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An improved Proportional-Derivative (PD) droop control strategy is proposed in this paper for stable operation and improved disturbance response of the islanded inverter-dominated AC microgrid. The proposed strategy (i) is simple and easy to implement., (ii) does not require communication between distributed energy resources, and (iii) significantly improves microgrid dynamic response and stability. Performance of the proposed improved PD droop control strategy is investigated using a detailed and realistic study system, and its effectiveness is verified using extensive simulation studies in the PSCAD/EMTDC software. The study results indicate that the proposed control strategy enables effective voltage and frequency regulation, i.e., limited deviations, in the inverter-dominated microgrid without causing power oscillations between inverters.
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Lahiji et al. (2018) studied this question.
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