Microgrid design using folded P-f droop and new grid interface unit to minimize the need for communication

Xiaozuo Huang, Dong Chen, Lie Xu

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A new control scheme is proposed for microgrids to enable seamless switching between islanded mode and grid-connected mode in this paper. Utilizing a specially designed interface unit as the interface device, a systematic control strategy is proposed to enable a smooth and autonomous transition from grid-connected to islanded and vice-versa. With the proposed scheme, the need for high-speed communication is eliminated despite of the change of operational mode. To make this happen, a folded droop scheme is proposed to enable autonomous frequency support for paralleled converters in the microgrid and a coordinating strategy is then proposed to enable autonomous re-synchronization with the main grid as well. The control scheme proposed are validated with a benchmark microgrid model of parallel- connected converters using MATLAB/SIMULINK. The results show that the proposed control can enable autonomous smooth transitions between modes with reduced power rating in the interface converter unit.
Original languageEnglish
Article number106949
Number of pages10
JournalInternational Journal of Electrical Power and Energy Systems
Early online date24 Mar 2021
Publication statusPublished - 24 Mar 2021


  • microgrid
  • seamless transition
  • back-to-back converter
  • islanded mode
  • re-synchronization
  • grid-connected mode
  • autonomous operation


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