14845

13358

كارشناسي ارشد

كنترل

اصفهان : دانشگاه صنعتي اصفهان

1398

ده، 83ص.: مصور، جدول، نمودار

جعفر قيصري، مرضيه كمالي

يدالله ذاكري

1398/05/09

كتابنامه

مهندسي برق

مهندسي برق و كامپيوتر

1398/05/12

2551226

Compensation of Actuator Saturation Effect on Nonlinear Systems Case Study Superheater System Mohsen Hosseinzade m hosseinzade@ec iut ac ir May 6 2019 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Persian Supervisor Dr Jafar Ghaisari ghaisari@cc iut ac ir Dr Marzieh Kamali m kamali@cc iut ac ir Abstract Actuator is a part of control system that converts the control signal to proper energy for process control Actuatorsaturtion is one of unwanted phenomenon in industrial processes Saturation in process means at least one part of the systemhas its maximum or minimum efficiency and it may cause problems such as unwanted transient response or even unstablityin industrial processes Due to these problems saturation compensation is essential in control systems Saturation occursin both amplitude and rate of actuators So far many methods have been developed to deal with input saturation for linearand nonlinear systems In this thesis the case we have been use to simulate sturation compenstion methods is superheatersystem Superheater is a heater that increase saturated steam temperature and turn it to superheated steam The equations ofsuperheater have been explained One of the common methods to control nonlinear systems is to design the linear controllerfor the linearized model of nonlinear system Nonlinear model linearization have been completed at equilibrium point Someparameters of the superheater model are not known due to intense changes of temperature and pressure in superheater Todesign the controller with this uncertainties an adaptive controller is proposed The model reffrence adaptive controller forlinearized model have been designed To compensate input saturation two methods have been used First an adaptive modelrecovery Anti windup controller designed by adding an extra term to control law Stability and error convergence to zero isproven Another method to compensate the saturation effect is designed to change the adaptive law and useing states of afilter of nominal input and saturated input To design controller for nonlinear model of superheater feedback linearizationmethod is employed Due to uncertainties the control law is adaptive Also backsteping controller is another method usedto design controller for nonlinear model An auxillary system is proposed to compensate the saturation effect stability anderror convergence to zero is proved Key Words Actuator saturation Superheater Adaptive control Feedback linearization SaturationCompensation Back stepping

جعفر قيصري، مرضيه كمالي

يدالله ذاكري