Coordination of medium-voltage distribution networks and microgrids based on an aggregate flexibility region approach

IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Sustainable Energy Grids & Networks Pub Date : 2024-07-24 DOI:10.1016/j.segan.2024.101485
Maoyi Zhou , Sheng Chen , Kun Huang , Jiaben Liang , Ming Fu , Guoqiang Sun
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Abstract

The large-scale integration of distributed energy resources (DERs) presents operational challenges for medium-voltage distribution networks (MVDNs) and microgrids (MGs) because the conventional centralized scheduling framework lacks of an effective information exchange mechanism for coordinating the scheduling between MVDNs and MGs while supporting privacy concerns. The present work addresses these issues by leveraging a convex hull-based aggregate flexibility region (AFR) associated with the scheduling capability of massive DERs to coordinate the scheduling between an MVDN and MGs efficiently with very limited information exchange. Specifically, the AFR associated with the DERs in an MG is constructed based on the convex hull fitting method, and coordinated scheduling is facilitated by introducing safety operation constraints for the MVDN based on the AFRs of the MGs. Moreover, the coordination model is transformed into a readily solvable quadratically constrained quadratic programming problem by applying second-order cone transformations. The results of numerical computations applied to an IEEE 33-bus test system demonstrate that the obtained AFRs effectively characterize the flexible scheduling capability of DERs, and the proposed coordinated scheduling mechanism between the MVDN and MGs reduces the network losses and voltage deviations of the MVDN, while preserving information privacy.

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基于总体灵活性区域方法的中压配电网和微电网协调
分布式能源资源(DERs)的大规模集成给中压配电网(MVDNs)和微电网(MGs)的运行带来了挑战,因为传统的集中式调度框架缺乏有效的信息交换机制,无法协调中压配电网和微电网之间的调度,同时也无法保护隐私。为了解决这些问题,本研究利用与大规模 DER 调度能力相关的基于凸壳的总体灵活性区域 (AFR),在信息交换非常有限的情况下有效协调 MVDN 和 MG 之间的调度。具体来说,基于凸壳拟合方法构建与 MG 中 DER 相关联的 AFR,并根据 MG 的 AFR 为 MVDN 引入安全运行约束,从而促进协调调度。此外,通过应用二阶锥变换,将协调模型转化为易于求解的二次约束二次编程问题。应用于 IEEE 33 总线测试系统的数值计算结果表明,所获得的 AFR 有效地表征了 DERs 的灵活调度能力,所提出的 MVDN 与 MG 之间的协调调度机制可降低 MVDN 的网络损耗和电压偏差,同时保护信息隐私。
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来源期刊
Sustainable Energy Grids & Networks
Sustainable Energy Grids & Networks Energy-Energy Engineering and Power Technology
CiteScore
7.90
自引率
13.00%
发文量
206
审稿时长
49 days
期刊介绍: Sustainable Energy, Grids and Networks (SEGAN)is an international peer-reviewed publication for theoretical and applied research dealing with energy, information grids and power networks, including smart grids from super to micro grid scales. SEGAN welcomes papers describing fundamental advances in mathematical, statistical or computational methods with application to power and energy systems, as well as papers on applications, computation and modeling in the areas of electrical and energy systems with coupled information and communication technologies.
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