Against the problems of drum water level in utility boilers

such as nonlinearity and false water level

large overshoot

slow response speed and poor anti-interference ability of the control system during operation

a fuzzy inference based model reference self-adapting internal model control(IMC)method was proposed.By combining the fuzzy control with the IMC

this method uses the relative arithmetic to design the IM controller.It regulates the fuzzy adjusting PID parameters online according to the deviation e and its changing rate ec between the reference model output and the object's actual output.Moreover

on the basis of the Simulink platform

numerical simulation was performed to verify this drum water level control system using the above method.At last

the results were compared with that controlled by the internal model PID.The results show that

the fuzzy PID based model reference self-adaptive IMC has stronger self-adaptability

anti-interference ability and better robustness

which can guarantee the stability of the water level better.