Optimal Planning of Gas Storage In Natural Gas System Considering N-1 Failures of Pipelines

摘要

In natural gas transmission system, maintaining all load nodes, especially the nodes with gas-fired power plants, within their required operational pressure ranges under N-1 failures of pipelines is a challenging problem. In this paper, considering the slow dynamics of gas travelling, the transient model of natural gas network is used to represent the dynamic evolutions of mass flow rates through the branches and pressures at nodes after the occurrence of N-1 failures of pipelines, including the pipeline connecting directly or non-directly with source node. For a specific storage candidate installation site, the determination of its optimal capacity to cope with a specific pipeline failure is formulated as a mixed integer linear programming (MILP) problem. Considering all N-1 pipelines failures and storage candidate installation sites, the optimal planning of gas storage, including its optimal capacity and installation site, is then obtained. A test natural gas network with 25 nodes and 26 branches is established and the effectiveness of the optimal gas storage planning model is demonstrated.