The Experts below are selected from a list of 18141 Experts worldwide ranked by ideXlab platform
X Litrico - One of the best experts on this subject based on the ideXlab platform.
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Simulation Study on the Influence of Roughness on the Downstream Automatic Control of an Irrigation Canal
Journal of Irrigation and Drainage Engineering, 2012Co-Authors: David Lozano, X Litrico, D. Dorchies, Gilles Belaud, Luciano MateosAbstract:AbstractThe controllability of an Irrigation Canal depends on its physical characteristics, on the control algorithm used, and on the actual condition of the Canal in relation to the algorithm tuning conditions. The flow conditions and controllability in an Irrigation Canal may change if the hydraulic friction changes. Great variations in friction were observed in an Irrigation Canal in Spain owing to the presence of Rhizoclonium hieroglyphicum, a type of algae that grows in clear water. Such large variations in friction may have a significant effect on the stability and performance of automatic Canal controllers. Using the unsteady-state model Simulation of Irrigation Canal (SIC), the influence of roughness on the performance of the study Canal under distant downstream control of its four coupled pools was investigated. A set of proportional-integral (PI) controllers was tuned for different values of Manning's n. The controller’s performance under real conditions is sensitive to the roughness conditions ...
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Simulation Study on the Influence of Roughness on the Downstream Automatic Control of an Irrigation Canal
Journal of Irrigation and Drainage Engineering, 2012Co-Authors: David Lozano, X Litrico, D. Dorchies, Gilles Belaud, Lea MateosAbstract:The controllability of an Irrigation Canal depends on its physical characteristics, on the control algorithm used, and on the actual condition of the Canal in relation to the algorithm tuning conditions. The flow conditions and controllability in an Irrigation Canal may change if the hydraulic friction changes. Great variations in friction were observed in an Irrigation Canal in Spain owing to the presence of Rhizoclonium hieroglyphicum, a type of algae that grows in clear water. Such large variations in friction may have a significant effect on the stability and performance of automatic Canal controllers. Using the unsteady-state model Simulation of Irrigation Canal (SIC), the influence of roughness on the performance of the study Canal under distant downstream control of its four coupled pools was investigated. A set of proportional-integral (PI) controllers was tuned for different values of Manning's n. The controller’s performance under real conditions is sensitive to the roughness conditions under which the control gains were tuned, and a method to robustly tune the gains of the PI controllers is proposed.
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Flatness-based control of open-channel flow in an Irrigation Canal using SCADA
IEEE Control Systems Magazine, 2009Co-Authors: Tarek Rabbani, Alexandre M Bayen, S. Munier, D. Dorchies, P.o. Malaterre, X LitricoAbstract:Open channels are used to distribute water to large irrigated areas. In these systems, ensuring timely water delivery is essential to reduce operational water losses. This article derives a method for open-loop control of open channel flow, based on the Hayami model, a parabolic partial differential equation resulting from a simplification of the Saint-Venant equations. The open-loop control is represented as infinite series using differential flatness. Experimental results show the effectiveness of the approach by applying the open-loop controller to a real Irrigation Canal located in South of France.
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Flatness-based control of an Irrigation Canal using SCADA
2009Co-Authors: Tarek Rabbani, Alexandre M Bayen, S. Munier, D. Dorchies, P.o. Malaterre, X LitricoAbstract:With a population of more than six billion people, food production from agriculture must be raised to meet increasing demand. While irrigated agriculture provides 40% of the total food production, it represents 80% of the freshwater consumption worldwide. In summer and drought conditions, efficient management of scarce water resources becomes crucial. The majority of Irrigation Canals are managed manually, however, with large water losses leading to low water efficiency. The present article focuses on the development of algorithms that could contribute to more efficient management of Irrigation Canals that convey water from a source, generally a dam or reservoir located upstream, to water users. We also describe the implementation of an algorithm for real-time Irrigation operations using a supervision, control, and data acquisition (SCADA) system with automatic centralized controller. Irrigation Canals can be viewed and modeled as delay systems since it takes time for the water released at the upstream end to reach the user located downstream. We thus present an openloop controller that can deliver water at a given location at a specified time. The development of this controller requires a method for inverting the equations that describe the dynamics of the Canal in order to parameterize the controlled input as a function of the desired output. The Saint-Venant equations [1] are widely used to describe water discharge in a Canal. Since these equations are not easy to invert, we use a simplified model, called the Hayami model. We use differential flatness to invert the dynamics of the system and to design an open-loop controller.
