DESIGNING OF TWO LEVEL FUZZY ROBUST SELF-TUNING PID CONTROLLERS FOR SUPERHEA TED STEAM TEMPERATURE CONTROL

In industrial process control systems, parameters and structures of their object models could be changed in wide ranges or included some uncertainties. The paper discussed the questions about designing gain scheme type fuzzy self-tuning PID robust controllers. And the two level fuzzy PID controllers with recognition of object feature parameters are proposed. A series of simulation working on a practical system shows these controllers can adapt the object model larger changes, hold better dynamic adjusting performance and have stronger robustness