The sharp increase in the total installed capacity of natural gas generators has intensified the dynamic interaction between the electricity and natural gas systems, which could induce cascading failure propagation across the two systems that deserves intensive research. Considering the distinct time response behaviors of the two systems, this paper discusses an integrated simulation approach to simulate the cascading failure propagation process of integrated electricity and natural gas systems (IEGSs). On one hand, considering instantaneous re-distribution of power flows after the occurrence of disturbance or failure, the steady-state AC power flow model is employed. On the other hand, gas transmission dynamics are represented by dynamic model to capture the details of its transition process. The interactions between the two systems, intensified by energy coupling components (such as gas-fired generator and electricity-driven gas compressor) as well as the switching among the operation modes of compressors during the cascading failure propagation process, are studied. An IEGS composed of the IEEE 30-bus electricity system and a 14-node 15-pipeline gas system is established to illustrate the effectiveness of the proposed simulation approach, in which two energy sub-systems are coupled by compressor and gas-fired generator. Numerical results clearly demonstrate that heterogeneous interactions between electricity and gas systems would trigger the cascading failure propagation between the two coupling systems.

中文翻译：

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电力和天然气集成系统中的级联故障传播仿真

天然气发电机总装机容量的急剧增加，加剧了电力系统与天然气系统之间的动态相互作用，这可能导致级联故障在两个系统之间传播，值得深入研究。考虑到两个系统截然不同的时间响应行为，本文讨论了一种集成仿真方法，用于仿真集成的电力和天然气系统（IEGSs）的级联故障传播过程。一方面，考虑到扰动或故障发生后潮流的瞬时重新分配，采用稳态交流潮流模型。另一方面，气体传输动力学由动力学模型表示，以捕获其过渡过程的细节。两个系统之间的相互作用，研究了能量耦合组件（例如燃气发电机和电动气体压缩机）的强化，以及级联故障传播过程中压缩机运行模式之间的切换。建立了由IEEE 30总线电力系统和14节点15管道燃气系统组成的IEGS，以说明所提出的仿真方法的有效性，该仿真方法通过压缩机和燃气发电机将两个能源子系统耦合在一起。数值结果清楚地表明，电力和天然气系统之间的异质相互作用将触发两个耦合系统之间的级联故障传播。