Control of water distribution networks with dynamic DMA topology using strictly feasible sequential convex programming

The operation of water distribution networks (WDN) with a dynamic topology is a recently pioneered approach for the advanced management of District Metered Areas (DMAs) that integrates novel developments in hydraulic modeling, monitoring, optimization, and control. A common practice for leakage mana...

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Published in:	Water resources research Vol. 51; no. 12; pp. 9925 - 9941
Main Authors:	Wright, Robert, Abraham, Edo, Parpas, Panos, Stoianov, Ivan
Format:	Journal Article
Language:	English
Published:	Washington Blackwell Publishing Ltd 01.12.2015 John Wiley & Sons, Inc
Subjects:	dynamic topology flow modulation Hydraulics Optimization pressure management Topology Valves Water distribution water distribution networks
ISSN:	0043-1397, 1944-7973
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Abstract	The operation of water distribution networks (WDN) with a dynamic topology is a recently pioneered approach for the advanced management of District Metered Areas (DMAs) that integrates novel developments in hydraulic modeling, monitoring, optimization, and control. A common practice for leakage management is the sectorization of WDNs into small zones, called DMAs, by permanently closing isolation valves. This facilitates water companies to identify bursts and estimate leakage levels by measuring the inlet flow for each DMA. However, by permanently closing valves, a number of problems have been created including reduced resilience to failure and suboptimal pressure management. By introducing a dynamic topology to these zones, these disadvantages can be eliminated while still retaining the DMA structure for leakage monitoring. In this paper, a novel optimization method based on sequential convex programming (SCP) is outlined for the control of a dynamic topology with the objective of reducing average zone pressure (AZP). A key attribute for control optimization is reliable convergence. To achieve this, the SCP method we propose guarantees that each optimization step is strictly feasible, resulting in improved convergence properties. By using a null space algorithm for hydraulic analyses, the computations required are also significantly reduced. The optimized control is actuated on a real WDN operated with a dynamic topology. This unique experimental program incorporates a number of technologies set up with the objective of investigating pioneering developments in WDN management. Preliminary results indicate AZP reductions for a dynamic topology of up to 6.5% over optimally controlled fixed topology DMAs. Key Points: A novel approach for the operation of water distribution networks A novel optimization method with reliable convergence for valve control Hydraulic data demonstrating the optimization method and operations approach
AbstractList	The operation of water distribution networks (WDN) with a dynamic topology is a recently pioneered approach for the advanced management of District Metered Areas (DMAs) that integrates novel developments in hydraulic modeling, monitoring, optimization, and control. A common practice for leakage management is the sectorization of WDNs into small zones, called DMAs, by permanently closing isolation valves. This facilitates water companies to identify bursts and estimate leakage levels by measuring the inlet flow for each DMA. However, by permanently closing valves, a number of problems have been created including reduced resilience to failure and suboptimal pressure management. By introducing a dynamic topology to these zones, these disadvantages can be eliminated while still retaining the DMA structure for leakage monitoring. In this paper, a novel optimization method based on sequential convex programming (SCP) is outlined for the control of a dynamic topology with the objective of reducing average zone pressure (AZP). A key attribute for control optimization is reliable convergence. To achieve this, the SCP method we propose guarantees that each optimization step is strictly feasible, resulting in improved convergence properties. By using a null space algorithm for hydraulic analyses, the computations required are also significantly reduced. The optimized control is actuated on a real WDN operated with a dynamic topology. This unique experimental program incorporates a number of technologies set up with the objective of investigating pioneering developments in WDN management. Preliminary results indicate AZP reductions for a dynamic topology of up to 6.5% over optimally controlled fixed topology DMAs. A novel approach for the operation of water distribution networks A novel optimization method with reliable convergence for valve control Hydraulic data demonstrating the optimization method and operations approach The operation of water distribution networks (WDN) with a dynamic topology is a recently pioneered approach for the advanced management of District Metered Areas (DMAs) that integrates novel developments in hydraulic modeling, monitoring, optimization, and control. A common practice for leakage management is the sectorization of WDNs into small zones, called DMAs, by permanently closing isolation valves. This facilitates water companies to identify bursts and estimate leakage levels by measuring the inlet flow for each DMA. However, by permanently closing valves, a number of problems have been created including reduced resilience to failure and suboptimal pressure management. By introducing a dynamic topology to these zones, these disadvantages can be eliminated while still retaining the DMA structure for leakage monitoring. In this paper, a novel optimization method based on sequential convex programming (SCP) is outlined for the control of a dynamic topology with the objective of reducing average zone pressure (AZP). A key attribute for control optimization is reliable convergence. To achieve this, the SCP method we propose guarantees that each optimization step is strictly feasible, resulting in improved convergence properties. By using a null space algorithm for hydraulic analyses, the computations required are also significantly reduced. The optimized control is actuated on a real WDN operated with a dynamic topology. This unique experimental program incorporates a number of technologies set up with the objective of investigating pioneering developments