Abstract
Abstract. Hydraulic state estimation in water distribution networks is the task of estimating water flows and pressures in the pipes and nodes of the network based on some sensor measurements. This requires a model of the network as well as knowledge of demand outflow and tank water levels. Due to modeling and measurement uncertainty, standard state estimation may result in inaccurate hydraulic estimates without any measure of the estimation error. This paper describes a methodology for generating hydraulic state bounding estimates based on interval bounds on the parametric and measurement uncertainties. The estimation error bounds provided by this method can be applied to determine the existence of unaccounted-for water in water distribution networks. As a case study, the method is applied to a modified transport network in Cyprus, using actual data in real time.
Highlights
Hydraulic state estimation in water distribution networks (WDNs) is a challenging task due to the presence of modeling uncertainties, such as structural uncertainty introduced by skeletonization of the network, parameter uncertainty of pipe roughness coefficients and uncertainty in water demands
In standard state estimation techniques, statistical characterization of sensor measurement error is needed to give more weight to measurements originating from more accurate sensors
In this work a hydraulic interval state estimation methodology is described and its use is demonstrated with a case study of a modified transport network of a water utility in Cyprus
Summary
Hydraulic state estimation in water distribution networks (WDNs) is a challenging task due to the presence of modeling uncertainties, such as structural uncertainty introduced by skeletonization of the network, parameter uncertainty of pipe roughness coefficients and uncertainty in water demands While this last uncertainty can be reduced by the use of real-time flow measurements, these measurements come with their own instrument uncertainties and noise (Hutton et al, 2014). In this work a hydraulic interval state estimation methodology is described and its use is demonstrated with a case study of a modified transport network of a water utility in Cyprus. Vrachimis et al.: Real-time hydraulic interval state estimation method for determining the existence of unaccounted-for water in the network is presented. The water outflow q1 of the tank is not directly measured
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