物理和虚拟能源存储在去碳化电力系统中的容量信用评估方法
Methodology for Capacity Credit Evaluation of Physical and Virtual Energy Storage in Decarbonized Power System
AI总结：
本文提出一种新框架评估物理和虚拟能源存储的容量信用，通过两阶段协调调度和不确定性建模，改进了存储系统的可靠性与容量信用评估。
摘要：
能源存储（ES）和虚拟能源存储（VES）是实现电力系统脱碳的关键组成部分。尽管ES和VES已被证明能够提供多种电网服务，但迄今为止很少有工作提供了系统量化其充足贡献和可信容量价值的框架，同时考虑人类和市场行为。因此，本文提出了一种新的评估框架来评估ES和VES的容量信用（CC）。为了解决系统容量不足和存储市场行为问题，提出了一种两阶段协调调度，以在日前资源自我能源管理与实时故障高效调整之间取得平衡。我们进一步用存储操作建模了人类行为，并将两种决策无关不确定性（DIUs）（运行状态和自消费）和一种决策相关不确定性（DDUs）（可用容量）纳入所提出的调度中。此外，引入了新的可靠性和CC指数（例如等效物理存储容量（EPSC））来评估ES和VES的实际和理论充足贡献，以及在维持等效系统充足性的同时替代发电和物理存储的能力。基于IEEE RTS-79系统和实际数据的详尽案例研究验证了忽略DIUs和DDUs在先前工作中的显著后果（10%-70%高估CC），而所提出的方法优于其他方法，能够生成可信且现实的结果。最后，我们调查了影响ES和VES充足贡献的关键因素，并提供了合理建议，以更好地利用ES和VES在去碳化电力系统中的灵活性。
英文摘要：
Energy storage (ES) and virtual energy storage (VES) are key components to realizing power system decarbonization. Although ES and VES have been proven to deliver various types of grid services, little work has so far provided a systematical framework for quantifying their adequacy contribution and credible capacity value while incorporating human and market behavior. Therefore, this manuscript proposed a novel evaluation framework to evaluate the capacity credit (CC) of ES and VES. To address the system capacity inadequacy and market behavior of storage, a two-stage coordinated dispatch is proposed to achieve the trade-off between day-ahead self-energy management of resources and efficient adjustment to real-time failures. And we further modeled the human behavior with storage operations and incorporate two types of decision-independent uncertainties (DIUs) (operate state and self-consumption) and one type of decision-dependent uncertainty (DDUs) (available capacity) into the proposed dispatch. Furthermore, novel reliability and CC indices (e.g., equivalent physical storage capacity (EPSC)) are introduced to evaluate the practical and theoretical adequacy contribution of ES and VES, as well as the ability to displace generation and physical storage while maintaining equivalent system adequacy. Exhaustive case studies based on the IEEE RTS-79 system and real-world data verify the significant consequence (10%-70% overestimated CC) of overlooking DIUs and DDUs in the previous works, while the proposed method outperforms other and can generate a credible and realistic result. Finally, we investigate key factors affecting the adequacy contribution of ES and VES, and reasonable suggestions are provided for better flexibility utilization of ES and VES in decarbonized power system.
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