Vrednovanje indikatora kakvoće napona u prijenosnoj elektroenergetskoj mreži.

doctoral thesis

• Title (english): Evaluation of voltage quality indicators in power transmission network.
• Author: Denisa Galzina
• Mentor: Tomislav Tomiša (mentor)
• Mentor: Eraldo Banovac (komentor)
• Committee member: Tomislav Tomiša (član povjerenstva)
• Committee member: Eraldo Banovac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Defense date and country: 2019, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Power Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Tijekom nekoliko desetljeća kakvoća električne energije postajala je sve važniji čimbenik u opskrbi električnom energijom. To je proizašlo iz razloga što su kupci postajali sve svjesniji kakvoće električne energije i zato što su električna trošila postajala sve sofisticiranija i osjetljivija na naponske smetnje. U tom se napretku zanemarilo da određena trošila sama po sebi uzrokuju smetnje i emitiraju ih u mrežu. Prijenosna elektroenergetska mreža karakteristična je zbog svojih sudionika pa rješenja za održavanje kakvoće napona na srednjenaponskim ili niskonaponskim mrežama nisu primjenjiva u vođenju ove mreže. Operator sustava na niskonaponskoj razini može korisnika mreže isključiti iz mreže ukoliko negativno utječe na okolnu mrežu i ostale sudionike, ali operator prijenosnog sustava nema takve ovlasti zbog političko-ekonomske važnosti korisnika mreže. Kako bi se iznašao način rješavanja ovog problema, u disertaciji je prvo trebalo temeljito istražiti parametre kakvoće napona na cijeloj prijenosnoj mreži hrvatskog elektroenergetskog sustava. Zaključeno je da bi se dozvoljene vrijednosti parametara trebale određivati prema naponskoj razini na kojoj se mjere, a ne istom normom određivati dozvoljene vrijednosti na svim naponskim razinama. Nakon toga napravljen je proračun potrebnih snaga uređaja za korigiranje vrijednosti parametara kakvoće napona, kako bi se u svakom čvorištu mreže ti parametri održavali unutar dozvoljenih granica. Na temelju tog proračuna formiran je prijedlog sustava kazni, poticaja i obeštećenja, koji bi trebalo implementirati kako bi se svi korisnici mreže poticali da smanje eventualni negativni povratni utjecaj njihovih trošila na kakvoću mrežnog napona. Na kraju, u disertaciji je zasnovan algoritam koji jednako tretira sve korisnike mreže, na način da nitko ne bude zakinut u ostvarivanju prava na isporuku električne energije garantirane kakvoće. Algoritam je verificiran na primjerima stvarne prijenosne mreže čime je potvrđeno da bi regulativu vezanu za tematiku kakvoće električne energije trebalo dopuniti sa sustavom kazni, poticaja i obeštećenja.

Abstract (english)

Over several decades, power quality has become an increasingly important factor in electricity supply. This was because customers were becoming more aware of the quality of the electricity and because the electrical appliances were becoming more sophisticated and sensitive to voltage disturbances. In this progress, it has been neglected that certain appliances by themselves cause interference and broadcast them to the network. The transmission network is characterized by its participants. Therefore, solutions for maintaining the voltage quality on medium voltage or low voltage networks are not applicable in running the transmission network. A low-voltage system operator may disconnect a network user from the network if it adversely affects the surrounding network and other participants, but the transmission system operator does not have such authority because of the political and economic importance of the network user. In order to find a way to solve this problem, in the dissertation it was first necessary to thoroughly investigate the parameters of voltage quality on the entire transmission network of the Croatian electricity system. It was concluded that the allowable values of the parameters should be determined according to the voltage level at which they are measured, and not the same norm to determine the allowable values at all voltage levels. After that, the necessary device powers for correcting the values of the voltage quality parameters were made, in order to keep these parameters within the allowed limits at each node of the network. Based on this calculations, a proposal for a system of penalties, incentives and compensations was formed, which should be implemented to encourage all network users to reduce the potentially negative impact of their facilities on the of the network’s voltage quality. Finally, an algorithm was developed in the dissertation that treats all network users equally, in such a way that no one is withheld the right to electricity of guaranteed quality. The algorithm was verified on the examples of the actual transmission network, which confirmed that the legislation related to power quality should be supplemented with a system of penalties, incentives and compensation.

• Keywords: kakvoća električne energije; kakvoća napona; prijenosna mreža; harmonička izobličenja; flikeri; algoritam
• Keywords (english): power quality; voltage quality; transmission network; harmonic distortion; flicker; algorithm
• Language: croatian
• URN:NBN: urn:nbn:hr:168:855020
• Study programme: Title: Electrical Engineering and Computing; Study programme type: university; Study level: postgraduate; Academic / professional title: Doktor znanosti elektrotehnike i računarstva (Doktor znanosti elektrotehnike i računarstva)
• Type of resource: Text
• Extent: 155 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-01-23 09:42:19