Non-fragile robust control of aeration process of sewagetreatment

The concentration of dissolved of wastewater treatment process directly affect organic removal efficiency and activated sludge. Dissolved oxygen aeration device is through the control of aeration device. In practical application, such as controller was due to the convert accuracy of D/A and A/D ,as well as the truncation errors due to temperature change aging or failure caused by components of electronic components such as the change of the parameters of the influence of various factors, which requires the aeration process control controller gain coefficient must be able to overcome some degree of perturbation, namely the controller design requirements should be certain of non-fragile. Based on the study of the characteristics of aeration process, the stability of the closed-loop system with controller gain perturbation problem is proposed based on the LMI fragile state feedback controller design method, given the sufficient condition of the stability of the closed-loop system when controller with gain perturbed .And given non-fragile of the controller design forms and the solving method. Simulation results show that the gain perturbation controller has strong robustness, which shows that this method is correct and effective.