The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Study on Estimation Method for Optimal Composition Rate of Hybrid ESS Using Lead-acid and Lithium-ion Batteries

연축전지와 리튬이온전지용 하이브리드 ESS의 최적구성방안에 관한 연구

  • Park, Soo-Young (Dept. of Electrical Engineering, Korea University of Technology & Education) ;
  • Ryu, Sang-Won (Dept. of Electrical Engineering, Korea University of Technology & Education) ;
  • Park, Jae-Bum (Dept. of Electrical Engineering, Korea University of Technology & Education) ;
  • Kim, Byung-Ki (Dept. of Electrical Engineering, Korea University of Technology & Education) ;
  • Kim, Mi-Young (Dept. of Electrical Engineering, Korea University of Technology & Education) ;
  • Rho, Dae-Seok (Dept. of Electrical Engineering, Korea University of Technology & Education)
  • Received : 2015.11.05
  • Accepted : 2016.04.12
  • Published : 2016.06.01
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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.

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References

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