152 research outputs found
Ugotavljanje izvorov upadov napetosti : diplomska naloga univerzitetnega študijskega programa
No full textOptimal sun-tracking of a photovoltaic system considering the electric drive losses
No full textDoktorska disertacija obravnava optimalno sledenje fotonapetostnega sistema soncu, pri čemer upoštevamo električne izgube pogonskega sklopa. Sledenje fotonapetostnega sistema soncu omogoča, da pri tem na sončne module pade čim več razpoložljive energije sončnega sevanja. Pogonski sklop, ki omogoča sledenje, predstavlja za fotonapetostni sistem porabo električne energije. Idealni izplen pretvorbe razpoložljive energije sončnega sevanja bi bil dosežen ob zveznem sledenju sledilnega sistema poti sonca. Ker imajo pogonski sklopi konstantno hitrost in diskreten način sledenja, se lahko idealnemu izplenu energije sončnega sevanja le približajo.
V doktorski disertaciji je predstavljeno, kako diskretno slediti poti sonca, da na sončne module pade čim več razpoložljive energije sončnega sevanja, pri čemer so upoštevane električne izgube pogonskega sklopa. Za dosego želenega cilja so potrebne čim bolj natančne vrednosti o razpoložljivi energiji sončnega sevanja pri tleh v danem trenutku. Zato je v okviru doktorske disertacije razvit model za napoved celotnega in difuznega sončnega sevanja v obliki časovno odvisne funkcije za jasne dni. Model je potrjen s primerjavo med izmerjenim in napovedanim sončnim sevanjem za jasne dni. Napoved sončnega sevanja v obliki časovno odvisne funkcije in izgube pogonskih sklopov, kot funkcije naklona in azimuta, so uporabljeni za določitev optimalnih trajektorij sledilnega sistema. Za iskanje rešitve nelinearnega in omejenega problema je uporabljena stohastična metoda, imenovana Diferenčna evolucija. Tovrstni pristop za iskanje maksimalnega izplena fotonapetostnega sistema še ni bil raziskan v nobeni literaturi. Uporablja se točno določena kriterijska funkcija, ki je minimalna v optimizacijskem postopku glede na optimizacijske meje. S tem je zagotovljena največja možna pretvorba energije sončnega sevanja, upoštevajoč uporabljen model fotonapetostnega sistema, porabe sledilnega sistema, napovedi sončnega sevanja in lastnosti optimizacijskega postopka. Uporaba drugačnih in bolj naprednih modelov fotonapetostnega sistema, porabe sledilnega sistema ali napovedi sončnega sevanja lahko privede tudi do drugačnih optimalnih trajektorij sledilnega sistema. Vendar to nikakor ne zmanjša teže predlagane metode. Predlagana metoda daje maksimalni izplen fotonapetostnega sistema za uporabljene modele in podatke.Doctoral thesis deals with optimal sun-tracking of a photovoltaic system considering the electric drive losses. The Sun tracking PV system assures that the highest possible share of the available solar radiation reaches the surface of the PV modules. The electric drive which enables tracking is considered as the loss of the energy produced in the PV system. The maximum of the energy produced in the PV system is achieved by the continuous tracking of the PV system. Since the electric drives are determined by constant speed and time, and angle quantization the maximum of the energy produced can only approximate.
The doctoral thesis presents a new method for determining such trajectories of the PV modules that change the position of the PV modules in such a way that the production of the electric energy in the given time interval of the observation reaches its maximum. The goal is to determine the maximum efficiency of the PV tracking system considering the tracking system energy consumption. To achieve this, exact values of the available solar energy are needed for a given moment. To do this, a new method for predicting direct and diffuse solar radiation on the Earth’s surface, in the form of the time dependent function, is developed. The method is confirmed by the comparison of the measured and the predicted solar radiation for clear days. The developed method for predicting the solar radiation in the form of the time dependent function and energy consumption of the tracking system, given as the functions of the azimuth and tilt angle change, are applied together to determine those trajectories of the PV module, where the PV system energy production, gives the maximum. To find a solution of the nonlinear and bounded optimization problem, a stochastic search algorithm called Differential Evolution is applied. The approach for determining the maximum of the energy produced in the PV system has not been researched yet. The explicitly defined objective function, which is minimized in the optimization procedure considering the optimization bounds, is used. Thus it is assured the maximum of the possible energy produced in the PV system, considering the applied model of the PV system, tracking system consumption, predicted solar radiation, and the properties of the applied optimization method. The use of the different and more advanced models of the PV system, the sun tracking system consumption or prediction of the solar radiation, can lead to the different optimal trajectories of the sun tracking system. However, this cannot reduce the importance of the proposed method. The proposed method gives the maximum of the possible energy produced in the discussed PV system, considering the applied models and data
Določitev parametra magnetno nelinearnega modela transformatorja : diplomska naloga visokošolskega strokovnega študijskega programa
No full textDetermination of shading of photovoltaic systems with the SketchUp
No full textV diplomskem delu so obravnavani energija sonca kot ena najpomembnejših vrst obnovljivih
virov energije, solarni paneli in vrste soncnih celic. Predstavljen je model zgradbe
Medpodjetniškega izobraževalnega centra Velenje z dejanskim položajem solarnih panelov.
