Abstract
AbstractThis article presents a simple method of designing a fractional filter PID controller for second order plus time delay (SOPTD) processes using internal model control (IMC) scheme. There has been limited number of tuning rules for SOPTD processes developed using direct synthesis method and IMC method. The proposed IMC-PID controller using fractional IMC filter results in a controller structure composed of PID controller cascaded with fractional filter. Simulations have been performed on several second order lag dominant and delay significant processes. Robustness checks are performed for variations in the process parameters and robustness analysis is carried out using sensitivity functions. The proposed controller results in an enhanced control performance for nominal process parameters and with parameter variations. In addition, the effect of measurement noise is also studied for set point tracking and load disturbance variations.
Highlights
Proportional Integral Derivative (PID) controller has been the main choice for industrial sector applications from centuries
Several second order plus time delay (SOPTD) processes representing lag dominant and balanced/delay significant process dynamics are considered for simulation
The performance metrics used for comparison are: integral of square error (ISE), integral of absolute error (IAE), percentage overshoot (%OS) and maximum sensitivity (Ms)
Summary
Proportional Integral Derivative (PID) controller has been the main choice for industrial sector applications from centuries. In spite of the advancements in control, PID controller is still being used by 90% of the applications due to its ability to control wide range of industrial processes R. Ranganayakulu is a PhD candidate in the Department of Chemical Engineering of National Institute of Technology Warangal, India. G. Uday Bhaskar Babu has been working as an assistant professor in the Department of Chemical Engineering of National Institute of Technology Warangal, India. Uday Bhaskar Babu has been working as an assistant professor in the Department of Chemical Engineering of National Institute of Technology Warangal, India He received his PhD degree from IIT Kharagpur in Chemical Engineering. His research interests include Fractional order PID, Model based control, Modeling and Simulation, Nonlinear Control and Process Intensification
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