Robust PID controller for controlling desired level of coupled tank system

Mustaffi, Mohd Hasif Hamzi (2021) Robust PID controller for controlling desired level of coupled tank system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Coupled Tank System (CTS) is mostly used as the operational tools to store and transfer the liquid in the chemical industries. The performance control of the water level in the CTS is a vital aspect to be encountered to ensure the industries or company's production are in good phase. Thus, a suitable control system needs to be implemented in the CTS. The objectives of this project are to study the PID tuning techniques in terms of their performance of rise time (Tr), peak time (Tp), settling time (Ts) and the percentage of overshoot (%OS). Besides this project also aims to determine the best tuning technique in the PID controller to control the liquid level of CTS. Lastly, to observe the effectiveness of the optimal PID controller under various input tracking (robustness) for CTS. Four conventional techniques of PID tuning method such as Ziegler-Nichols (Z-N), Cohen-Coon (C-C), Trial and Error (T-E), and Auto Tuning (A-T) are chosen for CTS. For the Z-N and C-C methods, a manual calculation is implemented to obtain the parameter value for the PID controller. For the optrimization technique, Particle Swarm Optimization (PSO) algorithm is chosen as the PID parameters searcher. The CTS system is simulated by using the MATLAB/Simulink software. The robustness of the system is also tested by applying the various input of water level. As a results, PSO method is found to be the best tuning method among the tuning techniques.

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