Otimização multiobjetivo da operação de sistemas de distribuição de água com bombas de rotação variável
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2017-09-29
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Universidade Federal de Goiás
Resumo
Faced with urban population growth and the importance of water as a limited natural resource,
there is a need to implement techniques to reduce the operational costs of water distribution
systems and ensure adequate supply. The optimization of pump operation can be used to meet
the demands of consumption with a lower energy cost, in addition to maximizing hydraulic
reliability. In this work, a hybrid optimization / simulation model was developed based on the
multiobjective genetic algorithms and the EPANET hydraulic simulator. The NSGA II (Nondominated
Sorting Genetic Algorithm II) method was used to optimize the operation of variable
rotation pumps, that is, the decision variables of the problem were the rotation of the pumps for
each hour throughout the day. A modification of the original EPANET hydraulic simulator,
which does not correctly compute the efficiency of variable-speed pumps, was employed so
that the power of each pump, and consequently the cost of electric power, was calculated
correctly. The representation of the system in the model was done by means of the configuration
of the hypothetical network called ANYTOWN in the EPANET and implementation of the
Multiobjective Evolutionary Algorithm, determination of the penalty coefficients and
determination of genetic parameters and operators (population, generation number, mutation
probability and probability of recombination). The validity test of the developed model was
obtained through simulations performed with the input data, including the patterns of variation
of the speed of rotation of the pumps. Non-dominated solutions (Pareto Front) were obtained
considering first the negative pressure penalty at the nodes and, subsequently, the negative
pressure penalties at the nodes and the closure / shutdown of tubes and / or pumps. All points
found represent optimal operating solutions for the system considering the period of the last 24
hours for calculating the objective functions. The results obtained for the two previously defined
objectives demonstrate the effectiveness of the model, since mainly with adoption of penalty 2,
presents adequate pressures at the nodes and adequate water level in the reservoir, with the
consequent saving of electric energy and increased hydraulic reliability.
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Citação
SANTOS, L. P. S. Otimização multiobjetivo da operação de sistemas de distribuição de água com bombas de rotação variável. 2017. 122 f. Dissertação (Mestrado em Engenharia Ambiental e Sanitária) - Universidade Federal de Goiás, Goiânia, 2017.