The Effect of Design Parameters of an Irrigation Canal on Tuning of Coefficients and Performance of a PI Controller

Abstract

The performance and operation of irrigation networks can be improved using canal automation. This process requires the application of control systems. At the same time, the PI controller has been employed in different areas of the world. However, its adjustment for the different geometric and hydraulic conditions of canals is still considered a major problem for design. The design parameters of a canal such as bottom slope, roughness coefficient and side slope are among the determining factors of water flow dynamic behaviour. In this study, a distant downstream proportional integral feedback control with decouplers is designed for a base canal. By changing the value of design parameters in this canal, their effects on water flow behaviour and controller tuning were investigated. Canal characteristics were determined through a system identification process, and were also used to tune the controller. To simulate the control algorithms and evaluate their performance, a link of the SOBEK model and MATLAB software were used. To evaluate the performance of a well‐tuned controller during a given operation period, the maximum absolute error, integral of absolute magnitude of error and steady‐state error indicators were used. Generally, the result showed the bottom slope to have the most effect on water flow behaviour and tuning of the control algorithm. The effect of the roughness coefficient on the control algorithm and its performance is also more noticeable than the side slope. Copyright © 2015 John Wiley & Sons, Ltd.

Developing Internal and External Proportional Integral Derivative Water Surface Controller in HEC-RAS

“…was combined [28]. There are many other studies regarding the employment of the proportional-integral-derivative controller for regulating water levels in open channel systems and water tanks [29][30][31][32][33][34][35][36].…”

“…A proportional-integral-derivative controller with a conventional model-free adaptive controller (MFAC) to develop a modified model-free adaptive controller (MMFAC) to enhance the control performance of the proportional-integral-derivative controller and MFAC in regulating the water level of a reservoir through rate adjustments was combined [28]. There are many other studies regarding the employment of the proportionalintegral-derivative controller for regulating water levels in open channel systems and water tanks [29][30][31][32][33][34][35][36].…”

Design of PI Controllers for Irrigation Canals Based on Linear Matrix Inequalities

“…It aims to develop a new method to tune PI controllers for irrigation water canals. Nowadays, it is difficult to tune these parameters, mainly in distributed systems [21,22], and thus many methods for PI engineering tuning have been provided, based on various control theories [23][24][25]. For example in [26], the Auto-Tune Variation method is presented and applied to the Gignac Canal (France).…”

“…In [32], multiple-model optimization is used to robustify local PI controllers applied in series with filters in the West main canal of the Dez irrigation system (Iran). In [21], a distant downstream PI feedback control with decouplers is designed and tuned using the canal parameters of its case study. In [33], the PI controller parameters are analytically obtained as a function of the physical parameters of some pools in the ASCE Test Cases.…”

Linear Quadratic Optimal Controller Design for Constant Downstream Water-Level PI Feedback Control of Open-Canal Systems

“…Proportional-integral (PI) feedback algorithm is an important issue in canal control algorithms due to the extensive applicability, high robustness and good performance, but tuning of PI parameters is challenging. Over the past few decades, researchers have put forward many methods to get suitable controller parameters K p and T i [8][9][10][11][12][13][14][15][16][17]. Typically, for practical engineering, the mainly used methods are divided into two kinds: engineering tuning method and trial method.…”