并联Buck稳压电池模块的集中递归优化调度
Centralized Recursive Optimal Scheduling of Parallel Buck Regulated Battery Modules
摘要：
针对由不同开路电压和电池阻抗特性的并联电池模块组成的电池系统，提出了一种集中递归优化进度安排法。这种电池系统的示例可以在二次使用、可更换或再利用的电池系统中找到，其中具有不同充电或老化特性的电池被组合以产生更大的存储容量。本文提出的方法利用电池管理系统（BMS）中降压调节器的可用性来计算各个模块的最佳电压调整，以最大限度地减少并联电池模块之间杂散电流的影响。我们提出的方法递归地计算最佳电流调度，平衡（等于）每个模块电流，并最大化总总线电流，而不违反任何电池模块的操作约束。递归实现保证了电池模块操作参数随着电池组充电（放电）或老化而改变时的稳健操作。为了验证该方法在实际电池系统中的性能，建立了3个并联电池模块的实验装置。实验结果验证了该方法的可行性，并显示了该进度安排法在实际电池应用中的优势，尽管每个模块可能具有不同的阻抗、开路电压和充电参数。
英文摘要：
This paper presents a centralized recursive optimal scheduling method for a battery system that consists of parallel connected battery modules with different open circuit voltages and battery impedance characteristics. Examples of such a battery system can be found in second-life, exchangeable or repurposed battery systems in which batteries with different charge or age characteristics are combined to create a larger storage capacity. The proposed method in this paper takes advantage of the availability of buck regulators in the battery management system (BMS) to compute the optimal voltage adjustment of the individual modules to minimize the effect of stray currents between the parallel connected battery modules. Our proposed method recursively computes the optimal current scheduling that balances (equals) each module current and maximize total bus current without violating any of the battery modules operating constraints. Recursive implementation guarantees robust operation as the battery modules operating parameters change as the battery pack (dis)charges or ages. In order to demonstrate the capability of this method in real battery system, an experimental setup of 3 parallel placed battery modules is built. The experimental results validate the feasibility and show the advantages of this current scheduling method in a real battery application, despite the fact that each module may have different impedance, open circuit voltage and charge parameters.
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