Research of secondary constant pressure water supply system based on fuzzy-PID controller

Water supply system has characteristics of non-linear, time-varying parameter, large time delay, so its mathematical model changes time by time. Water supply system widely use PID controller to keep constant pressure and PID controller need accurate mathematical model. The system that use PID controller is along with large overshoot, more adjusting time. Fuzzy controller don't need the accurate mathematical model. In this paper, water supply system use fuzzy controller on-line adjust the PID controller parameters. Simulation was made under the situation of step response and the pulsed interference by Matlab/Simulink. Comparison was made between PID controller and fuzzy-PID controller. The result shows that fuzzy-PID controller has stronger robustness and better control effect.