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arXiv 1710.04552eess.SYcs.SY
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通过更准确的电池和退化建模改进电网连接锂离子电池的最优控制

Improving optimal control of grid-connected lithium-ion batteries through more accurate battery and degradation modelling

University of Oxford(牛津大学);EnergyVille(能源城);VITO(弗拉芒技术研究所)

Jorn M. Reniers, Grietus Mulder, Sina Ober-Blobaum, David A. Howey

AI总结:

本文通过更精确的电池和退化模型,改进电网连接锂离子电池的最优控制,发现更准确的模型能显著提高收益并减少退化,证明简单模型可能低估商业案例。

摘要:

间歇性可再生能源发电的增加为电网连接储能提供了机会。电池提供显著灵活性,但目前成本较高。电池寿命是商业可行性关键因素,取决于使用情况,但大多数技术经济分析未考虑此因素。本文首次量化了电网连接电池的年度收益,包括现实物理动态和非线性电化学退化。三种日益现实的锂离子电池模型被提出,预测的退化与大规模实验退化数据集(Mat4Bat)进行比较。通过提高模型精度,RMS容量预测误差从11%降至5%。三种模型随后用于最优控制算法中,进行一年的价格套利,包括退化。结果表明,使用更现实的模型可大幅提高收益并减少退化。使用复杂模型估计的最佳利润比最简单模型提高了175%。这表明,在电网连接电池的技术经济评估中使用简单电池模型可能严重低估商业案例并导致错误结论。

英文摘要:

The increased deployment of intermittent renewable energy generators opens up opportunities for grid-connected energy storage. Batteries offer significant flexibility but are relatively expensive at present. Battery lifetime is a key factor in the business case, and it depends on usage, but most techno-economic analyses do not account for this. For the first time, this paper quantifies the annual benefits of grid-connected batteries including realistic physical dynamics and nonlinear electrochemical degradation. Three lithium-ion battery models of increasing realism are formulated, and the predicted degradation of each is compared with a large-scale experimental degradation data set (Mat4Bat). A respective improvement in RMS capacity prediction error from 11\% to 5\% is found by increasing the model accuracy. The three models are then used within an optimal control algorithm to perform price arbitrage over one year, including degradation. Results show that the revenue can be increased substantially while degradation can be reduced by using more realistic models. The estimated best case profit using a sophisticated model is a 175% improvement compared with the simplest model. This illustrates that using a simplistic battery model in a techno-economic assessment of grid-connected batteries might substantially underestimate the business case and lead to erroneous conclusions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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