期刊
ENERGIES
卷 15, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/en15124439
关键词
droop control; microgrid; distributed energy resources; virtual impedance
资金
- DUT Smart Grids Research
- DUT Directorate for Research and Postgraduate Supports
This work investigates the power flow and sharing challenges in a standalone low voltage AC microgrid using a virtual impedance-based droop system. The proposed technique ensures improved power-sharing and mitigates the effect of voltage drops introduced through a virtual impedance.
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.
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