A fuzzy controller with a real-time tuning algorithm and its application to a steam generator water level control

It is nesessary to tunc the fuzzy rules and the scal­ ing factors in real-time control of a large scale system, the steam generator of a nuclear power plant, as it is related to safety and availability of the plant. A novel real-time tuning algorithm of fuzzy controll er based on the scaling factors is proposed and applied to the steam generator water level control system of the nuclear power plant. The new real-time tuning algorithm adopts a variable ref­ erence tuning index for a good system tuning response and an in­ stantaneous system fuzzy performance for scaling factor tuning. For the fuzzy steam generator controller, <m image signal of fe edwater flow error at low power is proposed and pressnre compensation rules and a gain scheduler of fecclwater temperature arc designed also. The fuzzy controller of the steam generator water level is simulated by the proposed method. The simnlation results show that the im­ proved performance of the steam generator ·water level controller by the proposed method.