Development a New Flexibility Index Suitable for Power System Operational Planning

H. Berahmandpour, S. Kouhsari, H. Rastegar
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Abstract

Article history: Received 28 December 2021 Received in revised form 19 February 2022 Accepted 24 February 2022 Power system flexibility is an important characteristic in both power system planning and operation, which should be evaluated and maintained in the desired value. On the other hand, more renewable energy integration leads to increasing uncertainty and variability in the power system. Therefore, the power system should have the sufficient ability to overcome the adverse effects of uncertainty and variability named as flexibility, which should be improved with suitable tools such as adequate reserve, fast ramp-up/down generation sources and suitable energy storage capacity. Power system flexibility evaluation is the main task that needs suitable indices to indicate the level of system flexibility correctly. In the current paper, a well-known system flexibility index named normalized flexibility index, which is used for power system planning horizon is modified to use for the operational planning time zone. In this concept, the flexibility index is separated into two components, each of them indicating the ability of the power system to withstand upward/downward net-load uncertainty and variability. In the further, this is shown these two components are the same as the upward/downward system reserve and can be converted to economic value simply. So, this concept facilitates the economic trade-off between operation cost and system flexibility, improving cost to achieve the best level of system flexibility.
一种适用于电力系统运行规划的柔性指标
文章历史:接收2021年12月28日接收2022年2月19日接收2022年2月24日接收电力系统灵活性是电力系统规划和运行中的一个重要特征,应对其进行评估并保持在所需值。另一方面,更多的可再生能源整合导致电力系统的不确定性和可变性增加。因此,电力系统应该有足够的能力来克服不确定性和可变性的不利影响,即灵活性,应该通过适当的工具来提高灵活性,例如充足的储备,快速的上/下发电源和合适的储能容量。电力系统柔性评价是电力系统柔性评价的主要任务,需要合适的指标来正确反映电力系统的柔性水平。本文将用于电力系统规划水平的一种著名的系统柔性指标——归一化柔性指标进行了改进,使其适用于运行规划时区。在这个概念中,灵活性指标被分为两个部分,每个部分都表示电力系统承受净负荷向上/向下不确定性和可变性的能力。在进一步,这表明这两个组成部分是相同的向上/向下系统储备,可以简单地转换为经济价值。因此,这一概念有助于在运行成本和系统灵活性之间进行经济权衡,提高成本以达到系统灵活性的最佳水平。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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