Deep Belief Network Enabled Surrogate Modeling for Fast Preventive Control of Power System Transient Stability

The widely used transient stability constrained optimal power flow (TSC-OPF) method for power system preventive control is very time consuming and thus not applicable for large-scale systems. This paper proposes a new deep learning-enabled surrogate model that can significantly improve computational efficiency while maintaining high accuracy. To achieve that, the deep belief network (DBN) is strategically integrated with the reference-point-based non-dominated sorting genetic algorithm (NSGA-III) to develop a new preventive control framework. The DBN allows us to identify the mapping relationship between the transient stability index (TSI) and system operational features. The identified functional mapping relationship is further used as the surrogate to connect the DBN results with TSC-OPF for preventive control. The integrated NSGA-III and surrogate model enables the multi-objective optimization to consider various constraints and objectives, such as minimization of costs of generation dispatch and load shedding while maintaining the system stability. Extensive simulation results on several IEEE test systems show that the proposed method can achieve highly efficient control solutions and outperform other alternatives from computational efficiency and economic benefits.