A Decentralized Optimal Operation of AC/DC Hybrid Microgrids Equipped With Power Electronic Transformer

• Published in: IEEE access Vol. 7; pp. 157946 - 157959
• Main Authors: Dong, Lei, Zhang, Tao, Pu, Tianjiao, Chen, Naishi, Sun, Yingyun
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AC/DC hybrid microgrids; autonomous operation; Converters; decentralized optimal power flow; Distributed generation; Economic models; Electric power distribution; Hybrid power systems; Integrated circuit modeling; Load flow; Mathematical model; Microgrids; Optimization; power electronic transformer; Power flow; steady state model; Steady state models; Steady-state; Transformers
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2019.2949378

In the AC/DC hybrid microgrids equipped with power electronic transformer (PET), different AC grids and DC grids are connected through multiport PET to operate the entire network in a secure and economic manner. This paper proposes a decentralized optimal power flow model, considering the multiport coordinated control strategy of PET, for running autonomous AC/DC hybrid microgrids. To optimize the power flow in the network, the steady state model of PET is established, including voltage source converter power injection model and Kriging model. By introducing a secondary droop control layer can realize the autonomous operation of AC/DC hybrid microgrids and increase the utilization efficiency of distributed generations. Then using the analytical target cascading approach, each AC/DC sub-microgrid is regarded as different autonomous subjects. The distributed PET is as power coupling node and information interaction node to decompose the optimal problem of AC/DC hybrid microgrids equipped with PET which is solved in parallel. The obtained subproblems for these grid levels are solved with a nested solution process. The simulation results verify the correctness and effectiveness of the proposed model in this paper.