Research on DO control based on Fuzzy Smith-PID controller for sewage disposal

Considering the characteristics of the time-delay, inertia and time-varying of the dissolved oxygen (DO) control in the sewage disposal process, a Fuzzy Smith-PID control model is proposed based on the analysis of the regular PID and Fuzzy control in this paper, which integrates the advantages of the high robustness of the Fuzzy controller, the compensation of the time delay problem of Smith Estimation Machine and the high accuracy of PID controller. Simulation results show that this complex strategy has good robustness and stability in both of the model matching and mismatching situation, and provides an effective way to solve the problem of the time-delay, inertia and time-varying for sewage disposal system.