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Robustness Assessment of Hetero-Functional Graph Theory Based Model of Interdependent Urban Utility Networks

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Document pages: 22 pages

Abstract: The increasing urban population imposes a substantial and growing burden onthe supporting infrastructure, such as electricity, water, heating, naturalgas, road transportation, etc. This paper presents a Hetero-functional graphtheory (HFGT) based modeling framework for these integrated infrastructuresfollowed by an analysis of network robustness. The supporting infrastructuresalong with the infrastructure repair facilities are considered. In contrast toconventional graph representations, a weighted HFGT model is used to capturethe system processes and mutual dependencies among resources. To assessrobustness of the inter-dependent networks, impacts of complete partial andrandom targeted attacks are quantified. Specifically, various contingencyscenarios are simulated and the vulnerability of the network is evaluated.Additionally, several robustness metrics are proposed to provide acomprehensive evaluation of system robustness. The proposed weighted HFGTmodeling and robustness assessment approach is tested using a syntheticinterdependent network, comprising of an electrical power system, a waternetwork, a district heating network, a natural gas system and a roadtransportation network. Results demonstrate that system robustness can beenhanced via securing system information and mitigating attack strength.

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