Global optimality bounds for the placement of control valves in water supply networks

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Title: Global optimality bounds for the placement of control valves in water supply networks
Authors: Pecci, F
Abraham, E
Stoianov, I
Item Type: Journal Article
Publication Date: 2018-11-28
Abstract: This manuscript investigates the problem of optimal placement of control valves in water supply networks, where the objective is to minimize average zone pressure. The problem formulation results in a nonconvex mixed integer nonlinear program (MINLP). Due to its complex mathematical structure, previous literature has solved this nonconvex MINLP using heuristics or local optimization methods, which do not provide guarantees on the global optimality of the computed valve configurations. In our approach, we implement a branch and bound method to obtain certified bounds on the optimality gap of the solutions. The algorithm relies on the solution of mixed integer linear programs, whose formulations include linear relaxations of the nonconvex hydraulic constraints. We investigate the implementation and performance of different linear relaxation schemes. In addition, a tailored domain reduction procedure is implemented to tighten the relaxations. The developed methods are evaluated using two benchmark water supply networks and an operational water supply network from the UK. The proposed approaches are shown to outperform state-of-the-art global optimization solvers for the considered benchmark water supply networks. The branch and bound algorithm converges to good quality feasible solutions in most instances, with bounds on the optimality gap that are comparable to the level of parameter uncertainty usually experienced in water supply network models.
Issue Date: 28-Nov-2018
Date of Acceptance: 19-Nov-2018
ISSN: 1389-4420
Publisher: Springer Verlag
Start Page: 1
End Page: 39
Journal / Book Title: Optimization and Engineering
Copyright Statement: © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Sponsor/Funder: NEC Corporation
Engineering & Physical Science Research Council (E
Funder's Grant Number: N/A
Keywords: 01 Mathematical Sciences
09 Engineering
Operations Research
Publication Status: Published online
Open Access location: 2018-11-28
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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