Model based compensator for control valve

Valve positioner is one of the process element which improves the performance of the control valve. The objective of the valve positioner is to maintain the valve position accurately. The positioner is fitted to the yoke of the actuator and is linked to the spindle of the actuator by a feedback arm in order to monitor valve position. Four basic types of valve positioners are pneumatic, electronic, electro-pneumatic, and digital. This project proposes a method to implement a model based controllers for a pneumatic actuator in order to control the valve position. This model based controllers will be substituted instead of valve positioner. The advanced controllers like internal model controller and smith predictor are proposed for the controller design. The proposed method is tested using Matlab Simulink. A cascaded structure of model based Controller was developed. The model of the control valve is included in the secondary loop and the primary loop consists of the process model. It is observed that the cascaded IMC provides better performance than other controllers.