In order to solve the fault recovery of distribution networks after accidents under extreme disasters

a coordinated optimization method of fault repair and restoration of distribution networks under dynamic restoration of power supply capacity is proposed

which quickly restores the power supply capacity through reconfiguration and repair of distribution networks under extreme disasters. First

the coupled planning model of distribution network fault restoration considering islanding

reconfiguration

and repair is created by comprehensively considering important load restoration

network loss

and the number of switch actions

and the layers interact with each other and dynamically optimized to ensure that the distribution network is reliably and quickly restored to normal.Then

the models and algorithms of each layer are introduced respectively

and the dynamic islanding strategy is adopted to realize faster and better restoration of power supply capacity during distribution network fault repair using the improved whale optimization algorithm(WOA) and dynamic recovery strategy. Finally

the effectiveness of the proposed strategy is verified by arithmetic simulation.