Control Of Delay Systems Research

Time-delay system is the important field for the application of the control theory. In this paper, intelligent control and variable structure control for time-delay system is introduced in order to increase the robustness of the general time-delay control system. Firstly, this paper analyzes the dynamic performance of time-delay, discusses the insufficiency of some general control schemes for time-delay. Smith controller is a kind of compensation control based on plant model, but it is sensitive to the variance of parameter. Fuzzy control does not require accurate plant model, but it can not be directly applied for time-delay system. Therefore, this paper presents some new fuzzy adaptive approaches to time-delay systems, which combines fuzzy control and Smith control. Variable structure control is robust to parameter and external disturbance uncertainty, so state-delay system and input-delay system by variable structure sliding mode control are studied in this paper .The result of simulation shows that the designed fuzzy adaptive controller and sliding mode controller are effective. In the end, the control system and its hardware diagram for steam-gas temperature of boiler in the power plant is designed.