scholarly journals Development of a real-time, near-optimal control process for water-distribution networks

2007 ◽  
Vol 9 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Zhengfu Rao ◽  
Elad Salomons
Keyword(s):  
Optimal Control ◽  
Real Time ◽  
Water Distribution ◽  
Control Process ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Time Step ◽  
Whole Process ◽  
Demand Fluctuations ◽  
Tariff Structure

This paper presents a new approach for the real-time, near-optimal control of water-distribution networks, which forms an integral part of the POWADIMA research project. The process is based on the combined use of an artificial neural network for predicting the consequences of different control settings and a genetic algorithm for selecting the best combination. By this means, it is possible to find the optimal, or at least near-optimal, pump and valve settings for the present time-step as well as those up to a selected operating horizon, taking account of the short-term demand fluctuations, the electricity tariff structure and operational constraints such as minimum delivery pressures, etc. Thereafter, the near-optimal control settings for the present time-step are implemented. Having grounded any discrepancies between the previously predicted and measured storage levels at the next update of the monitoring facilities, the whole process is repeated on a rolling basis and a new operating strategy is computed. Contingency measures for dealing with pump failures, pipe bursts, etc., have also been included. The novelty of this approach is illustrated by the application to a small, hypothetical network. Its relevance to real networks is discussed in the subsequent papers on case studies.

scholarly journals Conceptual design of a generic, real-time, near-optimal control system for water-distribution networks

2007 ◽  
Vol 9 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Derek G Jamieson ◽  
Uri Shamir ◽  
Fernando Martinez ◽  
Marco Franchini
Keyword(s):  
Optimal Control ◽  
Control System ◽  
Real Time ◽  
Time Use ◽  
Water Distribution ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Hydraulic Simulation ◽  
Current State ◽  
Potential Benefits

This paper is intended to serve as an introduction to the POWADIMA research project, whose objective was to determine the feasibility and efficacy of introducing real-time, near-optimal control for water-distribution networks. With that in mind, its contents include the current state-of-the-art and some of the difficulties that would need to be addressed if the goal of near-optimal control was to be achieved. Subsequently, the approach adopted is outlined, together with the reasons for the choice. Since it would be somewhat impractical to use a conventional hydraulic simulation model for real-time, near-optimal control, the methodology includes replicating the model by an artificial neural network which, computationally, is far more efficient. Thereafter, the latter is embedded in a dynamic genetic algorithm, designed specifically for real-time use. In this way, the near-optimal control settings to meet the current demands and minimize the overall pumping costs up to the operating horizon can be derived. The programme of work undertaken in achieving this end is then described. By way of conclusion, the potential benefits arising from implementing the control system developed are briefly reviewed, as are the possibilities of using the same approach for other application areas.

Optimal control of water distribution networks without storage

2020 ◽  
Vol 284 (1) ◽  
pp. 345-354 ◽  
Author(s):  
Dimitrios Nerantzis ◽  
Filippo Pecci ◽  
Ivan Stoianov
Keyword(s):  
Optimal Control ◽  
Water Distribution ◽  
Distribution Networks ◽  
Water Distribution Networks

scholarly journals Real-Time Hydraulic Interval State Estimation for Water Transport Networks: a Case Study

2017 ◽  
Author(s):  
Stelios G. Vrachimis ◽  
Demetrios G. Eliades ◽  
Marios M. Polycarpou
Keyword(s):  
State Estimation ◽  
Real Time ◽  
Water Distribution ◽  
Estimation Error ◽  
Distribution Networks ◽  
Water Levels ◽  
Water Distribution Networks ◽  
Unaccounted For Water ◽  
Tank Water

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 estimate the unaccounted-for water in water distribution networks. As a case study, the method is applied to a transport network in Cyprus, using actual data in real-time.

Real time control of water distribution networks: A state-of-the-art review

2019 ◽  
Vol 161 ◽  
pp. 517-530 ◽  
Author(s):  
E. Creaco ◽  
A. Campisano ◽  
N. Fontana ◽  
G. Marini ◽  
P.R. Page ◽  
...  
Keyword(s):  
Real Time ◽  
Water Distribution ◽  
State Of The Art ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Real Time Control ◽  
Time Control

scholarly journals Small-Scale Hydropower Generation in Water Distribution Networks by Using Pumps as Turbines

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1486
Author(s):  
Francesco Pugliese ◽  
Francesco De Paola ◽  
Nicola Fontana ◽  
Gustavo Marini ◽  
Maurizio Giugni
Keyword(s):  
Water Distribution ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Water Distribution Network ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Small Scale ◽  
Hydropower Generation ◽  
Time Step ◽  
Simulated Time

In this work, a procedure for the optimal design of Pumps As Turbines in Water Distribution Networks was applied, aimed at both maximizing the hydropower generation and exploiting the excess pressure. The design of the main characteristic PAT parameters, namely the flow rate and the head drop at Best Efficiency Point, the rotational speed and the impeller’s diameter was assessed, under the hypothesis of applying the Electrical Regulation. The procedure allowed to estimate both the produced power and the exploited head at any simulated time-step, as well as the overall daily energy, in compliance with the hydraulic and technical constraints of the system. The model was tested on a simplified Water Distribution Network and a preliminary Cost-Benefit analysis was performed, showing interesting reliefs against short Payback Period.

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