Delo je potekalo s program SketchUp kot enim najenostavnejših programov za 3D
modeliranje, s pomocjo katerega so bile dolocene sence fotonapetostnih sistemov.
Predstavljen je vzrok sence in njena povezanost z dolocenim datumom, dnevnim casom in
geografskim položajem.In diploma work was presented solar energy as one of the most important types of renewable
energy. Solar panels and types of solar cells. I presented a model of MIC with the real
positions of solar panels. Program Sketchup as one very simple program for 3D modeling.
The influence of shadows and their connection with certain date, time and geographical
location
Measurement device for testing assembled printed circuit boards from manufacturing lines
No full textDiplomsko delo predstavi efektiven način za oceno in določitev kakovosti tiskanih vezij iz proizvodnih linij. Sestavljeno tiskano vezje zagotavlja električno povezavo prispojenim elektronskim komponentam. Po sestavi tiskanega vezja je potrebno izvesti funkcionalen preizkus, ki zagotavlja kakovost izdelka. Po navadi so proizvodnje linije opremljene z inšpekcijskimi kamerami, ki odkrivajo nepravilnosti, kot so manjkajoče komponente. Takšno zagotavljanje kakovosti v nekaterih primerih ni dovolj, zato moramo dodati dodatno raven nadzora. Poleg inšpekcij s kamerami morajo biti opravljene električne meritve. Proces meritev mora biti avtomatiziran, da se zagotavljata ponovljivost in hitrejša izvedbo procesa. Diplomsko delo ovrednoti pomen takšne naprave, predstavi njene prednosti in slabosti ter njeno kompleksnost. Naprava obsega elektronski del, ki izvaja meritve, mehanski del, ki obsega ohišje in vpenjalno mesto, ter program, ki nadzira proces.The diploma thesis presents an efficient way to evaluate and determent the quality of an assembled printed circuit board from manufacturing lines. An assembled PCB consists of electronic devices that are soldered to the PCB that provide electrical connection. After assembling the PCB, a function test needs to be performed to guaranty the quality of the product. Usually, the assembly lines are mounted with cameras that detect inaccuracies such as missing component. This type of quality assurance is sometimes not enough, and we need to add another degree of precautions. In addition of camera inspections, electronic measurements need to be made conducted. The process needs to be automatized to provide repeatability and speed. The diploma evaluates such a device, presents its advantages and disadvantages and its complexity. The device covers an electrical part that preforms the measurements, a mechanical part that consists of a housing and a mounting nest and a program that supervises the process
Low voltage network model and analysis of integration of heat pumps, solar power plants and energy storage systems
No full textMagistrsko delo analizira vključevanje toplotnih črpalk, sončnih elektrarn in hranilnikov električne energije v nizkonapetostno omrežje. Analiza je izvedena s simulacijami obratovalnih stanj, ki so lahko za omrežje težavna. Kot okolje za simulacije je bil uporabljen model nizkonapetostnega omrežja Brezje, izdelan s programskim orodjem Matlab Simulink. Izdelana simulacijska metoda omogoča določitev največjega števila toplotnih črpalk in sončnih elektrarn, ki ga omrežje v svojem trenutnem stanju lahko sprejme. Kriterij za sprejem vključitve nove naprave v omrežje je amplituda napetosti. Rezultati zajemajo tudi analizo vpliva novo dodanih naprav na celodnevni potek napetosti. Dodatno je raziskan vpliv hranilnikov električne energije. Hranilniki električne energije izboljšajo časovno usklajenost proizvodnje in porabe električne energije, kar ima pozitiven učinek na stanje napetosti v omrežju.The master\u27s thesis analyses the integration of heat pumps, solar power plants, and electric energy storage systems into a low voltage network. The analysis is conducted through simulations of operational states that can pose challenges for the network. The simulation environment used is a low voltage network model called Brezje, created using the Matlab Simulink software tool. The developed simulation method enables the determination of the maximum number of heat pumps and solar power plants that the network can accommodate in its current state. The acceptance criterion for the integration of a new device into the network is voltage amplitude. The results also encompass an analysis of the impact of newly added devices on the daily voltage profile. Additionally, the influence of electric energy storage systems is explored. These systems enhance the temporal alignment of electricity production and consumption, which positively affects the voltage condition within the network
FROM BLOC 5 THERMAL POWER PLANT ŠOŠTANJ TO DISTRIBUTION TRANSFORMER STATION PODLOG
