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http://dx.doi.org/10.18770/KEPCO.2016.02.01.049

A Study on Optimal Configuration Method of Hybrid ESS using Lead-acid and Lithium-ion Batteries for Supply of Variation Loads  

Rho, Dea-seok (Korea University of Technology and Education)
Choi, Seong-sik (Korea University of Technology and Education)
Lee, Hu-dong (Korea University of Technology and Education)
Chang, Byunh-hoon (KEPCO Research Institute, Korea Electric Power Corporation)
Kim, Su-yeol (KEPCO Research Institute, Korea Electric Power Corporation)
Publication Information
KEPCO Journal on Electric Power and Energy / v.2, no.1, 2016 , pp. 49-54 More about this Journal
Abstract
The large scaled lead-acid battery is widely used for efficient operation of the photovoltaic system in many islands. However, lithium-ion battery is now being introduced to mitigate the fluctuation of wind power and to replace lead-acid battery. Therefore, hybrid ESS (Energy Storage system) that combines lithium-ion battery with lead-acid battery is being required because lithium-ion battery is costly in present stage. Under this circumstance, this paper presents the optimal algorithm to create composition rate of hybrid ESS by considering fixed and variable costs in order to maximize advantage of each battery. With minimization of total cost including fixed and variable costs, the optimal composition rate can be calculated based on the various scenarios such as load variation, life cycle and cost trend. From simulation results, it is confirmed that the proposed algorithms are an effective tool to produce a optimal composition rate.
Keywords
Hybrid ESS; lead-acid battery; lithium-ion battery; optimal composition rate; load variation type; fixed cost; variable cost;
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