scholarly journals Relevance of hydraulic modelling in planning and operating real-time pressure control: case of Oppegård municipality

2017 ◽  
Vol 20 (3) ◽  
pp. 535-550 ◽  
Author(s):  
Luigi Berardi ◽  
Antonietta Simone ◽  
Daniele B. Laucelli ◽  
Rita M. Ugarelli ◽  
Orazio Giustolisi
Keyword(s):  
Real Time ◽  
Information And Communication Technologies ◽  
Water Distribution ◽  
Control Strategies ◽  
Pressure Control ◽  
Distribution Networks ◽  
Support Pressure ◽  
Real Time Control ◽  
The Real ◽  
Time Operation

Abstract Technical best practices recommend pressure control as an effective countermeasure to reduce leakages in water distribution networks (WDNs). Information and communication technologies allow driving pressure reducing valves (PRVs) in real-time based on pressure observed at remote control nodes (remote real-time control – RRTC), going beyond the limitations of classic PRV control (i.e. with target pressure node just downstream of the device). Nowadays, advanced hydraulic models are able to simulate both RRTC-PRVs and classic PRVs accounting for unreported and background leakages as diffused pressure-dependent outflows along pipes. This paper studies how such models are relevant to support pressure control strategies at both planning and operation stages on the real WDN of Oppegård (Norway). The advanced hydraulic model permits demonstration that RRTC-PRVs in place of existing classic PRVs might reduce unreported and background leakages by up to 40%. The same analysis unveils that advanced models provide reliable evaluation of leakage reduction efforts, overcoming the inconsistencies of lumped indexes like the Infrastructure Leakage Index (ILI). Thereafter, the model allows comparison of three strategies for the real-time electric regulation of PRVs in some of the planned scenarios, thus supporting real-time operation of RRTC-PRVs.

scholarly journals Strategies for the electric regulation of pressure control valves

2017 ◽  
Vol 19 (5) ◽  
pp. 621-639 ◽  
Author(s):  
Orazio Giustolisi ◽  
Rita M. Ugarelli ◽  
Luigi Berardi ◽  
Daniele B. Laucelli ◽  
Antonietta Simone
Keyword(s):  
Real Time ◽  
Water Distribution ◽  
Pressure Control ◽  
Distribution Networks ◽  
Real Time Control ◽  
Major Drawback ◽  
Control Valves ◽  
Time Control ◽  
Information And Communication ◽  
Target Pressure

In water distribution networks (WDNs), the classic pressure control valves (PCVs) are mechanical/hydraulic devices aimed at maintaining the target pressure just downstream or upstream of the PCV pipe, namely pressure reduction or sustaining valves. From a modelling standpoint, the major drawback of such local control is that classic PCVs may require target pressure varying over time with the pattern of delivered water because the controlled node is not strategic for the optimal WDN pressure control. Current information and communication technology allows transferring streams of pressure data from any WDN node to the PCV. Thus, remotely real-time control (RRTC) permits real-time electric regulation of PCVs to maintain a fixed target pressure value in strategic critical nodes, resulting in optimal control of pressure and background leakages. This paper shows three strategies for the electric regulation of RRTC PCVs, which use as control variables the shutter opening degree (SD), the valve hydraulic resistance (RES) and the valve head loss (HL). The Apulian network is used to compare the three strategies, while the application on the real Oppegård WDN yields further discussions. Results show that HL and RES strategies outperform SD; constraining the maximum shutter displacement helps SD stability although it still needs calibration.

Bursts Detection in Water Distribution Networks Based on Real-Time State Simulation

2014 ◽  
Vol 1065-1069 ◽  
pp. 1692-1698
Author(s):  
Hui Zhang ◽  
Ting Lin Huang ◽  
Mei Hua Cao ◽  
Jin Lan Xu
Keyword(s):  
Real Time ◽  
Water Distribution ◽  
Distribution Networks ◽  
Least Square ◽  
Ratio Method ◽  
Detection Accuracy ◽  
The Real ◽  
Pipe Burst ◽  
Fuzzy Similarity ◽  
Similarity Ratio

Based on the improved weighted-least-square model and fuzzy similarity ratio method, a methodology is proposed to detect pipe bursts in real-time. When SCADA data is obtained DFP algorithm is used to get the real network state. Then the real values of burst characteristics are computed. And the hypothetical values assuming each pipe as the accident pipe are calculated for comparison. The fuzzy similarity ratio method is used to judge whether there is a pipe burst. If there is, the hypothetical value that is most similar to the real value is the accidental state and the corresponding assumed break is the burst location. According to the methodology a software system is developed with Delphi 7 for verification. The running results of a designed network show that the methodology is reliable and its detection accuracy is over 45%.

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

Real-time control strategies for predenitrification - nitrification activated sludge plants biodegradation control

2001 ◽  
Vol 43 (1) ◽  
pp. 209-216 ◽  
Author(s):  
J. Suescun ◽  
X. Ostolaza ◽  
M. Garcia-Sanz ◽  
E. Ayesa
Keyword(s):  
Real Time ◽  
Pilot Plant ◽  
Control Strategies ◽  
Average Concentration ◽  
Real Time Control ◽  
Dynamic Simulations ◽  
Set Point ◽  
The Real ◽  
Time Dynamic ◽  
Time Control

This paper presents the real-time control strategies developed to regulate both the ammonia and nitrate concentration in the effluent of the new Vitoria WWTP (Spain). Nitrate control aims at the optimal use of the denitrification potential at any moment. For this purpose, the proposed control algorithm continuously adapts the internal recycle flow in order to maintain a desired nitrate set-point in the anoxic zone. Ammonia control aims at maintaining the required average concentration of ammonia in the effluent by manipulating the Dissolved Oxygen (DO) set-point. The control strategies have been based on a hierarchical structure where a high-level or supervisory control selects the set-point of the low-level or conventional controllers. The design of the controllers was carried out using the Quantitative Feedback Theory QFT for the design of robust control systems. Moving average values of some variables have been introduced in order to eliminate the perturbations associated with the daily 24-hour profiles. The controllers have been verified using long-time dynamic simulations based on a mathematical model previously calibrated in pilot plant. Influent load and temperature used in the simulations correspond to the real values measured in the full-scale WWTP during 12 months. The results obtained in the simulations show the good performance and stability of the control strategies independently from external disturbances. A short-time experimental verification of the controllers in pilot plant with real wastewater is also presented.

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