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Title:Modeliranje in optimizacija napetostnih in temperaturnih razmer pri načrtovanju elementov elektroenergetskega sistema
Authors:Sarajlić, Mirza (Author)
Pihler, Jože (Mentor) More about this mentor... New window
Files:.pdf DOK_Sarajlic_Mirza_2019.pdf (4,34 MB)
MD5: 8B9F3AD632077CE775C5D61132B9829E
 
Language:Slovenian
Work type:Doctoral dissertation (mb31)
Typology:2.08 - Doctoral Dissertation
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Doktorska disertacija obravnava načrtovanje in optimizacijo elementov elektroenergetskega sistema. Ti elementi morajo biti povezani v celoto, da porabnikom električne energije zagotovijo zanesljivo oskrbo in ekonomično rabo kakovostne električne energije. Obravnavani elementi elektroenergetska sistema v doktorski disertaciji so: taljive varovalke, podporni izolatorji in nadzemni goli vodniki. Načrtovanje in optimizacija obravnavanih elementov elektroenergetskega sistema je kompleksen postopek, zaradi česa je uporabljen uspešen in robusten algoritem diferenčne evolucije pri identifikaciji potrebnih parametrov numeričnega modela posameznega elementa. Pri taljivi varovalki je tako izvedena identifikacija toplotnih parametrov varovalke s ciljem napovedi temperature zunanjih in notranjih delov varovalke, na podlagi rezultatov laboratorijskih meritev in 3D numeričnega modela varovalke. Klasični algoritem diferenčne evolucije je primerjan s tremi modificiranimi algoritmi, ki zmanjšujejo število populacije tekom optimizacijskega procesa. Na ta način zmanjšajo tudi čas konvergence. Rezultati vseh štirih algoritmov so primerjani in podana je najboljša izbira algoritma za takšne izračune temperaturnih koeficientov. Pri podpornem izolatorju je izvedena identifikacija parametrov interpolacijskega polinoma s ciljem oblikovanja optimalne zunanje oblike pri čemer je minimizirana električna poljska jakost v notranjosti in okolici izolatorja. Pri dinamičnem modelu nadzemnega vodnika je izvedena napoved temperature vodnika, ki odločilno vpliva na dopustno obremenitev le-tega. Zato je uporabljena toplotna enačba in so opravljene meritve na realnem poligonu v realnih pogojih.
Keywords:elektroenergetski sistem, taljive varovalke, podporni izolatorji, nadzemni vodniki, optimizacija, diferenčna evolucija, električno polje, temperaturno polje
Year of publishing:2019
Publisher:[M. Sarajlić]
Source:Maribor
UDC:621.315.62:621.316.9(043.3)
COBISS_ID:22617110 New window
NUK URN:URN:SI:UM:DK:3YFKFCKS
Views:612
Downloads:130
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FERI
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:19.04.2019

Secondary language

Language:English
Title:Design of the electric power system elements through modeling and optimization of voltage and temperature conditions
Abstract:Doctoral thesis deals with the modeling and optimization of the electric power system elements. These elements must be connected as a whole in order to provide reliable power supply and economical use of high-quality electricity. Doctoral thesis discusses the following elements of the electric power system: melting fuses, post insulators and overhead lines. The modeling and optimization of the discussed electric power system’s elements is a complex procedure. Hence the use of the successful and robust differential evolution algorithm for identifying the crucial parameters of the numerical model for an individual element. In the case of the melting fuse, the identification of the fuse’s thermal parameters is carried out with the aim of predicting the temperature of the external and internal parts of the fuse. The identification is based on the results of laboratory measurements and the 3D numerical model of the fuse. The classical algorithm of differential evolution is compared with three modified algorithms which reduce the number of population during the optimization process. This also reduces the convergence time. The results of all four algorithms are compared and the most favorable choice of algorithm is given for such calculations of thermal parameters. In the case of the post insulator, the identification of the interpolation polynomial’s parameters is carried out with the aim of designing the insulator’s optimum external shape, minimizing the electric field strength in the insulator’s interior and surroundings. In the case of the dynamic model of overhead line, the prediction of conductor’s temperature is carried out, as it has a decisive impact on the allowable load on the conductor. The heat equation is used and the measurements are carried out on the real polygon in real conditions.
Keywords:power system, melting fuse, post insulator, overhead line, optimization, differential evolution, electric field, temperature field


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