OPTIMIZATION STRATEGY FOR POWER DISTRIBUTION IN ECHELON ENERGY STORAGE SYSTEMS CONSIDERING DECAY OF RETIRED BATTERY GROUPS LIFE

Fu Zhixin; Chen Li; Liu Haoming; Wang Jian; Yuan Yue

doi:10.19912/j.0254-0096.tynxb.2023-1654

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (2) : 70-77. DOI: 10.19912/j.0254-0096.tynxb.2023-1654

OPTIMIZATION STRATEGY FOR POWER DISTRIBUTION IN ECHELON ENERGY STORAGE SYSTEMS CONSIDERING DECAY OF RETIRED BATTERY GROUPS LIFE

Fu Zhixin, Chen Li, Liu Haoming, Wang Jian, Yuan Yue

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Abstract

Considering that echelon energy storage system is composed of retired batteries with varying health conditions, this study proposes an optimized power distribution strategy based on the state of charge and state of health of battery groups within the system. The strategy takes into account the influence of different health status battery groups on the overall lifespan degradation of the echelon energy storage system. It weighs the effects of both state of charge and state of health on the charging and discharging capabilities of battery groups, ultimately achieving power distribution through a ranking of battery group charging and discharging sequences. First, based on the constructed cycle life degradation model for the echelon energy storage system, we compute the life degradation of individual battery groups. Then, three methods are presented to estimate the life degradation of the echelon energy storage system based on the computed life degradation of its battery groups. At last, with the aim of minimizing the life degradation of the echelon energy storage system, the weight values within the charging and discharging ranking strategy are determined by solving an optimization problem, thus enabling power distribution among distinct battery groups. Example analysis demonstrate the superiority of the proposed strategy compared to traditional equal power sharing methods. Furthermore, a comparative

Key words

battery energy storage / energy management / life cycle / retired battery / echelon energy storage system

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Fu Zhixin, Chen Li, Liu Haoming, Wang Jian, Yuan Yue. OPTIMIZATION STRATEGY FOR POWER DISTRIBUTION IN ECHELON ENERGY STORAGE SYSTEMS CONSIDERING DECAY OF RETIRED BATTERY GROUPS LIFE[J]. Acta Energiae Solaris Sinica. 2025, 46(2): 70-77 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1654

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