in WDN management. Preliminary results indicate AZP reductions for a dynamic topology of up to 6.5% over optimally controlled fixed topology DMAs. Key Points: A novel approach for the operation of water distribution networks A novel optimization method with reliable convergence for valve control Hydraulic data demonstrating the optimization method and operations approach The operation of water distribution networks (WDN) with a dynamic topology is a recently pioneered approach for the advanced management of District Metered Areas (DMAs) that integrates novel developments in hydraulic modeling, monitoring, optimization, and control. A common practice for leakage management is the sectorization of WDNs into small zones, called DMAs, by permanently closing isolation valves. This facilitates water companies to identify bursts and estimate leakage levels by measuring the inlet flow for each DMA. However, by permanently closing valves, a number of problems have been created including reduced resilience to failure and suboptimal pressure management. By introducing a dynamic topology to these zones, these disadvantages can be eliminated while still retaining the DMA structure for leakage monitoring. In this paper, a novel optimization method based on sequential convex programming (SCP) is outlined for the control of a dynamic topology with the objective of reducing average zone pressure (AZP). A key attribute for control optimization is reliable convergence. To achieve this, the SCP method we propose guarantees that each optimization step is strictly feasible, resulting in improved convergence properties. By using a null space algorithm for hydraulic analyses, the computations required are also significantly reduced. The optimized control is actuated on a real WDN operated with a dynamic topology. This unique experimental program incorporates a number of technologies set up with the objective of investigating pioneering developments in WDN management. Preliminary results indicate AZP reductions for a dynamic topology of up to 6.5% over optimally controlled fixed topology DMAs. The operation of water distribution networks (WDN) with a dynamic topology is a recently pioneered approach for the advanced management of District Metered Areas (DMAs) that integrates novel developments in hydraulic modeling, monitoring, optimization, and control. A common practice for leakage management is the sectorization of WDNs into small zones, called DMAs, by permanently closing isolation valves. This facilitates water companies to identify bursts and estimate leakage levels by measuring the inlet flow for each DMA. However, by permanently closing valves, a number of problems have been created including reduced resilience to failure and suboptimal pressure management. By introducing a dynamic topology to these zones, these disadvantages can be eliminated while still retaining the DMA structure for leakage monitoring. In this paper, a novel optimization method based on sequential convex programming (SCP) is outlined for the control of a dynamic topology with the objective of reducing average zone pressure (AZP). A key attribute for control optimization is reliable convergence. To achieve this, the SCP method we propose guarantees that each optimization step is strictly feasible, resulting in improved convergence properties. By using a null space algorithm for hydraulic analyses, the computations required are also significantly reduced. The optimized control is actuated on a real WDN operated with a dynamic topology. This unique experimental program incorporates a number of technologies set up with the objective of investigating pioneering developments in WDN management. Preliminary results indicate AZP reductions for a dynamic topology of up to 6.5% over optimally controlled fixed topology DMAs. Key Points: * A novel approach for the operation of water distribution networks * A novel optimization method with reliable convergence for valve control * Hydraulic data demonstrating the optimization method and operations approach
Author	Abraham, Edo Parpas, Panos Stoianov, Ivan Wright, Robert
Author_xml	– sequence: 1 givenname: Robert surname: Wright fullname: Wright, Robert email: robert.wright07@imperial.ac.uk organization: InfraSense Labs, Department of Civil and Environmental Engineering, Imperial College London, London, UK – sequence: 2 givenname: Edo surname: Abraham fullname: Abraham, Edo organization: InfraSense Labs, Department of Civil and Environmental Engineering, Imperial College London, London, UK – sequence: 3 givenname: Panos surname: Parpas fullname: Parpas, Panos organization: Department of Computing, Imperial College London, London, UK – sequence: 4 givenname: Ivan surname: Stoianov fullname: Stoianov, Ivan organization: InfraSense Labs, Department of Civil and Environmental Engineering, Imperial College London, London, UK
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References_xml	– reference: Ni, Q., C. Zillober, and K. Schittkowski (2005), Sequential convex programming methods for solving large topology optimization problems: Implementation and computational results, J. Comput. Math., 23(5), 491. – reference: Nocedal, J., and S. J. Wright (2006), Numerical Optimization, Springer, Springer-Verlag, N. Y. – reference: Ulanicki, B., P. Bounds, J. Rance, and L. Reynolds (2000), Open and closed loop pressure control for leakage reduction, Urban Water, 2(2), 105-114. – reference: Luenberger, D. G., and Y. Ye (2008), Linear and Nonlinear Programming, vol. 116, Springer, USA. – reference: Abraham, E., and I. Stoianov (2015), Sparse null space algorithms for hydraulica analysis of large scale water supply networks, J. Hydraul. Eng., 11(1), 1111. – reference: Bertsekas, D. (1999), Nonlinear Programming, 2nd ed., Athena Sci., Belmont, Mass. – reference: Vairavamoorthy, K., and J. 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Snippet	The operation of water distribution networks (WDN) with a dynamic topology is a recently pioneered approach for the advanced management of District Metered...
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SubjectTerms	dynamic topology flow modulation Hydraulics Optimization pressure management Topology Valves Water distribution water distribution networks
Title	Control of water distribution networks with dynamic DMA topology using strictly feasible sequential convex programming
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