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arXiv 2111.03313eess.SYcs.SYmath.OC
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考虑电池退化的能量受限微电网随机运行

Stochastic Operation of Energy Constrained Microgrids Considering Battery Degradation

Per Aaslid, Magnus Korpås, Michael M Belsnes, Olav B Fosso

摘要:

可变可再生能源发电渗透率高的电力系统易受低发电时段的影响。保持高可调度发电容量的替代方案是能够利用剩余功率的电能存储,其中电能存储有助于供应的安全性。这样的系统可以被认为是能量受限的,并且电能存储的操作必须平衡操作成本最小化和稀缺风险。在这个问题上,依赖于操作的存储特性,例如能量存储退化是一个复杂的因素。本文提出了一种线性近似的电池充电状态退化,并实现它在一个随机的双动态规划的能量管理模型结合循环退化。退化建模的影响进行了研究,挪威的小型微电网可变的可再生能源发电和有限的可调度发电容量,以及电池和氢存储,以平衡供需。我们的研究结果表明,所提出的策略可以延长预期的电池寿命超过四年相比,天真的随机策略,但可能会导致其他系统资源的退化增加。同样明显的是,一个随机的策略是至关重要的,以保持低风险的稀缺性,在能量受限的系统。

英文摘要:

Power systems with high penetration of variable renewable generation are vulnerable to periods with low generation. An alternative to retain high dispatchable generation capacity is electric energy storage that enables utilization of surplus power, where the electric energy storage contributes to the security of supply. Such systems can be considered as energy-constrained, and the operation of the electric energy storage must balance operating cost minimization and the risk of scarcity. In this matter, operation dependent storage characteristics such as energy storage degradation are a complicating factor. This paper proposes a linear approximation of battery state-of-charge degradation and implements it in a stochastic dual dynamic programming based energy-management model in combination with cycling degradation. The implications of degradation modelling are studied for a small Norwegian microgrid with variable renewable power generation and limited dispatchable generation capacity as well as battery and hydrogen storage to balance supply and demand. Our results show that the proposed strategy can prolong the expected battery lifetime by more than four years compared to the naive stochastic strategy but may cause increased degradation for other system resources. It is also evident that a stochastic strategy is crucial to retain low risk of scarcity in energy-constrained systems.

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