To address the issue that substations are prone to failures during flood disasters, which further cause large-scale and prolonged power outages, a coordinated optimal allocation strategy of flood control resources is proposed to enhance power grid resilience. Firstly, the failure and network features for substations are constructed considering the uncertainty of flood depth. Subsequently, a representative set of failure scenarios for transmission and distribution (T&D) substations is generated based on feature selection. Secondly, accounting for the coupling relationship between the availability status of T&D substations and the operation strategies of active distribution networks, a transmission-distribution coordinated stochastic optimization model is established to optimize the allocation of flood control resources. The objective is to minimize the system’s expected comprehensive costs incurred by substation structural damage and load shedding constrained by the pre-disaster substation protection constraints and the operation constraints in T&D networks during flood disasters. Finally, numerical case studies based on the improved T24D40 system are conducted. The results demonstrate that the feature-selection-based scenario generation method enables the critical substations with high failure rates and network importance to gain higher protection priority. More importantly, compared with separate decision-making and with limited coordinated decision-making for T&D substation protection schemes, the proposed model, which could effectively maximize the utilization efficiency of flood control resources, reduces the system’s expected comprehensive costs by 32.1% and 8.9%, respectively.
Cui et al. (Wed,) studied this question.