Active Defense Strategy for Elastic Power Grid Considering Load Importance

In recent years, typhoons have been occurring more and more frequently in southeastern China, which has a significant impact on the safe operation of power systems. The traditional active defense strategy does not consider the load importance easily leads to the masking phenomenon, so this paper proposes an active defense strategy that considers the load importance to solve the problem that the actual resilience is smaller than the calculated resilience when the important load is out of power. In this paper, firstly, a typhoon wind field model is established to simulate the effect of typhoon on power components. Second, a Markov decision process is used to model the system state transitions. Again, component failure probabilities and typhoon spatial and temporal characteristics are considered to provide a generative scheduling strategy for each possible system state. Various system constraints are considered in the scheduling of the actual system, including the generator creep rate and the importance of different loads. Finally, the proposed strategy is validated under various impact scenarios using an IEEE 9-node system. The results show that the method in this paper improves the resilience of the grid compared to the minimum load-cutting strategy and avoids masking due to the outage of important loads.