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Irrigation Canal Essay

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Hierarchical PI Control of an Irrigation Canal
Nethravathi C 1, K.P. Shobha2
PG Student [Control & Instrumentation], Dept. of EEE, University Visvesvaraya College of Engineering,
Bengaluru, India1
Assistant professor, Dept. of EEE, University Visvesvaraya College of Engineering, Bengaluru, India2

Abstract – In this paper, it presents the concept of hierarchical PI control of an irrigation canal. Water losses in the irrigation canals are reduced by improving the control system. The water level and inflow to the canal are controlled using gates located along the canals. In this paper we consider the PI controller to control the water level and inflow to the canal. The approach is event driven. The system comprises of water level sensors are …show more content…

It consists of interpreted MATLAB function, rate limiter and a saturation block. Rate limiter controls the rate of change of variable and is used to avoid abrupt change of values that causes transient and jerky operation. It is used to generate a smooth profile waveform while changing from one speed range to another speed range. Saturation is used to limit the waveform range between upper and lower limits. The valve opening command (mA) input is given to the interpreted MATLAB function, which converts the command into flow (mililitre/second). The signal out from MATLAB function is passed through the rate limiter, which generates smooth profile waveform, and then the signal is passed through a saturation block with a gain of 62.1 with the range from 0 to 69.
C. Flow Meter
It converts the canal inflow in millilitre per second into the measured inflow in milli Ampere.
D. Nonlinear Tank Model
It converts the canal inflow (qin in millilitre per second) into water level (h, in centimeter).
E. Level Meter
It converts the water level of the canal, h in centimeter into measured level of the canal in milli Ampere.
V. RESULTS AND

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