20.500.12556/DKUM-73460 Modeliranje in optimizacija napetostnih in temperaturnih razmer pri načrtovanju elementov elektroenergetskega sistema Design of the electric power system elements through modeling and optimization of voltage and temperature conditions 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. 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. elektroenergetski sistem taljive varovalke podporni izolatorji nadzemni vodniki optimizacija diferenčna evolucija električno polje temperaturno polje power system melting fuse post insulator overhead line optimization differential evolution electric field temperature field true true false [M. Sarajlić] Slovenski jezik Angleški jezik Doktorsko delo/naloga 2019-04-19 12:00:15 2019-09-24 09:55:14 2022-08-02 00:45:51 2019-09-28 03:11:06 2019 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.315.62:621.316.9(043.3) 22617110 URN:SI:UM:DK:3YFKFCKS DOK_Sarajlic_Mirza_2019.pdf DOK_Sarajlic_Mirza_2019.pdf 1 8B9F3AD632077CE775C5D61132B9829E c93cb56f75a6e8a4fcab6bc0fd0e8401a4cc5630263522eb8f99993cee997658 065846a1-7c11-11eb-bb7a-00155d0001ca 20.500.12556/dkum/29c3febd-0040-4869-abdc-7005e0a21374 https://dk.um.si/Dokument.php?lang=slv&id=138470 Fakulteta za elektrotehniko, računalništvo in informatiko 0 0 0