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A hybrid impedance model of Islanded MicroGrid with Paralleled Inverters Controlled by Droop and PQ Strategies (IMG-PICDPS) is derived, in which the PQ-controlled Inverters (PQ-Invs) are equivalent to Norton's circuits, while the DRoop-controlled Inverters (DR-Inv) to Thevenin's circuits in this paper. An impedance-based stability analysis method is further proposed according to the Nyquist criterion...
A unified controller for a voltage source inverter (VSI) is one of the most important technologies for a microgrid to switch smoothly between grid-connected mode and islanding mode. Generally, as the control objectives of grid-connected and islanding modes are different, the controller adopts different control algorithms for the two modes, which demands to monitor the operating status of the microgrid...
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