Robust H-infinity control for the pH Neutralization process based on fuzzy models

pH process has many nonlinear and time varying characteristics so modelling and control of this process is a challenging problem. To deal with the difficulties of the process, Takagi-Sugeno fuzzy approach for describing nonlinear model with several local linear models is proposed in this paper. The parallel distributed compensation method is considered for fuzzy control of overall nonlinear system and a LMI approach has been used for designing H-infinity control of each linear system. Proposed model and controller have been simulated and results show a satisfying performance.