EVALUATION of CONTROL STRATEGIES of PRESSURE of GAS PLANT USING MATLAB Xpc-TARGET

Instrumentation and control engineers are often responsible for the operation of process
control such as chemical and gas processes. As these processes and controllers are
becoming more complex, the role of process automation becomes more and more
important. For the monitoring and controlling of an industrial plant process, a proper
controller needs to be design to achieve a good strategy.
The main objective of this project is to study a plant behavior and to optimize its
performance by simulating it using several types of control strategies.
The first task is to model the pressure plant using an empirical modeling method. The
purpose is to produce the plant transfer function that can be used for pressure controller
analysis. By having the model, there is an alternative way to obtain forecasted data and
result for use in this study.
The second task is to reconstruct a MATLAB / Simulink model. The Simulink model
will be interfaced with the plant via an Xpc Target card to enable real-time analysis of
the control strategies.
The third task is to analyze the model pressure controller performance using different
ways oftuning method. Different tuning techniques give similar but not identical result.
Five tuning method in open loop and three closed loop tuning method are being
compared, namely open loop and closed loop Ziegler - Nicholas, Cohen-Coon, Fertik,
Giancone and Lopez and Tyreus-Luyben and Ziegler-Nichols Bode plot methods are
compared. The tuning methods were analyzed to yield the best result for the control
valve. Finally the data of the PI controller from each of the tuning method is fed into
closed loop Matlab and also to the Simulink Xpc-Target for the real-time analysis and
comparisons ofthe control strategies performance.