DISTANT DOWNSTREAM CONTROLLER DESIGN FOR IRRIGATION CANALS BASED ON STABILITY MARGINS SPECIFICATIONS
The present work aims at controlling the water level in irrigation canals. This will secure the desired water supply to the farmers and at the same time it will minimize the losses and the cost of operating the irrigation network. A simplified model of an open-canal may be described by the Saint-Venant equations, a system of two nonlinear partial differential equations. For computer simulation purposes, the equations are solved numerically. Then, they are simplified so that the resulting representations retain the basic characteristics of the original system while their form is suitable for control design. In particular, they are linearized about some operating point corresponding to the desired hydraulic conditions and yield, using the Laplace transform, a transfer function. Analysis of this function in the frequency domain, presents facts which help the development of an approximating linear model. This model usually consists of an integrator with time delay. We propose three term (PID) controllers which are suitable for processes corrupted by time delays such as those observed for the water flow in long open-canals. The efficacy of the proposed controllers is illustrated by extensive simulation studies which are performed using the original, nonlinear partial differential equations. This is a necessary step prior to the implementation of an experimental program.
Irrigation canals Saint–Venant equations frequency response PID control
Argyrios G.Soldatos Kostas G.Arvanitis Nick A.Sigrimis
National Technical University of Athens,Dept. of Electrical and Computer Engineering,9 Iroon Polytec Agricultural University of Athens,Dept. of natural Resources management and Agricultural Engineering
国际会议
北京
英文
1-9
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）