Povećanje sigurnosti napajanja i postizanja povoljnih vrijednosti treperenja napona u prijenostnoj mreži

scientific master's theses

• Title (english): The enhancement of security in supplying electrical energy and achievement of more favorable flicker values in transmission network
• Author: Robert Vlajčević
• Mentor: Ante Marušić (mentor)
• Committee member: Sejid Tešnjak (predsjednik povjerenstva)
• Committee member: Ante Marušić (član povjerenstva)
• Committee member: Marinko Stojkov (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Defense date and country: 2011-12-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U ovom radu rješavan je problem povećanja sigurnosti napajanja prijenosne 110 kV mreže sisačkog područja kao i problematika kvalitete napona u razmatranom dijelu elektroenergetskog sustava Republike Hrvatske. Analizirano je uklopno stanje prijenosne mreže kao i stanje opremljenosti relejne zaštite s telekomunikacijskim povezivanjem. U radu je detaljno obrađena problematika sekcionirane 110 kV mreže u TS 110/35/6.3 kV Rafinerija, kao i tehnički zahtjevi na promjene u mreži koji su uvjetovani Mrežnim pravilima elektroenergetskog sustava na sučelju s korisnikom mreže INA Rafinerija nafte Sisak. Predložena je nova koncepcija relejne zaštite za štićenje razmatranog dijela prijenosne mreže. Analizirana je problematika povišenih napona u prijenosnoj mreži sisačkog područja i predloženo tehničko rješenje. Detaljno je analizirano stanje problematike treperenja napona (flikera) u prijenosnoj mreži sisačkog područja nakon priključenja nove elektrolučne peći u CMC Sisak na 33 kV strani. Napravljena je analiza širenja flikera u prijenosnoj mreži, obavljena detaljna mjerenja kratkotrajnog i dugotrajnog flikera. Izračunate su kratkospojne snage na mjestu priključka elektrolučne peći u 110 kV čvoru priključka i okolnoj mreži, te se na osnovu rezultata mjerenja flikera za različita uklopna stanja izračunala očekivana vrijednost flikera za maksimalnu snagu peći od 43.5 MW. Predloženo je tehničko rješenje za sniženje flikera u prijenosnoj mreži sukladno Mrežnim pravilima elektroenergetskog sustava povezivanjem elektrolučne peći na 220 kV razinu preko transformacije 220/33 kV, uz dodatnu ugradnju dinamičke kompenzacije na 33 kV strani. Analizirane su prednosti predloženog tehničkog rješenja priključenja na 220 kV mrežu u odnosu na tehničko rješenje dinamičke kompenzacije s maksimalnom snagom. Predloženo tehničko rješenje omogućava korištenje transformatorske stanice TS Željezara za potrebe HEP-a, kroz mogućnost ugradnje transformacije 2x 40 MVA, čime bi se omogućilo napajanje novih korisnika distribucijske mreže na prostoru bivše Željezare Sisak, kao i budućih korisnika mreže. Predloženo tehničko rješenje rasterećuje 110 kV mrežu i trajno rješava problematiku flikera i povišenih napona sisačkog područja.

Abstract (english)

This work deals with the problem of increasing the safety of supply of 110 kV transmission network of the Sisak area as well as the problem of voltage quality in the considered part of the Croatian power system. The overall status of the transmission network is analyzed as well as the state of relay protection equipment and telecommunications connectivity. The paper examines the issue of sectioned 110 kV network in SS 110/35/6.3 kV Rafinerija in detail, as well as technical requirements and changes in the network that are due to Network Rules of power grid on interface with the system user “INA Oil Refinery” Sisak. A new concept of relay protection is proposed for the protection of the observed part of the transmission network. A problem of high voltages in transmission network in the Sisak area is also analyzed and the technical solution is proposed. The problem of voltage flicker in the transmission network in Sisak area after connecting a new electric arc furnace in CMC Sisak on 33 kV side is analyzed in detail. Preliminary analysis of the spread of flickers in the transmission network, and detailed measurements of short-term and long-term flickers is carried out. Short-circuit power at the connection of the electric arc furnace at the 110 kV node and the surrounding network is calculated. Based on the results of measurements of flicker for different switching states the expected value for the maximum power flickers furnaces of 43.5 MW is calculated. Technical solution for reducing flicker in the transmission network in accordance with the Network Rules for electricity is proposed by connecting an electric arc furnace at 220 kV level through the transformation of 220/33 kV, with the additional installation of dynamic compensation on 33 kV side. The proposed technical solution for connecting the 220 kV network is analyzed in relation to the technical solution of the dynamic compensation with maximum power. The proposed technical solution allows the use of transformer station TS Željezara for the HEP purposes, the possibility of a transformation of the 2 x 40 MVA, which would allow for the new users in the power distribution network on the grounds of former TS Željezara Sisak, as well as future users of the network. The proposed technical solution relieves the 110 kV network and permanently solves the problem of flickers and increased voltages in the Sisak area.

• Keywords: sigurnost napajanja; prijenosna mreža; kvaliteta napona; fliker; relejna zaštita; dinamička kompenzacija; povišeni naponi; mrežna pravila
• Keywords (english): security of supply; transmission networks; power quality; flicker; fault protection; dynamic compensation; high voltage; grid codes
• Language: croatian
• URN:NBN: urn:nbn:hr:168:513373
• 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)
• Catalog URL: http://lib.fer.hr/cgi-bin/koha/opac-detail.pl?biblionumber=37173
• Type of resource: Text
• Extent: 136 str ; 30 cm
• File origin: Born digital
• Access conditions: Closed access
• Repository: FER Repository
• Created on: 2020-09-07 06:59:55