Self-Healing Fault Reconstruction Strategy for Island Emergency Power Grid Based on Floyd-MPSO

In the island power system, due to the special geographical location of the island, variable and unpredictable weather, power outages occur from time to time and power cannot be reliably guaranteed, so it is necessary to establish an emergency power grid to ensure the power supply of important loads in case of faults, and distributed power supplies (DGs) can play an important role with their characteristics of rapid response, simple structure and flexibility. In the fault reconstruction recovery, firstly, the structural characteristics of the distribution network are reasonably optimized to reduce the complexity of the solution; secondly, the key influence of the DG start-up sequence on the recovery path is discussed based on the start-up and operation characteristics of the DG. In order to ensure fast and stable recovery of more important loads, the Floyd-MPSO algorithm is combined with the minimum path cost and the maximum recovery of important loads as the objective, and the power balance and other constraints, in which the Floyd algorithm is used to search in advance to obtain the shortest path matrix among DGs with the optimized distribution network as the base, and then the inertia factor of the standard particle swarm optimization algorithm is adjusted adaptively to improve the defect that the particle is easy to fall into the local optimal and cannot jump out.The results verify that the combination of the two can improve the effectiveness and speed of fault reconstruction.