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Static and Dynamic Data Reconciliation for an Irrigation Canal
Journal of Irrigation and Drainage Engineering, 2008Co-Authors: N. Bedjaoui, X Litrico, J. Ribot-bruno, Damien Koenig, P.o. MalaterreAbstract:This paper deals with the problem of fault detection and isolation in Irrigation Canals. We develop a method which combines static and dynamic data reconciliation for the validation of measurements, detection and isolation of sensors and actuator faults and reconstruction of missing data. Static data reconciliation uses static models at a regulation gate to validate measurements and detect sensor and actuator faults. It also enabled us to detect a drift in the stage discharge rating curve. The dynamic data reconciliation uses additional measurements and a dynamic model of the Canal in order to validate measurements and detect faults and withdrawals. The combination of the two methods allowed us to distinguish between withdrawals and faults. Both methods are evaluated on measurements from a real Irrigation Canal located in the South of France.
Vincent Fromion - One of the best experts on this subject based on the ideXlab platform.
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tuning of robust distant downstream pi controllers for an Irrigation Canal pool i theory
Journal of Irrigation and Drainage Engineering-asce, 2006Co-Authors: X Litrico, Vincent FromionAbstract:The paper proposes a new method to tune robust distant downstream proportional integral (PI) controllers for an Irrigation Canal pool. The method emphasizes the role of gain and phase margins in the controller design, by linking the selection of these robustness indicators to the time domain specifications. This leads to link the frequency domain approach used by automatic control engineers to the time domain approach used by hydraulic engineers. The maximum error corresponding to an unpredicted perturbation is shown to be directly linked to the gain margin and the settling time to the phase margin of the controlled system. The tuning method gives analytical expressions for the controller parameters as function of physical parameters of the Canal pool in order to satisfy desired performance requirements. The model is first expressed in terms of dimensionless variables, in order to get generic tuning formulas. The dimensionless PI coefficients are then expressed as functions of time-domain performance requirements. The PI tuning method is evaluated by simulation on a full nonlinear model for a Canal pool taken from the ASCE test cases.
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H-infinity control of an Irrigation Canal pool with a mixed control politics
IEEE Transactions on Control Systems Technology, 2006Co-Authors: X Litrico, Vincent FromionAbstract:This paper presents a method to design efficient automatic controllers for an Irrigation Canal pool, that realize a compromise between the water resource management and the performance in terms of rejecting unmeasured perturbations. This mixed controller design is casted into the H-infinity optimization framework, and experimentally tested on a real Canal located in Portugal. The experimental results show the effectiveness of the method. We also interpret classical control politics for an Irrigation Canal (local upstream and distant downstream control) using automatic control tools, and show that our method enables to combine both classical politics, keeping the distant downstream control water management while recovering the local upstream control real-time performance with respect to the user.
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H/sub /spl infin// control of an Irrigation Canal pool with a mixed control politics
IEEE Transactions on Control Systems Technology, 2006Co-Authors: X Litrico, Vincent FromionAbstract:This paper presents a method to design efficient automatic controllers for an Irrigation Canal pool, that realize a compromise between the water resource management and the performance in terms of rejecting unmeasured perturbations. This mixed controller design is casted into the H∞ optimization framework, and experimentally tested on a real Canal located in Portugal. The experimental results show the effectiveness of the method. We also interpret classical control politics for an Irrigation Canal (local upstream and distant downstream control) using automatic control tools, and show that our method enables to combine both classical politics, keeping the distant downstream control water management while recovering the local upstream control real-time performance with respect to the user.
