When the line impedance is considered in the\nmicrogrid, the accuracy of load sharing will decrease. In\nthis paper, the impact of line impedance on the accuracy of\nload sharing is analyzed. A robust droop control for a high voltage\nmicrogrid is proposed based on the signal detection\non the high-voltage side of the coupling transformer. For a\nhigh-voltage microgrid, the equivalent impedance of coupling\ntransformer connecting distributed generator with the\ngrid is usually the dominate factor. Compared with the\nconventional droop control strategy, the proposed control\nmethod in this paper detects the feedback signal from the\nhigh-voltage side of the coupling transformer. The impact\nof line impedance on the load sharing accuracy can be\nmitigated significantly. The proposed droop control only\nchanges the detection point of the feedback signal, thus it is\neasy to be implemented. The PSCAD/EMTDC simulation\nresults show the effectiveness of the proposed robust droop\ncontrol concept in load sharing and voltage regulation with\nhighly accuracy.
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