The Phase Locked Loop controller parameters are the key-point that affects\nthe dynamic performance of the autonomous microgrid. They have to be optimally\ntuned to guarantee enhanced overall system stability. In this paper,\ntwo-microgrid plant with their associate PWM inverter connected to the ac\nmain grid and the load is used as an example to demonstrate the capabilities\nof the proposed system. The Phase Locked Loop controller is designed and\ntuned using the Simulating Annealing algorithm. This algorithm is used to\nselect the Phase Locked Loop PI controller gains with optimal percentage\novershoot, rise time and settling time. The controller is tested during the\ntransition between grid-connected and autonomous operation and in reverse\norder. The controller is compared with Ziegler and Nichols P and PI controllers.\nIt shows the effectiveness and the extraordinary control response of the\nproposed control technique with respect to percentage overshoot, rise time\nand settling time control parameters compared to the conventional one.
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