Pressure Regulator for Low Temperature Separation Process

The task of controlling the separation process is formulated, based on pressure regulation by changing the position of the throttle valve. Nonlinear relations describing the process of throttling the gas flow lead to the need to linearize the mathematical model of the process. The linearization process is performed using the MatLab Linear Analysis Points application. The nature of the model's nonlinearity makes it possible to divide the control range into several zones, within which the linearization errors are minimal. Owing to the obtained transfer functions corresponding to the operating points of the control range, a parametric synthesis of the PID controller was carried out, which ensures stable regulation of the set pressure. Adaptation of the regulator to changing flow parameters is ensured by using the principles of table controlling. The tests of the controller based on the SIMATIC S7-1200 PLC were carried out on the existing experimental plant.