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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.
KŘÍŽ, J., PISTORA, M., NOHÁČOVÁ, L., VELEBA, J.
POSSIBILITIES OF BLACK-START WITH USING RENEWABLE SOURCES ENERGY
KOMUNALNA ENERGETIKA / POWER ENGINERING, 16
The risk of a large loss of power supply (blackout) cannot be entirely excluded. Therefore the power grid has to be prepared for power restoration. One possibility of power supply restoration after blackout is a black-start of one energy source and starting up self-consumption of a larger power station.
Due to rapid increase in renewable energy sources installed power, many new large-enough power plants have been built in recent years. These power plants would be sufficient to power-up self-consumption of a larger power plant.
This paper evaluates the possibility of starting self-consumption of coal power plant Ledvice using wind farm Kryštofovy Hamry.
LACKO, R., DROBNIČ, B., MORI, M., SEKAVČNIK, M.
PLANNING OF A SELF-SUFFICIENT ENERGY SYSTEM WITH 100% RENEWABLE ENERGY SOURCES AND HYDROGEN STORAGE
KOMUNALNA ENERGETIKA / POWER ENGINERING, 17
A potential solution for stand-alone power generation is to use a hybrid energy systems with hydrogen energy storage. In this paper, a pre-feasibility study of using 100% renewable hybrid energy system (using solar and wind energy source) with hydrogen technologies (electroyser, hydrogen tank, fuel cell) for a reference household application in Portorož, Slovenia is explained. HOMER software tool is used for simulations and optimal energy system determination, where geographical location and availability of energy sources, load dynamics, component technical and economical characteristics were considered. A remote household with electricity consumption of 11 kWh/day with a 3,8 kW peak power demand was considered as the stand alone load. Results show the optimal feasible system with lowest total net present cost. It was found that almost a ten-fold (34 kW) renewable technology capacity is required to meet the demand.
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