Analiza frekvenčnih karakteristik impedance najpogosteje uporabljenih modelov električnih vodov

ŽERJAV, MATEJ (author), Blažič, Boštjan (mentor)

V magistrski nalogi smo se dotaknili analize frekvenčnih karakteristik modelov električnih vodov, ki se najpogosteje uporabljajo v simulacijskih programih. V to skupino spadajo predvsem Π modeli oziroma serijsko vezani Π modeli, ki s svojo strukturo prikazujejo realne vrednosti le do določenega frekvenčnega območja Prikazana je matematična predstavitev najbolj pogosto uporabljenih modelov električnih vodov v računalniških programih. Ker ima impedanca pri višje harmonskem popačenju pomembno vlogo, je predstavljen tudi vpliv le te na izbor določenega modela električnega voda. Temu sledi opis, na kakšen način se lahko lotimo filtriranja visokofrekvenčnega popačenja električnega omrežja. Na koncu so predstavljene simulacije v programskem paketu DigSILENT. Rezultati so prikazani v obliki grafov, ki prikazujejo impedančne karakteristike v odvisnosti od frekvence, na frekvenčnem območju 10 kHz. Opazovali in primerjali smo razliko karakteristik med več serijsko vezanimi Π modeli električnih vodov in med modelom s porazdeljenimi parametri. Računsko smo določili »cenilko«, ki določa mejo, do katerega območja so rezultati za posamezen vod še zadovoljivi. Na podlagi cenilke smo za vsak vod določili primernost uporabe v okviru frekvenčnega območja in dolžine voda.

• Language: Slovenian
• Keywords: analiza modelov omrežja, frekvenčno-impedančne karakteristike, serijsko vezani Π modeli
• Work type: Master's thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2019
• PID: 20.500.12556/RUL-111437
• Publication date in RUL: 01.10.2019

Secondary language

• Language: English
• Title: Analysis of impedance frequency characteristics of commonly used power line models

Abstract

High frequency analysis of individual components in transmission network is being discussed in this master’s degree. Master’s degree begins with mathematic presentation on commonly used models of electrical transmission lines in computer programs. Due to large impact of impedance at high harmonic distortion, this impact is also presented when selecting the specific model of transmission lines. This is followed by description of largest impacts on impedance in light of high harmonics and description of possible filtration methods for high frequency distortion in electrical transmission network. Master’s degree is concluded with simulation, developed in program suite DigSILENT. Results are displayed in the form of graphs, depicting dependency of impedance on frequency at the frequency range 10 kHz. Noted and compared was the difference between several serial connected Π models against model with distributed parameters. ‘’Break value’’ was calculated to determine limit, up to which the results for individual transmission line is still acceptable. This break value then enabled us to determine whether each transmission line is suitable for use within frequency range and line length

• Keywords: network models analysis, frequency vs. impedance characteristics, series connection of Π models