Adaptive Islanding Strategy of Sustainable Distribution System for Post-restoration Failures

The power system is susceptible to failures, and further interruptions by subsequent outages which may cause extended events in the formed island. Most of the literature reviewed has focused on island formation after the disconnection of the main grid supply. However, there is still a need to analyze the post-restoration failures to improve the resilience and minimize the pro-longed disconnection of priority customers. The current research investigates the behavior of islanding schemes under secondary collapses and provides an adaptive solution to withstand such severities. A new total active critical node finding methodology is presented which eases the rearrangement of the initially formed island when affected by multiple faults or DG failures. The concept of single islanding with the coordination of multiple DGs is also discussed, in which the DG's power-sharing capacity is not confined to the boundaries of only particular islands. An economic plan is also proposed to select the controlled type DGs to reduce the overall cost of generation by reducing fuel cost. To evaluate the network's effectiveness and robustness, the proposed adaptive method is deployed on an updated IEEE 69-bus distribution system.