predsjednik povjerenstva)
• Committee member: Slavko Krajcar (član povjerenstva)
• Committee member: Željko Hocenski (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Defense date and country: 2001-09-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Power Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Uravnotežavanje opterećenja transformatora i pojnih vodova smanjuje rizik od preopterećenja zbog čestih promjena opterećenja u razdjelnim mrežama. Na taj način se smanjuje učestalost i trajanje kvarova izazvanih preopterećenjem. U ovom radu se predstavlja metoda uravnotežavanja opterećenja u razdjelnim mrežama temeljena na teoriji neizrazitih skupova. Pri tom se istovremeno razmatra uravnotežavanje ukupnog opterećenja transformatora i pojnih vodova i simetriranje faznih opterećenja.
Budući da je životni vijek sklopnih uređaja definiran ukupnim brojem provedenih sklapanja, postupak uravnotežavanja i simetriranja opterećenja je potrebno provesti uz minimalni broj sklapanja.
U ovom radu je ukratko predstavljena i Aokijeva metoda uravnotežavanja opterećenja u razdjelnim mrežama koja se koristi u EES-u Japana, te se uspoređuje s predstavljenom metodom teorije neizrazitih skupova.
Metoda teorije neizrazitih skupova primijenjena je na općenitom primjeru razdjelne mreže, kao i na dijelu 10 kV mreže grada Pule.

Abstract (english)

Transformer load balancing and feeder load balancing are used to decrease the overload risk due to load changes. According to that fault frequency and duration are also decreased as an overload consequence.
This thesis deals with distribution load balancing method based on fuzzy set theory. Thereby transformer load balancing, feeder load balancing and phase balancing are analysed simultaneously.
Switchgear lifetime is defined by number of switching operations. So, load balancing should be performed by the minimum number of switching operations.
Fuzzy set load balancing method is compared to the Aoki’s method that is also shortly presented in this work. Aoki’s method has been widely used in Japanese power system.
Proposed fuzzy set load balancing method is presented on a general example and on part of 10 kV Pula city network.

• Keywords: Teorija neizrazitih skupova; funkcija pripadnosti; uravnotežavanje opterećenja; simetriranje faznih opterećenja; broj sklapanja
• Keywords (english): Fuzzy logic; membership function; transformer load; feeder load; load balancing; phase balancing; number of switching operations
• Language: croatian
• URN:NBN: urn:nbn:hr:168:847207
• 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: 2019-04-19 08:57:46