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The accuracy and computational feasibility of composite reliability assessment (CRA) have become a significant challenge with the increasing size of power grids and the penetration of highly intermittent renewable sources. Since the nonsequential Monte Carlo simulation (MCS) and analytical models cannot incorporate time-dependent quantities, improving the computation speed of sequential MCS for CRA is essential. This paper proposes a new method for CRA based on deep neural networks (DNN) within the sequential MCS framework. The DNN is designed to replace the computationally expensive optimal power flow solved in every time-step within the CRA. The DNN is trained as a regression algorithm that estimates the generator, energy storage dispatch, and load curtailment. A novel training strategy based on generator failure rates and load levels is implemented for efficient training of the DNN. The …