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

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 differe...

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Bibliographic Details
Published inIEEE transactions on smart grid Vol. 9; no. 2; pp. 1292 - 1300
Main Authors Choi, Jin-Young, Choi, In-Sun, Ahn, Geon-Ho, Won, Dong-Jun
Format Journal Article
LanguageEnglish
Published IEEE 01.03.2018
Subjects
Algorithm design and analysis
Batteries
Energy efficiency
Inverters
Multiple battery energy storages system
optimization
Power generation
power sharing method
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Summary: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.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2016.2582842