On the value of liquid-air and pumped-thermal electricity storage systems in low-carbon electricity systems
On the value of liquid-air and pumped-thermal electricity storage systems in low-carbon electricity systems
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DOI：
10.1016/j.energy.2019.116680
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发表时间：
2020-02
期刊：
影响因子：
9
通讯作者：
S. Georgiou;M. Aunedi;G. Strbac;C. Markides
中科院分区：
文献类型：
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作者：
S. Georgiou;M. Aunedi;G. Strbac;C. Markides
我们考虑了目前正在开发的两种中大型热力机械蓄能技术，即液体-空气蓄能(LAES)和抽水蓄热(PTES)。根据前人的工作，提出并使用了基于统一方法学的两种系统的一致热力学模型和成本计算方法，目的是将这两种技术的特点整合到一个全电力系统评估模型中，并在系统脱碳的不同情景下评估其系统级价值。研究发现，存储的价值取决于系统中存储的累积装机容量，存储技术在低渗透率时提供更大的边际效益。两个碳目标情景显示了类似的结果，更雄心勃勃的碳目标对储存的系统价值有积极影响。研究发现，存储工厂的位置和装机容量对这两种技术的系统价值和可接受成本有重大影响。研究发现，由于储存时间和效率较高，PTES的系统价值略高于LAES，尽管必须考虑到PTES的关键部件，即往复活塞式压缩机和膨胀机的性能不确定(尚未证明)，才能看到这些结果。与此同时，还发现PTES的电力资本成本较高，这使得其部署在较低容量的情况下在经济上不太有吸引力。结果表明，脱碳挑战的复杂性使得很难明确地确定一种“最佳”技术，并表明采用任何一种技术都可以提供显著的系统级好处。
We consider two medium-to-large scale thermomechanical electricity storage technologies currently under development, namely ‘Liquid-Air Energy Storage’ (LAES) and ‘Pumped-Thermal Electricity Storage’ (PTES). Consistent thermodynamic models and costing methods based on a unified methodology for the two systems from previous work are presented and used with the objective of integrating the characteristics of the technologies into a whole-electricity system assessment model and assessing their system-level value in various scenarios for system decarbonization. It is found that the value of storage depends on the cumulative installed capacity of storage in the system, with storage technologies providing greater marginal benefits at low penetrations. Two carbon target scenarios showed similar results, with a positive effect of more ambitious carbon targets on the system value of storage. The location and installed capacity of storage plants is found to have a significant impact on the system value and acceptable costs of both technologies. The system value of PTES was found to be slightly higher than that of LAES, driven by a higher storage duration and efficiency, although these results must be seen in light of the uncertainty in the (as yet, not demonstrated) performance of key PTES components, namely the reciprocating-piston compressors and expanders. At the same time, PTES was also found to have a higher power capital cost, which makes its deployment less economically attractive for implementation at lower volumes. The results indicate that the complexity of the decarbonization challenge makes it difficult to identify clearly a ‘best’ technology and suggest that the uptake of either technology can provide significant system-level benefits.