The proper operation of aged batteries is essential to improve the reliability and performance of grid-connected battery energy storage systems (BESS). In this letter, we investigate on the phenomenon that removing certain battery cells within an aged battery pack, may lead to increasing the effective capacity of the BESS, because those cells with reduced capacity become the limiting factor for the overall BESS operation, while the remaining capacity of some other cells is not used. We optimize the process of identifying which battery cells from a grid-tied BESS should be removed in order to improve the overall BESS performance for smart grid applications. The experimental hardware-in-the-loop (HIL) testing of a grid-integrated BESS with aged cells is used to validate the developed models and show the increase in the effective capacity once the identified cells are removed. We also perform case studies to assess the impact of cell removal on the operation of an aged BESS in a peak demand shaving smart grid application.

中文翻译：

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优化电池去除以增强老化并网电池存储系统的运行


老化电池的正确运行对于提高并网电池储能系统（BESS）的可靠性和性能至关重要。在这封信中，我们研究了这样一种现象：移除老化电池组中的某些电池单元可能会导致 BESS 的有效容量增加，因为那些容量减少的电池单元成为整个 BESS 运行的限制因素，而其余的电池单元则成为整个 BESS 运行的限制因素。一些其他电池的容量未被使用。我们优化了识别应从并网 BESS 中移除哪些电池的过程，以提高智能电网应用的整体 BESS 性能。对带有老化电池的电网集成 BESS 进行实验性硬件在环 (HIL) 测试，用于验证所开发的模型，并显示移除已识别电池后有效容量的增加。我们还进行案例研究，以评估在峰值需求调节智能电网应用中，电池移除对老化 BESS 运行的影响。