DESIGN OF MODIFIED PID CONTROLLER FOR NON-LINEAR SYSTEM

Abstract

In this dissertation rstly conventional PID controllers are discussed thenafter design of modi ed controllers are proposed. Magnetic Levitation system which is highly unstable is converted to linear system. The design of Modifed PID controller for simplifed Magnetic Levitation System and DC servo system are presented . This comprehensive controller satisfy all the objectives. This report focuses on design of Modifed PID controller, design for linearised model of magnetic levitation system as the step response of the system which is highly unstable, DC servo system model and design of modi ed PID controller of both the system. The stable response of the magnetic levitation system system is designed using root locus method and bode plot method by phase lead controllers. In addition to this, modifed PID controller for the system is designed and implemented in Matlab which shows satisfactory result. In this report, study of a non-linear system-magnetic levitation system is done along with its mathematical modeling in both non-linear and linear forms. The linear model is used to design a modi ed PI-D controller for e cient operation of the system. The analyses of the system, both in open-loop and closed-loop con gurations, are done in Matlab & Simulink environment. The controllers so designed are also applied on a real-time experimental setup and the convergence of the