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BELIČ, E., DEŽAN, K., LUKAČ, N., ŠTUMBERGER, G.
EVALUATION OF ENERGY SAVINGS ACHIEVED WITH OPTIMUM PHOTOVOLTAIC SYSTEMS REACTIVE POWER GENERATION IN LOW VOLTAGE DISTRIBUTION NETWORK
KOMUNALNA ENERGETIKA / POWER ENGINERING, 32
This paper deals with the evaluation of energy savings that can be achieved in low voltage distribution network by photovoltaic systems (PVS) reactive power generation according to the network needs. Whole analysis is done on the model of real low voltage distribution network, where two 50 kWp PVS are installed. For evaluation of energy savings, time frame of one year is considered. Active powers of PVS are determined on the basis of average measured solar irradiance in half hour intervals and loads active powers on the basis of load profile. Since installed photovoltaic systems are relatively large, the analysis is also performed for smaller PVS with rated power of 5 kWp. The presented results shows, that energy savings can be achieved with existing PVS when they generate optimal reactive power. However, savings can be even improved if instead of big, smaller PVS are installed at sites where consumption is present.
DEŽELAK, K., KOTNIK, S., DEŽAN, K., BELIČ, E., IVANECKÝ, J., ŠTUMBERGER, G.
ACCEPTANCE INDICATORS OF A MICRO HYDRO POWER PLANT INVESTMENT FOR A MICRO HYDRO POWER PLANT "KOTNIK"
KOMUNALNA ENERGETIKA / POWER ENGINERING, 5
This paper deals with the impact of the energy cost, produced by a micro hydro power plant, on the acceptance indicators of a micro hydro power plant investment. The aforementioned acceptance indicators are the net present value and the internal rate of return. All calculations are performed for a micro hydro power plant "Kotnik" with power of 10 kW, where technical and essentially financial parts are observed.
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.
DEŽELAK, K., DEŽAN, K., DEŽELAK, D., BELIČ, E., ŠTUMBERGER, G.
INTERNAL RATE OF RETURN FOR A SOLAR POWER PLANT IN CASE OF MOVABLE PHOTOVOLTAIC MODULS
KOMUNALNA ENERGETIKA / POWER ENGINERING, 8
In proposed paper the internal rate of return for a solar power plant investment is mainly dealt. The main parts of the solar power plant are represented by the photovoltaic moduls, which could be static or movable. In case of movable photovoltaic moduls, where moduls are following to the movement of the sun, the amount of the produced energy could be even up to 30 % higher than in case of static photovoltaic moduls. On the other hand an investment in movable solar plant leads to the higher initial costs of the whole investment.
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