No full textDelo obravnava dinamični model elektroenergetskega sistema (EES) od bloka 5 Termoelektrarne Šoštanj do RTP Podlog. Podana je primerjava med realnimi in idealnimi modeli posameznih elementov EES. Rezultati kažejo, da je uporaba idealnih elementov v dinamičnem modelu EES smiselna. V programskem paketu MatLAB / Simulink je z modulom Powersys sestavljen model EES od bloka 5 do RTP Podlog. Izvedena je analiza delovanja modela ob okvarah, kot sta vklop obremenjenega sistema in trifazni kratki stik. Opravljena je primerjava simulacijskih rezultatov iz dinamičnega modela EES z meritvami opravljenimi na realnem sistemu bloka 5. Rezultati kažejo, da se z dinamičnim modelom lahko približamo realnemu sistemu EES.This work deals with a dynamic model of an electric power system (EPS) from the unit 5 of the Šoštanj Thermal Power Plant (ŠTPP) to the distribution transformer station (DTS) Podlog. A comparison between real and ideal models of individual elements of EPS has been made. The results show that ideal models can be used in the dynamic model of a complete EPS. The dynamic model of EPS from the unit 5 ŠTPP to DTS Podlog was built in the program package MatLAB / Simulink, using module Powersys. An analysis of the dynamic model operation during failures, such as power loaded system and three phase short circuit, has been presented as well. Furthermore, a comparison between simulation results from the dynamic model of the EPS and the measurements measured on the real system of the unit 5 ŠTPP has been made. According to the results, the dynamic model can be drawn nearer to the real system of the EPS
Modeling and simulation of induction furnance
No full textCilj zaključnega dela je predstaviti alternativno možnost taljenja kovin brez škodljivih vplivov na okolje in preučiti princip delovanja ter pripraviti teoretično podlago za izdelavo matematičnega modela indukcijske peči. Na podlagi zaključnega dela lahko ugotovimo kako različni parametri komponent vplivajo na delovanje indukcijske peči in električnega vezja.The objectives of the thesis are to present an alternative possibility of melting metals without harmful effects on the environment and to study the principle of operation of the induction heater to prepare a theoretical basis for the application model. Based on the thesis, we can find out how different parameters affect the operation of the induction furnace and the electrical circui
Energy community with a solar power plant
No full textV diplomskem delu je obravnavan koncept energetske skupnosti s sončno elektrarno kot trajnosten model samooskrbe, spodbujanja energetske neodvisnosti in zmanjševanja negativnih vplivov na okolje. Pojasnjeni so osnovni pojmi, vrste skupnosti, njihove prednosti in slabosti ter primeri iz Slovenije. Obravnavana je povezava med nihanjem borznih cen električne energije, finančnimi prihranki sončne elektrarne in pregled slovenske zakonodajne podlage energetskih skupnosti. V nadaljevanju so pojasnjeni okoljski, ekonomski in družbeni vidiki ter glavni izzivi skupnosti. Raziskovalni del zajema samooskrbno skupnost v Budanjah s podrobno analizo prihrankov izbranega člana skupnosti in primerjavo glede na pričakovane prihranke.The thesis explores the concept of an energy community with a solar power plant as a sustainable model for self-sufficiency, promoting energy independence, and reducing negative environmental impacts. It explains the fundamental concepts, types of communities, their advantages and disadvantages, as well as examples from Slovenia. The thesis examines the relationship between fluctuations in market electricity prices, the financial savings generated by solar power, and provides an overview of the Slovenian legislative framework for energy communities. Furthermore, it elaborates on the environmental, economic, and social aspects, as well as the main challenges faced by such communities. The research part focuses on the self-sufficient community in Budanje, providing a detailed analysis of the savings achieved by a selected community member, compared to the expected savings
WATER POTENTIAL OF MONTENEGRO AND POSSIBILITY OF CONSTRUCTING A MICRO HYDRO ELECTRIC POWER PLANT ON THE STREAM OĐZAČKO VRELO
No full textV diplomski nalogi je predstavljen hidrometeorološki potencial Črne gore, izkoriščanje vodnih virov črnogorskih rek za proizvodnjo električne energije. Podrobneje je obravnavan severni del Črne gore, majhni vodotoki na področju občine Pljevlja. Poseben poudarek je na potoku Ođzačko vrelo. Na podlagi meritev pretoka na vodotoku Ođzačko vrelo je načrtovana mala hidroelektrarna. Poleg samega načrtovanja majhne hidroelektrarne so opisani tudi pogoji za izgradnjo tovrstnih hidroelektrarn v Črni gori in možnosti sofinanciranja proizvodnje električne energije z obnovljivimi viri. Del diplomske naloge je namenjen tako ekološkim predpisom kot tudi analizi ekonomske upravičenosti izgradnje male hidroelektrarne Ođzačko vrelo.In this diploma thesis, I have presented the hydro meteorological potential of Montenegro, exploitation of water resources of Montenegrin rivers to produce electricity. The northern parts of Montenegro as well as small streams in the municipality of Pljevlja are discussed in detailhowever, the main focus lies on the stream Ođzačko vrelo. Based on the flow measurements in the stream Ođzačko vrelo, a micro hydro electric power plant is planned. In addition to the planning, the construction conditions for micro hydro electric power plants in Montenegro are described as well as the possibilities of co-financing of power through renewable energy sources. A part of the diploma thesis deals with the ecological regulations as well as the economic viability analysis of the construction of the micro hydro electric power plant Ođzačko vrelo
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