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Title
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Active Power Sharing and Frequency Restoration in an Autonomous Networked Microgrid
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Type
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JournalPaper
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Keywords
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Distributed generation (DG), droop control, frequency restoration, microgrid (MG), power control, renewable energy resources (RESs).
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Abstract
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Microgrid (MG) concept is considered as the best solution for future power systems, which are expected to receive a considerable amount of power through renewable energy re- sources and distributed generation units. Droop control systems are widely adopted in conventional power systems and recently in MGs for power sharing among generation units. However, droop control causes frequency fluctuations, which leads to poor power quality. This paper deals with frequency fluctuation and stability concerns of f-P droop control loop in MGs. Inspired from con- ventional synchronous generators, virtual damping is proposed to diminish frequency fluctuation in MGs. Then, it is demonstrated that the conventional frequency restorationmethod inserts an offset to the phase angle, which is in conflict with accurate power sharing. To this end, a novel controlmethod, based on phase angle feedback, is proposed for frequency restoration in conjunction with a novel method for adaptively tuning the feedback gains to preserve precise active power sharing. Nonlinear stability analysis is conducted by drawing the phase variations of the nonlinear second-order equa- tion of the δ-P droop loop and it is proved that the proposedmethod improves the stabilitymargin of f-Pcontrol loop. Simulation results demonstrate the effectiveness of the proposed method
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Researchers
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li li (Second Researcher), frede Blaabjerg (Fifth Researcher), pierluigi siano (Fourth Researcher), Mohammad Hassan Moradi (Third Researcher), mohsen Eskandari (First Researcher)
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