Droop control is the most favorable choice in wireless control of the grid-forming DGs connected in parallel. But, in microgrid applications, the dynamic characteristic of the conventional droop control is poor because the inertia is extremely low and the transmission line is relatively short. A simple output impedance parameter control method which minimizes the circulating current between grid-forming DGs in the steady-state is proposed in this paper. It also enhances power and harmonic sharing accuracy. The proposed scheme utilizes adjustable virtual output impedance instead of the reactive droop controller. The effectiveness of the proposed scheme was validated through the high-speed FPGA-based real-time simulation which runs the power circuit model every 500 ns.
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