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Investigation of the Application of Energy Storage Systems in Energy Complexes with Renewable Energy Sources

This paper presents mathematical model of electrochemical energy storage. The model was implemented in the MATLAB Simscape. A model optimization method was proposed by changing its internal structure. Optimization made it possible to take into account the change in the internal resistance of the battery during the discharge process and significantly increased the simulation accuracy. The conclusion about the simulation accuracy is made on the basis of a comparison of the simulated discharge curves with the experimental curves that were obtained by research of a lead-acid battery as a part of a laboratory complex. An analysis of the applicability of the proposed mathematical model was carried out, in which various methods for calculating the battery mode are compared. The use of the proposed mathematical model of the battery is reasonable. Further development and optimization of this model will make it possible to use it for calculating the operating modes of electrochemical energy storage units in real electric power complexes.