Disturbance Rejection Analysis For Wastewater Treatment Plant

Briyatharsini, Ramu (2018) Disturbance Rejection Analysis For Wastewater Treatment Plant. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Wastewater Treatment Plant is an important system need to be implemented nowadays as the level of water pollution is at peak because of different kind of activities. Efficiency and performance of a plant always need to be excellent so that the effluent discharging from the plant is meeting the quality requirement of contaminant free water. Thus implementing a good controller that can control the system performance is necessary for best performance. In this project a Proportional Integral Derivative (PID) controller which commonly used in industries is used as feedback controller. There are two kind of PID controllers used which are Davison and Penttinen-Koivo. Feedback controllers will affect the output response before eliminating the error. Thus for prevention and better performances purpose, an observer is integrated with PID controller to reject the disturbance present in the plant before the output performance become undesirable. The closed loop performance of both Davison and Penttinen-Koivo with observer was analysed to compare the performance. It can be observed that Penttinen-Koivo controller with the observer shows better results in rejecting the high level of oscillation as well as the overshoot that exist in the plant compared to Davison controller with observer. With the observer, the injected constant value which act as disturbance can be rejected and the system able to be tracked back to the desired condition.

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