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

Authors :
Mohamed M. Zakaria Moustafa
Ahmed Al-Durra
M. A. Aboushal
Hatem H. Zeineldin
Tarek H. M. EL-Fouly
Source :
IEEE Transactions on Sustainable Energy. 12:1960-1973
Publication Year :
2021
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2021.

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.

Details

ISSN :
19493037 and 19493029
Volume :
12
Database :
OpenAIRE
Journal :
IEEE Transactions on Sustainable Energy
Accession number :
edsair.doi...........6b3fd15ee1c5847352c318f69eb7ed61
Full Text :
https://doi.org/10.1109/tste.2021.3074248