Based On Fuzzy PID Control Of Boiler Drum Water Level Control System

This article first analyzes the impact of the drum water level of the various interfering factors, and drum water level of the dynamic and static analysis features. Introduced the traditional PID control, due to the boiler drum water level control system input regulator has three regular increase of the input uncertainty is very easy to control the deviation caused by the water level. Therefore, this paper two methods to eliminate the water level deviation: auxiliary signal from the elimination method and auxiliary signal cancellation method. The use of auxiliary steam flow signal and water flow rate on the elimination method to eliminate the water level deviation of the boiler drum water level control in accordance with practical requirements, the use of fuzzy PID control, the use of MATLAB simulation toolbox SIMULINK design two-input single-output fuzzy controller on the boiler drum the water level to the next value in a given simulation. Using conventional PID and fuzzy control approach to PIDF drum level, compared to two control strategies of anti-real images, simulation images show that the latter's anti-interference ability and robustness better, can guarantee the stability of the water level, and can effectively solution can not be resolved with conventional PID "false level" problem.Finally, a brief introduction by the drum water level of several measurement methods and about the impact of measurement error, and the elimination method, through on-site example of the drum water level measurement solution to the problem of not allowed to reduce measurement error due to the water level to the negative drum water level impact.