Single-Phase Microgrid with Seamless Transition Capabilities between Modes of Operation

Alexander Micallef, Maurice Apap, Cyril Spiteri-Staines, Josep M. Guerrero

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Microgrids are an effective way to increase the penetration of DG into the grid. They are capable of operating either in grid-connected or in islanded mode thereby increasing the supply reliability for the end user. This paper focuses on achieving seamless transitions from islanded to grid-connected and vice versa for a single phase microgrid made up from voltage controlled voltage source inverters (VC-VSIs) and current controlled voltage source inverters (CC-VSIs) working together in both modes of operation. The primary control structures for the VC-VSIs and CC-VSIs is considered together with the secondary control loops that are used to synchronize the microgrid as a single unit to the grid. Simulation results are given that show the seamless transitions between the two modes without any disconnection times for the CC-VSIs and VC-VSIs connected to the microgrid.
Original languageEnglish
JournalI E E E Transactions on Smart Grid
Issue number6
Pages (from-to)2736-2745
Number of pages10
Publication statusPublished - Nov 2015


  • Microgrids
  • MGCC
  • Droop Control
  • Islanded
  • Grid- Connected
  • Seamless Transition

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