Design of Robust PI Controller for Processes with Dead Time Using Gain Margin and Phase Margin

Thirunavukkarasu, I and Mohammed, Emaaduddin and George, V I and Shanmugapriya, S (2013) Design of Robust PI Controller for Processes with Dead Time Using Gain Margin and Phase Margin. In: 6th National Conference on “Advances in Energy Conversion Technologies, February 7-9, 2013, MIT Manipal.

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Process control systems have always played a vital role in industries. With demands rising every now and then, there is a need for equivalent technological advancement. PI/PID controllers have been in use in industries for a long time. This project aims to design a controller to meet the frequency domain specifications like gain margin and phase margin. The approach adopted for this project is called synthesis approach. The synthesis approach stems from the fact that the controller is designed to suit the specifications. The gain margin and phase margin are measures of stability for a feedback system, though often only phase margin is used rather than both. The locus of constant gain margin and constant phase margins are used to determine parameters ‘a’ and ‘b’, which finally lead to determination of Kp and Ki and thus the controller. The PI controller was designed for "First Order plus Time Delay Plants"(FOPTD) and "Second Order plus Time Delay Plants "(SOPTD). For both of these plants the synthesis approach is used. And the controllers are designed to meet the designed specification of either gain margin or phase margin. The result is a breakthrough in the design of PI controllers. The system works for both first and second order and the advantage of reducing higher order systems to these can be done easily. All mathematical derivations and calculations were done using Maple and the plant simulations have been done using Matlab R2011a.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: PID control design, D-curve, phase margin, step response, magnetic levitation
Subjects: Engineering > MIT Manipal > Electrical and Electronics
Engineering > MIT Manipal > Instrumentation and Control
Depositing User: MIT Library
Date Deposited: 16 Feb 2016 11:13
Last Modified: 16 Feb 2016 11:13

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