Advanced Power Sharing Method to Improve the Energy Efficiency of Multiple Battery Energy Storages System

Jin-Young Choi,In-Sun Choi, Geon-Ho Ahn,Dong-Jun Won

IEEE Transactions on Smart Grid (TSG)（2016）SCI 1区

INHA Univ | OCI Co LTD | Hyosung Corp

Cited 42|Views13

Abstract

A large scale energy storage system has become increasingly attractive and has been applied to various ancillary services. To serve energy for a longer time and to increase the profit of a multiple energy storages system, it should be operated considering each available energy source and the different efficiencies of the subordinate storages. This paper proposes a hierarchical control structure and three types of the power sharing methods for a multiple battery energy storages system. A maximum efficiency optimization method based on a piecewise linearized Lagrangian equation is suggested. In addition, a usable energy sharing algorithm is proposed to distribute the output power evenly according to the available energy of each battery. To improve the system availability, a combination algorithm that selects the appropriate control according to the situation is also proposed. The improvement in energy efficiency of the proposed methods is verified with a duty cycle test of Pacific Northwest National Laboratory by PSCAD/EMTDC.

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Key words

Multiple battery energy storages system,power sharing method,energy efficiency,optimization

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