Application Of PID Control Technique Based On Parameter Fuzzy Self-modify In Natural Gas Pressure Control System

Because the algorithm of the conventional PID controller is simple and can improve the systematic dynamic characteristic and the steady characteristic, it is widely applied to many types of industrial control system. But while carrying on the natural gas pressure control, the systematic parameter is changed according to the change of the environment and the influence of some other detectable factors. The parameter of conventional PID controller is often exactly designed to a kind of situation and is invariable. So the conventional PID controller is very difficult to keep pressure constant. Then we design a kind of fuzzy adaptive PID controller. In view of the real change of pressure control, we use the fuzzy controller to change the parameter of PID controller in time in order to enable it to adapt to the process with the change of object. Then we can realize the permanent pressure control.In this article,we elaborate the fuzzy control principle in detail. The fuzzy control system mainly includes two parts: the fuzzy control system and peripheral equipment. The main part is fuzzy controller. Then, the design of fuzzy adaptive PID controller is introduced in detail. By using fuzzy control in PID controller, it can apply to more complicated system.We simulate this system in laboratory successfully. The system work stably and operate easily. It can obtain satisfying performance and high stability, following the source well. The time of control improve obviously. It improves the system capacity of resisting disturbance and improves the dynamic performance of system. After a period of practical application, it has obviously obtained the better control characteristic of pressure control compared to the conventional PID controller.