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VOVČKO, B., VOVČKO, B., ŠTRICELJ, A., SEME, S.
MATHEMATICAL MODEL OF SOLAR CELL COMPOSED IN MATLAB/SIMULINK
KOMUNALNA ENERGETIKA / POWER ENGINERING, 30
This article presents a mathematical model of solar cell composed in Matlab/Simulink. Mathematical models of solar cell presented in the article are differ in the complexity of the structure and consequently the accuracy of the responses to the input parameters and they are named as ideal, simple, single-diode and two-diode model. In Matlab/Simulink are mathematical models of solar cell assembled with the help of terms, which describe the operation of solar cell. We compared mathematical models of solar cell with each other and we were evaluated them by comparing with the measured values of the actual solar cell.
VOVČKO, B., VOVČKO, B., ŠTRICELJ, A., SEME, S.
MATHEMATICAL MODEL OF SOLAR POWER PLANT BRESTANICA
KOMUNALNA ENERGETIKA / POWER ENGINERING, 31
This article presents a mathematical model of solar power plant composed of Matlab/Simulink. For the evaluation of simulation results of the mathematical model of the solar power plant we use the results of measurements from the actual solar power plant Termoelektrarna Brestanica d. o. o. We evaluate the results of simulation calculations and measurements of the actual plant for different days of the year. The results show good correlation between calculated and measured values of solar power, which is a good basis for further use of mathematical model of solar power for the analysis of voltage profiles of the network.
SEME, S., DEŽAN, K., ŠTUMBERGER, G.
ECONOMIC PARAMETERS OF PHOTOVOLTAIC SYSTEMS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 6
This work deals with economic parameters of photovoltaic systems. Economic parameters are important for the calculation of the investment in the photovoltaic systems. The parameters for the calculation of the technical and financial evaluations of the investment are presented. The technical calculation is affected by parameters, such as, manner, position, size of the system, the materials of the modules, inverters and electric energy produced by the photovoltaic system. For evaluating the investment technical and financial calculations are important. It is necessary to assess the initial investment costs, annual maintenance and operational costs, and also the redemption price of electric energy. The evaluation of investment costs and consequently income from electric energy sales are required for understanding the basics of the economics of photovoltaic systems.
ŽELEZNIK, D., SEME, S., TRUČL, P., VORŠIČ, J.
COMPARISON BETWEEN THE MATHEMATICAL CALCULATION OF SHADING AND ELECTRONIC SHADING MEASUREMENT FOR SOLAR POWER PLANT
KOMUNALNA ENERGETIKA / POWER ENGINERING, 7
Harnessing the Sun has lately become increasingly frequent. The Sun, the eternal nuclear reactor, is practically an inexhaustible source of energy. It is clear source, which can assure us an important part of energy for our needs. Therefore the goal has to be to harness this energy to the maximal possible extent; especially we have to use the roofs of already constructed buildings. There are many objects, on which we could build a solar power plant, but not all of them are suitable. There are numerous cases where certain locations do not receive solar radiation due to obstacles, even after more autumn or winter months all the duration of the solar radiation is significantly reduced. The amount of solar energy therefore depends on the season and location.
This paper presents the design of solar power plants and pitfalls which should be considered in planning. Shading is present almost everywhere, whether they are individual objects or just grassland where shading may cause horizon himself or surrounding obstacles, for example, trees. The impact of shading, it is necessary carefully to be considered in locations where there are grouped objects side by side – in the cities.
The article presents a simulation of shading for certain position of roof of a building, which is located in the agglomeration (city). It is made a comparison between the mathematical calculation of shading and electronic shading measurement on the roof of the building.
SEME, S., ŠTUMBERGER, G.
EFFICIENCY OF SILICON SOLAR MODULES AT DIFFERENT CLIMATIC CONDITIONS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 7
This paper deals with the impact of different climatic conditions on the efficiency of silicon solar modules. The mono-crystalline, the poly-crystalline and the amorphous silicon solar modules are compared. According to the measurements of IU characteristic of the solar module and solar radiation, the efficiency of individual silicon solar modules has been determined. It is shown that the efficiency as a function of different climatic conditions for a silicon solar modules varies considerably. Slowly increasing efficiency characteristic as a function of intensity of solar radiation is shown in amorphous silicon solar modules, while the poly-crystalline and mono-crystalline silicon solar modules, this characteristic is flat.
LUKAČ, N., ŽLAUS, D., SEME, S., ŽALIK, B., ŠTUMBERGER, G.
METHOD FOR ESTIMATING ROOFS SOLAR POTENTIAL CALCULATED ON LIDAR DATA
KOMUNALNA ENERGETIKA / POWER ENGINERING, 23
Buildings' roofs are becoming increasingly important for photovoltaic systems installation. They can increase efficiency of electrical usage and decrease the amount of greenhouse emissions. However, not all roofs are suitable for photovoltaic systems installation. This work proposes a method for estimating roofs’ solar potential. The solar potential is calculated on LiDAR data using measurements of direct and diffuse solar irradiance from pyranometer at a given location. Multiresolutional shadowing is proposed for achieving higher accuracy in the solar potential calculation.
SEME, S., ORGULAN, A., VORŠIČ, J.
AN OVERVIEW OF THE TECHNOLOGIES AND DEVICES FOR ENERGY STORAGE SYSTEMS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 2
The growing need for energy on the one hand and the growing desire for integrating the units for production from renewable sources, on the other hand, inspired the development of energy storage systems. Electric energy production from renewable sources such as solar and wind, primarily depends on the current conditions and there is no possibility of the production in stock. Therefore, the abovementioned sources require the reserve in conventional sources or appropriate energy storage systems. An overview of the technologies and devices for energy storage systems that are most promising nowadays will be presented in this work.
SEME, S., ŠTUMBERGER, G., VORŠIČ, J., TOMAŽIČ, A.
MEASUREMENT OF THE U-I CHARACTERISTICS OF PHOTOVOLTAIC MODULES
KOMUNALNA ENERGETIKA / POWER ENGINERING, 11
This paper deals with measurement of the U-I characteristics of photovoltaic modules. Measurements of the U-I characteristics of photovoltaic modules are defined in standards developed by the Technical Committee IEC TC 82. Unfortunately, we do not have equipment required to perform measurements of U-I characteristics of photovoltaic modules in accordance with the standard. Therefore, a comparative analysis of U-I characteristics measured on different modules under the same technical and weather conditions is performed. The results are given for the photovoltaic modules made of monocrystalline silicon, polycrystalline silicon and amorphous silicon.
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