Analysis Of The Performance Of PI Controller For Multivariable Plant

Mohd Nafi, Siti Natrah (2018) Analysis Of The Performance Of PI Controller For Multivariable Plant. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The wastewater treatment plant (WWTP) is one of the multivariable plants and classified as a complex system due to its nonlinear dynamics, large uncertainty in the disturbance inputs and multivariable structure. A precise control in biological processes for all the operating conditions is necessary in order to guarantee adequate biological conditions for microorganisms to oxidize the organic materials. The project is aimed to develop a nonlinear PI controller to control substrate (S) and dissolve oxygen (DO) concentration level. However, difficulties come in handling the interactions between different loops that are usually required for an iterative cycle that typically create the changes in parameters, therefore the optimal treated water is challenging to be obtained. To overcome the manual trial and error method is by implementing PSO technique; hence a suitable nonlinear gain function can be achieved with minimal parameterization tuning. It is found that with proper tuning of nonlinear PI controller gain using the PSO algorithm, the tracking response of substrate level and dissolve oxygen is well improved.

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