20.500.12556/RUL-85496 Pojav feroresonance v električnem omrežju industrijskega porabnika Ferroresonance phenomenon in industrial-consumer power network Elektroenergetski sistem (EES) sestavljajo elementi, ki obratujejo v t.i. linearnem območju delovanja, čeprav so nelinearni. Nelinearnost v sistemu najpogosteje predstavljajo transformatorji zaradi lastnega magnetnega nasičenja. V omrežju se zaradi nelinearnosti pojavljajo harmonska nihanja. Na elementih omrežja pride do toka magnetizacije, ki hitro narašča in vsebuje višje harmonike. Višji harmoniki in hitro naraščanje toka pomeni tudi višje napetosti. Tipičen primer, ki nastane zaradi nasičenja elementov in povzroča prenapetosti, je feroresonanca. Feroresonanca je kompleksen in zapleten pojav, vendar pa zaradi svojevrstnega vpliva na omrežje, zanimiv za preučevanje in analiziranje. Pojavi se ob prisotnosti nelinearne induktivnosti in kapacitivnosti, ki je nujno potrebno, da sta v določenem razmerju. V prvem delu diplomske naloge so podrobno opisani pogoji, potrebni za nastanek pojava feroresonance in delitev pojava na vzporedno ter zaporedno feroresonanco. Opisani so tudi parametri elementov in začetni pogoji sistema, ki vplivajo na sam pojav. Feroresonanco prepoznamo po tipu nihanja, za katero so značilne štiri različne oblike nihajnih načinov. Te so osnovna, podharmonska, kvazi-periodična in kaotična oblika. Posledice pojava feroresonance so lahko katastrofalne, saj le te vodijo do različnih okvar notranje opreme sistema, v nevarnosti pa je tudi samo osebje. Zato je potrebno pojav razumeti, ga v določenih situacijah prepoznati in preprečiti oz. omejiti. Uporabljajo se različne metode, ki omejujejo ali povsem odpravijo pojav. Pri tem pa se uporabljajo tudi računalniške simulacijske metode, kot so npr. metoda spektralne gostote, metoda Poincarejeve ravnine, metoda v fazni ravnini, itd., ki s pomočjo simulacijskih programov zagotavljajo rešitve in potrebne podatke za postavitev ustrezne zaščite v sistemu. V drugem delu diplomske naloge je bila izvedena simulacija pojava feroresonance realnega omrežja na območju zaokroženega gospodarskega kompleksa (ZGK) Ravne. Pri tem je v pomoč uporabljen računalniški simulacijski program PSCAD (Power System Computer Aided Design). Omrežje sestavljajo ključni elementi, potrebni za nastanek feroresonance. To so podzemni kabelski vod (KV), napetostni transformator (NT) in vzbujalni vir. Simulacija temelji na grafičnem prikazu (pre)napetosti in tokov na posameznih elementih pri osnovni frekvenci. Rešitve so analizirane v trifaznem vezju, v katerem se je feroresonanca pojavila. Z določenimi parametri so raziskane temeljne lastnosti pojava feroresonance. Pri tem so zaradi okrnjenosti nekateri podatki posameznih elementov prilagojeni pogojem pojava, opisanih v teoretičnem delu naloge. Na podlagi rezultatov smo prišli do ugotovitev, ki dejansko izpolnjujejo ustrezne pogoje za nastanek feroresonance. Power system consist of elements which operate in the linear range of operation, even though they are nonlinear. The non-linearity in the system most often represent transformers due to its own magnetic saturation. The network is due to nonlinearities occurring harmonics. The network element comes to the flow of magnetization, which is growing rapidly and contains higher harmonics. Higher harmonics and rapid flow also mean a higher voltage. A typical example, which is generated due to saturation of the elements and cause overvoltages is ferroresonance. Ferroresonance is a complex and complicated phenomenon, but due to its unique impact on the network, interesting to study and analyze. It occurs in the presence of non-linear inductance and capacitance, which is absolutely necessary to be in a certain ratio. In the first part of the diploma thesis the conditions, which are necessary for the emergence of the ferroresonance phenomenon and for sharing the phenomenon on parallel and serial ferroresonance, are described in detail. The first part of a thesis also describes the parameters of the components and initial conditions of the system which affects the actual phenomenon. Ferroresonance recognize the type fluctuations, which is characterized by four different shapes of oscillation modes. These are fundamental, subharmonic, quasi-periodic and chaotic shape. The consequences of the ferroresonance phenomenon can be catastrophic, as these lead to various failures, internal equipment of the system is in danger and the staff as well. Therefore, the phenomenon should be understood, recognized in certain situations and prevented or limited. The various methods are used which restrict or completely eliminate the phenomenon. For this purpose are used computer simulation methods, for example, a method of the spectral density, Poincaré map, phase plane etc, which by means of simulation programs provide a solution and the necessary data for a corresponding appropriate protection of the system. In the second part of the thesis a simulation of the ferroresonance phenomenon on the real network in the area of integrated economic complex (ZGK) Ravne was conducted. For the previously mentioned simulation the computer simulation program PSCAD (Power System Computer Aided Design) was used. The network consists of key elements, necessary for the formation of ferroresonance. These elements are underground cable line, a voltage transofrmer (VT) and the voltage source. The simulation is based on the graphic display of (over)voltages and currents in the individual elements of the fundamental frequency. The solutions are analyzed in a three-phase circuit, in which the ferroresonance occurred. With certain parameters are researched basic features of ferroresonance phenomenon. In this context, due to missing, certain data of individual elements are customized to the occurrence of the condition, described in the theoretical part of a diploma thesis. Based on the results we came to the conclusion, which actually comply the relevant conditions for the emergence of ferroresonance. feroresonanca resonanca nelinearna induktivnost kapacitivnost podzemnega kabelskega voda (KV) oblike nihajnih načinov obrat faze prenapetosti visoki tokovi simulacijsko vezje napetostni transformator (NT) ferroresonance resonance nonlinear inductance capacitance of underground cable types of oscillation modes turn phase overvoltage overcurrents circuit simulation voltage transformer (VT) true false false Slovenski jezik Angleški jezik Diplomsko delo 2016-09-15 14:50:01 2016-09-15 14:50:09 2022-08-09 08:56:07 0000-00-00 00:00:00 2016 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 34342 Bicanin_Darko_-_Pojav_feroresonance_v_elektricnem_omrezju_industrijskega_porabnika.pdf Bicanin_Darko_-_Pojav_feroresonance_v_elektricnem_omrezju_industrijskega_porabnika.pdf 1 0CE547C5BE867CBDED6A59CB9B924A8F 7b4f64855eb6b54910b121e21c4021bd342ee97785b6cac5fb9222781ed19c65 fb960596-a1b0-11eb-a523-00155dcfd717 20.500.12556/rul/885d4173-24aa-46f4-aa93-c01238096eb0 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=88614 Fakulteta za elektrotehniko 0 0 0