Decentralized Virtual Impedance- Conventional Droop Control for Power Sharing for Inverter-Based Distributed Energy Resources of a Microgrid

Elutunji Buraimoh, Anuoluwapo O. Aluko, Oluwafemi E. Oni and Innocent E. Davidson
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Elutunji Buraimoh: Department of Electrical Power Engineering, Durban University of Technology, Durban 4001, South Africa
Anuoluwapo O. Aluko: Department of Electrical Power Engineering, Durban University of Technology, Durban 4001, South Africa
Oluwafemi E. Oni: Department of Electrical Power Engineering, Durban University of Technology, Durban 4001, South Africa
Innocent E. Davidson: Department of Electrical Power Engineering, Durban University of Technology, Durban 4001, South Africa

Energies, 2022, vol. 15, issue 12, 1-16

Abstract: The work presents the power-sharing in a standalone low voltage AC microgrid consisting of three parallel grid supporting inverters using a virtual impedance-based droop system. Typically, isolated microgrids suffer unique challenges regarding voltage, current, frequency regulation, power flow control, and power-sharing due to the absence of a stiff AC grid source. This work investigated the power flow and sharing technical challenges using three inverter-based distributed energy sources, three static loads, and one dynamic load. These distributed energy sources are interconnected with the loads using low voltage line impedance within the microgrid to implement the uneven power distribution. Furthermore, a distributed grid supporting control utilizing virtual impedance is proposed in this work to improve power-sharing. The microgrid model is developed with the MATLAB Simulink environment and validated using the Opal RT OP4510 simulator. The proposed technique ensured improved power-sharing and mitigated the effect of voltage drops introduced through a virtual impedance using combined positive and negative virtual.

Keywords: droop control; microgrid; distributed energy resources; virtual impedance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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