Programmable Logic Controller Using Fuzzy Logic for Water Gate Re-Design and Condition Monitoring for Dams

Programmable Logic Controller Using Fuzzy Logic for Water Gate Re-Design and Condition Monitoring for Dams

Copyright: © 2018 |Pages: 56
DOI: 10.4018/978-1-5225-3244-6.ch008

Abstract

The research on gate control work presents the concept of regulating the flow of water by controlling the dam gates or shutters using servo-motors in order to manage the dam water level. Water level control and insufficient water supply are the major challenges at the hydropower company (HDPC). The system at this dam site consists of the outlet works tower with four outlet penstocks that collects water to the main discharge outlet. The automation implements the electronic control system that uses the programmable logic controller (PLC) and the optical level sensors to detect water level. For the new design, the power screw hoist mechanism is used to open and close the gate of weight 600N with the efficiency of 35.4% of the square thread screw. The gate takes 160 seconds to travel a vertical distance of 600mm in its guide, to fully open and close the 400mm penstock diameter. Mat-lab Simulink was used to control the electronic system for stability to avoid vibrations and fluctuation of speed.
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Layout Of The Tower Outlet Works And The Gates

The system used to open and close the gates is a rope and chain mechanism which is operated manually by people on duty according to water level and supply of water needed. Figure 1 it shows the layout of the tower which is at the deepest point of the dam.

Figure 1.

Collection outlet tower at WDC dam

The tower consists of four penstocks inside it that collect water according to its level to the main discharge outlet away from the dam. It is made up of non-permissible concrete which does not allow water to sip into the tower. The flat vertical gates are used to close the water at each penstock, working under its own weight in the wheel guides as shown in Figure 2. In the tower are the ladders used to go down to each and every level where the gate and penstocks are located as shown in Figure 3. There are four level stages which are accessible using this ladder, each penstock has a butterfly valve to open and close the water.

Figure 2.

Rope and chain manual mechanism at Eben dam

Figure 3.

Access ladder down the tower.

Water from the collecting tower is then piped to the irrigation and to the mine. The water that is supplied is raw water at low charging rates. 2000m3 is supplied to the fields for irrigating per month whilst 1000m3 is supplied to the mine for the processes.

Figure 4.

Channelling water to irrigation

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Generation Of Design Concepts

Introduction

The following concepts were generated from the standard specifications and however, paying due regard to copyright violations. Not all of the details are shown in design drawings. It provides with the simple sketches as the idea is to bring out the concept only without comprising on clarity. The notes are also given to as they describe how the design concept operates. The concept selection will be considered using suitable criteria to come up with the most suitable design. The generated concepts are going to be chosen depending on the most important parameters such as it functionality, efficiency, quality, reliability and economic cost.

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