Metoda proračuna širenja flikera uzrokovanih priključkom elektrolučne peći na elektroenergetsku mrežu.

doctoral thesis

• Title (english): Method for calculation of flicker propagation caused by electric arc furnace connectuin to power system network.
• Author: Ana Tomasović Teklić
• Mentor: Ivica Pavić (mentor)
• Committee member: Ivica Pavić (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
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Kvaliteta električne energije (KEE) je obilježje električne energije u određenoj točki elektroenergetskog sustava (EES) promatrano u usporedbi s referentnim tehničkim parametrima koji se određuju na temelju višegodišnjih iskustava stečenim analizama stanja u elektroenergetskim mrežama. Održavanje određene razine kvalitete napona u nekoj točki mreže je obveza operatora sustava, a nužno je zbog ispravnog rada opreme koja je priključena na elektroenergetski sustav. Ovu zadaću operator sustava provodi ograničavanjem negativnog povratnog djelovanja opreme svih korisnika mreže. Svaki korisnik mreže - kupac ili proizvođač električne energije je dužan povratna djelovanja svoje opreme na kvalitetu napona (injektiranje viših harmonika, uzimanje jalove snage, emisija flikera i nesimetrije opterećenja) svesti na propisane (unaprijed dogovorene) granične vrijednosti koje u načelu određuje nadležni operator sustava. U ovom radu opisana je metoda za rješavanje problematika širenja flikera kroz elektroenergetsku mrežu. Pri tome je bilo važno vjerno modelirati trošila sa fluktuirajućim karakterom iznosa opterećenja kao izvor flikera (u ovom radu opisan je model elektrolučne peći), kao i elemente elektroenergetske mreže (nadzemni vodovi, kabeli, transformatori), kako bi se moglo pravilno prikazati širenje flikera po različitim naponskim razinama. Dobiveni rezultati proračuna širenja flikera kroz mrežu su uspoređeni s istovremenim mjerenjima razine flikera u više čvorišta elektroenergetskog sustava, tijekom rada elektrolučne peći, čime je napravljena verifikacija predložene metode.

Abstract (english)

Power quality (PQ) is a characteristic of electricity at a given point in the power system (PS) when compared to the reference technical parameters that are determined based on years of experience gained from the analysis of power grid states. Maintaining a certain level of voltage quality at some point in the network is an obligation of the system operator, and it is necessary for the proper operation of the equipment connected to the power system. The system operator performs this task by limiting the negative influence of the equipment of all network users. Each network user - buyer or producer of electricity is obliged to reduce the negative influence of his equipment on voltage quality (injection of harmonics, reactive power, flicker emission, and load asymmetry) to the prescribed (pre-agreed) values, which are generally determined by the relevant system operator. This thesis describes a method for solving flicker propagation problems through the power grid. It was important to accurately model the fluctuating loads as a flicker source (this paper describes a model of an electric arc furnace), as well as the elements of the power grid (overhead lines, cables, transformers), so that flicker propagation through different voltage levels could be estimated. The results of the calculation of flicker propagation through the network were compared with simultaneous measurements of the flicker level in several nodes in the power system, during the operation of the arc furnace, which was used for the verification of the proposed method.

• Keywords: kvaliteta električne energije; kvaliteta napona; negativno povratno djelovanje; nelinearno trošilo; viši harmonici; flikeri; elektrolučna peć.
• Keywords (english): power quality; voltage quality; negative influence; nonlinear load; harmonics; flicker; electric arc furnace
• Language: croatian
• URN:NBN: urn:nbn:hr:168:082165
• 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: 111 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-01-23 09:32:37