scholarly journals Modular Feedback Control of Networked Systems by Clustering: A Drinking Water Network Case Study

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 389 ◽  
Author(s):  
José María Maestre ◽  
Francisco Lopez-Rodriguez ◽  
Francisco Javier Muros ◽  
Carlos Ocampo-Martinez
Keyword(s):  
Drinking Water ◽  
Feedback Control ◽  
Large Scale ◽  
Control Strategies ◽  
System Stability ◽  
Linear Matrix ◽  
Water Network ◽  
Common Lyapunov Function ◽  
Network Topologies

This article presents a method based on linear matrix inequalities (LMIs) for designing a modular feedback control law, whose synthesis guarantees the system stability, while switching to different network topologies. Such stability is achieved by means of a common Lyapunov function to all network admissible configurations. Several mechanisms to relieve the computational burden of this methodology in large-scale systems are also presented. To assess its applicability, the modular controller is tested on a real case study, namely the Barcelona drinking water network (DWN), and its performance is compared with that of other control strategies, showing the effectiveness of the proposed approach.

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).

scholarly journals Water demand forecasting for the optimal operation of large-scale drinking water networks: The Barcelona Case Study.

2014 ◽  
Vol 47 (3) ◽  
pp. 10457-10462 ◽  
Author(s):  
Ajay Kumar Sampathirao ◽  
Juan Manuel Grosso ◽  
Pantelis Sopasakis ◽  
Carlos Ocampo-Martinez ◽  
Alberto Bemporad ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Demand ◽  
Large Scale ◽  
Demand Forecasting ◽  
Optimal Operation ◽  
Water Networks ◽  
Water Demand Forecasting

scholarly journals Rabies control in wildlife: the golden jackal (Canis aureus) requests for attention – a case study

2020 ◽  
Vol 24 (2) ◽  
Author(s):  
Péter Kemenszky ◽  
Ferenc Jánoska ◽  
Gábor Nagy ◽  
Ágnes Csivincsik
Keyword(s):  
Paradigm Shift ◽  
Large Scale ◽  
Control Strategies ◽  
Control Programme ◽  
Wild Boar Population ◽  
Research Groups ◽  
Multidisciplinary Research ◽  
Natural Reservoir ◽  
Rabies Control

In Hungary, the rabies control programme with oral bait immunisation of wild carnivores dates back to 1992. Since than, the rules of vaccine placement on bait density has not changed, in spite of drastic expansion of both the carnivore community and the wild boar population in Europe. Though, all these elements of the concerned ecosystem compete for the baits. This case study was based on the accidental finding of vaccine blisters in jackal stomachs during a large-scale investigation on jackals’ feeding ecology. The results showed 3.17% (0.57-10.87%) frequency of bait occurrence in jackal specimens harvested during the vaccination term. This finding contradicted previous reports on high bait uptake rate and rabies seroconversion in golden jackals. These results called the attention the need for paradigm shift in management of diseases maintained in a natural reservoir. In the authors’ opinion, for reassuring result, multidisciplinary research groups should re-evaluate disease control strategies time and again.

Feedback Control of Biomolecular Systems Formed From Droplet-Interface Bilayers

2008 ◽  
Author(s):  
Stephen A. Sarles ◽  
Donald J. Leo
Keyword(s):  
Feedback Control ◽  
Lipid Bilayers ◽  
Lipid Membranes ◽  
Large Scale ◽  
Control Strategies ◽  
Current Control ◽  
New Paradigm ◽  
Biomolecular Systems ◽  
Integral Current ◽  
Feedback Voltage

