发表机构
Massachusetts Institute of Technology; Yonsei University; Ewha Womans University（麻省理工学院; 延世大学; 梨花女子大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出多时段交流最优潮流模型，评估长时间储能在高可再生能源电网中应对极端事件的可靠性价值，在200母线系统上使年度减载平均降低83.0%，并保障N-1事故下的运行可行性。
AI 中文摘要
长时间储能（LDES）可以缓解Dunkelflaute事件期间长时间的可再生能源与负荷之间的不平衡，但现有研究依赖于分区或线性化的直流网络模型，并且未能充分分析在全年广泛的可再生能源、负荷和事故场景下电网的运行可行性。为弥补这一空白，本文提出了一种多时段交流最优潮流（AC-OPF）公式，该公式捕捉了完整的非线性网络物理特性，并评估了高可再生能源电网中LDES的可靠性价值。为了评估跨越数天至数周的稀缺事件，全年运行被建模为一个8760小时的减载最小化问题，其场景从高斯copula模型中采样，该模型拟合了2010年至2025年的历史风力和母线级负荷数据，既代表了典型变率也代表了尾部事件。在合成的200母线伊利诺伊州输电网中，一个由电池储能（BESS）和LDES组成的混合车队，总功率为50兆瓦，相对于基础网络，平均减少了83.0%的年度减载，而同等功率下仅使用短时BESS则减少了68.5%。为了进一步考虑全年中意外的线路停运，该公式被扩展为多日安全约束的AC-OPF。在N-1事故下，基础网络无法获得可行的运行解，而配备LDES的网络在所有考虑的情况下均保持可行，从而节省了额外发电和输电容量的成本。在事故期间，LDES充当备用电源，平均仅比无事故基础情况多需要5.5%的发电量。
英文摘要
Long-duration energy storage (LDES) can mitigate prolonged renewable--load imbalances during Dunkelflaute events, but existing studies rely on zonal or linearized DC network models and inadequately analyze the operational feasibility of the grid across a wide range of full-year renewable, load, and contingency scenarios. To address this gap, this paper introduces a multi-period alternating-current optimal power flow (AC-OPF) formulation that captures the full nonlinear network physics and assesses the reliability value of LDES in high-renewable grids. To evaluate scarcity events spanning multiple days to weeks, full-year operation is modeled as an 8,760-h load-shedding minimization over scenarios sampled from a Gaussian copula model, fitted to 2010--2025 historical wind and bus-level load data, that represents both typical variability and tail events. On a synthetic 200-bus Illinois transmission network, a hybrid fleet of battery energy storage (BESS) and LDES with 50 MW total power reduces annual load shedding by 83.0% on average relative to the base network, versus 68.5% for short-duration BESS alone at equal power. To further account for unexpected line outages throughout the year, the formulation is extended to a multi-day security-constrained AC-OPF. Under N-1contingencies, no feasible operating solution is obtained for the base network, whereas the LDES-equipped network remains feasible in all considered cases, thereby saving the cost of additional generation and transmission capacity. During the contingency period, LDES acts as a backup power supply, requiring only 5.5% more generation on average than the no-contingency base case.
Comments39 pages, 12 figures