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modelling and pi control of an Irrigation Canal
European Control Conference, 2003Co-Authors: X Litrico, Vincent Fromion, J.p. Baume, Manuel RijoAbstract:The main goal of this paper is to expose and validate a methodology to design efficient automatic controllers for Irrigation Canals, based on the Saint-Venant model. This model-based methodology enables to design controllers at the design stage (when the Canal is not already built). The methodology is applied on an experimental Canal located in Portugal. First the full nonlinear PDE model is calibrated, using a single steady-state experiment. The model is then linearized around a functioning point, in order to design linear PI controllers. Two classical control strategies are tested (local upstream control and distant downstream control) and compared on the Canal. The experimental results shows the effectiveness of the method.
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Advanced control politics and optimal performance for an Irrigation Canal
2003 European Control Conference (ECC), 2003Co-Authors: X Litrico, Vincent FromionAbstract:The paper firstly presents the model of an Irrigation Canal, obtained by linearizing Saint-Venant equations around a steady state. Classical control politics for an Irrigation Canal are then interpreted using automatic control tools. The time-delay from upstream discharge to downstream water level induces a limitation in the real-time performance of the controlled system for the so-called distant downstream control, that is not present in the local upstream control. A mixed controller combining distant downstream and local upstream control is proposed. The problem is casted into the H ∞ optimization framework, and experimentally tested on an experimental Canal located in Portugal.
Manuel Rijo - One of the best experts on this subject based on the ideXlab platform.
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simulation of automatic control of an Irrigation Canal
Agricultural Water Management, 2010Co-Authors: David Lozano, Carina Arranja, Manuel Rijo, Luciano MateosAbstract:Improved water management and efficient investment in the modernization of Irrigation schemes are essential measures in many countries to satisfy the increasing demand for water. Automatic control of the main Canals is one method for increasing the efficiency and flexibility of Irrigation systems. In 2005, one Canal in the Irrigation scheme ‘Sector B-XII del Bajo Guadalquivir’ was monitored. This Canal is representative of Irrigation schemes in Southern Spain; it is divided into four pools and supplies an area of 5154 ha. Ultrasonic sensors and pressure transducers were used to record the gate opening and water levels at the upstream and downstream ends of each Canal pool. Using the recorded data and the SIC (Simulation of Irrigation Canals) hydraulic model, two Canal control options (local upstream control and distant downstream control) were evaluated using a PI (Proportional-Integral) control algorithm. First, the SIC model was calibrated and validated under steady-state conditions. Then the proportional and integral gains of the PI algorithm were calibrated. The controllers were tested using theoretical demand changes (constant outflow followed by a sudden demand increase or decrease) and real demand changes generated on the basis of a spatially distributed crop water balance that included a number of sources of variability (random and not random) in the determination of field Irrigation timing and depth. The results obtained show that only the distant downstream controller was able to adjust quickly and automatically the Canal dynamics to the varying water demands; it achieved this efficiently and with few spills at the Canal tail, even when there were sudden and significant flow variations.
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modelling and pi control of an Irrigation Canal
European Control Conference, 2003Co-Authors: X Litrico, Vincent Fromion, J.p. Baume, Manuel RijoAbstract:The main goal of this paper is to expose and validate a methodology to design efficient automatic controllers for Irrigation Canals, based on the Saint-Venant model. This model-based methodology enables to design controllers at the design stage (when the Canal is not already built). The methodology is applied on an experimental Canal located in Portugal. First the full nonlinear PDE model is calibrated, using a single steady-state experiment. The model is then linearized around a functioning point, in order to design linear PI controllers. Two classical control strategies are tested (local upstream control and distant downstream control) and compared on the Canal. The experimental results shows the effectiveness of the method.
R. Rivas Perez - One of the best experts on this subject based on the ideXlab platform.
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smith predictor based robust fractional order control application to water distribution in a main Irrigation Canal pool
Journal of Process Control, 2009Co-Authors: Vicente Feliubatlle, R. Rivas Perez, F Castillo J Garcia, Sanchez L RodriguezAbstract:Abstract This paper proposes a new methodology to design fractional integral controllers combined with Smith predictors, which are robust to high frequency model changes. In particular, special attention is paid to time delay changes. These controllers show also less sensitivity to high frequency measurement noise and disturbances than PI or PID controllers. This methodology is applied to design controllers for water distribution in a main Irrigation Canal pool. Simulated results of standard PI and PID controllers plus a Smith predictor, and the controller developed in this paper are compared when applied to the dynamical model of a real main Irrigation Canal pool showing that our controller exhibits better and more robust features than these. Moreover our controller is compared with other more complex control techniques as predictive control and robust H∞ controllers, exhibiting better or similar performances than these.
