ANALYSIS OF ELECTRIC ENERGY AND HYDROGEN ACCUMULATION EFFICIENCY IN POWER SYSTEMS WITH RENEWABLE ENERGY SOURCES

The PURPOSE of the paper is to study the power system which contains wind turbines, photoelectric transducers, an electrolyzer for hydrogen production, fuel cells in order to determine the efficiency of electrical energy and hydrogen accumulation. METHODS. Based on the mathematical modeling an optimal structure of the power system has been selected and the operation modes of energy sources and storage devices have been studied in dynamics. Unlike the approaches known in the literature, the mathematical model used does not require preliminary setting of the operation modes of the system elements or the algorithms for energy switching between energy sources, load and accumulators. This allows us to investigate complex power systems which simultaneously produce and accumulate energy carriers of various types, in our case these are electrical energy and hydrogen. RESULTS AND THEIR DISCUSSION. Climatic and meteorological conditions that approximately correspond to the conditions of the southern part of Primorsky Krai and the middle part of Lake Baikal are chosen as input data. Technical and economic indicators correspond to the domestic and foreign equipment presented in the Russian market. Calculations are carried out both with and without restrictions on the introduction of specific technologies for their effectiveness evaluation. CONCLUSIONS. Mathematical modeling has shown the efficiency of the combined use of wind and solar energy in the areas under consideration as well as simultaneous accumulation of both electric energy and hydrogen. Accumulation of electric energy is most effective during short-term time intervals (output of electric power for several hours). If the duration of continuous no-wind and no-sun conditions increases up to several days the accumulation of hydrogen becomes more economical. The economic effect provided by the accumulation of hydrogen can reach 50% of the total effect under technical and economic indicators of equipment predicted for the next 10-15 years. The obtained results allow to substantiate the choice of equipment for consumer power supply in stand-alone power systems of small capacity.

wind turbines (WT), photovoltaic transducers (PT), hydrogen, electrolyzer, fuel cells, energy accumulation, economic efficiency

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