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Primerjava napetostnih razmer v nizkonapetostnem omrežju pred in po vključitvi male sončne elektrarne
KUHAR, JAN (Author), Čepin, Marko (Mentor) More about this mentor... This link opens in a new window

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Abstract
Povpraševanje po električni energiji raste iz leta v leto, kar za sabo prinese tudi vse večjo porabo električne energije. Eden najpomembnejših pogojev, da bi uporabniki prejeli električno energijo, je pravilno načrtovano distribucijsko omrežje. Diplomska naloga je sestavljena iz teoretičnega in praktičnega dela. Na začetku je razloženo projektiranje distribucijskega omrežja. Poglavje vsebuje kriterije projektiranja srednjenapetostnega in nizkonapetostnega omrežja. Predstavljeni so tehnični kriteriji za srednjenapetostno in nizkonapetostno omrežje. Kriteriji, predstavljeni pri srednjenapetostnih omrežjih, so kriteriji ocenjevanja zanesljivosti napajanja uporabnikov, kriteriji tehničnega vrednotenja (dopustne obremenitve, dopustni padci napetosti, obremenjevanje transformatorja) in kriteriji ekonomskega vrednotenja. Pri predstavitvi nizkonapetostnih omrežij pa so zajeti mejni padci napetosti, referenčne impedance in dimenzioniranje transformatorja. Sledi poglavje analize omrežja. Za začetek je predstavljen model elektroenergetskega sistema, ta zajema model voda, model transformatorja, model bremena in model generatorja. Vsak primer je opisan z besedami, formulami in sliko. Analize omrežja ne moremo opraviti brez iteracijskih metod. Predstavljene so Gaussova metoda, Gauss-Saidlova metoda, Newton-Raphsonova metoda, razklopljena in hitro razklopljena metoda. Najprimernejša metoda pri analizi v distribucijskem omrežju je Newton-Raphsonova metoda. V nadaljevanju sledi predstavitev programskega paketa Gredos in PISELJ. Oba programska paketa sta nepogrešljiva pri analiziranju in načrtovanju distribucijskega omrežja. Na koncu je predstavljen primer napetostnih razmer v nizkonapetostnem omrežju pred in po vključitvi male sončne elektrarne na omrežje. Za začetek je predstavljeno nekaj splošnih podatkov o malih sončnih elektrarnah, primerjava izdanih soglasij za proizvodnjo in število priključenih samooskrb, predstavljen je vpliv priključitve male sončne elektrarne na nizkonapetostno omrežje in predstavljen je potek izdaje soglasja za priključitev male sončne elektrarne. V nadaljevanju je predstavljen izbrani primer. Predstavljeno je obravnavano omrežje in predstavljeni so rezultati meritev pred in po vključitvi male sončne elektrarne na omrežje. Zadnji del diplomske nalogo pa vsebuje samo analizo napetostnih razmer pri obravnavanem uporabniku. Predstavljena je analiza Elektra Ljubljana pred vključitvijo male sončne elektrarne na omrežje, predstavljeni so podatki o spremljanju temperature in moči sončnega obsevanja ter analiza maksimalnih in minimalnih napetosti na tedenski bazi. Prestavljena sta primera obratovanja male sončne elektrarne v sončnem in oblačnem vremenu ter kakšen je vpliv delovanja na maksimalne in minimalne napetostne razmere pri uporabniku.

Language:Slovenian
Keywords:Projektiranje distribucijskega omrežja, analiza omrežja, programska paketa Gredos in PISELJ, male sončne elektrarne (mFE)
Work type:Bachelor thesis/paper (mb11)
Organization:FE - Faculty of Electrical Engineering
Year:2020
Views:205
Downloads:123
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Secondary language

Language:English
Title:Comparison of voltage conditions in a low voltage network before and after the connection of a small solar power plant
Abstract:
Demand for electric energy is growing from year to year, which brings higher electricity consumption as well. One of the most important conditions for electricity consumption is a properly planned distribution network. The thesis consists of theoretical and practical part. The design of the distribution network is explained in the first part. The chapter contains the criteria for designing a medium voltage and low voltage network. Technical criteria for medium voltage and low voltage network are presented. The criteria presented in the medium voltage network include the criteria for assessing the power system reliability, the technical evaluation criteria (acceptable load, permissible voltage drops, transformer load) and the economic evaluation criteria. The presentation of low voltage networks includes limit voltage drops, reference impedances and transformer dimensioning. The section on network analysis follows. At the beginning of this thesis, a model of the power system is presented, which includes a line model, a transformer model, a load model and a generator model. Each example is described with words, formulas and a figure. Network analysis cannot be performed without iterative methods. Gauss, Gauss-Seidl, decoupled and fast decoupled methods are presented. The most suitable method for analysis in the distribution network is Newton-Raphson’s method. The presentation of Gredos and PISELJ software package follows. Both software packages are indispensable in the analysis and planning of the distribution network. Finally, an example of voltage conditions in a low voltage network before and after the connection of a small solar power plant to the network is presented. At the beginning, general data on small solar power plants, a comparison of issued consents for production and the number of connected small solar power plants are presented. The impact of connecting a small solar power plant to the low voltage network is presented together with the process of issuing consent for the connection of a small solar power plant to the network. The selected example is presented in addition. The considered network is presented together with the results of measurements before and after the connection of a small solar power plant to the network. The last part of the thesis contains an analysis of the voltage conditions of the example case. The analysis of Elektro Ljubljana before the connection of a small solar power plant to the grid, the data on monitoring the temperature and power of solar radiation and the analysis of maximum and minimum voltages on a weekly basis are presented. Examples of operation of a small solar power plant in sunny and cloudy weather and the impact of operation on the maximum and minimum voltage conditions are presented.

Keywords:Distribution network planning, network analysis, Gredos and PISELJ software packages, small solar power plants

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