考虑梯次储能由不同健康状态的退役电池构成,基于梯次储能系统中电池组的荷电状态和健康状态提出一种功率分配优化策略。该策略计及不同健康状态电池组的寿命衰减对梯次储能系统寿命衰减的影响,基于电池组荷电状态和健康状态,考虑二者对电池组充放电能力影响的权重,通过对电池组充放电排序以实现最终的功率分配。首先,基于所构建梯次储能系统循环寿命衰减模型计算电池组的寿命衰减;然后,提出3种由电池组寿命衰减来计算梯次储能系统寿命衰减的计算方式,最后,以梯次储能系统寿命衰减最小为目标函数求解充放电排序策略中的权重值,实现不同电池组间的功率分配。在算例中通过与传统功率均分策略作比较,证明所提策略的优越性,并对所提的3种方式的优缺点进行对比分析。
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
关键词
电池储能 /
能量管理 /
生命周期 /
退役电池 /
梯次储能系统
Key words
battery energy storage /
energy management /
life cycle /
retired battery /
echelon energy storage system
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基金
国家自然科学基金青年项目（52207091）
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