Application of new internal model control in aeration system

In order to solve the problem of dissolved oxygen concentration control caused by strong nonlinearity, large time delay, large time-varying, multivariable coupling and serious uncertainty interference in sewage treatment system, according to the mathematical model of aeration system and blower, combined with the advantages of internal model control and cascade PID control, a two degree of freedom internal model PID control strategy is proposed, and the corresponding sewage treatment aeration control system is designed. This strategy solves the problem that traditional PID control method is difficult to obtain good control effect when the mathematical model of aeration system and blower is not accurate. The simulation experiment is carried out in Matlab / Simulink and compared with other common control methods. The simulation results show that the control system has strong adaptability to the change of working conditions, good tracking and adjusting performance, and has a significant improvement effect on the large time delay control of sewage treatment.