And the scheme is most affordable when hydrogen energy accounts for 95%. The scheme presents a compromise between environment and economy will cost $3.95 billion while bringing a 61% reduction in emission compared with the baseline, which relies upon on-grid and natural gas. The results of the real-world case show that the present value of the cost of achieving carbon emissions neutrality is $ 8.61 billion (10⁹). There is an optimal scheme for realising carbon emissions neutrality in industrial parks, which will cost a relatively high price and the compromise scheme which can implement low carbon emissions is also worth studying. Photovoltaic power generation, electrolysis hydrogen production are considered in the model. A carbon emissions neutral framework of electric-thermal hydrogen-based containing MILP energy optimisation model is constructed. This article is devoted to discussing the feasibility and the optimal scheme to implement an electric-thermal carbon emissions neutral industrial park and perform a 3E analysis on various scenarios. The results show that the proposed model can not only effectively evaluate the overall safety of the network, but also has feasibility in predicting faults, which can provide a theoretical basis for the stability control of the hybrid AC/DC system. Finally, the improved IEEE-39 node hybrid AC/DC system is taken as an example for analysis. Considering the dynamic update model of network cascading failures, the clique tree propagation algorithm is used to dynamically calculate the posterior risk probability of the node to realize the dynamic assessment of the network risk. Based on the operating data of the power grid, the energy function is used as an efficiency variable, and the efficiency variable is integrated into the prior risk probability calculation of nodes in the network, and a Bayesian network-based risk assessment model of hybrid AC/DC system is established. First, based on the energy transfer relationship of the hybrid AC/DC power system, the transient energy function model of the hybrid AC/DC system is established. In order to accurately assess the risk of the hybrid AC/DC network under fault, a risk assessment method for the hybrid AC/DC system based on transient energy function is proposed.
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