A Generic Power Flow Algorithm for Unbalanced Islanded Hybrid AC/DC Microgrids

• Published in: IEEE transactions on power systems Vol. 36; no. 2; pp. 1107 - 1120
• Main Authors: Pompodakis, Evangelos E., Kryonidis, Georgios C., Demoulias, Charis, Alexiadis, Minas C.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.03.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AC/DC hybrid microgrids; Admittance; Algorithms; bipolar DC microgrids; Conductors; Distributed generation; Electric converters; Grounding; Integrated circuits; interlinking converter; Load flow; Microgrids; multi-grounded networks; Power flow; Robustness; Robustness (mathematics)
• ISSN: 0885-8950; 1558-0679
• DOI: 10.1109/TPWRS.2020.3012815

This paper proposes a precise power flow algorithm for islanded hybrid AC/DC microgrids (HMGs). In our analysis, we have considered a multi-grounded unbalanced bipolar DC microgrid and a multi-grounded four-wire AC microgrid connected through one or more interlinking converters (ICs). The proposed method is based on the implicit Z BUS method, presenting fast convergence and robustness regardless of the R / X ratio of the lines. It can be applied in all network configurations including highly meshed distribution systems. Numerical simulations are conducted in a 12-Bus and a 47-Bus islanded unbalanced HMG to verify the validity of the proposed power flow approach considering several distributed generator (DG) operational modes. A case study in a large 1024-Bus islanded HMG further highlights the outstanding accuracy and computational performance of the proposed approach against other existing power flow methods.