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Robust Fractional Order PI Controller for a Main Irrigation Canal Pool
IFAC Proceedings Volumes, 2008Co-Authors: V. Feliu Batlle, R. Rivas Perez, L. Sanchez Rodriguez, F.j. Castillo García, A. Linarez SaezAbstract:Abstract A new method is proposed to design a class of robust fractional order PI controller ( FPI ) based on frequency specifications for water distribution in a main Irrigation Canal pool. The robustness features of the obtained FPI controller are compared with the ones of an equivalent standard PI controller with the same design frequency specifications. A justification of its enhanced properties it is also provided. The interest of such fractional order controllers is justified by the fact that dynamical parameters of main Irrigation Canal pools may change drastically in function of its operation regimes. The designed FPI controller was implemented in a PLC of the Siemens company (Simatic 300) and was installed in a real main Irrigation Canal pool. The real time experimental results carried out comparing both FPI and standard PI controllers for different discharge regimes showed the superiority of the obtained FPI controller over the standard PI controller in terms of time domain performance and robustness. These results proved that the proposed design method leads to an efficient realistic FPI controller for main Irrigation Canal pools.
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System identification for control of a main Irrigation Canal pool
IFAC Proceedings Volumes, 2008Co-Authors: R. Rivas Perez, V. Feliu Batlle, F.j. Castillo García, A. Linarez SaezAbstract:Abstract In this paper, a system identification for control procedure of a main Irrigation Canal pool characterized by exhibiting large variations in their dynamical parameters when it discharge regimes change is developed. This procedure delivers not only a nominal model, but also a reliable estimate of the Canal pool parametric uncertainty associated with the model. The complete identification for control procedure from experiment design to model validation taking into account prior physical information is presented. It is shown that a linear second order model with an ARMAX structure and a time delay describes adequately the main nominal dynamical behavior of this Canal pool. Application of system identification for control in control system design of water distribution in main Irrigation Canal pools responds to the current necessity of introducing more effective and robust control systems.
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FRACTIONAL ROBUST CONTROL TO DELAY CHANGES IN MAIN Irrigation CanalS
IFAC Proceedings Volumes, 2005Co-Authors: V. Feliu Batlle, R. Rivas Perez, F CastilloAbstract:Abstract This paper proposes a new strategy for control of open Irrigation Canals based on fractional order controllers. A methodology is developed to design PI fractional controllers combined with Smith predictors which are robust to changes in the time delay. This method is applied to solve the effective control problem of an open Irrigation Canal. Simulated results of a standard PI controller, PI plus Smith predictor controller, and the controller developed in this paper are compared when applied to the dynamical model of a real Irrigation Canal pool.
Sanchez L Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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smith predictor based robust fractional order control application to water distribution in a main Irrigation Canal pool
Journal of Process Control, 2009Co-Authors: Vicente Feliubatlle, R. Rivas Perez, F Castillo J Garcia, Sanchez L RodriguezAbstract:Abstract This paper proposes a new methodology to design fractional integral controllers combined with Smith predictors, which are robust to high frequency model changes. In particular, special attention is paid to time delay changes. These controllers show also less sensitivity to high frequency measurement noise and disturbances than PI or PID controllers. This methodology is applied to design controllers for water distribution in a main Irrigation Canal pool. Simulated results of standard PI and PID controllers plus a Smith predictor, and the controller developed in this paper are compared when applied to the dynamical model of a real main Irrigation Canal pool showing that our controller exhibits better and more robust features than these. Moreover our controller is compared with other more complex control techniques as predictive control and robust H∞ controllers, exhibiting better or similar performances than these.
