Real-Time Multiobjective Optimization of Operation of Water Supply Systems

Odan, Frederico Keizo; Reis, Luisa Fernanda Ribeiro; Kapelan, Zoran

doi:10.1061/(asce)wr.1943-5452.0000515

Cited by 61 publications

(21 citation statements)

References 35 publications

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“…For instance, the OWF formulation for variable speed pumps in [21], [17] can not be used for fixed-speed pumps. Although there is an ongoing transition towards variable-speed pumps, the conventional WDS have a fleet of fixed-speed pumps which give way to on/off and implicit flow control [9], [20], [14]. Thus, this work considers fixed-speed pumps.…”

Section: Water Network Modelingmentioning

confidence: 99%

Optimal Scheduling of Water Distribution Systems

Singh

Kekatos

2020

IEEE Trans. Control Netw. Syst.

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With dynamic electricity pricing, the operation of water distribution systems (WDS) is expected to become more variable. The pumps moving water from reservoirs to tanks and consumers can serve as energy storage alternatives if properly operated. Nevertheless, the optimal scheduling of WDS is challenged by the hydraulic law for which the pressure along a pipe drops proportionally to its squared water flow. The optimal water flow (OWF) task is formulated here as a mixed-integer non-convex problem incorporating flow and pressure constraints, critical for the operation of fixed-speed pumps, tanks, reservoirs, and pipes. The hydraulic constraints of the OWF problem are subsequently relaxed to second-order cone constraints, and a penalty term is appended to its objective to promote solutions feasible for the water network. The modified problem can be solved as a mixed-integer second-order cone program, which is analytically shown to yield WDS-feasible minimizers under certain sufficient conditions. By weighting the penalty in the objective of the relaxed problem, its minimizers can attain arbitrarily small optimality gaps, thus providing OWF solutions. Numerical tests using real-world demands and prices on benchmark systems demonstrate the relaxation to be exact for several cases, including setups where the sufficient conditions are not met.Index Terms-Water flow equations, convex relaxation, secondorder cone constraints, optimal water flow.

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Section: Water Network Modelingmentioning

confidence: 99%

Optimal Scheduling of Water Distribution Systems

Singh

Kekatos

2020

IEEE Trans. Control Netw. Syst.

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“…A multi-objective approach has been increasingly applied ( Figure 1) to pump optimisation problems to include considerations other than costs. Other objectives considered, apart from demand charge and pump maintenance costs mentioned above, were the difference between initial and final water levels in storage tanks (Baran et al 2005;Sotelo and Baran 2001), the quantity of pumped water (Kougias and Theodossiou 2013), greenhouse gas (GHG) emissions associated with pump operations (Stokes et al 2015a,b) and operational reliability (Odan et al 2015). Most recently, water quality has been traded off against pump operating costs (Arai et al 2013;Kurek and Ostfeld 2013;Kurek and Ostfeld 2014;Mala-Jetmarova et al 2014) with the finding that those objectives are conflicting.…”

Section: Pump Operationmentioning

confidence: 99%

Lost in optimisation of water distribution systems? A literature review of system operation

Mala-Jetmarova

Sultanova

Savić

2017

Environmental Modelling & Software

233

114

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Optimisation of the operation of water distribution systems has been an active research field for almost half a century. It has focused mainly on optimal pump operation to minimise pumping costs and optimal water quality management to ensure that standards at customer nodes are met. This paper provides a systematic review by bringing together over two hundred publications from the past three decades, which are relevant to operational optimisation of water distribution systems, particularly optimal pump operation, valve control and system operation for water quality purposes of both urban drinking and regional multiquality water distribution systems. Uniquely, it also contains substantial and thorough information for over one hundred publications in a tabular form, which lists optimisation models inclusive of objectives, constraints, decision variables, solution methodologies used and other details. Research challenges in terms of simulation models, optimisation model formulation, selection of optimisation method and postprocessing needs have also been identified.

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“…Minimização dos custos de reabilitação da infraestrutura, minimização dos custos operacionais e minimização dos custos das válvulas redutoras de pressão Odan et al (2015) Algoritmos genéticos 2…”

Section: Modelos De Otimização Multiobjetivounclassified

Eficiência Hidroenergética Em Sistemas De Distribuição De Água: Uma Discussão Teórica

Santos¹,

Soares²,

Silva³

2016

Anais Do XIV Encontro Nacional De Estudantes De Engenharia Ambiental

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Resumo: Grande parte do consumo de energia elétrica dos sistemas de abastecimento de água é proveniente do bombeamento, sendo que as companhias repassam esses gastos ao consumidor a fim de equilibrar as contas. Considerando-se a importância que a eletricidade representa para o saneamento e o quanto as companhias de abastecimento de água gastam com energia elétrica, verifica-se que a melhoria da eficiência beneficia todas as partes envolvidas. Dessa forma é necessário utilizar técnicas de otimização, como modelagem matemática e simuladores hidráulicos, a fim de aumentar a eficiência e reduzir perdas de água. A eficiência global de um sistema depende da capacidade de adequação às necessidades de bombeamento. Para isso, a opção pela solução ideal decorre de análises de funcionamento tanto para situações atuais quanto para situações futuras. Portanto, o projetista deve verificar se será viável ou não utilizar variadores de frequência, escolher diâmetro favorável das tubulações a fim de minimizar vazamentos, analisar o material mais apropriado das tubulações, dimensionar adequadamente os reservatórios e analisar se associação de bombas é favorável para o projeto. A presente pesquisa tem o objetivo de discutir sobre a identificação de fatores que afetam a eficiência hidroenergética no bombeamento, abordar as principais técnicas de otimização, destacar alguns modelos de otimização multiobjetivo e critérios utilizados para seleção adequada.Palavras-chave: Eficiência energética, Abastecimento de água, Bombeamento, Otimização.

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Real-Time Multiobjective Optimization of Operation of Water Supply Systems

Cited by 61 publications

References 35 publications

Optimal Scheduling of Water Distribution Systems

Optimal Scheduling of Water Distribution Systems

Lost in optimisation of water distribution systems? A literature review of system operation

Eficiência Hidroenergética Em Sistemas De Distribuição De Água: Uma Discussão Teórica

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