Multiple model internal model control based on fuzzy membership function

Considering the characteristics of time delay, time variables and variable operation condition in process control system, The partial models are built based on the different operating points integrating fuzzy membership function with weighted sums to improve the traditional internal model control(IMC), and the fuzzy membership functions are obtained by recursion identification method. Then multiple model internal model control (MM-IMC) based on fuzzy membership function that can realize switching the model smoothly is introduced. The simulated example, the superheated steam temperature control system of power plant, shows that the proposed MM-IMC based on fuzzy membership function design method is superior to the IMC and conventional PID in performance of stability, robustness and response speed, and the method is effective.