Research on autonomous operation and mutual aid strategy of AC/DC hybrid microgrid cluster

• Published in: Electric power systems research 2024-06, Vol.231, p.110302, Article 110302
• Main Authors: Wang, Chenxia, Han, Ji, Jiang, Dong, Zhang, Wenkui, Yang, Weichen, Song, Huihui, Deng, Yuting, Qu, Yanbin
• Format: Article
• Language: English
• Subjects: AC/DC hybrid microgrid cluster; Distributed control; Economic control; Finite-time consistency control; Time delay
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/j.epsr.2024.110302

•Autonomous operation and mutual aid strategy of AC/DC hybrid microgrid cluster.•Improved finite-time consistency algorithm considering communication delays.•Improve system convergence speed and robustness.•Balancing the control objectives of stability and economy. In order to address the challenge of ensuring convergence and stability in AC/DC hybrid microgrid cluster with self/mutual communication delay, this study proposes a hierarchical control strategy. By leveraging the finite-time consistency algorithm, this strategy facilitates autonomous operation of sub-microgrids and enables mutual aid and assistance within the microgrid cluster. The proposed control strategy consists of two levels: the sub-microgrid level and the microgrid cluster level. Both levels utilize primary control along with a secondary adjustment term based on improved finite-time consistency. This strategy aims to ensure frequency and voltage stability, power equalization in the sub-microgrids, and economic allocation of power in the microgrid cluster. The proposed control strategy improves the traditional finite-time consistency protocol, considers the effect of time delay on system stability. It also introduces the convergence coefficient to strike a balance between system economy and stability objectives. Through a comparison with the traditional consistency algorithm, simulation results demonstrate that the proposed control strategy enhances the robustness of the system, enables coordinated control of frequency and voltage in sub-microgrids, facilitates economic power allocation in the microgrid cluster, and achieves faster convergence speed.