When a fault occurs in the power system, the risk of large-scale renewable energy being disconnected to the power grid increases sharply, due to the fact that the protection and control mechanism for the renewable energy. Utilizing the islanding-operation ability of the renewable energy unit to restore power supply, can not only increase the consumption of renewable energy, but also enhance the power supply reliability of the power system, thereby improve the resilience of the power system. This paper firstly proposes a principle of coordinated restoration of renewable energy units and conventional generator units in the system recovery process after fault, and the hierarchical analysis method is then used to determine the unit restoration priority. Secondly, an islanding model is established to divide the power system into optimal electricity supply islands. The model is then solved using an improved genetic algorithm. Finally, case studies are performed to verify the effectiveness of the proposed coordinated restoration model and solving method.

Coordinated Restoration,Renewable Energy,Resilience,Restoration Priority,Genetic Algorithm (GA)