Kang Sungwoo, Jung Seungmin, Lee Dongwon, Jang Gilsoo
School of Electrical Engineering, Korea University, Seoul, 02841, Republic of Korea.
School of Electrical and Computer Engineering, University of Seoul, Seoul, 02504, Republic of Korea.
Sci Rep. 2024 Sep 2;14(1):20390. doi: 10.1038/s41598-024-68728-6.
With the global consensus to achieve carbon neutral goals, power systems are experiencing a rapid increase in renewable energy sources and energy storage systems (ESS). Especially, recent development of hub substations (HS/S) equipped with ESS, applicable for resolving site constraints if implemented as mobile transformers, is expanding the development of ESS-equipped facilities. However, these units require centralized control strategies considering variability within integrated networks. While studies on electric vehicle charging considering the variability of renewable energy or load are widely studied, ESS management scheme for individual substations requires further optimization, especially considering the state of distributed sources at lower levels and transmission system operators. Thus, in this study, an optimal control approach for ESS located at the connection point of transmission and distribution systems, including further consideration of the loss in distribution lines and the constraints of renewable energy sources is presented. This study attempts to derive proactive control strategies for ESS in HS/S to operate with various distribution networks. By establishing control priorities for each source through optimal operation strategy, a suitable capacity of ESS and its economic benefits for distribution network management can be examined. Validation of the current analysis results is performed by utilizing MATPOWER. By adapting the operational range of design scenarios, diverse distribution systems can be tested against multiple configurations of connected devices.
随着全球达成实现碳中和目标的共识，电力系统中可再生能源和储能系统（ESS）的占比迅速增加。特别是，近期配备ESS的枢纽变电站（HS/S）的发展，如果将其作为移动变压器实施，可解决场地限制问题，这正在推动配备ESS设施的发展。然而，这些装置需要考虑综合网络内的变化性的集中控制策略。虽然关于考虑可再生能源或负荷变化性的电动汽车充电的研究已广泛开展，但针对单个变电站的ESS管理方案仍需进一步优化，特别是要考虑较低层级的分布式电源状态和输电系统运营商。因此，在本研究中，提出了一种针对位于输配电系统连接点的ESS的最优控制方法，其中进一步考虑了配电线路损耗和可再生能源的约束条件。本研究试图推导HS/S中ESS的主动控制策略，以便在各种配电网中运行。通过最优运行策略为每个电源建立控制优先级，可以研究ESS的合适容量及其对配电网管理的经济效益。利用MATPOWER对当前分析结果进行验证。通过调整设计场景的运行范围，可以针对连接设备的多种配置测试不同的配电系统。
