Seismic Reliability Evaluation of City-Level Gas Distribution Networks Using Flow-Based Simulation Modeling
Seismic Reliability Evaluation of City-Level Gas Distribution Networks Using Flow-Based Simulation Modeling
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DOI：
10.1061/9780784482858.043
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Vindhyawasini Prasad;K. Piratla;B. Caswell;Siddhartha Banerjee
中科院分区：
文献类型：
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作者：
Vindhyawasini Prasad;K. Piratla;B. Caswell;Siddhartha Banerjee
与传统化石燃料相比，天然气因其日益增长的可负担性和更低的碳足迹而在全球范围内变得越来越受欢迎。地球仪。它也适用于使用热电联产（CHP）机组的分布式发电。因此，气体分配系统的连续运行至关重要。目前，大部分的燃气管网可靠性评估研究都是基于连通性的指标来评估地震后的管网，本文提出了一种基于流量的城市级燃气管网可靠性量化评估方法。一个代表性的天然气分销网络最初是为城市地区，易于液化设计的。随后研究了设计网络的地震可靠性，其危害等级为Mw=7。在这项研究中使用的可靠性度量是地震事件后立即满足的需求的分数。适当的脆弱性函数的各种组成部分的天然气分销网络已确定从文献中，并用于蒙特-卡罗模拟（MCS）的方法进行可靠性评估。一个计算效率高，基于物理的线性压力模拟（LPA）模型已经开发出来，并用于解决气体分配网络中的稳态流动。这项工作的新奇在于使用LPA模型，该模型将最大限度地减少与MCS中的多次迭代相关的计算工作量，因为它利用了基于物理的气体网络动力学的线性化公式。这项工作提供了一个框架，可用于推进城市级燃气管网的可靠性评估。本文提出的框架可用于改善天然气网络的恢复和重建策略，以提高其在地震期间的性能。
Natural gas is becoming increasingly popular across the globe due to its growing affordability and lower carbon footprint compared conventional fossil fuels. It is also suitable for distributed power generation using combined heat and power (CHP) units. The continuous functioning of a gas distribution system is therefore crucial. Majority of the studies on reliability assessment of gas networks have studied the networks in the aftermath of the earthquake using connectivity-based metrics, while this paper presents a flow-based quantification method to evaluate the reliability of city-level gas distribution networks. A representative gas distribution network is initially designed for an urban area that is prone to liquefaction. Seismic reliability of the designed network is subsequently investigated for a hazard of magnitude Mw=7. The reliability metric used in this study is the fraction of demand satisfied immediately after the seismic event. Appropriate fragility functions for various components of a gas distribution network have been identified from the literature and used in a Monte-Carlo simulation (MCS) approach for reliability assessment. A computationally efficient, physics-based linear-pressure analog (LPA) model has been developed and used to solve the steady-state flows in the gas distribution networks. The novelty of this work lies in the use of LPA model that will minimize the computational effort associated with the numerous iterations in MCS as it leverages linearized formulations of the physics-based gas network dynamics. This work provides a framework which can be used to advance the reliability assessment of city-level gas distribution networks. The framework presented in this paper can be used to improve restoration and rehabilitation strategies for gas networks in order to enhance their performance during earthquakes.