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http://dx.doi.org/10.4313/JKEM.2018.31.1.61

Development of ESS Based on VRFB-LFPB Hybrid Batteries  

Cheon, Young Sik (Institute of R&D Center, KEPCO KPS)
Park, Jin Soo (Institute of R&D Center, KEPCO KPS)
You, Jinho (Department of Software Convergence Engineering, Mokpo National University)
Lee, Jin (Department of Electrical Engineering, Mokpo National University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.31, no.1, 2018 , pp. 61-67 More about this Journal
Abstract
High-power lithium batteries are suitable for equipment with high power output needs, such as for ESS's initial start-up. However, their management cost is increased by the installation of air-conditioning to minimize the risk of explosion due to internal temperature rise and also by a restriction on the number of charge/discharge cycles. High-capacity flow batteries, on the other hand, have many advantages. They can be used for over 20 years due to their low management costs, resulting from no risk of explosion and a high number of charge/discharge cycles. In this paper, we propose an ESS based on hybrid batteries that uses a lithium iron phosphate battery (LiFePO) at the initial startup and a vanadium redox flow battery (VRFB) from the end of the transient period, with a bi-directional PCS to operate two batteries with different DC voltage levels and using an efficient energy management control algorithm.
Keywords
ESS (energy storage system); BMS (battery management system); PMS (power management system); Vanadium redox flow battery (VRFB); Lithium iron phosphate battery ($LiFePO_4$);
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