scholarly journals PLIO: a generic tool for real-time operational predictive optimal control of water networks

2011 ◽  
Vol 64 (2) ◽  
pp. 448-459 ◽  
Author(s):  
G. Cembrano ◽  
J. Quevedo ◽  
V. Puig ◽  
R. Pérez ◽  
J. Figueras ◽  
...  
Keyword(s):  
Optimal Control ◽  
Flow Control ◽  
Real Time ◽  
Distribution System ◽  
Control Strategies ◽  
Pressure Control ◽  
Water Networks ◽  
Pressurized Water ◽  
Supply And Distribution ◽  
Future Demands

This paper presents a generic tool, named PLIO, that allows to implement the real-time operational control of water networks. Control strategies are generated using predictive optimal control techniques. This tool allows the flow management in a large water supply and distribution system including reservoirs, open-flow channels for water transport, water treatment plants, pressurized water pipe networks, tanks, flow/pressure control elements and a telemetry/telecontrol system. Predictive optimal control is used to generate flow control strategies from the sources to the consumer areas to meet future demands with appropriate pressure levels, optimizing operational goals such as network safety volumes and flow control stability. PLIO allows to build the network model graphically and then to automatically generate the model equations used by the predictive optimal controller. Additionally, PLIO can work off-line (in simulation) and on-line (in real-time mode). The case study of Santiago-Chile is presented to exemplify the control results obtained using PLIO off-line (in simulation).

Design and Implementation of Bus–Holding Control Strategies with Real-Time Information

2002 ◽  
Vol 1791 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Liping Fu ◽  
Xuhui Yang
Keyword(s):  
Optimal Control ◽  
Real Time ◽  
Simulation Analysis ◽  
Control Strategies ◽  
Control Point ◽  
Location Information ◽  
Control Logic ◽  
Design And Implementation ◽  
New Findings ◽  
Real Time Information

A systematic study is described to address various design and implementation issues associated with the problem of real-time bus holding control. Two holding control models have been investigated. The first model follows the conventional threshold-based control logic that determines holding times on the basis of headway to the preceding bus. The second model makes use of both preceding and following headways in identifying optimal control decisions with the assumption that real-time bus location information is available for estimating future bus arrivals at the control stop. An extensive simulation analysis is performed using a real-fife bus route operated by the Grand River Transit of the region of Waterloo, Ontario. The simulation results have substantiated several conclusions and yielded new findings on various issues such as where to set the control point, how many control points should be used, what is the optimal control strength, and what is the value of real-time location information.

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.

Control Systems for the Activated Sludge Process Part I — Modelling

1989 ◽  
Vol 24 (4) ◽  
pp. 479-496 ◽  
Author(s):  
Zdenko Vitasovic ◽  
John F. Andrews
Keyword(s):  
Activated Sludge ◽  
Distribution System ◽  
Control Strategies ◽  
Integrated Model ◽  
Activated Sludge Process ◽  
Supply And Distribution ◽  
Air Supply ◽  
Pump Station ◽  
And Control ◽  
Liquid Separator

Abstract An integrated dynamic model and control system are presented for the activated sludge process. The integrated model is comprised of separate models for the influent pump station, air supply and distribution system, biological reactor, and solids-liquid separator. The models for the pump station and for the air supply and distribution system were based on those for a full-scale plant, the Sagemont plant, Houston, Texas, and use standard engineering equations. The models for the biological reactor and solids-liquid separator are more research oriented and were obtained primarily from the literature. Predictions using these models are therefore expected to be more qualitative than quantitative. The integrated model will be used in part II of the paper to explore process control strategies by computer simulation.

The Design of Power Supply and Distribution Real-Time Monitoring System Based on PXI Bus for Telemetering System

2012 ◽  
Vol 482-484 ◽  
pp. 1725-1728
Author(s):  
Hong Liang Wang ◽  
Hai Fei Ding ◽  
Jin Qi Wang ◽  
Pan Liu
Keyword(s):  
Real Time ◽  
Power Supply ◽  
Distribution System ◽  
High Efficiency ◽  
Data Interpretation ◽  
Signal Acquisition ◽  
Telemetry System ◽  
Real Time Monitoring ◽  
Automatic Data ◽  
Supply And Distribution

Telemetering power supply and distribution system is an important part of the telemetry system. Arming at a telemetering power supply and distribution system, this paper adopts digital multimeter and multiplex switch based on PXI bus to realize 32-channel power supply and distribution DC voltage signal acquisition, storage, real-time monitoring and analysis, and also automatic data interpretation. The system consists of PXI host, multiplex switch, digital multimeter, interface unit, a control software and so on, which has the advantages of high precision, high efficiency, easy to operate, and has been used successfully in the test of a telemetry system.

scholarly journals Improving water management efficiency by using optimization-based control strategies: the Barcelona case study

2009 ◽  
Vol 9 (5) ◽  
pp. 565-575 ◽  
Author(s):  
C. Ocampo-Martinez ◽  
V. Puig ◽  
G. Cembrano ◽  
R. Creus ◽  
M. Minoves
Keyword(s):  
Drinking Water ◽  
Flow Control ◽  
Large Scale ◽  
Control Strategies ◽  
Management Strategies ◽  
Economic Cost ◽  
Performance Indexes ◽  
Future Demands ◽  
Control Stability

This paper describes the application of model-based predictive control (MPC) techniques to the flow management in large-scale drinking water networks including a telemetry/telecontrol system. MPC technique is used to generate flow control strategies from the sources to the consumer areas to meet future demands, optimizing performance indexes associated to operational goals such as economic cost, network safety volumes and flow control stability. The designed management strategies are applied to a real case study based on a representative model of the drinking water network of Barcelona (Spain).

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