Design of double-fuzzy-integral intelligent water level controller for steam generator

In order to effectively control the water level of steam generator, a double-fuzzy-integral water level controller is designed in this paper. A 'false water level' distinguishing fuzzy controller is added before normal fuzzy controller, to control the water level effectively when SG is in 'false water level' phase. In order to have an optimal water level control, this paper gives the result of fuzzy controller and integral controller export in phase. By the analyzing of control curve, it has validated that the designed double-fuzzy-integral water level controller may overcome the disadvantageous influence given by 'false water level' phenomena to the water level control, and that the control excess adjustment quantity is small and the steady time is short. (authors)