seminar: Modelling and control issues for irrigation channel networks. A review of classical and new methods
speaker: Xavier Litrico (Cemagref)abstract: Irrigation represents more than 80% of world fresh water consumption, and most of the irrigation systems use open-channels to convey water from the resource to the users. Open-channel irrigation canals are distributed systems with complex dynamics. Automatic control of such systems may dramatically increase water efficiency, which is critical for such a precious resource.
This talk will present methods developed at Cemagref Montpellier, France, for modelling and control of irrigation canals. These methods are based on a mecanistic model of the canal (Saint-Venant equations), using the set of sensors and actuators, to provide tools for real-time control. These tools have been validated on a real canal (Gignac canal), located close to Montpellier.
The modelling of the system is first studied with frequency domain methods. Simple models have been developed to account for the delay in the boundary controlled hyperbolic equations. These models capture the main physical characteristics of the system, while keeping a simple structure. They are directly related to the physical characteristics of the system (geometry, slope, friction, flow, water level).
The series structure of irrigation canals can be used to design mutlivariable controllers based on the aggregation of decentralized monovariable controllers. Classical upstream and downstream control strategies are first studied in terms of stability, performance and robustness. Second, a new structured mixed control scheme is proposed, leading to a fully multivariable controller, with guaranteed stability. This controller enables to mix the advantages of both classical control politics: it recovers the local upstream control performance with respect to unpredicted withdrawals, while at the same time ensuring that the water resource is efficiently managed, as in the downstream control case. It can be implemented in a semi-decentralized way, so that each localized controller only communicates with its closest neighbors. It provides an interesting framework for general design of multivariable controllers for irrigation canals.
timetable:
Fri 6 Apr, 16:30 - 17:00, Aula Dini
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