A Novel Unified Controller for Grid-Connected and Islanded Operation of PV-Fed Single-Stage Inverter

Mohamed M.Zakaria Moustafa, Mohamed Aboushal, Tarek El-Fouly, Ahmed Al-Durra, Hatem Zeineldin

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

This paper presents a novel robust current droop controller (RCDC) using a single droop loop. This scheme is unified supporting dual mode of operation for micro-grids (MGs), including grid connected mode (GCM) and islanded mode (ISM) while ensuring seamless transition between the two modes with proportional power sharing maintained. The proposed controller is further incorporated with an improved maximum power point tracking (MPPT) technique presented for the parallel operation of single-stage inverters fed by multi-string PV array topology. In addition, an improved phase-locked-loop-less (PLL-less) method is presented supporting self-synchronization strategy of the parallel operation of PV-inverters with the main grid while maintaining the full capabilities of the unified control architecture. This obviates the usage of conventional PLLs, which are widely used with active synchronization techniques. The performance of the proposed control scheme is validated using real time simulations (RTS) developed by dSPACE MicroLabBox.

Original languageBritish English
Pages (from-to)1960-1973
Number of pages14
JournalIEEE Transactions on Sustainable Energy
Volume12
Issue number4
DOIs
StatePublished - Oct 2021

Keywords

  • Distributed Generation
  • MPPT
  • Self-Synchronization
  • Smart Grid
  • Unified Droop Controller

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