Main Steam Temperature Control Based on Variable Universe Fuzzy Dynamic Matrix Control
Lian Lian
Abstract
The main steam temperature is one of the important parameters that need real-time monitoring in the thermal process, which is directly related to the power generation efficiency and operation safety of the boiler. The main steam temperature is also one of the most difficult parameters to control because of its large inertia and nonlinearity. Based on the Fuzzy-DMC controller, the variable universe fuzzy dynamic matrix control (VU Fuzzy-DMC) controller is designed by introducing the idea of variable universe. By adjusting the scaling factor, the universe can be contracted or expanded with the error decreasing or increasing, so as to improve the adaptive ability and control accuracy of the fuzzy controller. The simulation results show that in the case of model matching and model mismatching1, the variable universe VU Fuzzy-DMC controller has better control effect than PID-, DMC- and Fuzzy-DMC-control, greatly reduces the temperature overshoot and regulation time, and the system has strong robustness. The variable universe Fuzzy-DMC controller can quickly return to the set value with small overshoot after being disturbed, and the system has a good anti-interference performance. The designed control strategy is effective.