University of Twente Student Theses


Control design for a chemical disinfection process using the residence time distribution

Ugryumova, D. (2010) Control design for a chemical disinfection process using the residence time distribution.

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Abstract:The goal of this project is to design a controller for a ultraviolet disinfection system. A disinfection system consists of a tube with a ultraviolet lamp in its center. Some liquid containing bacteria is flowing through the tube. The aim of the controller is to minimize the total energy consumption of the ultraviolet lamp, while keeping the amount of bacteria on the outlet of the system under a given bound. To achieve this goal we derive a model for our system. This model is based on the residence time distribution of the bacteria inside the tube. The result is a bilinear state-space model with a possible time-delay. In this report we compare several methods for identication of the residence time distribution. An algorithm based on system realization theory gives a good estimate. Then, a PID and a LQG controller is designed for the linearized system. The performance of both controllers is tested by implementing them on the bilinear model of the system. For further research we recommend to explore the possibilities of residence time distribution identification using a positive realization theory. Since bacteria concentration are always positive, we are dealing with a positive system. It would also be interesting to design a controller for the bilinear system directly and compare this to the controller designed for the linearized system
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Applied Mathematics MSc (60348)
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