Mathematical modelling of a hydraulic controller for PRV flow modulation

AbdelMeguid, Hossam; Skworcow, Piotr; Ulanicki, Bogumił

doi:10.2166/hydro.2011.024

Cited by 20 publications

(8 citation statements)

References 12 publications

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“…A research topic is how to understand and explain the instability phenomena in pressure control schemes for low flow rates (small valve openings) [17]. The results of a mathematical model representing the static and dynamic properties of a hydraulic controller and a PRV show good agreement with experimental data [18]. Optimization models through genetic algorithms are used to minimize leaks in water distribution sites through the most effective location and adjustment of control valves [19].…”

Section: Introductionmentioning

confidence: 98%

Leakage Management and Pipe System Efficiency. Its Influence in the Improvement of the Efficiency Indexes

Ávila

Sánchez-Romero

Jiménez

et al. 2021

Water

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Water is one of the most valuable resources for humans. Worldwide, leakage levels in water distribution systems oscillate between 10% and 55%. This causes the need for constant repairs, economic losses, and risk to the health of users due to possible pathogenic intrusion. There are different methods for estimating the level of leakage in a network, depending on parameters such as service pressure, orifice size, age and pipe material. Sixty-two water distribution networks were analyzed to determine the leakage method used, the calibration method, and the percentage of existing leaks. Different efficiency indicators were proposed and evaluated using this database. Several cases of installation of pumps working as turbines (PATs) in water distribution networks were analyzed in which the use of these recovery systems caused a pressure drop, reducing the level of leaks and recovering energy.

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Section: Introductionmentioning

confidence: 98%

Leakage Management and Pipe System Efficiency. Its Influence in the Improvement of the Efficiency Indexes

Ávila

Sánchez-Romero

Jiménez

et al. 2021

Water

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“…The DPCM worked as a flow modulated PRV, which is also available as integrated medium controlled device, like the AQUAI-MOD ® hydraulic controller (Abdelmeguid et al, 2011). Both the DPCM and medium controlled valves are able to reduce the outlet pressure during low flow, and increase the outlet pressure during higher flows.…”

Section: Static and Flow Modulated Prvs Versus The Dpcmmentioning

confidence: 99%

Advanced control of a water supply system: a case study

Bakker

Rajewicz²,

Kien

et al. 2014

Water Practice and Technology

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Conventional automatic production flow control and pump pressure control of water supply systems are robust and simple: production flow is controlled based on the level in the clear water reservoir and pump pressure is controlled on a static set-point. Recently, more advanced computerbased control methods were developed in which production flow is controlled by using a shortterm water demand forecasting model and pressure is controlled by a dynamic pressure control module. To assess the differences between conventional and advanced control, we examined operational data of water treatment plant (WTP) Gruszczyn that supplies drinking water to a part of the city of Poznań, Poland. We compared two periods of three weeks of conventional and advanced control. The comparison showed that with advanced control the variation in the production flow was 83% lower, and the pump pressure of the clear water pumps was 29% lower.The lower pressure resulted in 20% less background leakage and the overall system's energy costs were 11.5% lower.

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“…This may be undesirable if the intention is to keep the pressures within a DMA at quasi-constant nearoptimal levels. One solution to this problem is to modulate the PRV setpoint as a function of flow, which was done by AbdelMeguid et al (2011) using a special hydraulic device installed in a bypass circuit of a hydraulically operated PRV. Another solution is to manipulate the PRVs based on pressure measurements from within the network using electronic controllers.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sampling on Stability and Performance of Electronically Controlled Pressure-Reducing Valves

Janus

Ulanicki

2021

J. Water Resour. Plann. Manage.

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This paper explains and demonstrates how increasing a sampling period in pressure control may worsen system's performance and may lead to instability. Notion of stability of continuous-time and discrete-time systems is briefly introduced and applied to a simple closed-loop inertial system.It is then demonstrated how stability of dynamic systems depends on a sampling period as well as on gain. Subsequently, the analysis is applied to a model of an electronically controlled pressure reducing valve (PRV) coupled with a transient model of a water distribution network (WDN).Occurrence of instabilities at overly long sampling periods is demonstrated. Practical recommendations on the appropriate choice of sampling times are given based on the simulation results and control engineering rules of thumb given the closed-loop system's dynamics. Performance of a theoretical pressure control scheme is then simulated under time-varying demands and with controllers designed to work at different sampling frequencies.

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Mathematical modelling of a hydraulic controller for PRV flow modulation

Abstract: Key words 9 9 9 9 flow-modulation, hydraulic controller, laboratory test, mathematical model, pressure control, PRV

Cited by 20 publications

References 12 publications

Leakage Management and Pipe System Efficiency. Its Influence in the Improvement of the Efficiency Indexes

Leakage Management and Pipe System Efficiency. Its Influence in the Improvement of the Efficiency Indexes

Advanced control of a water supply system: a case study

Effects of Sampling on Stability and Performance of Electronically Controlled Pressure-Reducing Valves

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