Delay-tolerant hierarchical distributed control for DC microgrid clusters considering microgrid autonomy

IF 10.1 1区工程技术 Q1 ENERGY & FUELS

Applied Energy Pub Date : 2024-11-16 DOI:10.1016/j.apenergy.2024.124905

Yongpan Chen, Jinghan Zhao, Keting Wan, Miao Yu

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引用次数: 0

Abstract

A microgrid cluster (MGC) is formed by interconnected geographically adjacent microgrids (MGs), which can effectively improve power supply reliability. To fulfill the requirements of coordination between MGs while exerting the autonomy ability of each MG, this paper proposes a hierarchical distributed control method for DC MGCs with MG autonomous-cooperative mode switching. The proposed method can not only realize the proportional current sharing between the MGs and the voltage regulation of the common bus but also allow MGs to operate in autonomous or cooperative mode by establishing and disconnecting the inter-MG communication links. In addition, considering that the delay of inter-MG communication links affects multiple control links of the proposed control method, a delay-dependent stability analysis method based on Padé approximation and eigenvalue spectrum comparison is proposed. By stability analysis, the time delay margin (TDM) is determined, and the key link that determines the TDM is identified as the observer based on the proportional-integral (PI) consensus algorithm. On this basis, the scattering transformation (ST) is introduced to improve the stability of the observer under delay and thus enhance the TDM of DC MGCs, which is confirmed by stability analysis based on a new system model integrating node variables and edge variables. Finally, the performance of the proposed control method and stability analysis results are verified by hardware-in-loop (HIL) tests and MATLAB/Simulink simulations

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考虑微电网自主性的直流微电网集群延迟容错分级分布式控制

微电网集群（MGC）由地理位置相邻的微电网（MG）相互连接而成，可有效提高供电可靠性。为了在发挥各 MG 自主能力的同时满足 MG 间协调的要求，本文提出了一种具有 MG 自主-合作模式切换功能的直流 MGC 分层分布式控制方法。该方法不仅能实现 MG 间的比例电流分担和公共母线电压调节，还能通过建立和断开 MG 间通信链路让 MG 以自主或合作模式运行。此外，考虑到 MG 间通信链路的延迟会影响所提出控制方法的多个控制链路，提出了一种基于 Padé 近似和特征值频谱比较的延迟相关稳定性分析方法。通过稳定性分析，确定了时延裕度（TDM），并根据比例积分（PI）共识算法确定了决定 TDM 的关键环节为观测器。在此基础上，引入了散射变换（ST），以提高观测器在延迟下的稳定性，从而增强直流 MGC 的 TDM，并通过基于节点变量和边缘变量集成的新系统模型的稳定性分析证实了这一点。最后，通过硬件在环（HIL）测试和 MATLAB/Simulink 仿真验证了所提控制方法的性能和稳定性分析结果。

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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来源期刊

Applied Energy 工程技术-工程：化工

CiteScore

21.20

自引率

10.70%

发文量

1830

审稿时长

41 days

期刊介绍： Applied Energy serves as a platform for sharing innovations, research, development, and demonstrations in energy conversion, conservation, and sustainable energy systems. The journal covers topics such as optimal energy resource use, environmental pollutant mitigation, and energy process analysis. It welcomes original papers, review articles, technical notes, and letters to the editor. Authors are encouraged to submit manuscripts that bridge the gap between research, development, and implementation. The journal addresses a wide spectrum of topics, including fossil and renewable energy technologies, energy economics, and environmental impacts. Applied Energy also explores modeling and forecasting, conservation strategies, and the social and economic implications of energy policies, including climate change mitigation. It is complemented by the open-access journal Advances in Applied Energy.