Application of fuzzy controller in drum water-level control

This article presents the design of a fuzzy controller embedded in a microcontroller aimed at implementing a low-cost, modular process control system. The fuzzy system's construction is based on a classical proportional and derivative controller, where inputs of error and its derivate depend on the difference between the desired setpoint and the actual level; the goal is to control the water level of coupled tanks. The process is oriented to control based on the knowledge that facilitates the adjustment of the output variable without complex mathematical modeling. In different response tests of the fuzzy controller, a maximum over-impulse greater than 8% or a steady-state error greater than 2.1% was not evidenced when varying the setpoint.

Download Full-text

Fuzzy control and simulation of boiler drum water level

MATEC Web of Conferences ◽

10.1051/matecconf/202030905003 ◽

2020 ◽

Vol 309 ◽

pp. 05003

Author(s):

Fansheng Meng ◽

Xuefei Zhang ◽

Yan Zheng ◽

Xi Cheng ◽

Zhi Weng

Keyword(s):

Control System ◽

Water Level ◽

Pid Control ◽

Control Method ◽

Fuzzy Controller ◽

Control Strategies ◽

Level Control ◽

Level Control System ◽

Boiler Drum ◽

The Subject

Boiler drum water level control system is hard to develop practical mathematical model and has nonlinear, stable and delay characteristics. The traditional boiler drum water level control often uses three impulse PID control method. The existing problem of ordinary PID control strategy is: once good parameter setting, it is hard to adapt to the change of the operation of the system dynamic greatly. In order to solve the problems of the above, the research object of the subject is a certain 120 t/h boiler steam capacity, the boiler drum water level control system is designed, and the control strategies are studied. In order to obtain better contrast, the ordinary PID controller and Fuzzy controller are designed, and the control strategies of the simulation are analyzed.

Download Full-text

The Study of Water Level Fuzzy Control for Supercharged Boiler Drum

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.936.2165 ◽

2014 ◽

Vol 936 ◽

pp. 2165-2170

Author(s):

Hong Yan Zhang ◽

Xiang Dong Jin ◽

Hai Tao Xie

Keyword(s):

Water Level ◽

Pid Controller ◽

Fuzzy Controller ◽

Fuzzy Theory ◽

State Level ◽

Level Control ◽

Steam Power ◽

Steam Power System ◽

Disturbance Response ◽

Boiler Drum

Based on the application of the fuzzy theory,we designed a state level fuzzy controller for the marine steam power system. Compared with the level PID controller and a single-stage cascade PID level controller about disturbance response, the state level controller is more suitable for marine supercharged boiler level control because of its Smaller overshoot, shorter settling time, and other characteristics.

Download Full-text