Comparative Study On The Control Of PH Neutralization Process

In the last few years,greater use of sophisticated control techniques in the industry processes has been required due to the rising complexity of the processes,performance and quality,and environmental requirements.In contrast,while the industrial processes are typically interested in safety,efficiency,reliability,and modular control systems,they are also interested in adaptable,flexible,resilient,and able to operate on a wide variety of substrates.It is necessary to do ongoing studies on various better controls to address the challenges presented above.Despite advances in process management methodology and implementation over the last several decades,there is still a class of either unregulated or poorly regulated systems.These are processes that react to controls in a very nonlinear manner.Controlling pH is a prime example.One of the most dynamic and studied aspects of pH regulation is high nonlinearity and significant gain,which means several possible responses to each control action.pH control seems to be the standard test-case problem for most of the new control design techniques developed by academics in the process control field.The thesis presents an approach to robust regulation built on the basic idea of active disturbance rejection(ADRC).Its motivation comes from a premise that if a resultant disturbance,defined collectively as discrepancies between the real system and its analytical description,estimation happens in real-time.This can also compensate for model inaccuracy,allowing the final control design more flexible in tolerating vast amounts of uncertainty.It is hoped that the esearch work could provide a significant impact in terms of the development of advanced controller for plant process control applications,especially in terms of the ADRC control approch.The main contents include:1)The model of a pH neutralization process is analyzed,and a PID controller is tuned as the baseline controller for comparison.2)Non-adaptive and adaptive feedback linearization controllers are designed for the pH process—the adaptive controller yields excellent control over a wide range of buffer conditions.3)An active disturbance rejection controller(ADRC)is tuned for the pH neutralization process.Its performance is compared with the performance of the PID controller and the adaptive feedback linearization controller.The simulation study shows that the ADRC controller has strong robustness,quick response,and slight overshoot.