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Vpliv električnih vozil na nizkonapetostno distribucijsko omrežje
DUGULIN, LUKA (Author), Blažič, Boštjan (Mentor) More about this mentor... This link opens in a new window

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Abstract
Vključevanje električnih vozil v distribucijsko omrežje predstavlja dodaten in nepredvidljiv odjem za sistemskega operaterja. Velike konične moči polnilnic ob nenapovedanih polnjenjih električnih vozil vplivajo na stabilnost obratovanja elektroenergetskega sistema, zato je za omrežnega operaterja pomembno, da pravilno določi vpliv električnih vozil v sistemu. Cilj diplomskega dela je bil določitev vpliva električnih vozil na nizkonapetostna (NN) distribucijska omrežja in pripadajoče omrežne parametre. V diplomski nalogi so opisani elementi nizkonapetostnega omrežja in pripadajoči modeli v simulacijskih okoljih. Sem sodi tudi predstavitev različnih tipov električnih vozil, njihov način polnjenja in kako se ta lahko obnašajo kot bodisi aktivna bodisi pasivna bremena v električnem omrežju. Analiza vpliva implementacije električnih vozil se je izvedla na realističnem modelu nizkonapetostnega omrežja z realnimi letnimi podatki odjema za 27 hišnih odjemalcev električne energije. Uporabnikom se je v različnih scenarijih implementirala 7 kW polnilnica za polnjenje električnih vozil, ki je obratovala in polnila električna vozila v popoldanskem in večernem terminu. V drugem delu sta predstavljena scenarijski pristop in simulacijsko okolje za analizo vpliva električnih vozil na distribucijsko omrežje. Za analizo je bil izbran simulacijski interval enega tedna v poletnem terminu. Simulacije so se izvedle v programskih okoljih OpenDSS in MATLAB. Možnost interakcije med programoma omogoča natančnejši način analiziranja podatkov, hitrejšo in temeljitejšo analizo ter grafično predstavitev dobljenih rezultatov. Rezultati simulacij zajemajo pretoke moči skozi SN/NN transformator, napetostne razmere in izgube v nizkonapetostnem omrežju. Izkazalo se je, da imajo električna vozila velik vpliv na konične pretoke moči, ki so posledica nekoordiniranega režima polnjenja, povzročijo velike napetostne padce in posledično tudi večje izgube pri prenosu električne energije. Velika koncentracija električnih vozil bi lahko zahtevala vključitev večjega transformatorja, ki bi skrbel za stabilnejše obratovanje sistema.

Language:Slovenian
Keywords:električna vozila (EV), nizkonapetostno omrežje (NN), MATLAB, OpenDSS, konične moči
Work type:Bachelor thesis/paper (mb11)
Organization:FE - Faculty of Electrical Engineering
Year:2020
Views:245
Downloads:117
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Secondary language

Language:English
Title:Impact of electric vehicles on a low-voltage distribution network
Abstract:
The integration of the electric vehicles to the distribution network means an additional and unpredictable consumption for the system operator. High peak powers of the charging stations in case of unplanned charging affect the stability of power system operation, thus it is important that the influence of the electric vehicles is well defined. The aim of this thesis is to define the impact of the electric vehicles on low-voltage (LV) distribution networks and the associated network parameters. Furthermore, the elements of the low-voltage network and associated models in simulation environments are also described, as well as different types of electric vehicles, their charging methods and the way they may behave as either active or passive loads in a network. The impact analysis of the implementation of electric vehicles was carried out on a realistic model of a low-voltage network with real annual consumption data for 27 household electricity consumers. In different cases, a 7-kW electric vehicle charging station was implemented, which operated and charged electric vehicles in the afternoon and evening. The second part of this thesis presents a scenario approach and a simulation environment for analyzing the impact of electric vehicles on the distribution network. A simulation interval of one week in the summer term was selected for the analysis. The simulations were performed in OpenDSS and MATLAB software environments. The possibility of interaction between the programs provides a more precise way of analyzing the data, a faster and more thorough analysis, and a graphical representation of the results obtained. The simulation results capture power flows through the SN / NN transformer, voltage conditions, and losses in the low-voltage network. Electric vehicles have shown to have a major impact on peak power flows resulting from the uncoordinated charging regime. There are large voltage drops and, consequently, greater losses in electricity transmission. A high number of electric vehicles could require the inclusion of a larger transformer to ensure a more stable system operation.

Keywords:electric vehicles (EV), low-voltage network (LV), MATLAB, OpenDSS, peak powers

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