An Improved Fault Restoration Strategy for Distribution Network Power System

For problems of distribution network fault restoration, this paper proposes an improved fault restoration strategy based on minimum spanning tree algorithm and heuristic rules. Firstly, the whole distribution network is regarded as a weighted graph, and on the basis of power flow calculation, the Kruskal algorithm is used to solve the minimum spanning tree of the network to find the optimal restoration path that satisfies multiple constraints. Then, the heuristic rules for cooperative recovery of feeder and distributed power supply in the restoration path are established, the residual capacity of feeder and distributed power supply after fault is analyzed, and the problem of line voltage exceeding limit is eliminated by connecting switch. The search space for power supply restoration problems is greatly reduced. Finally, Matlab is used to test node system in IEEE 33 and the improved IEEE 123 to verify the proposed method.