Applying feedback control strategies to biological materials establishes a new paradigm for creating controlled biomolecular systems. Specifically, current tracking and feedback voltage amplification are demonstrated separately on bilayer lipid membranes (BLMs) formed via the droplet-interface bilayer (DIB) method. Ion channel induced degradation of the bilayer is studied in order to provide a convenient method for causing changes to the bilayer which can be monitored using proportional-integral (PI) feedback voltage control. Alpha-hemolysin (αHL) from Staphylococcus aureus was shown to cause large scale reductions (+90%) to the resistance of the lipid bilayers formed at the interface of connected water droplets within 90 minutes of bilayer formation. Feedback integral current control was demonstrated on pure 1,2-diphytanoyl-sn-glycero-3-phosphocholine (DPhPC) DIBs not containing αHL and provided accurate current tracking of a 100pA desired current signal driven at a rate of 10mHz and less. Voltage amplification monitoring was achieved on DPhPC DIBs containing αHL, providing a way to detect decreasing resistance and capacitance of the bilayer and nonlinear current-voltage relationship.

scholarly journals Impedance-Based Stability Analysis of Paralleled Grid-Connected Rectifiers: Experimental Case Study in a Data Center

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2109 ◽  
Author(s):  
Henrik Alenius ◽  
Tomi Roinila
Keyword(s):  
Stability Analysis ◽  
Data Center ◽  
Large Scale ◽  
Real Life ◽  
System Stability ◽  
Limited Information ◽  
Impedance Measurements ◽  
Grid Connected Converters ◽  
The Stability

Grid-connected systems often consist of several feedback-controlled power-electronics converters that are connected in parallel. Consequently, a number of stability issues arise due to interactions among multiple converter subsystems. Recent studies have presented impedance-based methods to assess the stability of such large systems. However, only few real-life experiences have been previously presented, and practical implementations of impedance-based analysis are rare for large-scale systems that consist of multiple parallel-connected devices. This work presents a case study in which an unstable high-frequency operation, caused by multiple paralleled grid-connected rectifiers, of a 250 kW data center in southern Finland is reported and studied. In addition, the work presents an experimental approach for characterizing and assessing the system stability by using impedance measurements and an aggregated impedance-based analysis. Recently proposed wideband-identification techniques based on binary injection and Fourier methods are applied to obtain the experimental impedance measurements from the input terminals of a single data center rectifier unit. This work provides a practical approach to design and implement the impedance-based stability analysis for a system consisting of multiple paralleled grid-connected converters. It is shown that the applied methods effectively predict the overall system stability and the resonant modes of the system, even with very limited information on the system. The applied methods are versatile, and can be utilized in various grid-connected applications, for example, in adaptive control, system monitoring, and stability analysis.

Tools to monitor corrosion of cement-containing water mains

2004 ◽  
Vol 49 (2) ◽  
pp. 33-39 ◽  
Author(s):  
P.G.G. Slaats ◽  
G.A.M. Mesman ◽  
L.P.M. Rosenthal ◽  
H. Brink
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Large Scale ◽  
Water Network ◽  
Asbestos Cement ◽  
Water Mains ◽  
Water Companies ◽  
Pipe Replacement ◽  
Non Destructive ◽  
Insight Into

Approximately 40,000 km of the drinking water network in The Netherlands consists of asbestos cement water pipes. The number of fractures in these pipes has increased greatly in recent years. This is due to corrosion of the asbestos cement (AC) which affects the condition of the pipe. Every time a fracture occurs, the question is raised of whether the pipe in question has to be replaced or repaired. A relatively simple destructive technique and non-destructive tests are used on a large scale to assess the condition of the AC pipes in use. Not only is corrosion detrimental to the pipes themselves, it also influences the water quality. Corrosion of the inner walls of cement-containing pipes involves the leaching of hydroxides. This causes pH changes resulting in scaling in water mains and domestic installations. Monitoring techniques have been developed to determine the effects of leaching on water quality. The large-scale use of the relatively simple techniques at water companies increases insight into the condition of the drinking water network, the life expectancy of the pipes and the effects of corrosion on the water quality. Applying these techniques enables those involved to make decisions on pipe replacement and to provide solutions for reducing the effects of leaching.

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