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Jointly optimization and distributed control for interconnected operation of autonomous microgrids

The number of autonomous microgrids (MGs) which are difficult to connect with the main gird is increasing, especially for those on islands or isolated areas. It is helpful to optimize the operation and utilization of resource in different space and time by interconnecting nearby MGs together. A method of jointly optimization and distributed control for interconnected operation of autonomous MGs is proposed in this paper. Firstly, taking the minimum generation cost as objective a jointly optimization model is proposed. And then a dynamic droop control strategy is designed for the real-time control of CDERs in each MG, so as to keep the power on tie-line to the optimizing result, guaranteeing the autonomy of MGs. Finally, an example demonstrates the effectiveness on optimizing resource and reducing the cost of operation. The simulation result confirms the validity of the proposed dynamic control strategy.